Oki Switch BISM2 User Manual

BISM2 Bluetooth™ Version 2.0 Serial Module  
1. General Description  
Ezurio’s BISM2 Bluetooth Serial Module is a fully integrated and qualified Class 1 Bluetooth solution  
designed for lowest cost of integration and ownership for designers wishing to incorporate Bluetooth  
functionality into their products. The module is qualified to Bluetooth Version 2.0.  
The BISM2 Bluetooth Serial Module is one of the most compact complete Bluetooth solutions, making  
it ideal to integrate into handheld devices. However a version of the BISM2 module is available that  
retains the same board size, mounting holes and connector as the previous Bluetooth Module from  
Ezurio, allowing users to access the improved radio performance and functionality without the need  
for any pcb modifications.  
The BISM2 Module is based on Cambridge Silicon Radio’s BlueCore 04 chipset. The module contain  
sall of the hardware and firmware for a complete Bluetooth solution, requiring no further components.  
The Module has an integrated, high performance antenna which is matched with the Bluetooth RF and  
baseband circuitry. The firmware integrated into the BC04 chipset implements the higher layer  
Bluetooth protocol stack, up to and including the Generic Access Profile (GAP), Service Discovery  
Profile (SDAP), Serial Port Profile (SPP), Dial Up Networking Profile (DUN), Headset Profile (HSP),  
Hands Free Profile (HFP), File Transfer Profile (FTP) and Audio Gateway. A virtual processor is used  
within the BC04 to implement an AT command processor. This interfaces to the host system over a  
straight forward serial port using an extensive range of AT commands. The AT command set abstracts  
the Bluetooth protocol from the host application, saving many months of programming and  
integration time. It provides extremely short integration times for data oriented cable replacement  
and voice applications. A low cost development system is available for fast product evaluation and  
development.  
An alternative version of firmware is available that provides programming support for multi-point  
applications.  
The Module can be configured so that it can be attached to a ‘dumb’ terminal or attached to a PC or  
PDA for cable replacement applications.  
In addition to the Bluetooth functionality, The BISM2 Module provides access to 9 General I/O lines  
and 2 analogue input and output lines. These can be configured to provide connection to simple  
devices such as switches or LEDs without requiring any external processing. Both the GPIO and ADC  
lines can be accessed either via the wired host UART connection, or remotely over the Bluetooth link.  
The BISM2 module is supplied in a small form factor pcb (22.0mm x 34.0mm x 7.6mm), that  
connects to a main pcb using a 40 way Hirose connector. The interface is compatible with the BISM1  
module. The module includes a high sensitivity, high gain antenna which provides excellent range.  
Typical open field performance provides ranges of over 250 metres at transmit powers of 4mW.  
Support is provided for low power modes that make the BISM2 particularly applicable to battery  
powered installations.  
The BISM2 module is Lead-free and is RoHS compliant and supports an industrial temperature range  
of -40°C to +85°C.  
1.1 Applications  
POS Equipment  
Medical Equipment  
Telematics  
Voice Applications  
Industrial Automation  
Automotive Applications  
Bluetooth is a trademark owned by Bluetooth SIG, Inc., USA, and is licensed to Ezurio Ltd  
Module shown without RF shield  
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3. Functional Block Diagram  
3.1 Connection Diagram  
The Module is equipped with a 40-pin 0.5mm pitch board-to-board connector that connects to the  
application platform.  
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3.2 Pin Descriptions  
The Hirose DF12C board-to-board connector on the module is a 40-pin double-row receptacle.  
The table below defines the pin functions. Note that this pin-out is as viewed from the underside of  
the Module.  
Pin Signal  
No.  
Description  
Pin Signal  
No.  
Description  
1
Analogue 0  
1.8v Max  
2
GPIO1  
I/O for Host.  
I/O for Host  
3
Analogue 1  
SPI_MISO  
SPI_CSB  
SPI_CLK  
GND  
1.8v Max  
4
GPIO2  
5
SPI bus serial O/P  
SPI bus chip select I/P  
SPI bus clock I/P  
6
UART_RI  
UART_DCD  
UART_DSR  
‘Ring’ Input or Output  
Input or Output  
Input  
7
8
9
10  
12  
14  
16  
18  
20  
22  
24  
26  
28  
30  
32  
34  
36  
38  
40  
11  
13  
15  
17  
19  
21  
23  
25  
27  
29  
31  
33  
35  
37  
39  
GPIO3/UART_DTR I/O for Host  
RESET  
Reset I/P *  
GPIO4  
I/O for Host & LED  
GND  
GPIO5  
I/O for Host  
SPI_MOSI  
UART_CTS  
UART_TX  
UART_RTS  
UART_RX  
VCC_3V3  
VCC_5V  
N/C  
SPI bus serial I/P  
Clear to Send I/P  
Transmit Data O/P  
Request to Send O/P  
Receive Data I/P  
3.3V Monitor  
GND  
PCM_CLK  
PCM_IN  
PCM_SYNC  
PCM_OUT  
N/C  
PCM Clock I/P  
PCM Data I/P  
PCM Sync I/P  
PCM Data O/P  
3.6V < VIN < 7.0V  
GND  
USB / RESERVED  
USB / RESERVED  
GND  
Do not connect  
Do not connect  
GPIO6 **  
GPIO7 **  
GPIO8 **  
GPIO9  
I/O for Host  
I/O for Host  
I/O for Host  
I/O for Host  
GND  
N/C  
Notes:  
* The reset circuitry within the BISM Serial Modules now incorporates a brown-out detector within  
the module. Customers migrating from previous modules should check their implementation, as they  
may be able to simplify their external power supply design. The reset line has a fixed 10kOhm pull  
down resistor to ground.  
** Pins 33, 35 and 37 were N/C on BISM1. Pin 39 was a 1V8 monitor. Designers migrating between  
designs should be aware that these are now available as I/O. Default configuration is as an input  
PIO lines can be configured through software to be either inputs or outputs with weak or strong pull-  
ups or pull-downs. At reset, all PIO lines are configured as inputs with weak pull-downs.  
UART_RX, UART_TX, UART_CTS, UART_RTS, UART_RI, UART_DCD and UART_DSR are all 3.3v level  
logic. For example, when RX and TX are idle they will be sitting at 3.3V. Conversely for handshaking  
pins CTS, RTS, RI, DCD, DSR a 0v is treated as an assertion.  
Pin 6 (UART_RI) is active low. It is normally 3.3v. When a remote device initiates a connection, this  
pin goes low. This means that when this pin is converted to RS232 voltage levels it will have the  
correct voltage level for assertion.  
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Pin 8 (UART_DCD) is active low. It is normally 3.3v. When a connection is live this pin is low. This  
means that when this pin is converted to RS232 voltage levels it will have the correct voltage level for  
assertion.  
Pin 10 (UART_DSR) is an input, with active low logic. It should be connected to the DTR output of the  
host. When the BISM2 Module is in high speed mode (See definition for S Register 507), this pin  
should be asserted by the host to ensure that the connection is maintained. A deassertion is taken to  
mean that the connection should be dropped, or an online command mode is being requested.  
Pin 27 (VCC_3V3 monitor) may only be used for monitoring purposes. It must not be used as a  
current source.  
The GPIO pins can be accessed using S Registers 621 to 628. GPIO4 is connected to an LED on the  
module. If these I/O pins are set for input, then the LED will be driven by the host and appropriate  
drive current requirements must be satisfied. A Logic 1 switches on the LED.  
GPIO3 is also used for DTR output (active low). See S Register 552 & 553.  
Analogue 0 and 1 should not exceed 1.8v and S Registers 701 and 702 are used to access them.  
3.3 Electrical Specifications  
3.3.1  
Absolute Maximum ratings  
Absolute maximum ratings for supply voltage and voltages on digital and analogue pins of the Module  
are listed below; exceeding these values will cause permanent damage.  
Parameter  
Min  
0
Max  
100  
3.7  
7
Unit  
mA  
V
Peak current of power supply  
Voltage at digital pins  
Voltage at POWER pin  
-0.3  
3.6  
V
3.3.2  
Recommended Operating Parameters  
3.3.2.1  
Power Supply  
Signal Name  
Vcc  
Pin No  
I/O  
Voltage level  
Comments  
29  
I
3.6V to 7.0V  
Ityp = 30mA  
GND  
11, 15, 18,  
30, 36, 38  
6 Ground terminals to be attached  
in parallel  
VCC_3V3  
27  
O
3.3V typical  
For monitoring only. No current  
source  
3.3.2.2  
RS-232 Interface  
Signal Name  
Pin No  
I/O  
Signal level  
Comments  
VOLmax=0.2V  
VOHmin=2.8V  
UART_TX  
21  
O
VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
UART_RX  
25  
19  
I
I
VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
UART_CTS  
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UART_RTS  
UART_DSR  
23  
10  
O
I
VOLmax=0.2V  
VOHmin=2.8V  
VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
VOLmax=0.2V  
UART_DTR  
UART_RI  
12  
6
O
Shared with GPIO3  
VOHmin=2.8V  
O/P : VOLmax=0.2V  
VOHmin=2.8V  
I or O  
Direction may be programmed.  
I/P : VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
O/P : VOLmax=0.2V  
VOHmin=2.8V  
UART_DCD  
8
I or O  
Direction may be programmed.  
I/P : VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
3.3.2.3  
SPI Bus  
Signal Name  
Pin No  
I/O  
Signal level  
VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
VOLmax=0.2V  
VOHmin=2.8V  
VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
Comments  
SPI_MOSI  
17  
I
Used to reprogram Flash  
SPI_MISO  
SPI_CSB  
5
7
O
I
SPI_CLK  
9
I
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3.3.2.4  
PCM Interface  
Signal Name  
Pin No  
I/O  
Signal level  
O/P : VOLmax=0.2V  
VOHmin=2.8V  
Comments  
PCM_CLK  
20  
I or O  
If unused keep pins open  
I/P : VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
VILmax=0.8V  
PCM_IN  
22  
24  
I
VIHmin=2.1V  
VIHmax=3.7V  
O/P : VOLmax=0.2V  
VOHmin=2.8V  
PCM_SYNC  
I or O  
I/P : VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
VOLmax=0.2V  
VOHmin=2.8V  
PCM_OUT  
26  
O
3.3.2.5  
General Purpose I/O and ADC  
Signal Name  
Pin No  
2,4,12,  
14,16,  
33, 35,  
37, 39  
I/O  
Signal level  
O/P : VOLmax=0.2V  
VOHmin=2.8V  
Comments  
GPIO 1 - 9  
I or O  
I/P : VILmax=0.8V  
VIHmin=2.1V  
VIHmax=3.7V  
Range 0 – 1.8V  
AIO_0, AIO_1  
1, 3  
I
3.3.2.6  
Miscellaneous  
Function  
Signal Name  
Pin No  
I/O  
Signal level  
Comments  
VILmax =0.3vdd_usb  
VIHmin =0.7vdd_usb  
Reserved  
USB D-  
32  
34  
13  
I
Normally inactive.  
Pull to GND  
through 10K  
VILmax =0.3vdd_usb  
VIHmin =0.7vdd_usb  
Reserved  
USB D+  
RESET  
I
I
Normally inactive.  
Pull to GND  
through 10K  
Threshold 2.6V  
Reset  
Active HIGH  
Terminology:  
USB Signal Levels. vdd_usb refers to the internal voltage generated by the LDO regulator on the  
module, which is typically 3.3V. Hence 0.3vdd_usb and 0.7vdd_usb correspond to 1.0V to 2.3V. If  
Vcc falls below the recommended minimum of 3.6V, these values will be reduced.  
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4. I/O Characteristics  
4.1 Power Consumption  
The current drain from the Vcc power input line is dependent on various factors. The three most  
significant factors are the voltage level at Vcc, UART Baudrate and the operating mode.  
The hardware specification for the Module allows for a voltage range of 3.6 to 7.0 at Vcc. Tests have  
shown that there is no significant difference in current draw when Vcc is 5 or 6V. Therefore the data  
presented below, pertains to Vcc levels of 3.6 and 5v only. Tests have shown that where power drain  
is an issue, it is best to keep Vcc at the lower end of the range.  
The UART baudrate has a bearing on power drain because as is normal for digital electronics, the  
power requirements increase linearly with increasing clocking frequencies. Hence higher baudrates  
result in a higher current drain.  
Finally with regards to operating mode the significant modes are; idle, waiting for a connection,  
inquiring, initiating a connection, sniff and connected. With connected mode, it is also relevant to  
differentiate between no data being transferred and when data is being transferred at the maximum  
rate possible. The AT command Set document describes how to configure the Module for optimal  
power performance.  
4.1.1  
Typical Current Consumption in mA  
Baudrate  
38,400 115,200  
9,600  
460,800  
3.00  
Idle Mode, S512=1  
3.6v  
5.0v  
3.6v  
5.0v  
1.60  
1.80  
1.96  
2.00  
2.10  
2.30  
3.40  
Wait for Connection Or Discoverable Mode,  
AT+BTP  
59.00  
65.00  
59.00  
65.00  
59.00  
65.00  
59.00  
65.00  
S508=S510=640, S509=S511=320  
Wait for Connection Or Discoverable Mode,  
AT+BTP  
3.6v  
5.0v  
2.75  
3.26  
2.94  
3.36  
3.10  
3.55  
4.12  
4.63  
S508=S510=1000, S509=S511=11*  
Inquiring Mode, AT+BTI  
3.6v  
5.0v  
3.6v  
5.0v  
3.6v  
5.0v  
3.6v  
5.0v  
50.00  
54.00  
50.00  
54.00  
6.00  
50.00  
54.00  
50.00  
54.00  
6.10  
50.00  
54.00  
50.00  
54.00  
6.40  
50.00  
54.00  
50.00  
54.00  
7.20  
Connecting Mode (ATDxxx)  
Connected Mode (No Data Transfer)  
Connected Mode (Max Data Transfer)  
7.20  
7.20  
7.40  
8.20  
21.50  
24.50  
22.50  
26.00  
24.50  
28.00  
32.50  
36.00  
Notes: These figures were obtained with pre-production firmware. Production values will typically be  
20% lower.  
* Calculated figures  
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5. DC Characteristics  
5.1 RF Performance  
5.1.1  
Transmit Power  
Conducted Transmit Power  
Antenna Gain  
min: 1.0mW (0dBm)  
+2dBi typ.  
max: 4mW (6dBm)  
Max: +6dBm  
Effective Transmit Power  
min:0dBm  
Output power can be reduced by program control  
5.1.2  
Receive Sensitivity  
Receive Sensitivity  
Antenna Gain  
-86dBm (at 25°C)  
+2dBi typ  
Effective Receive Sensitivity  
-88dBm (at 25°C)  
5.1.3  
RF Performance Data  
Receive Sensitivity  
0
-40 deg  
-20 deg  
0 deg  
20 deg  
40 deg  
60 deg  
80 deg  
100 deg  
-10  
-20  
-30  
-40  
-50  
-60  
-70  
-80  
-90  
-100  
NOTE: Measured as attenuation required  
to achieve better than 0.1% BER  
Temperature Deg. C.  
5.2 Range  
See the Data Transfer Rate vs. distance graph below. The data throughput of the Module is limited to  
280Kbps by the parsing of the data being transferred through the RFCOMM stack. The graph below  
shows the typical data throughput. Distances are measured in free space between 2 Modules.  
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Data Transfer Rate / Distance  
800  
700  
600  
500  
400  
300  
200  
100  
0
RF data rate  
Serial port data rate  
10m  
50m  
100m  
150m  
200m  
250m  
300m  
Distance (meters)  
5.3 Temperature Performance  
Data Transmit Rate with Temperature and Attenuation  
800  
700  
600  
500  
400  
300  
200  
100  
0
-40 deg  
-20 deg  
0 deg  
20 deg  
40 deg  
60 deg  
80 deg  
100 deg  
-60dBm  
-65dBm  
-70dBm  
-75dBm  
-80dBm  
-85dBm  
-90dBm  
dBm attenuation  
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6. Functional Description  
The BISM2 Bluetooth module is a self-contained Bluetooth product and requires only power to  
implement full Bluetooth communication. The integrated, high performance antenna together with the  
RF and Base-band circuitry provides the Bluetooth wireless link and the UART interface provides a  
connection to the host system.  
The variety of interfaces and the AT command set allow the BISM2 module to be used for a wide  
number of short range wireless applications, from simple cable replacement to complex multipoint  
applications, where multiple radio links are active at the same time.  
The complexity and flexibility of configuration are made simple for the design engineer by the  
integration of a extremely comprehensive set of AT commands, supplemented with a range of “S”  
registers which are used for non-volatile storage of system parameters. These are fully documented  
in the “Blu2i AT Command Reference Manual”.  
To provide the widest scope for integration a range of different physical host interfaces are provided:  
6.1 Interfaces  
6.1.1  
UART interface  
UART_TX, UART_RX, UART_RTS and UART_CTS form a conventional asynchronous serial data port  
with handshaking. The interface is designed to operate correctly when connected to other UART  
devices such as the 16550A. The signalling levels are nominal 0V and 3.3V and are inverted with  
respect to the signalling on an RS232 cable. The interface is programmable over a variety of bit  
rates; no, even or odd parity; stop bit and hardware flow control. The default condition on power-up  
is pre-assigned in the external Flash. Two-way hardware flow control is implemented by UART_RTS  
and UART_CTS. UART_RTS is an output and is active low. UART_CTS is an input and is active low.  
These signals operate according to normal industry convention.  
By writing different values to the relevant S register the UART_RI can be continuously polled to detect  
incoming communication. The UART_RI signal serves to indicate incoming calls.  
UART_DSR is an active low input. It should be connected to DTR output of the host. When the module  
is running in high speed mode (See definition for S Reg 507), this pin should be asserted by the host  
to ensure connection is maintained. A de-assertion is taken to mean that the connection should be  
dropped, or an online command mode is being requested.  
The module communicates with the customer application using the following signals:  
RS-232  
Port /TXD @ application sends data to the module’s UART_RX signal line  
Port /RXD @ application receives data from the module’s UART_TX signal line  
Serial Module  
UART_TX  
Application  
/RXD  
UART_RX  
/TXD  
/RTS  
/CTS  
/DTR  
/DSR  
/RING  
UART_CTS  
UART_RTS  
UART_DSR  
UART_DTR  
UART_RI  
UART_DCD  
/DCD  
Figure 6.1 : UART interfaces  
Note that the serial module output is at 3.3V CMOS logic levels. Level conversion must be added to  
interface with an RS-232 level compliant interface.  
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6.1.2  
SPI bus  
The Module is a slave device that uses terminals SPI_MOSI, SPI_MISO, SPI_CLK and SPI_CSB. This  
interface is used for program firmware updates at the factory.  
Ezurio supply a PC based utility to allow firmware upgrade over the UART port. It is highly  
recommended that customers should use this method for updating firmware.  
Note: The designer should be aware that no security protection is built into the hardware or firmware  
associated with this port, so the terminals should not be permanently connected in a PC application.  
6.1.3  
GPIO Port  
Eight lines of programmable bi-directional input/outputs (I/O) are provided that can be accessed  
either via the UART port, or Over The Air (OTA) from a second Bluetooth unit. These can be used as  
data inputs or to control external equipment. By using these in OTA mode, a BISM module can be  
used for control and data acquisition without the need for any additional host processor.  
Each of the GPIO[1:8] ports can be independently configured to be either an Input or Output. A  
selection of ports can be accessed synchronously.  
GPIO 1 and 2 can be configured as event counters.  
The ports are powered from VCC. The mode of these lines can be configured and the lines are  
accessed via S Registers 621 to 628.  
Low latency I/O can be accessed by using Ezurio’s I/O via an enhanced inquiry process.  
6.1.4  
PCM CODEC Interface  
PCM_OUT, PCM_IN, PCM_CLK and PCM_SYNC carry up to three bi-directional channels of voice data,  
each at 8ksamples/s. The format of the PCM samples can be 8-bit A-law, 8-bit µ-law, 13-bit linear or  
16-bit linear. The PCM_CLK and PCM_SYNC terminals can be configured as inputs or outputs,  
depending on whether the module is the Master or Slave of the PCM interface. Please contact an  
Ezurio FAE for further details.  
The Module is compatible with the Motorola SSI TM interface and interfaces directly to PCM audio  
devices including the following:  
6.1.4.1  
Compatible Codec Chips  
Winbond W61360 13-bit linear CODEC (Motorola MC145483 compatible)  
OKI MSM7702 single channel A-law and µ-law CODEC  
OKI MSM7705 four channel A-law and µ-law CODEC  
The default codec support is for the Winbond W61360  
Codec development boards that mate with the EZURiO Wireless Developers Kit are available for each  
of the three codecs listed above.  
6.1.5  
ADC  
The BISM2 provides access to two 8-bit ADCs. These provide an input range of 0mV to 1,800mV,  
which can be read using the S registers 701 and 702.  
Suitable external scaling and over-voltage protection should be incorporated in your design. The  
module provides 5 samples per second at the UART with a baud rate of 115200 or above.  
Low latency access of the upper 6 bits of the ADCs can be obtained by using Ezurio’s I/O via an  
enhanced inquiry process.  
6.1.6  
LED  
A single LED provides information on the status of the module. It is controlled by a S register to  
display the status of various parameters and is useful for debug and test.  
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7. Integrated Firmware  
7.1 General  
The BISM2 has been designed to provide the fastest route to market for designers who wish to use  
Bluetooth to wirelessly enable their products. To achieve this Ezurio has implemented a wide ranging  
set of AT commands that control all of the standard Bluetooth tasks. These remove the complexity of  
Bluetooth from the design engineer and allow the wireless link to be controlled by means of a simple  
set of commands.  
For applications where multiple concurrent live connections need to be maintained a variant of  
firmware is available which is specifically targeted at multipoint operation.  
For both applications a comprehensive range of windows based software is available to speed up the  
design process. A low cost development kit is also available that can be used for prototyping both  
cable replacement and multipoint applications.  
7.2 Profiles  
Bluetooth has been designed to accommodate a very wide range of wireless applications. To enable  
these different applications the Bluetooth SIG (Special Interest Group) has defined a series of  
different profiles that define the way in which Bluetooth devices communicate with each other and  
perform basic functions. These provide a base line of interoperability for specific application  
scenarios, upon which more complex user applications can be developed.  
There are over 30 different profiles, many of which have been developed for specific applications.  
The BISM2 firmware is provided with support for the profiles that are most commonly required for  
cable replacement applications.  
The current profiles support includes:  
GAP  
SDP  
Generic Access Profile. The base connection profile upon which others are based.  
Service Discovery Profile. The profile to find other Bluetooth devices and the services  
they support.  
SPP  
Serial Port Profile. Emulation of a serial cable for cable replacement applications.  
DUN  
Dial Up Networking. Profile support for connection to an external PSTN, GSM, GPRS  
or VPN connection.  
Audio Gateway. The base element for Headset and Handsfree profile. A portion of these  
profiles must be implemented within the host system.  
HSP  
Headset Profile. Supports early implementations of headsets. Now largely replaced  
by the:  
HFP  
FTP  
Hands-free profile, which provide more control over the headset operation.  
File Transfer Profile (full client support).  
For other profile support, please contact Ezurio Ltd at [email protected]  
7.3 AT Overview  
The AT command set is well known by engineers and was developed to aid the integration of PSTN  
modems. It provides simple high level commands for complex functions that can easily be  
incorporated into programs or used within programming scripts.  
Ezurio has used this familiar concept and extended it to Bluetooth to simplify the integration of  
Bluetooth for product designers. Rather than having to understand the many stages of setting up a  
Bluetooth connection or function, a single AT command is all that is required.  
For example to connect to a Bluetooth device with an address 00809844EA13, all that is needed is to  
send the string  
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ATD00809844EA13  
to the UART of the BISM2 module. The module will attempt to make a connection and return connect  
00809844ea13,1101) or (NO CARRIER), depending on whether the connection was successful.  
The scope of the AT command set developed by Ezurio is such that most Bluetooth functionality can  
be covered, greatly reducing development time.  
To provide additional functionality a range of “S” registers has been implemented. These allow  
program settings to be stored to control the BISM2 function and also give access to configuring and  
reading ports and status registers within the BISM2.  
Full details of the AT command set are provided in the Blu2i AT Command Reference Manual.  
7.3.1  
AT features at a glance  
7.3.1.1  
General  
Configure two modules to automatically connect and transfer data, audio or a combination of  
data and audio when both devices are powered. The peer device does not have to be another  
Intelligent Serial Module. It is possible to implement auto connect with a Bluetooth enabled  
mobile phone.  
Automatically re-connect devices when a connection is dropped.  
Remotely access the AT parser of the remote unit from a master device to perform Over The  
Air (OTA) configuration.  
Configure the module to enter a state on power up and after a period of time change to  
another state automatically. This allows units to be placed in the discoverable state for a  
limited time period.  
Read and write to GPIO lines  
Read the ADC channels  
Get fast GPIO and ADC status through an inquiry response (patent pending)  
7.3.1.2  
Audio  
Set up audio connections  
Enable / disable Auto Answer for incoming connections  
7.3.1.3  
UART  
Change the baud rate from 1200 to 921,600 baud.  
Use the DSR line to drop connections  
Flexible configuration as either DTE or DCE  
Change escape sequence character  
Change the number of Stop bits and Parity  
Enable or disable echoes  
7.3.1.4  
Security  
Enable Authentication by requiring a PIN code for incoming AND / OR outgoing connections  
Enable data to be encrypted over the air for incoming AND / OR outgoing connections. The  
module can be configured to be:  
non-connectable and non-discoverable,  
non-connectable but discoverable,  
connectable but non-discoverable,  
connectable and discoverable.  
Automatically store Paired devices in a trusted device database in the flash memory  
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7.3.1.5  
Bluetooth  
Set the module to be a master or slave  
Make a Bluetooth connection to a specified device  
Perform a full inquiry for other Bluetooth devices  
Query a remote device to check if a service is offered  
Fetch the friendly name of a remote device  
Increase or decrease the delay before the master abandons a connection attempt  
Change the device class code  
Set the device’s friendly name  
Change the Inquiry scan time  
Change number of returned devices from an inquiry scan  
Obtain the RSSI value for a connection  
7.3.1.6  
Power Management  
Decrease or increase the output power to suit your connection range  
Configure the modules to work in Sniff and other low power modes.  
7.4 Multipoint Firmware  
For multipoint operation, the same hardware can be loaded with multipoint software. Whereas the  
firmware for single point ‘AT’ communication only allows one connection to be active at any one time,  
using multipoint firmware allows a number of simultaneous connections to be made and maintained.  
It also allows connections to multiple profiles to one or more devices. Multipoint firmware should be  
seen as a concept of channels instead of slave connections.  
When operating in Bluetooth multipoint mode, the resources and bandwidth of a Bluetooth master  
device are shared amongst the different connected devices. This has an impact on the maximum  
throughput to any one device. If multiple device connections are maintained it also impacts on the  
memory resources and device database within the Bluetooth stack. Designers should be aware of  
these restrictions when using multipoint configurations. In most cases better latency and power  
consumption can be achieved by polling or fast data transfer rather than by maintaining concurrent  
connections.  
In general, multipoint connections are viable for up to three connections, but other connection  
schemes become appropriate if a greater number of devices are being deployed.  
7.5 OTA (Over the Air) Configuration  
When the BISM2 has its remote AT parser enabled, its settings can be remotely controlled by a  
master unit (see register S536). This places the slave unit’s AT parser in remote mode providing  
over the air configuration. This mode is of use for remote sensor applications, where no host  
processor is required to control the slave Bluetooth unit.  
7.6 Boot modes  
The module has the capability of booting into 1 of 7 modes. Currently only Boot Mode 1 is supported.  
Boot Mode 1 is default and gives functionality equivalent to the BISM1 module.  
These modes will specify different PSKEY settings to allow for different basic operation. Please  
contact Ezurio for further information.  
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8. Low Power Modes  
The current drain from the Vcc power input line is dependent on various factors. The three most  
significant factors are the voltage level at Vcc, UART baud rate and the operating mode.  
The hardware specification for the blu2i module allows for a voltage range of 3.6 to 7.0v at Vcc. Tests  
have shown that there is no significant difference in current draw when Vcc is 5 or 6V.  
The UART baud rate has a bearing on power drain because as is normal for digital electronics, the  
power requirements increase linearly with increasing clocking frequencies. Hence higher baud rates  
result in a higher current drain.  
Finally with regards to operating mode the significant modes are; idle, waiting for a connection,  
inquiring, initiating a connection and connected. With connected mode, it is also relevant to  
differentiate between no data being transferred and when data is being transferred at the maximum  
rate possible.  
The operating mode can best be described by stating the AT commands required to enter that mode.  
In addition, there are certain S Registers which have a direct impact on power consumption, which  
are described next.  
The blu2i Module has a single LED which can be configured to display connection status. Tests have  
shown that this LED can consume up to 5.3mA which is more than double the current draw when in  
Idle mode. S Register 534 can be used to completely disable this indicator.  
S Registers 508 to 511, which specify the page and inquiry scan intervals and windows, can be used  
to adjust the average current drain when in discoverable and or connectable modes. Registers 508  
and 509 specify the interval and window for page scans and registers 510 and 511 specify the  
interval and window for inquiry scans. Register pairs 508/509 and 510/511 describe duty cycles when  
the blu2i module goes into scan modes. It is while scanning that the highest current draw occurs. The  
average current draw is determined by simple arithmetic using the values stored in the 508/509 and  
510/511 register pairs.  
Typical current consumption is given in Section 4.1.  
The current drain while waiting for a connection or discoverable mode is about 30 times higher than  
in idle mode. This is when the page/inquiry scan duty cycle is 100%. These modes give the quickest  
response to a page or inquiry request from a remote peer.  
It is possible to reduce the duty cycle down to as low as 0.5% at the expense of response time. The  
response time can be specified via S Registers 508 and 510 for page and inquiry respectively, where  
the worst case response time can be as high as 2.5 seconds. Then the duty cycle can be varied by  
changing the value of S Registers 509 and 511 appropriately.  
For example, if S Register 508 and 510 are both set to 1000ms and S Register 509 and 511 are both  
set to 11ms then the duty cycle is reduced to 1%, this means that average current drain at 5.0v will  
be 2% of 65mA plus the normal idle mode current, that is, it is as low as 2.75mA. However, in this  
case, it can take up to 1 second to establish a connection.  
The connected state current consumption while a master or slave can be considerably reduced by  
enabling Sniff mode, described in detail in the next section.  
mA  
Current per LED (when fitted)  
3.6V  
5.0V  
3.20  
5.30  
8.1 Low Power Modes using Sniff  
Bluetooth connections are master/slave in nature. A master sends packets and a slave has to  
acknowledge that packet in the next timeslot. Timeslots in Bluetooth are 625 microseconds wide. This  
implies that a master will always know when packets will be sent and received, which further means it  
is able to optimise power usage by switching on power hungry circuitry only when needed.  
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A slave on the other hand does NOT have prior knowledge of when a packet will be received and has  
to assume that a packet will be received from a master on every receive slot. This means that it has  
to leave its receiving circuitry on for most of the receive slot duration. The result of this is high power  
consumption as illustrated in the power table in Section 4.1, where a slave with no data transmission  
still consumes around 31mA whereas a master consumes only 6mA.  
This problem was identified very early in the evolution of Bluetooth (especially since headsets spend  
all their time as a slave in a Bluetooth connection) and it was solved by having a mode called Sniff,  
with appropriate lower layer negotiating protocol.  
Sniff mode during connection is basically an agreement between the slave and its master that data  
packets will only be exchanged for N timeslots every M slots. The slave can then assume that it will  
never be contacted during N-M slots, and so can switch its power hungry circuitry off. The  
specification goes further by also specifying a third parameter called ‘timeout’ (T) which specifies  
‘extra’ timeslots that the slave will agree to listen for after receiving a valid data packet. Put another  
way, if a data packet is received by the slave, then it knows that it MUST carry on listening for at  
least T more slots. If within that T slot time period another data packet is received, then the timer is  
restarted. This mechanism ensures low power consumption when there is no data transfer – at the  
expense of latency. When there is a lot of data to be transferred, it acts as if sniff mode were not  
enabled.  
It is stated above that during sniff mode, a slave listens for N slots every M slots. The Bluetooth  
specification states that a master can have up to 7 slaves attached to it with all slaves having  
requested varying sniff parameters. It may therefore be impossible to guarantee that each slave gets  
the M parameter it requested. In light of this, the protocol for enabling sniff mode specifies that a  
requesting peer specify the M parameter as a minimum and maximum value. This will allow the  
master to interleave the sniff modes for all slaves attached.  
For this reason, the sniff parameters are specified in the BISM2 module via four S registers. S  
Register 561 is used to specify ‘N’, S Register 562 is used to specify ‘T’ and S Registers 563/564 are  
used to specify minimum ‘M’ and maximum ‘M’ respectively. Although the specification defines these  
parameters in terms of timeslots, the S register values have to be specified in units of milliseconds  
and the firmware does the necessary translation to timeslots.  
High Power Consumption  
Low Power Consumption  
T Slots  
T Slots  
T Slots  
T Slots  
T Slots  
N Slots  
N Slots  
N Slots  
M Slots (Negotiated)  
M Slots (Negotiated)  
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9. Application Examples  
9.1 RS232 Modem Signals  
Just as a telephony modem has control and status lines, the blu2i Module also provides for 6 control  
and status lines as per the table below. The direction column is as seen from the module’s viewpoint.  
Direction  
IN or OUT *  
IN or OUT *  
IN  
Function  
CI also known as RI (Ring Indicate)  
DCD (Data Carrier Detect)  
DSR (Data Set ready)  
OUT  
DTR (Data Terminal Ready)  
CTS (Clear to Send)  
IN  
OUT  
RTS (Request to Send)  
* configurable with S register 552  
The first four lines are under program control. These use four of the GPIO pins and are mapped to  
I/O as per the table below. The last two are under control of the UART driver and their functionality is  
always enabled.  
Direction  
IN/OUT  
IN/OUT  
IN/OUT  
IN/OUT  
IN  
Connector Pin Label  
GPIO1  
Function  
General Purpose I/O  
GPIO2  
General Purpose I/O  
UART_RI  
Input/Output from module  
Input/Output from module  
Input to Module  
UART_DCD  
UART_DSR  
GPIO3/UART_DTR  
GPIO4/LED  
GPIO5  
IN/OUT  
IN/OUT  
IN/OUT  
IN/OUT  
IN/OUT  
IN/OUT  
General Purpose I/O (or DTR functionality)  
General Purpose I/O (LED)  
General Purpose I/O  
GPIO6  
General Purpose I/O  
GPIO7  
General Purpose I/O  
GPIO8  
General Purpose I/O  
Notes:  
1.  
PIO4 (DSR) is used by the blu2i module to sense that the host is connected, and is intricately  
linked with connections. For outgoing calls, if this line is not asserted then an error is indicated.  
Similarly for AT+BTP and AT+BTG.  
While in a call, for appropriate modes, a de-assertion means fall into command state. If the de-  
assertion exists for longer than the period specified in S Register 519 then the connection is dropped  
as if an ATH command was received.  
2.  
PIO2 (RI), is normally de-asserted. When an incoming connection is detected it will be  
asserted, until the connection is either answered or rejected using ATA and ATH respectively. See S  
Registers 552 & 553 for more details  
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3.  
PIO3 (DCD) will be de-asserted when the device is in the unconnected state. Asserted when a  
connection is active. See S Registers 552 and 553 for more details.  
4. PIO5 is either used as GPIO or driven as UART_DTR. When the unit is configured in pure host  
mode, this pin is forced into UART_DTR and is asserted when there is a Bluetooth connection.  
GPIO Pins 1 to 8 are available for general purpose use.  
9.2 Modem signalling over Bluetooth  
The RFCOMM protocol used in Bluetooth for implementing the serial port profile allows for the  
exchange of four modem signals. This information is contained in a special transparent message  
which contains bits identified as RTR, RTC, DV and IC which depending on the type of serial device  
being emulated maps to DTR or DSR, RTS, DCD and RI respectively. In addition, this message also  
includes the ability to convey a BREAK input from one end to the other.  
To allow for the greatest flexibility and variability in how the modem control signals are used out in  
the real world, S Registers 551, 552 and 553 have been provided which allow for any of RTR,RTC,DV  
and IC to be mapped to any modem control/status line.  
BREAK signal on RX line  
If the host sends a break signal of duration greater than 100ms, then the blu2i module is  
configured to treat that as a signal to perform a hardware reset.  
This being the case it is not possible to convey a BREAK over Bluetooth to the peer device.  
Reset  
The module can be reset by the host without the need of any I/O using a BREAK signal. The  
module has been configured to reset when the RX line detects a break condition for durations  
greater than 100 milliseconds.  
The Reset line has a fixed pull down resistor of 10kOhm  
9.3 Pure Cable Replacement Mode  
The module has the capability of being preset into a pure 5-wire data cable replacement mode. The 5  
wires being RX, TX, CTS, RTS and GND. This mode requires no changes to a host application since the  
Bluetooth connection is automatically set up on power up. If the connection is lost the BISM2 module  
will constantly retry until the connection is reinstated.  
By implication, two devices are needed to replace a cable. One device is pre-configured to always be  
a master and the other, a slave.  
Assuming the Bluetooth address of the master to be <bdaddr_m> and that of the slave to be  
<bdaddr_s>, the master module is configured by sending it the following AT commands:  
AT&F*  
ATS512=1  
ATS504=1  
ATS507=2  
ATS530=2000  
AT&W  
AT+BTR<bdaddr_s>  
The ATS507=2 setting puts the device in DSR drop mode only. This means that when the device  
needs to be reconfigured, deasserting the DSR line will ensure that the module responds quickly to AT  
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commands. This further means that in stand alone mode, the DSR input line MUST be asserted e.g.  
0V in TTL signal mode.  
The slave is configured by:  
AT&F*  
ATS512=4  
ATS0=-1  
AT&W  
AT+BTR<bdaddr_m>  
Where <bdaddr_m> is optional. If it is not specified, then the slave unit will accept connections from  
any device. If specified then only connections from the device specified will be accepted.  
If it is desired that the slave unit should not be discoverable (the master is by default not  
discoverable), then the configuration commands are:  
AT&F*  
ATS512=3  
ATS0=-1  
AT&W  
AT+BTR<bdaddr_m>  
Where <bdaddr_m> is optional. If it is not specified, then the slave unit will accept connections from  
any device. If specified then only connections from the device specified will be accepted.  
When the units are next power cycled, the slave unit will wait for the master to connect to it and the  
master will continually look for the slave. If a connection attempt fails, the master will wait for 2  
seconds before reattempting a connection. This 2 second delay can be varied by issuing it an ATS530  
command with an appropriate value in the range 100ms to 15000ms.  
IMPORTANT NOTE: The DSR input to the module MUST be asserted for the auto connection to  
succeed. When operating at TTL levels a 0V is seen as an assert state. When operating at RS232  
levels and voltage greater than 3V is seen as assert. It is usual to connect the DTR line of the host to  
the DSR line of this device.  
9.4 Audio Cable (voice)  
With a pair of these modules it is possible to replace a mono audio cable with two way traffic. That is,  
a setup where a microphone is connected to a speaker at the remote end and vice versa. So this  
mode effectively replaces two audio cables.  
Assuming the Bluetooth address of the master to be <bdaddr_m> and that of the slave to be  
<bdaddr_s>, the master module is configured by sending it the following AT commands:  
AT&F*  
ATS512=1  
ATS504=1  
ATS530=2000  
ATS532=7  
AT&W  
AT+BTR<bdaddr_s>  
And the slave is configured by:  
AT&F*  
ATS512=4  
ATS0=-1  
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AT&W  
AT+BTR<bdaddr_m>  
9.5 Modem Control and Status Signals  
A serial port has DTR, DSR, RTS, CTS, DCD and RI control lines. RTS and CTS are locally controlled to  
prevent local buffer overflow.  
The status of DTR, DRS, DCD and RI can be exchanged with the remote peer device. If for example,  
the DTR/DSR lines are to be exchanged between the two peers to simulate the performance of a  
physical cable, then it is possible to do so. Refer to the description for S Registers 551, 552 and 553  
for more details.  
Some serial implementations link CTS and RTS to remove the need for handshaking. Ezurio do not  
recommend linking CTS and RTS other than for testing and prototyping. If these pins are linked and  
the host sends data at the point that the Bluetooth Serial Module deasserts its RTS signal, then there  
is a significant risk that internal receive buffers will overflow which could lead to an internal processor  
crash. This will lead to a drop in connection and may require a power cycle to reset the module.  
Ezurio recommend that the correct CTS/RTS handshaking protocol be adhered to for proper  
operation.  
9.6 Oscillator Output  
The output from the high performance crystal oscillator (+ 10ppm) can be divided and output on one  
of the selected PIO lines, removing the need for a crystal on the customer’s main pcb. The  
frequencies available are:  
8 MHz  
16 MHz  
24 MHz  
48 MHz  
For more implementation details, please contact Ezurio’s FAE team.  
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10. Application Information  
10.1  
Antenna Position  
The antenna used on the BISM2 Bluetooth module is designed to be largely immune from the effects  
of proximity detuning. Normally, antennas operating at 2.4GHz are affected by their surroundings, so  
that great care is needed in their placement and orientation.  
The BISM2 can be used in most locations and orientations and is only marginally affected by the  
presence of a significant ground plane in close proximity.  
The antenna distribution is close to isotropic, which means that the orientation of mounting has only a  
limited effect on the overall range. However the optimum range is achieved when the two antennae  
are directly facing each other  
Example of Radiation Characteristics  
Horizontal Polarisation  
Vertical Polarisation  
Typical Radiation Characteristics. Measured at 2.5metres from a standard dipole.  
The module should not be located in a sealed metal enclosure, as this will act as a Faraday cage and  
severely attenuate the radio signal.  
The antenna finish may tarnish as a result of environmental effects and handling. This is a cosmetic  
effect and does not affect the RF performance.  
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10.2  
Power Supply Considerations  
The power supply for the Module has to be a single voltage source of Vcc within the range of 3.6 V to  
7.0 V. It must be able to provide sufficient current in a transmit burst. This can rise to 65mA.  
The Module includes regulators to provide local 3.3V. This rail is accessible on connector J2 for  
monitoring purposes only. Under no circumstances should this pin be used to source current.  
Power (Vcc) can be provided via the board-to-board connector Pin 29 on J2.  
10.3  
Power-On-Reset (Power Cycling and Brown Out  
considerations).  
The Module is provided with an active high reset pin (Hirose 40way DF12C connector pin 13). Upon  
the application of power, the Power On Reset circuit built into the Module will ensure that the unit  
starts correctly. There is no need for an external power reset monitor.  
Note: The previous version of the Bluetooth Serial Module required an external Brown Out circuit to  
ensure correct operation. This circuitry has now been incorporated into the module. The power  
supply has been designed to work with previous versions of customer circuitry that may or may not  
have external brown-out implementations. Customers migrating from a BISM1 to BISM2 module may  
be able to simplify their power supply circuitry as a result..  
10.4  
RF Shield  
To meet FCC requirements, all modules are supplied with a soldered RF shield. This meets the  
requirement that users may not be able to access RF circuitry without special tools. Removal of the  
shield may negate RF approvals.  
10.5  
Mounting the Module onto the application platform  
There are many ways to properly install the Module in the host device. An efficient approach is to  
mount the PCB to a frame, plate, rack or chassis. Fasteners can be M1.8 or M2 screws plus suitable  
washers, circuit board spacers, or customized screws, clamps, or brackets in 2.2mm diameter holes.  
Note that care should be taken to ensure the head of the fixing does not interfere with the circuit.  
Nylon fixings are recommended. In addition, the board-to-board connection can also be utilized to  
achieve better support.  
The antenna (Brown square component on top side of PCB) must not be influenced by any other  
PCBs, components or by the housing of the host device. The proximity of the antenna to large  
metallic objects can affect the range and performance of the system. Designers should carefully  
consider the location of the Module and the type of enclosure material that is used.  
To prevent mechanical damage, be careful not to force, bend or twist the Module. Be sure it is  
positioned flat against the host device.  
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10.5.1 Fixing Pillars  
Ezurio in conjunction with Richco has designed a mounting pillar for use with the Bluetooth Serial  
Module. This allows the module to be securely held to a primary pcb using snap fit details. A variety  
of different heights are available to accommodate different variants of Hirose stacked connectors.  
Pillars supporting a 3.5mm stacked board height can be supplied by Ezurio. These and alternative  
spacings can also be ordered directly from Richco.  
Customer designs using these pillars should use 2.5mm diameter holes on a 1.6mm thick PCB. in  
conjunction with the 3.6 mm stacked height Hirose if they are to take advantage of this.  
Board Spacing  
Part number  
Source  
Matching HRS PCB  
Socket  
3.6 mm  
NPR2005-153-3.6  
Ezurio / Richco  
CL537-0032-4-86  
4.1 mm  
5.1 mm  
NPR2005-153-4.1  
NPR2005-153-5.1  
Richco  
Richco  
CL537-0057-5-86  
CL537-0157-0-86  
See http://www.hirose.co.jp/cataloge_hp/e53700036.pdf for detail information on the PCB socket.  
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11. Board to Board Connector  
This chapter provides specifications for the 40-pin board-to-board connector which serves as physical  
interface to the host application. The receptacle assembled on the Module is Hirose type DF12C.  
11.1  
Stacking Height  
Mating headers from Hirose are available in different stacking heights, allowing the spacing between  
the BISM2 and carrier pcb to be changed from 3.5mm to 5.0mm.  
Item  
Part number  
Stacking height  
HRS number  
Receptacle on  
Module  
DF12C-40DS-0.5V(86)  
3.5 mm – 5 mm  
CL537-0007-7-86  
Headers DF12 series  
DF12(3.5)-40DP-0.5V(86)  
DF12(4.0)-40DP-0.5V(86)  
DF12(5.0)-40DP-0.5V(86)  
3.5 mm  
4.0 mm  
5.0 mm  
CL537-0032-4-86  
CL537-0057-5-86  
CL537-0157-0-86  
Notes: The headers listed above are with boss and metal fitting.  
Suffix -86 denotes RoHS compliance.  
11.2  
Hirose Connector general specification  
Parameter  
Specification (40 pin Board to Board connector)  
Number of Contacts  
Quantity delivered  
Voltage  
40  
2000 Connectors per Tape & Reel  
50V  
Current Rating  
0.5A max per contact  
0.05 Ohm per contact  
500V RMS min  
Resistance  
Dielectric Withstanding Voltage  
Operating Temperature  
Contact Material  
-45°C...+125°C  
phosphor bronze (surface: gold plated)  
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Insulator  
Material PA , beige natural  
Stacking height  
Insertion force  
3.0 mm ; 3.5 mm ; 4.0 mm ; 5.0 mm  
21.8N  
10N  
Withdrawal force 1st  
Withdrawal force 50th  
10N  
Maximum connection cycles  
50  
12. Qualification  
12.1  
Bluetooth Qualification Process  
The following safety precautions must be observed during all phases of the operation, usage, service  
or repair of any application incorporating this Module. Manufacturers of the RF equipment are advised  
to convey the following safety information to users and operating personnel and to incorporate these  
guidelines into all manuals supplied with the product. Failure to comply with these precautions  
violates safety standards of design, manufacture and intended use of the product. Ezurio assumes no  
liability for customer failure to comply with these precautions.  
12.2  
Safety Information:  
Switch off the Bluetooth device before boarding an aircraft. Make sure it cannot be switched on  
inadvertently. The operation of wireless appliances in an aircraft is forbidden by many airlines to  
prevent interference with communications systems. Applications that could result in use on aircraft  
should carry appropriate warnings.  
12.3  
Qualifications  
12.3.1 RF approvals  
The Module is listed as a Bluetooth Product in terms of the Bluetooth SIG Program Reference  
Document (PRD). This means that it can be integrated into end products without further testing or  
approval listing. The manufacturer must state the Ezurio part number and product reference in his  
literature in order to meet the requirements of the Bluetooth and regulatory approvals.  
A list of the countries where the Module is approved will be provided by Ezurio as required. As a  
minimum the product is listed in Europe, Scandinavia and USA. Ezurio assumes no liability for  
customer failure to comply with national RF approvals.  
12.3.1.1  
EMC Emissions  
EN 300 328 V1.5.1 (2004-08)  
12.3.1.2  
EMC Immunity  
EN 301 489-1 V1.4.1 (2002-08)  
12.3.1.3  
FCC  
FCC Part 15.247:2004 (Subpart C)  
FCC ID: PI401B  
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12.4  
Safety and Regulatory Statements  
12.4.1 Europe – EU Declaration of Conformity  
DECLARATION OF CONFORMITY  
In accordance with Annex IV of the EU directive 1999/5/EC  
Ezurio declare under our responsibility that the BISM2 Module  
complies with the appropriate essential requirements of the Article 3 of  
the R&TTE and the other relevant provisions, when used for its intended  
purpose.  
Health and Safety requirements contained in Article 3 (1) a)  
EN 60 950: 1992 Safety of information technology equipment +  
Amendment A1:1993, Amendment A2:1993, Amendment A3:1995,  
Amendment A4:1997, Amendment A11:1997  
EN 50371: Generic standard to demonstrate the compliance of low-power  
electronic and electrical apparatus with the basic restrictions related to  
human exposure to electromagnetic fields (10 MHz - 300 GHz) – General  
public  
Protection requirements with respect to electromagnetic compatibility  
Art.3 (1) b)  
EN 301 489-1 V1.4.1 (2002-08), Electromagnetic Compatibility and  
radio spectrum Matters (ERM); Electro Magnetic Compatibility (EMC)  
standard for radio equipment and services; Part 17: Specific  
conditions for wideband data HiperLAN equipment  
Means of the efficient use of the radio frequency spectrum  
EN 300 328 V1.5.1 (2004-08), Radio Equipment and Systems (RES);  
Wideband transmission systems; Technical characteristics and test  
conditions for data transmission equipment operating in the 2,4 GHz  
ISM band and using spread spectrum modulation techniques. Part 2:  
Harmonized EN covering essential requirements under article 3(2) of  
the R&TTE directive.  
Ezurio Ltd  
Saturn House, Mercury Park  
tel: +44 (0) 1628 858 940  
Registered in England  
No. 5178293  
Wooburn Green HP10 0HH, United Kingdom www.ezurio.com  
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12.4.2 FCC and Industry Canada Statements  
This device complies with part 15 of the FCC Rules. Operation is subject to the following two  
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any  
interference received, including interference that may cause undesired operation.  
Changes or modifications not expressly approved by the party responsible for compliance could void  
the user's authority to operate the equipment.  
12.4.2.1  
FCC Labelling requirement  
If the FCC ID is not visible when the module is installed inside another device, then the outside of the  
device into which the module is installed must also display a label referring to the enclosed module.  
This exterior label can use wording such as the following: “Contains Transmitter Module FCC ID:  
PI401B” or “Contains FCC ID: PI401B.” Any similar wording that expresses the same meaning may be  
used.  
13. Environmental  
13.1  
Operating temperatures  
Parameter  
Min  
Typ  
Max  
Unit  
Operating temp (standard product)  
-40  
25  
+85  
°C  
13.2  
Storage temperature  
Parameter  
Min  
Max  
Unit  
°C  
Storage temp  
-40  
+125  
13.3  
Reliability  
Parameter  
Thermal Shock  
Vibration  
Test  
Comment  
200 cycles -40ºC /+85ºC 30 min  
1 cycle/hour  
Continuous operation at 60 Hz,  
2mm stroke  
15g max sine wave, 12 hours  
Shock  
50G 11ms Half Sine Wave  
6 axis x 3 cycles each axis  
Moisture Resistance  
High Temp Storage  
Low Temp Storage  
85ºC, 360 hours  
-40ºC, 240 hours  
High Temp/Humidity  
Operation  
60ºC, 90%RH, 360 hours  
Thermal shock  
-40 to 60ºC in 30min  
200 cycles with continuous  
operation  
Electro Static Discharge  
Drop Test  
EN55024:1998 & IEC61000-4-3  
75cm to concrete, 3 axis x 2  
cycles per corner  
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14. Physical Dimensions  
14.1  
Mechanical Dimensions  
14.1.1 Standard Module  
Location of Connector  
(Bottom View)  
All dimensions in mm  
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14.2  
BISM2 Module without antenna (special order)  
The dimensions for this module are identical to the standard BISM2 illustrated above, but the antenna  
is replaced with a U-FL connector.  
TOP VIEW  
The external antenna used must not result in an increased output power. I.e. the total gain of mating  
connector, cable and antenna must not exceed +2dB. If a higher gain antenna is connected, it will  
invalidate the RF and Bluetooth approvals for the module. The external antenna must provide a 50  
Ohm impedance.  
The antenna connector is a U.FL connector, supplied by Hirose. Mating connectors with cables are  
available from Hirose and their distributors, and also from other cable suppliers. The data sheet for  
the connector series is available at http://www.hirose.co.jp/cataloge_hp/e32119372.pdf  
14.2.1 External Antennae  
A variety of manufacturers can supply external antennae suitable for use with the BISM2 module  
without antenna. Users should be aware that the choice of antenna may affect the qualification of the  
module.  
To ensure that the qualification is not affected, the TOTAL GAIN of the external antenna, including  
insertion loss of the connectors and cable must be less than 2dBi. If a higher gain is employed, then  
the pre-qualified status of the module will be lost. It is the customer’s responsibility to ensure that  
an external antenna does not negate the qualification.  
Centurion (www.centurion.com) manufacture a snap-  
in external connector of the form generally known as  
a “rubber duck” with a 100mm captive lead  
terminated in a U.FL connector that is particularly  
appropriate for use with the BISM2 module.  
The part number is WCR 2400-IP  
NovaETS (www.novaets.com) in the UK supply a  
rubber duck antenna with U.FL connection.  
The ordering information is W-154C 2dB Wireless  
LAN Antenna (2.4GHz) Assembled with U.FL (iPX)  
Connector.  
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Reel – Rienheimer Elektronic (www.reel-gmbh.de)  
manufacture a wide range of antennae, including  
their planTEc roof antennae that are ideal for vehicle  
mounting.  
Part Number M70CXR 0300 00 XX XX  
(Contact Reel for availability of a U.FL connection  
and exact part number)  
Pacific Wireless (www.pacwireless.com) supply a  
wide range of antennae, including high gain  
antennae. Although these will require  
requalification, they may be appropriate for longer  
range applications. The RooTenna is a good solution  
for IP65 applications.  
U.FL to SMA adaptors / pigtails  
Other antennas can be used with a pigtail that goes  
from the U.FL connection on the BISM2 to the  
appropriate antenna connection, moat commonly a  
reverse SMA. These are available from a variety of  
sources, a good range is supplied by:  
High volume quantities can be obtained from Hirose.  
When connecting to SMA antennae, please check  
whether your antenna is a normal or reverse thread.  
14.3  
BISM1 Compatible Module (special order)  
The BISM1 Compatible format version of the BISM2 Bluetooth Serial Module, preserves all of the  
mechanical mounting detail and dimensions of the earlier module design.  
This is a special order module for customers who are currently in production with the BISM1, but want  
to migrate to the additional features of the BISM2. It is not recommended for new designs.  
TOP VIEW  
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SIDE VIEW  
All dimensions in mm.  
14.4  
Labelling  
The label contains the Part number and the unique Bluetooth address of the module.  
14.5  
Ordering Information  
The BISM2 is available with different variants of engineering or production firmware. Ordering  
information is provided below:  
Part Number  
Description  
Firmware Version  
TRBLU23-00200  
BISM2 with integrated ceramic antenna and  
standard AT firmware  
Version 7.18.0  
The following parts are available to special order. Please contact your Ezurio representative:  
Part Number  
Description  
Firmware Version  
TRBLU23-002MP BISM2 with integrated ceramic antenna and  
Version 5.13.ES  
standard Multipoint firmware  
TRBLU23-002HC BISM2 with integrated ceramic antenna and  
Version 00056-01  
Version 2.11.0  
standard HCI firmware  
TRBLU23-00300  
BISM2 with U.FL jack and standard AT  
firmware  
TRBLU23-003MP BISM2 with U.FL jack and standard Multipoint Version 5.13.ES  
firmware  
TRBLU23-003HC BISM2 with U.FL jack and standard HCI  
Version 00056-01  
firmware  
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15. Related Documents  
blu2i AT Command Set Version 2.11.0 Reference Manual  
blu2i Firmware Release Notes Version 2.11.0  
blu2i Multipoint Firmware Reference Manual  
BISM Bluetooth Serial Module - Quick Start Guide  
BISM Bluetooth Serial Module - FAQ  
Blu2i Application Scenarios  
Wireless Developer’s Kit User Guide  
ACC-005 Winbond W61360 Audio Codec Board Manual  
ACC-006 OKI 7702 Audio Codec Board Manual  
Bluetooth Core 2.0 Specification – www.bluetooth.org  
16. Differences from previous modules  
The BISM2 has been designed to be a drop in replacement for previous BISM modules from TDK  
Systems and Ezurio. However, some additional features have been made. This section lists all of  
these changes. More details can be found in the relevant section of the data sheet.  
Significant additions have been made to the AT command set.  
Pin 27 is now marked as RESERVED instead of VCC_3V3. It can no longer be relied to provide a 3.3v  
regulated output.  
Pins 33, 35 & 37 are now GPIO instead of N/C. The default state is configured as an inputs.  
Pin 39 is now allocated as GPIO9 which defaults as an input line instead of a “VCC_1V8” monitor.  
This change has been made to increase the I/O capability and to prevent noise being injected onto  
the 1V8 rail.  
The module is physically smaller so the fixing holes no longer align with those of the previous module.  
A brown-out circuit is now incorporated on the module. Reset functionality remains the same.  
The Oscillator output is now available.  
17. Disclaimers  
EZURIO’S BLUETOOTH PRODUCTS ARE NOT AUTHORISED FOR USE AS CRITICAL COMPONENTS IN  
LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE  
MANAGING DIRECTOR OF EZURIO LTD.  
The definitions used herein are:  
a) Life support devices or systems are devices which (1) are intended for surgical implant into the  
body, or (2) support or sustain life and whose failure to perform when properly used in accordance  
with the instructions for use provided in the labelling can reasonably be expected to result in a  
significant injury to the user.  
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b) A critical component is any component of a life support device or system whose failure to perform  
can be reasonably expected to cause the failure of the life support device or system, or to affect its  
safety or effectiveness.  
Ezurio does not assume responsibility for use of any of the circuitry described, no circuit patent  
licenses are implied and Ezurio reserves the right at any time to change without notice said circuitry  
and specifications.  
17.1  
Data Sheet Status  
Ezurio Ltd reserve the right to change the specification without notice in order to improve the design  
and supply the best possible product.  
Please check with Ezurio Ltd for the most recent data before initiating or completing a design.  
Where reference is made to related products from other suppliers, Ezurio takes no responsibility for  
the information, availability or performance of such products.  
17.2  
Warranty  
Ezurio warrants that its products shall conform to Ezurio’s published specifications and remain free  
from defects in materials and workmanship under normal, proper and intended use for a period of  
two (2) years from date of purchase, provided that proof of purchase be furnished with any returned  
equipment.  
If during the warranty period any component part of the equipment becomes defective by reason of  
material or workmanship, and Ezurio is immediately notified of such defect, Ezurio shall at its option  
supply a replacement part or request return of equipment, freight prepaid, to its designated facility  
for repair. In the event no trouble is found on products returned for repair, Ezurio reserves the right  
to charge the customer its standard published repair charge.  
This warranty shall not apply to any products that have been subject to misuse, bending, twisting,  
neglect, alteration, improper installation, testing or unauthorized repair performed by anyone other  
than a Ezurio designated repair facility. Any non-warranty repairs or maintenance shall be at Ezurio’s  
standard rates in effect at the time.  
This warranty is in lieu of all other warranties, whether expressed, implied, or statutory, including but  
not limited to, implied warranties or merchantability and fitness for a particular purpose. In no event  
shall Ezurio be liable, whether in contract, in part, or on any other basis, for any damage sustained by  
its customers or any other person arising from or related to loss of use, failure or interruption in the  
operation of any products, or delay in maintenance, or for incidental, consequential, in direct, or  
special damages or liabilities, or for loss of revenue, loss of business, or other financial loss arising  
out of or in connection with the sale, lease, maintenance, use, performance, failure, or interruption of  
these products.  
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