ADM1027 datasheet(49/56 Pages) AD

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REV. A

ADM1027

–49–

Table XIX. Register 0x63 – Enhance Acoustics Register 2 (Power-On Default = 0x00)

Bit

Name

R/W

Description

<2:0>

ACOU3

Read/Write

These bits select the ramp rate applied to the PWM3 output. Instead of PWM3 jumping

instantaneously to its newly calculated speed, PWM3 will ramp gracefully at the rate

determined by these bits. This effect enhances the acoustics of the fan being driven by the

PWM3 output.

Time slot increase

Time for 33% to 100%

000 = 1

35 sec

001 = 2

17.6 sec

010 = 3

11.8 sec

011 = 5

7 sec

100 = 8

4.4 sec

101 = 12

3 sec

110 = 24

1.6 sec

111 = 48

0.8 sec

<3>

EN3

Read/Write

When this bit is 1, acoustic enhancement is enabled on PWM3 output. When acoustic

enhancement is enabled, fan spin-up time should be disabled.

<6:4>

ACOU2

Read/Write

These bits select the ramp rate applied to the PWM2 output. Instead of PWM2 jumping

instantaneously to its newly calculated speed, PWM2 will ramp gracefully at the rate

determined by these bits. This effect enhances the acoustics of the fans being driven by

the PWM2 output.

Time slot increase

Time for 33% to 100%

000 = 1

35 sec

001 = 2

17.6 sec

010 = 3

11.8 sec

011 = 5

7 sec

100 = 8

4.4 sec

101 = 12

3 sec

110 = 24

1.6 sec

111 = 48

0.8 sec

<7>

EN2

Read/Write

When this bit is 1, acoustic enhancement is enabled on PWM2 output. When acoustic

enhancement is enabled, fan spin-up time should be disabled.

This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register

will have no effect.

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