EVB-EMC2101 User Manual
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SMSC EMC2101
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2 Getting Started
2.1
2.2
System Requirements
To use the EVB you will need:
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A PC running Windows 2000 or XP
Display resolution 800x600 (or larger to view several windows simultaneously)
An available USB port
Feature Summary
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Chip Manager (SMSC application) allows viewing and changing register values
Graphing of any register
Headers for connecting a remote diode or CPU/GPU thermal diode
Resistance Error Correction verification
Autonomous register loading via included EEPROM (EMC2101-R only)
USB communication to evaluation board
An external SMBus master may also be used via jumper settings
2.3
Installing the EVB
1. Install the Chip Manager (ChipMan) application and device driver on a PC by running Setup.exe
from the ChipMan distribution CD. A revision history and install/uninstall notes may be found in the
readme.txt file on the disk.
2. Connect the supplied USB cable to an available USB port on the PC. Plug the “mini-B” end of the
USB cable into EVB connector P6. The +3.3V and Bridge ACT LEDs should illuminate. After the
EVB is connected to the PC the “Find New Hardware” wizard will pop up for USB driver installation.
Follow the instructions in the readme.txt file to complete the installation process.
3. Start the EVB Software by selecting the Chip Manager application from the SMSC folder from the
Programs Windows Start menu. The EVB will initialize and the Chip Manager Quick Help screen
running. For more help with ChipMan, select Help -> Contents for an html based help document
Note: The SMSC ChipMan application allows viewing and changing register values for a variety of
EVBs including the EMC1001, EMC1002, EMC1023, EMC1033 and EMC2101. The ChipMan
software only needs to be installed once to support all of these EVBs. The list of supported
EVBs may be found in the pulldown menu under Options -> Select Device.
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3 Hardware Description
3.1
Introduction
The EMC2101 EVB provides the means to demonstrate EMC2101 features and to view and modify
registers. A +12V fan and power supply are provided to demonstrate the fan control functionality. LEDs
indicate status information and test points are included to monitor system voltages with a user provided
Figure 3.1 EVB Block Diagram
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3.2
3.3
EMC2101
The EMC2101 is an SMBus temperature sensor with 1 internal and 1 external sensor in an 8 pin
MSOP and 8 pin SOIC package. Communications with the EMC2101 sensor is via the SMBus.
USB to SMBus Bridge
The USB to SMBus bridge is based on an 8051 micro controller with integrated USB and SMBus
interfaces as well as internal flash and RAM. During EVB manufacture, firmware is loaded into the
bridge that provides the interface between the USB and the SMBus. Power is sourced to the micro
controller from the USB interface for device power and communication.
3.3.1
Direct SMBus Connect Option
It is also possible to connect an external SMBus master to the EMC2101 EVB. A few jumper settings
are all that is required to drive the EMC2101:
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Simply remove the jumpers on JP6 and connect the SMBus master to the SCL, SDA and ALERT
pins, as well as an external supply for +3.3V.
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The +3.3V can be supplied by the SMBus bridge by leaving the +3.3V jumper in place and retaining
the USB connection.
3.4
3.5
Connecting to Remote Diodes
This EVB is populated with jumpers to connect to an external diode or CPU/GPU. If connecting to a
CPU’s thermal diode, it is necessary to provide a common ground. Also, it is usually necessary to bias
the appropriate CPU Vcc plane above this common ground to avoid forward-biasing the ESD diodes
with the temperature sensor signals. Test point TP3, 8, 10, or 11 provides a ground connection. Consult
the CPU manufacturer’s datasheet for guidance on interfacing to the thermal diode. Refer to the
schematic EVB-EMC2101 SCH-7069-REVB1.pdf for details on the EVB header connections.
Resistance Error Correction (REC)
The remote diode DN signal path has a 100 ohm series resistor to demonstrate the EMC2101’s REC
feature. The resistor may be effectively removed from the circuit by installing a jumper on JP7 or JP13
3.6
3.7
Power Source
This EVB requires only a USB cable. The USB-SMBus bridge regulates the +5V USB power to +3.3V
used by the EMC2101 and other EVB ciruitry such as the fan and resistive heater.
Test Points
Test points are provided for:
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Ground
+3.3V power
+5V_USB power
FAN pin output
ALERT output
TACH for 3 wire fan (included)
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3.8
LED Indicators
Table 3.1 LED Status Indicators
LED
SIGNAL
OFF
GREEN
RED
LED1
LED2
LED3
ALERT
+3.3V
+3.3V power OFF
+3.3V power OFF
No ALERT
ALERT
NA
+3.3V power ON
Bridge Activity
NO Activity on
USB/SMBus Bridge
Activity on
USB/SMBus Bridge
NA
LED4
LED5
USB Activity
NO Activity on USB port
U10 power OFF
Activity on USB port
U10 power ON
NA
NA
EMC2101
Power
LED6
EMC2101-R
Power
U11 power OFF
U11 power ON
NA
3.9
Jumper Settings
This EVB has many jumper configurations to evaluate all of the features of the EMC2101.
3.9.1
Device Power
To enable one of the 2 devices on the EVB, use jumpers J2 and J3. When a device is selected, the
appropriate LED will light as shown in Table 3.1. Table 3.2 below summarizes the options. Note: only
one device may be active at a time as both devices have the same SMBus address.
Table 3.2 Device Power
JUMPER
NAME
POSITION 1-2
POSITION 2-3
J2
J3
EMC2101 POWER
U10 power ON
U11 power ON
U10 power OFF
U11 power OFF
EMC2101-R POWER
3.9.2
Fan Control
To adjust the fan control circuit one 3-way jumper is used. The two settings are DAC mode and PWM
mode. The default setting is PWM which requires the fan to be connected to FAN CONN. 1 and the
JP8 shorted from pin 1-2.
If the linear DAC mode is desired, several things need configured. First, JP8 must be shorted from pin
2-3 and the fan must be connected to FAN CONN. 2. Then, the device must be configured for linear
Table 3.3 Fan Driver Configuration
FAN DRIVER
CONFIGURATION
JP8
FAN CONNECTOR
PWM
DAC
Position 1-2
Position 2-3
P9
P5
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3.9.3
Remote Diode
The remote diode on board the EMC2101 EVB has a heater and an optional in-line series resistance
adjustment. Checking the REC feature of the EMC2101 is accomplished by removing the jumper on
JP7. This adds 100 ohms of series resistance to the DN line of the diode connection. To return to 0
ohm series resistance, replace the jumper on JP7.
To heat the diode, place a jumper on JP10. To return to ambient conditions, remove JP10. These
Table 3.4 Remote Diode Settings
JUMPER
NAME
OPEN
SHORT
JP7
REC
Q11 - 100 ohms in
DN line (diode remote -)
Q11 - 0 ohms in
DN line (diode remote -)
JP13
JP10
REC
Q12 - 100 ohms in
DN line (diode remote -)
Q12 - 0 ohms in
DN line (diode remote -)
HEATER
Ambient temp on remote diode
(Q12)
1.0W resistive heater on remote diode (Q12)
both jumpers on JP8. Then connect Pin 1 to the ‘remote+’ terminal of the remote diode and Pin 3 to
the ‘remote-‘ terminal of the remote diode. Make sure a common ground exists between the remote
diode (GPU, etc.) and the EMC2101 EVB. Also ensure that the remote diode is properly biased
according to the diode manufacture.
Table 3.5 Remote Diode Configurations
CONFIGURATION
JUMPER
PIN 1
PIN 2
PIN 3
PIN 4
On-board diode (Q11)
JP9
JP9
short / DP
remote + / DP
short / DN
remote - / DN
Off-board diode (CPU,
GPU, etc.)
open
open
On-board diode (Q12)
JP12
JP12
short / DP
remote + / DP
short / DN
remote - / DN
Off-board diode (CPU,
GPU, etc.)
open
open
A unique feature of the EMC2101-R device is the ability to start in one of several different
configurations based on the pull up resistor on the ALERT output. The EVB allows the user to quickly
load via EEPROM, ensure that the Autorefresh Registers is not selected until the loading is complete
(less than 1 sec).
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NOTE: Only one jumper is to be installed on JP11 and a minimum of one jumper must be installed
for the device to operate.
Table 3.6 ALERT Pull-up Resistors - SMBus/FAN MODE
JUMPER
NAME
OPEN
SHORT
JP11
33k
NA
Auto load via EEPROM -
Initial FAN 0% Duty Cycle
18k
10k
5.6k
NA
NA
NA
Auto load via EEPROM -
Initial FAN 100% Duty Cycle
Host load via SMBus -
initial FAN 0% Duty Cycle
Host load via SMBus -
initial FAN 100% Duty Cycle
3.10
Other Sensor Features
Other features such as Ideality Factor Configuration, Conversion Rate, Digital Filtering, Look-up Table
Functionality, and Standby Mode can be controlled with EMC2101 registers. See the datasheet register
description for details.
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4 Software Description
4.1
Chip Manager Overview
The Chip Manager application (ChipMan) initially displays the main Help screen, where detailed
description of the application’s features may be found. The Help screens can be displayed at any time
by selecting Help from the menu bar. ChipMan enables the user to display temperature readings, set
temperature limits and read/write configuration register values.
4.2
Temperature/Register History Graph
To open a Temperature or Register History Graph window, select the register or registers to plot in the
ChipMan application. then select Options -> Plot Register Data from the menu bar. Once the graph
appears, select Control -> Start to begin plotting data. The history plot continuously updates the
external diode starting at room temp and then being heated using the HEATER jumper (JP2).
Figure 4.1 EMC2101 Temperature History Graph
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