Fan Connectors (Fan_Cpu) (J28) And (Fan_Sys) (J29) - Kontron KTQM67/mITX User Manual

KTD-N0819-K

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
1
2
3
4
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
-
2
3
4
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
Page 44
Signal Type Ioh/Iol
CONTROL O
SENSE I
+12V PWR
GND PWR
Signal Type Ioh/Iol
SENSE I
+12V PWR
GND PWR
Internal Connectors
Pull
Note
U/D
- -
- 4K7
- -
- -
Pull
Note
U/D
- 4K7
- -
- -
KTQM67 Users Guide