pITX-iMX8M – User Guide Rev. 1.4
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6.6.
Fan Connector (internal, J8)
The fan can be used to actively cool the heatsink mounted on the board. The fan rotation speed can be monitored
and the fan speed controlled by the temperature of the PCB (near SoC).
Figure 16: 3-pin Fan Connector
Table 19: Fan Header Mapping
Pin
Function
Direction
Description
1
FAN TACHOIN
IN
Tachometer input from FAN, pulled high to +3.3V
2
+5V FAN
Power
3
RTN 5V
IN
Return path to GND, static low or pulsed
Table 20: Signal Description
Signal
Description
GND
Power Supply GND signal
TACHO
Tacho input signal from the fan, for rotation speed supervision RPM (Rotations
Per Minute).
6.7.
DC Power Supply Connector Options
Either the DC Power Jack Connector (12 Vin Ext.) or the "12 Vin Int." connector must be used to supply the board with
+12 V +/-10 %.
The board can be supplied via the AC/DC adapter plugged into the power jack. Such adapters
have usually no connection to protective earth. Consequently, the potential of the
conductive parts on the board may drift. If a human touches such a part, this may lead to an
electric shock. The board must be grounded separately, if the unit is supplied via power jack.
Hot Plugging power supply is not supported.
Hot plugging might damage the board.
To protect the external power lines of peripheral devices make sure that
the wires have the right diameter to withstand the maximum available current.
to enclosure of the peripheral device fulfills the fire-protecting conditions of
IEC/EN 60950.
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