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KTD-N0903-C
Fan for SOC and System (Fan SOC – J29, Fan Sys – J28)
7.4
The Fan SOC is used for the connection of the FAN included in active SOC cooler.
The Fan Sys can be used to power, control and monitor fan for chassis ventilation etc.
Header
Signal
Description
PWM
PWM output signal for FAN speed control.
TACHO
Tacho input signal from the fan, for rotation speed supervision RPM (Rotation Per Minute). The
signal shall be generated by an open collector transistor or similar. Onboard is a pull-up
resistor 4K7 to +12V. The signal has to be pulsed and onboard circuit is prepared for two pulses
per rotation.
12V
+12V supply for fan. A maximum of 500mA can be supplied from this pin.
GND
Power Supply GND signal
Page 25
Pin
Signal
1
GND
2
12V
3
TACHO
4
PWM
mITX-E38 Users Guide
Internal Connectors
Description
Type
Ground
PWR
AI
Tacho signal
I
PWM output
O-3.3
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