Kontron KTHM76-mITX - Manual (Page 38)

KTQM77 – KTHM76 Users Guide
KTD-N0850-F Page 38
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 Pull
U/D
Note
1 CONTROL O - -
2 SENSE I - 4K7
3 +12V PWR - -
4 GND PWR - -
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 Pull
U/D
Note
-
2 SENSE I - 4K7
3 +12V PWR - -
4 GND PWR - -
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
Internal Connectors