ADT7462ACPZ-R7 datasheet(69/81 Pages) ONSEMI

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ADT7462

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Table 58. Register 0x21, Register 0x22, Register 0x23, Register 0x24 — PWM1, PWM2, PWM3 and PWM4

Configuration Registers

Bit

Name

R/W

Description

[2:0]

Spin−Up

Timeout

R/W

These bits set the duration of the fan startup timeout and the timeout for the fan freewheeling

test.

000 = No startup timeout

001 = 100 ms

010 = 250 ms

011 = 400 ms

100 = 667 ms

101 = 1 sec

110 = 2 sec

111 = 32 sec

SLOW

R/W

Setting this bit to 1 makes the ramp rate of the enhance acoustics mode four times longer.

INV

R/W

Setting this bit to 0, the PWM outputs are active low. Setting this bit to 1, the PWM outputs are

active high (default).

[7:5]

BHVR

R/W

These bits determine which temperature channel controls the fans in the automatic fan speed

control loop.

000 = Local temperature

001 = Remote 1 temperature

010 = Remote 2 temperature

011 = Remote 3 temperature

100 = Off

101 = Maximum fan speed calculated by the local and Remote 3 temperature channels

110 = Maximum fan speed calculated by all four channels

111 = Manual mode

Table 59. Register 0x25 — PWM1, PWM2 Frequency (Note 1)

Bit

Name

R/W

Description

Min 1

R/W

When the ADT7462 is in automatic fan control mode, this bit defines whether PWM1 is off

(0% duty cycle) or at minimum PWM1 duty cycle when the controlling temperature is below its

TMIN − hysteresis value.

0 = 0% duty cycle below TMIN − hysteresis (default); 1 = minimum PWM1 duty cycle below

TMIN − hysteresis.

Min 2

R/W

When the ADT7462 is in automatic fan control mode, this bit defines whether PWM2 is off

(0% duty cycle) or at minimum PWM2 duty cycle when the controlling temperature is below its

TMIN − hysteresis value.

0 = 0% duty cycle below TMIN − hysteresis (default); 1 = minimum PWM2 duty cycle below

TMIN − hysteresis.

[4:2]

Low Freq 1

R/W

These bits set the frequency of PWM1 when configured in low frequency mode.

000 = 11 Hz

001 = 14.7 Hz

010 = 22.1 Hz

011 = 29.4 Hz

100 = 35.3 Hz (default)

101 = 44.1 Hz

110 = 58.8 Hz

111 = 88.2 Hz

[7:5]

Low Freq 2

R/W

These bits set the frequency of PWM2 when configured in low frequency mode.

000 = 11 Hz

001 = 14.7 Hz

010 = 22.1 Hz

011 = 29.4 Hz

100 = 35.3 Hz (default)

101 = 44.1 Hz

110 = 58.8 Hz

111 = 88.2 Hz

1. POR = 0x90, Lock = Y, SW Reset = Y.

ADT7462ACPZ-R7 数据表(PDF) 69 Page - ON Semiconductor

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