EVB-EMC1043C SMSC, EVB-EMC1043C Datasheet - Page 8

• Manufacturer Part Number: EVB-EMC1043C
• Description: MCU, MPU & DSP Development Tools EMC1043 Temp Sensor Eval Board
• Manufacturer: SMSC

Specifications of EVB-EMC1043C

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 1.1 (12-14-06)
3.5
3.6
3.7
3.8
3.9
3.10
Resistance Error Correction (R.E.C.)
Power Source
Direct SMBus Connect Option
Test Points
LED Indicators
Other Sensor Features
The Beta Compensation function is designed for CPU substrate diodes and is not compatible with
diode-connected transistors such as the 2N3904. For this reason, the EMC1043 default settings are
over-ridden by the Register Manager’s initialization code so that Beta Compensation is disabled.
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. Headers P2 and P3 provide a ground connection
and a pin with a small bias voltage (0.2 to 0.3V) that may be helpful when interfacing to a CPU. Consult
the CPU manufacturer’s datasheet for guidance on interfacing to the thermal diode. Refer to the
schematic SCH-7040_B0.pdf for details on the EVB header connections.
The Remote2 diode DP signal path has a series resistor to demonstrate the EMC1043/1063’s R.E.C.
feature. The resistor may be effectively removed from the circuit by installing a jumper on JP1. See
the Jumper Settings and Connection List for details on jumper settings.
This demo board derives +5V power from the USB port. The bridge microcontroller has an internal
voltage regulator that supplies +3.3V to the EMC1043/1063 and other EVB circuits.
It is also possible to connect an external SMBus master to the EMC1043/1063 EVB. A few
modifications to the circuit are required:
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Test points are provided for:
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LEDs indicate the status of the following signals:
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Other features such as Ideality Factor Configuration, Conversion Rate, Dynamic Averaging, Hottest of
2 Zones and Standby Mode can be controlled with EMC1043/1063 registers. See the datasheet
register description for details.
Cut 3 traces connecting JP4 pins 3-4, 5-6 and 7-8 on the bottom side of the PCB. This will
disconnect the USB bridge from the SMBus. The pullup resistors for the SMBus SDA, and SCL
signals are also disconnected so external pullups will need to be supplied by the SMBus Master.
Install P1 or JP4 to provide an SMBus connector. See the Jumper Settings and Connection List
for details.
Optionally remove zero ohm resistor R31. When removed, the USB to SMBus bridge will not supply
+3.3V to the circuitry so power will need to be provided from an external source. If R31 is left
installed, power will be supplied from the USB connector when connected to a computer or USB
hub.
Ground
+3.3V power
+5V_USB power
+3.3V
USB Activity - blinking indicates USB traffic
Bridge Activity, when ON indicates the Bridge is functioning
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EVB-EMC1043C/1063C User Manual
SMSC EMC1043/1063