Datasheet

TC664/TC665
DS21737B-page 18  2002-2013 Microchip Technology Inc.
6.2 FAN_FAULT Threshold Register
(FAN_FAULT)
The FAN_FAULT Threshold Register is used to set the
fan fault threshold level for the fan. The Fan Fault
Threshold Register is an 8-bit read/writable register
that allows the fan fault RPM threshold to be set in 50
RPM increments. The default setting for the Fan Fault
Register is 500 RPM (0000 1010). The maximum set
point value is 12750 RPM.
If the measured fan RPM (stored in the RPM Register)
drops below the value that is set in the Fan Fault Reg-
ister for more than 2.4 sec, FF (bit 0<0>) in the Status
Register will be set to a '1' and the FAULT
output will be
pulled low. See Register 6-2 for the Fan Fault
Threshold Register 8-bit format.
REGISTER 6-2: FAN FAULT THRESHOLD REGISTER (FAN_FAULT)
D(7) D(6) D(5) D(4) D(3) D(2) D(1) D(0) RPM
000000000
0000000050
00000010100
........
........
1111111012700
1111111112750