FlexATX-KBL-S-C236 – Rev. 1.1
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6.5.
Fan Connector (internal, J34, J35)
The FANSYS (SYS_FAN) can be used to power, control and monitor a fan for chassis ventilation etc.
The 4-pin header is recommended to be used for driving 4-wire type fan in order to implement FAN speed control.
Figure 8: 4-pin Fan Connector
Pin
Signal
Description
Type
1
PWM
FAN speed sense
O
2
TACHO
FAN speed control
I
3
12 V
Power +12 V
PWR
4
GND
Ground
PWR
Signal
Description
Type
GND
Power Supply GND signal
PWR
12 V
+12 V supply for fan. A maximum of 2000 mA can be supplied from this pin.
PWR
TACHO
Tacho input signal from the fan, for rotation speed supervision RPM (Rotations
Per Minute).
I
PWM
PWM output signal for FAN speed control.
O
