User`s guide

Hardware Components
22 M1 System Management Board User’s Guide
Dummy Loads
Dummy loads can be connected to the output voltages to demonstrate the capability of the M1AFS1500-FG484 device
to monitor current in the absence of an external daughter board. Connect the dummy loads as shown in Table 2-15.
Temperature Diodes
Five temperature diodes (MMBT3904) are provided across the board for monitoring environment temperature: heater,
regulators, board, PCI, and copper pad.
Heater
Temperature diode Q10 is located very close to the heater element, R161, and monitors the temperature of the heater.
The red LED, D22, can be used to toggle if the temperature crosses some threshold.
Regulators
Temperature diode Q7 is located in the middle of all the LDO regulators to monitor the temperature. The red LED
D19 can be used to toggle if the temperature crosses some threshold.
Board
Temperature diode Q1 is located beneath the LCD display to monitor average board temperature. The red LED D1 can
be used to toggle if the temperature crosses some threshold.
PCI
A two-pin header, JP19, is located between the two PCI connectors. Attach a two-pin cable with a temperature-sensing
device to this connector to monitor temperature of the PCI card. The red LED D30 can be used to toggle if the
temperature crosses some threshold.
Copper Pad
Temperature diode Q16 is located next to the exposed copper area to monitor the temperature of the exposed copper
pad. This pad will be used for calibration purposes to record a stable room temperature. The red LED D34 can be used
to toggle if the temperature crosses some threshold.
Potentiometer
A 2-kΩ potentiometer (R150) is provided with a control knob to demonstrate voltage monitoring by exercising an AV
pad on the M1AFS1500-FG484 device. The potentiometer is connected across a 5 V signal. The voltage strobe moves
Table 2-15 · Dummy Loads Settings
Reference
Designator
Load Output Voltage
Approximate
Current
JP32 110 Ω 12 V 109 mA
JP33 39 Ω 5 V 128 mA
JP34 39 Ω 3.3 V 84 mA