參數(shù)資料
型號(hào)： AMC6821SDBQ
英文描述： Analog Monitor and Control Circuit
中文描述： 模擬監(jiān)視和控制電路
文件頁(yè)數(shù)： 17/47頁(yè)
文件大小： 547K
代理商： AMC6821SDBQ
www.ti.com
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FAN FAILURE DETECTION
When the TACH data are larger than the TACH low limit, the fan runs at a speed below the predefined minimum
RPM. When this condition occurs, a spin-up process is applied to start the fan again when spin-up is enabled.
Bits [STIME2:STIME0] of the
Fan Characteristics Register
define this time period.
Figure 10
shows the function
of the fan failure detection.
During Spin-Up Process
Normal Operation of Fan Failure
Detection and Spin-Up
Bit FANS = 0
Clear Spin-Up
Time Counter
TACH Data > Low Limit
Measure RPM
Yes
Yes
No
No
No
No
Yes
Yes
No Spin-Up if Disabled
Bit FANS = 1
Spin-Up Time Count +1
Spin-Up Process
Spin-Up Time Count
5
3
Fan failure,
FAN-FAULT
pin
goes low.
Spin-Up Disabled
Measure the RPM continuously once every 0.25s (TACH-FAST
even after a fan failure. However, there are no FANS detections during spin-up.
The
pin is negated if the fan returns to a normal RPM range.
FAN-FAULT
= 1) or 1s
bit
(TACH-FAST = 0),
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
The fan speed is measured immediately after spin-up and the TACH-FAST bit of
Configuration Register 4
determines the monitoring rate. If the fan does not return to a normal range after five consecutive spin-ups, a
FAN-FAILURE occurs, the FAN-FAULT pin goes low when it is enabled (the FAN-FAULT-EN bit of
Configuration
Register 1
is set), and the spin-up process continues. If the fan returns to a normal speed range before the fifth
spin-up, the FAN-FAULT pin does not go low even though the FANS bit is still set to '1'. No FANS (fan-slow)
detections are performed during spin-up.
Figure 10. Fan Failure Detection and Spin-Up
17
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