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Description
5.6
Local Voltage Rails
Twelve on board voltages are provided for sequencing and monitoring. Each voltage rail has an output on
LED. The nominal output voltages are listed in
Table 5
.
Table 5. Local Rail Nominal Output Voltages
Local Rail
L1
L2
L3
L4
5L
6L
7L
8L
9L
10L
11L
12L
NominalVoltage
3.5V
3.3V
2.5V
1.8V
3.4V
3.2V
3.0V
2.8V
2.6V
2.4V
2.2V
2.0V
5.7
External Temperature Sensor
An onboard temperature sensor is provided to measure temperature rise of the VR1 output load (R74).
MON2 can be used to monitor the temperature rise caused by heat up of R74 when the shunt on J24 is in
the T1 position. When J26 (C1) is installed, the temperature sensor near R74 records temperature rise
simulating power supply warm up.
•
Use TP14 (T1) to measure the temperature sensor output voltage.
•
Temperature (in degrees C) = 100 × VT1 – 50 where VT1 is the voltage at TP14.
•
The voltage at TP14 is scaled by a factor of 2 prior to sampling at MON2.
•
Set the GUI Temp Cal Gain = 200°C/V and the Temp Cal Offset = –50°C.
5.7.1
Basic Process for Adding Temperature Monitoring to a Rail
A basic procedure to add temperature monitoring to rail #1, starting with the EVM default configuration will
follow. Ensure that rail #1 is selected in the upper right corner.
17
SLVU347 – December 2009
Evaluation Module for UCD90120 and UCD90124
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