KTGM45 Users Guide
KTD-N0793-L
Page 50
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
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
Connector
