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ADM1031 Datasheet(PDF) 27 Page - Analog Devices

Part # ADM1031
Description  Intelligent Temperature Monitor and Dual PWM Fan Controller
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADM1031 Datasheet(HTML) 27 Page - Analog Devices

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REV. 0
ADM1031
–27–
Table XXI. Register 0x22 Fan Speed Config Register Power-On Default = 55H
Bit
Name
R/
W
Description
<3:0>
Normal/Min Spd 1
Read/Write
This nibble contains the normal speed value for Fan 1. When in Automatic
Fan Speed Control Mode, this nibble contains the minimum speed at which
Fan 1 will run. Default is 0x05 for 33% PWM duty cycle.
<7:4>
Normal/Min Spd 2
Read/Write
This nibble contains the normal speed value for Fan 2. When in Automatic
Fan Speed Control Mode, this nibble contains the minimum speed at which
Fan 2 will run. Default is 0x05 for 33% PWM duty cycle.
Table XXII. Register 0x23 Fan Filter Register Power-On Default = 50H
Bit
Name
R/
W
Description
<7>
Spin-Up Disable
Read/Write
When set to 1, disables fan spin-up.
<6:5>
Ramp Rate
Read/Write
These bits set the ramp rate.
00 = 1
01 = 2
10 = 4 (Default)
11 = 8
<4:2>
ADC Sample Rate
Read/Write
These bits set the sampling rate for the ADC.
000 = 87.5 Hz
001 = 175 Hz
010 = 350 Hz
011 = 700 Hz
100 = 1.4 kHz (Default)
101 = 2.8 kHz
110 = 5.6 kHz
111 = 11.2 kHz
<1>
Fan 2 Filter En
Read/Write
This bit enables fan filtering for Fan 2.
<0>
Fan1 Filter En
Read/Write
This bit enables fan filtering for Fan 1.
Table XXIII. Register 0x24 Local Temp TMIN/TRANGE Power-On Default = 41H
Bit
Name
R/
W
Description
<7:3>
Local Temp TMIN
Read/Write
Contains the minimum temperature value for Automatic Fan Speed Control
based on Local Temperature Readings. TMIN can be programmed to positive
values only in 4
°C increments. Default is 32°C.
00000 = 0
°C
00001 = 4
°C
00010 = 8
°C
00011 = 12
°C
|
|
01000 = 32
°C (Default)
|
|
|
11110 = 120
°C
11111 = 124
°C
<2:0>
Local Temp TRANGE
Read/Write
This nibble contains the temperature range value for Automatic Fan Speed
Control based on the Local Temp Readings.
000 = 5
°C
001 = 10
°C (Default)
010 = 20
°C
011 = 40
°C
100 = 80
°C



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