TC654 datasheet(18/36 Pages) MICROCHIP

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TC654/TC655

DS21734A-page 18

 2002 Microchip Technology Inc.

6.2

FAN_FAULT1 & FAN_FAULT2

Threshold Registers

(FAN_FAULT1 & FAN_ FAULT2)

The Fan Fault Threshold Registers (FAN_FAULT1 and

FAN_ FAULT2) are used to set the fan fault threshold

levels for fan 1 and fan 2, respectively. The Fan Fault

Registers are 8-bit, read/writable registers that allow

the fan fault RPM threshold to be set in 50 RPM incre-

ments. The default setting for both Fan Fault registers

is 500 RPM (0000 1010). The maximum set point

value is 12750 RPM. If the measured fan RPM (stored

in RPM1 and RPM2 Registers) drops below the value

that is set in the Fan Fault Registers for more than

2.4sec, a fan fault indication will be given. F1F (bit

0<0>) and F2F (bit 1<0>) in the Status Register indi-

cate fan fault conditions for fan 1 and fan 2, respec-

tively. The FAULT output will also be pulled low in a fan

fault condition. Changing FFCLR (bit 7<0>) in the Con-

figuration Register will reset the fan fault bits in the Sta-

tus Register as well as the FAULT output. See

format.

FAN FAULT THRESHOLD REGISTERS (FAN_FAULT1 & FAN_FAULT2)

D(7)

D(6)

D(5)

D(4)

D(3)

D(2)

D(1)

D(0)

RPM

000

100

...

111

12700

111

12750

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