ADT7490ARQZ-R7 datasheet(58/75 Pages) ONSEMI

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ADT7490

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Table 49. Register 0x5F, Register 0x60, and Register 0x61 — Remote 1 TRANGE/PWM1 Frequency,

Local TRANGE/PWM2 Frequency, and Remote 2 TRANGE/PWM3 Frequency (Power−On Default = 0xC4)

Bit No.

Mnemonic

R/W (Note 1)

Description

[2:0]

FREQ

R/W

These bits control the PWMx frequency (only apply when PWM channel is in low frequency

mode).

Bit Code

Frequency

000

001

010

011

100

101

110

111

11.0 Hz

14.7 Hz

22.1 Hz

29.4 Hz

35.3 Hz (default)

44.1 Hz

58.8 Hz

88.2 Hz

[3]

HF/LF

R/W

HF/LF = 1, high frequency PWM mode is enabled for PWMx.

HF/LF = 0, low frequency PWM mode is enabled for PWMx.

[7:4]

RANGE

R/W

These bits determine the PWM duty cycle vs. the temperature range for automatic fan

control.

Bit Code

Temperature

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

2°C

2.5°C

3.33°C

4°C

5°C

6.67°C

8°C

10°C

13.33°C

16°C

20°C

26.67°C

32°C (default)

40°C

53.33°C

80°C

1. This register becomes read-only when the Configuration Register 1 (0x40) LOCK bit is set. Any further attempts to write to this register

have no effect.

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