TC665 Microchip Technology Inc., TC665 Datasheet - Page 18

• Manufacturer Part Number: TC665
• Description: Smbus Pwm Fan Speed Controllers With Fan Fault Detection
• Manufacturer: Microchip Technology Inc.

TC664/TC665
6.2
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.
REGISTER 6-2:
DS21737A-page 18
D(7)
0
0
0
1
1
.
.
FAN_FAULT Threshold Register
(FAN_FAULT)
D(6)
0
0
0
1
1
.
.
FAN FAULT THRESHOLD REGISTER (FAN_FAULT)
D(5)
0
0
0
1
1
.
.
D(4)
0
0
0
1
1
.
.
D(3)
0
0
0
1
1
.
.
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.
Threshold Register 8-bit format.
D(2)
0
0
0
1
1
.
.
See Register 6-2 for the Fan Fault
D(1)
0
0
1
1
1
.
.
2002 Microchip Technology Inc.
D(0)
0
0
0
0
1
.
.
12700
12750
RPM
100
50
0