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ADM1031
Table 23. REGISTER 0X20 FAN CHARACTERISTICS REGISTER 1 POWER-ON DEFAULT = 5DH
Bit
<2:0>
Name
Fan 1 Spin-Up
R/W
R/W
Description
These bits contain the fan spin-up time to allow Fan 1 to overcome its own inertia.
000 = 200 ms
001 = 400 ms
010 = 600 ms
011 = 800 ms
100 = 1 sec
101 = 2 sec (Default)
110 = 4 sec
111 = 8 sec
<5:3>
PWM 1 Frequency
R/W
These bits allow programmability of the nominal PWM 1 output frequency driving Fan 1.
(Default = 31 Hz.)
000 = 11.7 Hz
001 = 15.6 Hz
010 = 23.4 Hz
011 = 31.25 Hz (Default)
100 = 37.5 Hz
101 = 46.9 Hz
110 = 62.5 Hz
111 = 93.5 Hz
<7:6>
Speed Range, N
R/W
Speed range
00 = 1
01 = 2
10 = 4
11 = 8
Table 24. REGISTER 0X21 FAN CHARACTERISTICS REGISTER 2 POWER-ON DEFAULT = 5H
Bit
<2:0>
Name
Fan 2 Spin-Up
R/W
R/W
Description
These bits contain the fan spin-up time to allow Fan 2 to overcome its own inertia.
000 = 200 ms
001 = 400 ms
010 = 600 ms
011 = 800 ms
100 = 1 sec
101 = 2 sec (Default)
110 = 4 sec
111 = 8 sec
<5:3>
PWM 2 Frequency
R/W
These bits allow programmability of the nominal PWM 2 output frequency driving Fan 1.
(Default = 31 Hz.)
000 = 11.7 Hz
001 = 15.6 Hz
010 = 23.4 Hz
011 = 31.25 Hz (Default)
100 = 37.5 Hz
101 = 46.9 Hz
110 = 62.5 Hz
111 = 93.5 Hz
<7:6>
Speed Range, N
R/W
Speed range
00 = 1
01 = 2
10 = 4
11 = 8
Table 25. REGISTER 0X22 FAN SPEED CONFIGURATION REGISTER POWER-ON DEFAULT = 55H
Bit
<3:0>
<7:4>
Name
Normal/Min Spd 1
Normal/Min Spd 2
R/W
R/W
R/W
Description
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 runs. Default is
0x05 for 33% PWM duty cycle.
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 runs. Default is
0x05 for 33% PWM duty cycle.
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