ADM1031 datasheet(26/32 Pages) AD

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ADM1031

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Table XIX. Register 0x20 Fan Characteristics Register 1 Power-On Default = 5DH

Bit

Name

Description

<2:0>

Fan 1 Spin-up

Read/Write

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 secs (Default)

110 = 4 secs

111 = 8 secs

<5:3>

PWM 1 Frequency

Read/Write

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

Read/Write

Speed Range

00 = 1

01 = 2

10 = 4

11 = 8

Table XX. Register 0x21 Fan Characteristics Register 2 Power-On Default = 5DH

Bit

Name

Description

<2:0>

Fan 2 Spin-up

Read/Write

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 secs (Default)

110 = 4 secs

111 = 8 secs

<5:3>

PWM 2 Frequency

Read/Write

These bits allow programmability of the nominal PWM 2 output frequency

driving Fan 2. (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

Read/Write

Speed Range

00 = 1

01 = 2

10 = 4

11 = 8

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