參數(shù)資料
型號(hào)： ASC7611
廠商： Electronic Theatre Controls, Inc.
英文描述： HARDWARE MONITOR WITH INTEGRATED FAN CONTROL
中文描述： 五金顯示器整合了風(fēng)扇控制
文件頁(yè)數(shù)： 21/40頁(yè)
文件大?。?/td> 505K
代理商： ASC7611
P
P
- 21 -
Andigilog, Inc. 2006
www.andigilog.com
October 2006 - 70A05007
aSC7611
Automatic Fan Control
Auto Fan Control Operating Mode
The aSC7611 includes the circuitry for automatic fan control. In Auto Fan Mode, the aSC7611 will automatically adjust the
PWM duty cycle of the PWM output. PWM outputs are assigned to a thermal zone based on the fan configuration registers.
At any time, the temperature of a zone exceeds its Absolute Limit, all PWM outputs will go to 100% duty cycle to provide
maximum cooling to the system.
Figure 6 Automatic Fan Speed Control Example
Example for PWM1 assigned to Zone 1:
Zone 1 Fan Temp Limit (Register 67h) is set to 50
°
C (32h).
Zone 1 Range (Register 5Fh) is set to 8
°
C (6xh).
Fan PWM Minimum (Register 64h) is set to 50% (80h).
In this case, the PWM duty cycle will be 50% at 50
°
C.
Since (Zone 1 Fan Temp Limit) + (Zone 1 Range) = 50
°
C + 8
°
C = 58
°
C, the fan will run at 100% duty cycle when the
temperature of the Zone 1 sensor reaches 58
°
C.
Since the midpoint of the fan control range is 54
°
C, and the median duty cycle is 75% (Halfway between the PWM Minimum
and 100%), PWM1 duty cycle would be 75% at 54
°
C.
Above (Zone 1 Fan Temp Limit) + (Zone 1 Range), the duty cycle will be 100%.
5 °C
45
Temperature °C
this Temperature
PWM 100%
less Hysteresis
Limit
(0 °C to 15 °C)
Range
(2 °C to 80 °C)
plus Range
Limit
Increasing with Temp
PWM Duty Cycle linearly
PWM Set to Off
Example
58
80
Min%
100%
PWM %
off until it has gone below Fan Temp Limit by the 5 °C Hysteresis setting to 45°C.
Temperature
PWM %
Linear Control Range
Range
Min%
Minimum
100%
0%
50
Minimum or Off
Hysteresis
PWM set to Off or
Minimum Below
Fan Temp Limit
Fan Temp
Hysteresis
Fan Temp Limit
Absolute
PWM Duty Cycle linearly
Increasing with Temp
PWM Duty Cycle linearly
Decreasing with Temp
Minimum PWM set to 50%, fan speed increases linearly beyond 50 °C but will not return to
8 °C
Off/
PWM Set to
User Choice: Set to
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PDF描述
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