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ADM1029ARQZ-R7 数据表(PDF) 44 Page - ON Semiconductor

部件名 ADM1029ARQZ-R7
功能描述  Dual PWM Fan Controller and Temperature Monitor for High Availability Systems
PDF  50 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

ADM1029ARQZ-R7 数据表(HTML) 44 Page - ON Semiconductor

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Register 68h, 69h – Fan x
* Configuration (Power-On Default 2Fh)
Bit
Name
R/W
Description
<3:0>
Fan x
* Hot-Plug Speed
R/W
This nibble contains the Hot-Plug speed value for Fan x
*. This is the speed
the other fan(s) runs at if Fan x
* is Hot-Plug removed. If a fan is Hot-Plug
installed, it will run at Normal Speed.
<5:4>
PWM Frequency
R/W
These bits allow programmability of the Nominal PWM Frequency for
Fan x
*. The following options are supported:
Bits 5–4
PWM Freq
00
15.625 Hz
01
62.5 Hz
10
250 Hz – Default
11
1000 Hz
<7:6>
Oscillator Frequency
R/W
These bits contain the oscillator frequency for the Fan x
* tach measurement.
If set to 00, tach measurement is disabled for Fan x
*.
Bit 7
Bit 6
Oscillator Frequency (Hz)
0
0
Measurement disabled
0
1
470
1
0
940
1
1
1880
*“x” denotes the fan number. Register 68h is for FAN 1 and 69h is for FAN 2.
Register 70h, 71h – Fan x
* Tach Value (Power-On Default 00h)
Bit
Name
R/W
Description
<7:0>
Fan x
* Tach Value
R
This register contains the value of the Fan x
* tachometer measurement.
*“x” denotes the fan number. Register 70h is for FAN 1 and 71h is for FAN 2.
Register 78h, 79h – Fan x
* Tach High Limit (Power-On Default FFh)
Bit
Name
R/W
Description
<7:0>
Fan x
* Tach High Limit
R/W
This register contains the limit value for the Fan x
* tachometer measure-
ment. Since the tachometer circuit counts between tach pulses, a slow fan will
result in a larger measured value, so exceeding the limit is the way to detect a
slow or stopped fan.
*“x” denotes the fan number. Register 78h is for FAN 1 and 79h is for FAN 2.
ADM1029



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