Cpu / System Fan Wafer (Fan1 & Fan2); Table 19: 4-Pin Mode Fan1, Fan2; Table 20: 3-Pin Mode Fan1, Fan2; Table 21: Signal Description - Kontron mITX-DNV User Manual

7.2. CPU / System Fan Wafer (FAN1 & FAN2)
The CPU Fan Wafer (FAN1) is used for the connection of the Fan for the CPU. The System Fan Wafer (FAN2) can be
used to power, control and monitor a fan for chassis ventilation etc.
The 4-pin wafer is recommended to be used for driving 4-wire type FAN in order to implement FAN speed control. 3-
wire Fan support is also possible, but no fan speed control is integrated.

Figure 11: CPU / System Fan Wafer FAN1, FAN2

Table 19: 4-Pin Mode FAN1, FAN2

Pin Signal
1 GND
2 +12V
3 SENSE
4
PWM

Table 20: 3-Pin Mode FAN1, FAN2

Pin Signal
1 GND
2 +12V
3 SENSE
4 -

Table 21: Signal description

Signal
GND
+12V
SENSE
PWM
www.kontron.com
Description
Ground
Power +12V
Sense signal
PWM output
Description
Ground
Power +12V
Sense signal
Not used
Description
Power Supply GND signal
+12 V supply for fan
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 output signal for FAN speed control
1
4
mITX-DNV - User Guide, Rev. 1.0
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