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KTD-N0882-H Page 40 Internal Connectors

KTQ87/KTH81 Users Guide

7.3 Fan Connectors (CPU_Fan, SYS_Fan1, SYS_Fan2)

The SYS_FAN1 and SYS_Fan2 can be used to power, control and monitor fans for chassis ventilation etc.

The CPU_Fan is used for the connection of the FAN included in active CPU coolers.

The 4pin header is recommended to be used for driving 4-wire type Fan in order to implement FAN speed

control. 3-wire Fan support is also possible, but no fan speed control is integrated.

4-pin Mode:

3-pin Mode:

Signal Description

PWM PWM output signal for FAN speed control.

TACHO Tacho input signal from the fan, for rotation speed supervision RPM (Rotation Per Minute). The

signal 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 and onboard circuit is prepared for two pulses

per rotation.

12V +12V supply for fan. A maximum of 2000mA can be supplied from this pin.

GND Power Supply GND signal

Header Pin Signal Description Type

1 PWM PWM output O-3.3

2 TACHO Tacho signal I

12V

Power +12V

PWR

4 GND Ground PWR

Header Pin Signal Description Type

1 Not used

2 TACHO Tacho signal I

3 12V Power +12V PWR

4 GND Ground PWR

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