ASC7611 Datasheet, PDF (23/40 Pages) List of Unclassifed Manufacturers – HARDWARE MONITOR WITH INTEGRATED FAN CONTROL

aSC7611
Fan Temp Limit
less Hysteresis
Hysteresis
(0 °C to 15 °C)
Maximum
PWM %
Fan
Speed
Fan Set to
Minimum
Fan Set to Off
Temperature
Fan Temp
Limit
Fan Temp Limit
plus Range
Range
(2 °C to 80 °C)
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Absolute
Limit
Hysteresis
(0 °C to 15 °C)
PWM set to Off
Linear Control Range
PWM 100%
Figure 8 Fan Control with Absolute Limit Set above Fan Temp Limit Plus Range
No
Min Speed
or Spin-Up
Time Met? _Yes
End Polling
Cycle
End Fan
Spin Up
Begin Polling
Cycle
Fan
Spinning
Yes
Up?
No
Override PWM
Output to 100%
Temp >=
Yes
AbsLimit?
No
Below
No
Hysteresis?
Yes
PWM=
Yes
100%?
No
PWM=
<Max PWM _No
Yes
Temp >=
No
Limit?
Set Fan Output
to 100%
Begin Fan
Spin up
Yes
Fan
Output at
Yes
0%?
No
Set fan speed
based on Auto Fan
Range Algorithm
Auto Fan Mode
Initiated
Set Fan Output
to Max PWM
No
Off /
(off)
Min set
to 1?
Yes
(Minimum Speed)
Set Fan Output
to 0%
Set fan output
to auto fan mode
minimum speed
No
Below
Hysteresis?
Yes
Fan
No
Output
At 0%?
Yes
© Andigilog, Inc. 2006
Figure 9 Automatic Fan Control Algorithm
- 23 -
www.andigilog.com
October 2006 - 70A05007