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KTD-N0793-0
3.13
Fan Connector (FAN_CPU)
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. Onboard 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. Onboard 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 47
Signal
Type
Ioh/Iol
CONTROL
O
SENSE
I
+12V
PWR
GND
PWR
Signal
Type
Ioh/Iol
SENSE
I
+12V
PWR
GND
PWR
KTGM45 Users Guide
Connector Definitions
Pull
Note
U/D
-
-
-
4K7
-
-
-
-
Pull
Note
U/D
-
4K7
-
-
-
-
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