KTD-N0848-B Page 37
6.2 Fan Connectors (FAN_CPU) (J28) and (FAN_SYS) (J29)
The FAN_CPU is used for the connection of the FAN for the CPU.
The FAN_SYS can be used to power, control and monitor a fan for chassis ventilation etc.
The 4pin header is recommended to be used for driving 4-wire type Fan in order to implement FAN
speed control. 3-wire Fan is also possible, but no fan speed control is integrated.
4-pin Mode:
PIN Signal Type Ioh/Iol
Signal Description
CONTROL PWM signal for FAN speed control
SENSE Tacho signal from the fan for supervision. The signals shall be generated by an open
collector transistor or similar. On-board is a pull-up resistor 4K7 to +12V. The signal has to
be pulsed, typically twice per rotation.
12V +12V supply for fan. A maximum of 2000mA can be supplied from this pin.
GND Power Supply GND signal
3-pin Mode:
PIN Signal Type Ioh/Iol
Signal Description
SENSE Tacho signal from the fan for supervision. The signals shall be generated by an open
collector transistor or similar. On-board is a pull-up resistor 4K7 to +12V. The signal has to
be pulsed, typically twice per rotation.
12V +12V supply for fan. A maximum of 2000mA can be supplied from this pin.
GND Power Supply GND signal
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