f75387 Feature Integration Technology Inc., f75387 Datasheet - Page 30

• Manufacturer Part Number: f75387
• Description: ?1o C Accuracy H/w Monitor Ic With Automatic Fan Speed Control
• Manufacturer: Feature Integration Technology Inc.

Power-on default [7:0] =0000_1010b
Power-on default [7:0] =1001_0100 b
Power-on default [7:0] =0000_0111 b
8.19. Fan Fault Time Register -- Index 61h
8.20. Boundary Hysteresis Register -- Index 62h
7-6
5-4
3-0
8.21. Fan Full Time Register -- Index 63h
Bit
5-0
Bit
7
6
FAN2_T_SEL
FAN1_T_SEL
F_FAULT_TIME
FAN2_DEB
FAN1_DEB
Name
Name
HYS
Attribute
Attribute
R/W
R/W
R/W
R/W
R/W
R/W
0: FAN2 de-bounce circuit is 1.28ms
1: FAN2 de-bounce circuit is 640us.
0: FAN1 de-bounce circuit is 1.28ms
1: FAN1 de-bounce circuit is 640us.
This register determines the time of fan fault. The condition to cause fan fault
event is:
When PWM_Duty reaches FFh, if the fan speed count can’t reach the fan
expect count in time.
The unit of this register is 1 second. The default value is 11 seconds.
(Set to 0 , means 1 seconds. ; Set to 1, means 2 seconds.
Another condition to cause fan fault event is fan stop and the PWM duty is
greater than the minimum duty programmed by the register 69h.
This is the temperature source which FAN2 according to.
00: local temperature.
01: external temperature 1.
10: external temperature 2. (default)
11: disable.
This is the temperature source which FAN1 according to.
00: local temperature.
01: external temperature 1. (default)
10: external temperature 2.
11: disable.
Boundary hysteresis. (0~15 degree C)
Segment will change when the temperature is over the boundary
temperature and below the (boundary – hysteresis ).
Set to 2, means 3 seconds. …. )
28
Description
Description
July, 2007
F75387
0.27P