ASC7611 ETC2 [List of Unclassifed Manufacturers], ASC7611 Datasheet - Page 23

• Manufacturer Part Number: ASC7611
• Description: HARDWARE MONITOR WITH INTEGRATED FAN CONTROL
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

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