Fan Connectors (Internal); Figure 9: 4-Pin Fan Connector - Kontron mITX-SKL-S-H110 User Manual

6.6. Fan Connectors (internal)

The FANSYS (SYS_FAN) can be used to power, control and monitor a fan for chassis ventilation etc.
The FANCPU (CPU_FAN) is used for the connection of the FAN for the CPU.
The 4-pin header is recommended to be used for driving 4-wire type Fan in order to implement FAN speed control.

Figure 9: 4-pin Fan Connector

Pin Signal
1 TACHO
2 PWM
3 12 V
4 GND
Signal Description
GND Power Supply GND signal
12 V +12 V supply for fan. A maximum of 2000 mA can be supplied from this pin.
TACHO
Tacho input signal from the fan, for rotation speed supervision RPM (Rotations
Per Minute).
PWM PWM output signal for FAN speed control.
Description
FAN speed sense
FAN speed control
Power +12 V
Ground
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