RET-3570LP User Manual
RET-3570LP User Manual
Version 1.1
2007/07/09
This document contains information highly confidential to RoyalTek Company LTD
(RoyalTek). It is provided for the sole purpose of the business discussions between customer
and RoyalTek and is covered under the terms of the applicable Non-Disclosure Agreements.
Disclosure of this information to other parties is prohibited without the written consent of
RoyalTek.
Prepared by RoyalTek Company LTD.
8F, 256 Yang Guang Street, Neihu Chiu,Taipei, Taiwan
TEL: 886-2-77215000
FAX: 886-2-77215666
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1. Introduction
RoyalTek RET-3570LP small form factor board is the newest generation of RoyalTek
GPS plus TMC module. TMC can deliver real-time traffic and travel information to
drivers. The driver can be notified of problems on the planned route, at the same time,
TMC calculates and provide an alternative route to help driver avoid the incident. The
combo module is powered by latest SiRF Star III single chip and RoyalTek
proprietary navigation technology that provides you with stable and accurate
navigation data. The smallest form factor and miniature design is the best choice to be
embedded in a device such as portable navigation device, personal locator, and speed
camera detector and vehicle locator.
1.1 Product Features
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
20 parallel channels
TMC embedded
TMC frequency 87.5MHz--108MHz
SMT type with stamp holes
TCXO design
0.1 second reacquisition time
Small form factor with embedded SiRF Star III single chip technology.
NMEA-0183 compliant protocol/ Royaltek TMC protocol
Enhanced algorithm for navigation stability
Excellent sensitivity for urban canyon and foliage environments.
DGPS (WAAS, EGNOS ) support
Auto recovery while RTC crashes
1.2 Product Applications
ꢀ
ꢀ
ꢀ
ꢀ
Automotive navigation
Personal positioning and navigation
Marine navigation
Timing application
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1.3 Product Pictures and Interface board
(1) RET-3570LP
Pin 1
(2) RET-3570LP Interface board
The interface board pin definition
J2 CONNECTOR
Pin # Signal Name I/O Description
Characteristics
1
2
N.C
N.C
Backup voltage supply
3
Battery
I
DC + 2.5 ~ +3.6V
Current ≤10uA
4
5
VCC
Reset
I
I
DC Supply Voltage input
Reset (Active low)
DC +3.3V±10%
VIH > 2.3V ;VIL < 0.8V
6-10 N.C
2.375V ≤VOH ≤ 2.85V
CMOS TTL level
VOL ≤ 0.715V
11
TXA
O
I
Serial port A
Serial port A
1.995V ≤VIH ≤ 3.15V
CMOS TTL Level
- 0.3V ≤VIL ≤ 0.855V
12
RXA
13
14
N.C
2.375V ≤VOH ≤ 2.85V
VOL ≤ 0.715V
TXB
O
Serial port B
CMOS TTL level
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1.995V ≤VIH ≤ 3.15V
- 0.3V ≤VIL ≤ 0.855V
15
RXB
I
Serial port B
CMOS TTL Level
16
17
18
19
20
N.C
1.995V ≤VIH ≤ 3.15V
- 0.3V ≤VIL ≤ 0.855V
Boot
GND
N.C
I
Boot mode
Ground
G
N.C
Switch U4
Pin # Signal Name 0/1 Description
Characteristics
Switch:
0: Low 1:High CMOS TTL Level
1
2
3
GPIO-0
GPIO input/output
GPIO input/output
GPIO input/output
(N.C for RET-3570) 0: Low 1:High CMOS TTL Level
(N.C for RET-3570)
PPS output
GPIO-4
Switch:
0: Low 1:High CMOS TTL Level
Switch:
GPIO-15
(N.C for
RET-3570)
PPS
4
5
6
Switch:
0: Low 1:PPS output
Switch:
0: Low 1: DC 3.3V output
Switch:
GPS_3V3
TMC_3V3
Power supply for
GPS section
Power supply for
TMC section
0: Low 1: DC 3.3V output
7
8
N.C
RF_Bias
RF_Bias voltage
switch
0: open. No voltage provide antenna.
1:Provide 2.85V to antenna.
Connector:
Pin # Description
Characteristics
1575.42MHz
J1
J5
J4
GPS RF Connector
FM RF Connector
Stereo Jack
87.5MHz~108MHz
Audio output
(Right and Left channel)
RoyalTek Evaluation Kit REV-2000 for RET-3570 LP
(Please refer to RoyalTek Evaluation Kit REV-2000 for RET-3570 Operational Manual for more
information.)
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1.4 System Block Diagram
System block diagram description:
(1) External antenna.
(2) 4 Mega bits flash memory
(3) 31 pin I/O pin
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1.5 Technical Specification
Impedance：50Ω
No
Function
Specification
GPS receiver
1
Chipset
SiRF Star III, GSC3f/LP
(Digital, RF in a single package)
L1 1575.42MHz.
C.A. Code.
20 parallel
-159dBm.
2
3
4
5
6
7
Frequency
Code
Channels
Chipset Sensitivity
Chipset Cold start @open sky 35 sec
Chipset Warm start @open 35 sec
sky
8
9
Chipset Hot start @open sky 1 sec
Reacquisition
0.1sec typical
10 Position accuracy
11 Maximum altitude
12 Maximum velocity
13 Trickle power mode
10meters at 2D RMS.
18000 m
514 m/s
Duty cycle ≦ 34%. (Variable)
14 Update rate
15 Testability
Continuous operation: 1Hz
It shall be able to be tested by SiRF test IV and single channel
simulator.
16 Protocol setup
17 DGPS
It shall store the protocol setup in the SRAM memory.
WAAS, EGNOS
Interface
18 LNA
19 I/O Pin
No LNA
31pin
TMC/RDS receiver
20 Frequency
87.5~108MHz. US/Europe
24.7uV typical
Δf=22.5kHz, fAF = 1kHz,L=R, fRDS=1.2kHz,
21 RDS sensitivity
De-emphasis= 50us,
Block Quality Rate ≧85%
22 Right and Left audio output Conditions:
VRF =1mV ; L = R ; ∆f = 22.5KHz ; fmod =1KHz ; No
voltage
pre-emphasis; TCdeem = 75us
Output voltage:
Min= 55 mV
Typ=66 mV
Max=75mV
Mechanical requirements
23 Weight
≦3.5g
Power consumption
24 Vcc
DC 3.3 ±5%
Current
GPS:
25
Fix mode Current 36mA average.
RDS Current: 15mA typical
Environment
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26 Operating temperature
27 Humidity
-40 ~ 85℃
≦95%
1.6 Application Circuit
Reference:
Note:
(1) Ground Planes:
RET3570LP GPS receiver needs two different ground planes.
These pins(13、15、16、18) should be connected to analog ground.
These pins(2、10、30) should be connected to digital ground.
(2) Serial Interface:
(I)The TXA pin is recommended to pull up (10KΩ). It can increase the stability of
serial data.
(II) The TXB pin is recommended to connect to serial resistance(220Ω) and pull
up (10KΩ), if use the DGPS output.
If the DGPS output is not used, it won’t connect anything.
(III) The RXB pin is recommended to connect to serial resistance(220Ω), if the DGPS
output is used.
If the DGPS output is not used, it won’t connect anything.
(3) Backup Battery:
It’s recommended to connect a backup battery to V_RTC_3V3 in order to enable the warm
start and hot start features of the GPS receiver. If you don’t intend to use a backup battery,
connect this pin to GND or float it.
If you use a backup battery, you should add a bypassing capacitor (10uF) at V_RTC_3V3
pin to reduce noise and increase the stability.
(4) GPS_RF_IN:
Connecting to the antenna has to be routed on the PCB. The transmission line must control
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impedance to connect RF_IN to the antenna or any antenna connectors that you prefer.
(Impedance 50Ω)
(5) FM_RF_IN:
Connecting to the antenna has to be routed on the PCB. The transmission line must control
impedance to connect FM_RF_IN to the antenna or any antenna connectors that you prefer.
(Impedance 50Ω)
(6) Power:
Connect V_GPS_3V3 and V_TMC_3V3 pin to DC 3.3V. The power supply must add a
bypassing capacitor (10uF and 1uF) to reduce the noise from power supply and increase
power stability.
(7) Active antenna bias voltage:
The Vcc_RF_OUT pin (pin 20) provides voltage 2.85V. If you use an active antenna, you
can connect this pin to V_ANT_IN pin (pin 19) for providing bias voltage of an active
antenna. The bias voltage will run through GPS_RF_IN pin to provide active antenna bias
voltage from Vcc_RF_OUT pin.
If your bias voltage of an active antenna isn’t 2.85V, you can input bias voltage that you
need to V_ANT_IN pin (pin 19). The input bias voltage will run through GPS_RF_IN pin
to provide active antenna bias voltage from V_ANT_IN pin.
PS:
(Ⅰ). The maximum power consumption of active antenna is around 85mW.
(Ⅱ). The input gain ranges from 12 to 26dB.
(8) GPIO:
The GPIO pin is recommended to connect to serial resistance(220Ω), if the GPIO function
is used.
If GPIO function is not used, it won’t connect anything.
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1.7 Recommended layout PAD
Top View
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1.8 Mechanical Layout
Unit: mm
P17
P16
P31
P1
1.9 Test Software Specification
No
1
2
3
4
Function
Clock offset
Clock Drift
C/No Hi Power Mean
C/No Hi Power Sigma
Bit Sync
Specification
88000Hz≦Measurement≦104000Hz
Measurement≦200Hz
Measurement≧38dB
Measurement≦2dB
Measurement≦5 Sec
5
6
7
Frame Sync
Phase Error
Measurement≦28 Sec
Measurement≦0.22°
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1.10 Hardware interface
Interface Pin Number:
Pin # Signal Name
I/O Description
Characteristics
DC +3.3V±5%
Reference Ground
1
2
3
4
5
6
7
8
V_GPS_3V3
GND
I
DC Supply Voltage input
G
I
Ground
1.995V ≤VIH ≤ 3.15V
1.995V ≤VIH ≤ 3.15V
2.375V ≤VOH ≤ 2.85V
2.375V ≤VOH ≤ 2.85V
1.995 ≤VIH ≤ 3.15V
- 0.3V ≤VIL ≤ 0.855V
- 0.3V ≤VIL ≤ 0.855V
VOL ≤ 0.715V
BOOT
RXA
Boot mode
Serial port A
Serial port A
Serial port B
Serial port B
I
TXA
O
O
I
VOL ≤ 0.715V
TXB
- 0.3V ≤VIL ≤ 0.855V
RXB
N.C
Indicates power state of RF
part
VOH = 2.85V ;VOL = 0V
9
RF_ON
O
10
11
GND
G
O
Ground
Reference Ground
VAFL Output voltage 66mV(typical) ~75mV(max)
RAFL Output resistance 50Ω(min) ~ 100Ω
VAFL Output voltage 66mV(typical) ~75mV(max)
RAFL Output resistance 50Ω(min) ~ 100Ω
Reference Ground
AUDIO_R
Audio right channel output
12
AUDIO_L
O
Audio Left channel output
13
14
GND
G
I
Ground
FM antenna input
FM_RF_IN
FM antenna input
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(Input impedance 50Ω; Frequency 87.5~108MHz)
Reference Ground
15
16
17
18
19
GND
G
G
I
Ground
GND
Ground
Reference Ground
GPS_RF_IN
GND
GPS Signal input
Ground
50 Ω @1.57542GHz
G
I
Reference Ground
Active Antenna Bias
voltage
V_ANT_IN
Receiving DC power supply for active antenna bias.
VO = 2.85V ± 5%
20
21
VCC_RF_OUT O Supply Antenna Bias
voltage
Current<30mA
V_RTC_3V3
I
Backup voltage supply
DC + 2.5 ~ +3.6V
Current ≤10uA
VIH > 2.3V ;VIL < 0.8V
22
23
24
25
RESET
N.C
I
Reset (Active low)
N.C
1.995V ≤VIH ≤ 3.15V
2.375V ≤VOH ≤ 2.85V
1.995V ≤VIH ≤ 3.15V
2.375V ≤VOH ≤ 2.85V
- 0.3V ≤VIL ≤ 0.855V
VOL ≤ 0.715V
GPIO4
I/O General purpose I/O
I/O General purpose I/O
- 0.3V ≤VIL ≤ 0.855V
VOL ≤ 0.715V
26
GPIO0
27
28
29
30
31
N.C
N.C
2.375V ≤VOH ≤ 2.85V
Reference Ground
DC +3.3V±5%
VOL ≤ 0.715V
PPS
O
G
I
One pulse per second
Ground
GND
V_TMC_3V3
DC Supply Voltage input
V_GPS_3V3 (+3.3V DC power Input)
This is the DC power supply input pin for GPS system. It provides voltage for module.
GND
GND provides the ground.
BOOT
Set this pin to high for programming flash.
RXA
This is the main receiver channel. The main function is to receive software commands from
SIRFdemo software or other user’s application.
RXB
This is the auxiliary receiving channel. The main function is to input differential corrections,
then deliver them to the board for DGPS navigation.
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TXA
This is the main transmitting channel and is used to output navigation and measurement data
to SiRFdemo or from user’s application.
TXB
For user’s application.(Not current use).
RF_ON
This pin indicates the status of RF voltage.
V_TMC_3V3 (+3.3V DC power Input)
This is the DC power supply input pin for TMC function. It provides voltage for TMC section
of the module.
AUDIO_R
This pin is the function of audio right channel output.
AUDIO_L
This pin is the function of audio left channel output.
FM_RF_IN
This pin can receive FM analog signal. The trace on the PCB from the antenna(or antenna
connector) has to be controlled impedance line (Micro strip at 50Ω).
GPS_RF_IN
This pin can receive GPS analog signal. The trace on the PCB between the antenna(or antenna
connector) has to be a controlled impedance line (Micro strip at 50Ω).
V_ANT_IN
This pin is reserved as external DC power supply input for an active antenna.
If using 2.85V active antenna, the pin 20 has to be connected to pin 19.
If using 3.3V or 5V active antenna, this pin has to be connected to 3.3V or 5V power supply.
PS: The current must be ≦100mA and voltage ≦12V, if external power supply is used.
VCC_RF_OUT
This pin can provide power [email protected] for an active antenna.
RESET
This pin provides an active-low reset input for the board. It causes that the board resets and
starts to search for satellites. If RESET pin is not used, it won’t connect anything.
PPS
This pin provides one pulse-per-second output from the board, which is synchronized to GPS
time. This is not available in Trickle Power mode.
V_RTC_3V3 (Backup battery)
This is the battery backup input that powers the SRAM and RTC when the main power is
removed. Typical current draw is 10uA.
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The supply voltage should be between 2.5V and 3.6V.
GPIO Functions
Several I/Os are connected to the digital interface connector for customer
applications.
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2. Software Interface
NMEA V3.0 Protocol
Its output signal level is TTL: 38400 bps (default), 8 bit data, 1 stop bit and no parity. It supports the
following NMEA-0183
Messages: GGA, GSA, GSV, RMC .
NMEA Output Messages: the Engine board outputs the following messages as shown in Table 1:
Table 1 NMEA-0183 Output Messages
NMEA Record
GGA
Description
Global positioning system fixed data
GNSS DOP and active satellites
GNSS satellites in view
GSA
GSV
RMC
Recommended minimum specific GNSS data
GGA-Global Positioning System Fixed Data
Table 2 contains the values of the following example:
$GPGGA, 161229.487, 3723.2475, N, 12158.3416, W, 1, 07, 1.0, 9.0, M, , , ,0000*18
Table 2 GGA Data Format
Name
Message ID
Example
Units
Description
GGA protocol header
hhmmss.sss
$GPGGA
UTC Position
Latitude
161229.487
3723.2475
ddmm.mmmm
N/S Indicator
Longitude
N
N=north or S=south
Dddmm.mmmm
12158.3416
E/W Indicator
Position Fix Indicator
Satellites Used
HDOP
W
1
E=east or W=west
See Table 2-1
07
1.0
9.0
M
Range 0 to 12
Horizontal Dilution of Precision
MSL Altitude
Units
meters
meters
meters
meters
second
Geoid Separation
Units
M
Null fields when DGPS is not
used
Age of Diff. Corr.
Diff. Ref. Station ID
Checksum
0000
*18
＜CR＞＜LF＞
End of message termination
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Table 3 Position Fix Indicators
Description
Fix not available or invalid
Value
0
1
GPS SPS Mode, fix valid
2
Differential GPS, SPS Mode, fix valid
Not Supported GPS PPS Mode, fix valid
Dead Reckoning Mode, fix valid
3-5
6
GSA-GNSS DOP and Active Satellites
Table 2-4 contains the values of the following example:
$GPGSA, A, 3, 07, 02, 26, 27, 09, 04, 15, , , , , , 1.8,1.0,1.5*33
Table 4 GSA Data Format
Name
Message ID
Mode 1
Example Units
Description
GSA protocol header
$GPGSA
A
3
See Table 4-2
Mode 2
See Table 4-1
Satellite Used
Satellite Used
….
07
02
Sv on Channel 1
Sv on Channel 2
….
Satellite Used
PDOP
Sv on Channel 12
Position Dilution of Precision
Horizontal Dilution of Precision
Vertical Dilution of Precision
1.8
1.0
1.5
*33
HDOP
VDOP
Checksum
＜CR＞＜LF＞
End of message termination
Table 5 Mode 1
Value
Description
1
2
3
Fix not available
2D
3D
Table 6 Mode 2
Value
Description
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M
A
Manual-forced to operate in 2D or 3D mode
Automatic-allowed to automatically switch 2D/3D
GSV-GNSS Satellites in View
Table 7 contains the values of the following example:
$GPGSV, 2, 1, 07, 07, 79, 048, 42, 02, 51, 062, 43, 26, 36, 256, 42, 27, 27, 138, 42*71$GPGSV, 2, 2,
07, 09, 23, 313, 42, 04, 19, 159, 41, 15, 12, 041, 42*41
Table 7 GGA Data Format
Name
Message ID
Number of
Messages1
Example
$GPGSV
2
Units
Description
GSV protocol header
Range 1 to 3
Messages Number1
Satellites in View
Satellite ID
Elevation
1
07
07
79
048
42
Range 1 to 3
Channel 1(Range 1 to 32)
degrees Channel 1(Maximum 90)
degrees Channel 1(True, Range 0 to 359)
dBHz Range 0 to 99, null when not tracking
….
Azimuth
SNR (C/No)
….
Satellite ID
Elevation
27
27
Channel 4(Range 1 to 32)
degrees Channel 4(Maximum 90)
degrees Channel 4(True, Range 0 to 359)
dBHz Range 0 to 99, null when not tracking
Azimuth
138
42
SNR (C/No)
Checksum
*71
＜CR＞＜LF＞
End of message termination
1Depending on the number of satellites tracked multiple messages of GSV data may be required.
RMC-Recommended Minimum Specific GNSS Data
Table 8 contains the values of the following example:
$GPRMC, 161229.487, A, 3723.2475, N, 12158.3416, W, 0.13, 309.62, 120598, ,*10
Table 8 GGA Data Format
Name
Message ID
Example
$GPRMC
161229.487
A
Units
Description
RMC protocol header
UTC Position
Status
hhmmss.sss
A=data valid or V=data not valid
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Latitude
3723.2475
N
ddmm.mmmm
N/S Indicator
Longitude
N=north or S=south
dddmm.mmmm
E=east or W=west
12158.3416
W
E/W Indicator
Speed Over Ground
Course Over Ground
Date
0.13
knots
309.62
120598
degrees
True
ddmmyy
Magnetic Variation
Mode
degrees
E=east or W=west
A
A=Autonomous, D=DGPS, E=DR
Checksum
*10
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3. GPS Receiver User’s Tip
A. GPS signal will be affected by weather and environment conditions, so it is recommended to use
the GPS receiver under less shielding environments to ensure GPS receiver has better receiving
performance.
B. When GPS receiver is moving, it will prolong the time to fix the position, so it is recommended
to wait for the satellite signals locked at a fixed point when first power-on the GPS receiver to
ensure to lock the GPS signal at the shortest time.
C. The following situation will affect the GPS receiving performance:
i.
ii.
Solar control filmed windows.
Metal shielded, such as umbrella, or in vehicle.
Among high buildings.
iii.
iv.
v.
Under bridges or tunnels.
Under high voltage cables or near by radio wave sources, such as mobile phone base
stations.
vi.
Bad or heavy cloudy weather.
D. If the satellite signals can not be locked or encounter receiving problem (while in the urban area),
the following steps are suggested:
i.
Please plug the external active antenna into GPS receiver and put the antenna on outdoor or
the roof of the vehicle for better receiving performance.
Move to another open space or reposition GPS receiver toward the direction with less
blockage.
ii.
iii.
iv.
Move the GPS receiver away from the interferences resources.
Wait until the weather condition is improved.
E. While a GPS with a backup battery, the GPS receiver can fix a position immediately at next
power-on if the build-in backup battery is full-recharged.
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4. Package Specification and Order Information
Shipment Method: Tape and reel
5. Contact Royaltek
Contact: [email protected]
Headquarter:
Address: 8F, 256 Yang Guang Street, Neihu Chiu, Taipei, Taiwan
Tel: 886-2-77215000
Fax: 886-277215666
6. Revision History
Title
RET-3570LP
Doc Type User Manual
Revision
Date
Author
Change notice
Number
0.1
0.2
1.0
1.1
20076/03/26
2007/03/28
2007/03/29
2007/07/09
May Chen
May Chen
May Chen
May Chen
Initial Release
Remove RTCM Protocol
Final Release
Modify the chipset TTFF @open sky
Copyright © 2005-2006, RoyalTek Company Ltd.
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