Fan Connectors (Cpu_Fan1) And (Sys_Fan1) - Kontron KTQ87/mITX User Manual

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KTD-N0882-D

6.2 Fan Connectors (CPU_FAN1) and (SYS_FAN1)

The CPU_FAN1 is used for the connection of the FAN for the CPU.
The SYS_FAN1 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 32
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
-
-
-
-
KTQ87/mITX Users Guide

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