mITX-HSW-S - User Guide, Rev. 1.1
// 40
7.2.
Fan Wafers (FAN1 & FAN2)
The CPU FAN Wafer (FAN2) is used for the connection of the FAN for the CPU while the System FAN Wafer (FAN1) for
the connection of the FAN for the system.
Figure 18: Fan Wafer FAN1, FAN2
Table 25: Pin Assignment FAN1, FAN2
Pin
Signal
Description
1
GND
Ground
2
+12V
Power +12 V
3
SENSE
Sense signal
3
PWM
PWM output
Table 26: Signal description
Signal
Description
GND
Power Supply GND signal
+12V
+12V supply for fan
SENSE
Sense input signal from the fan, for rotation speed supervision RPM (Rotations Per Minute).
The signal shall be generated by an open collector transistor or similar.
PWM
PWM output signal for FAN speed control
1
4
