ADT7467ARQZ-R7 datasheet(32/77 Pages) ONSEMI

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ADT7467

Rev. 3 | Page 32 of 77 | www.onsemi.com

Bit 5 (FSPDIS), the functionality of this bit can be changed (see

the Disabling Fan Start-Up Timeout section).

PWM1 Configuration Register (0x5C)

<2:0> SPIN, start-up timeout for PWM1

000 = no start-up timeout

001 = 100 ms

010 = 250 ms default

011 = 400 ms

100 = 667 ms

101 = 1 sec

110 = 2 sec

111 = 4 sec

PWM2 Configuration Register (0x5D)

<2:0> SPIN, start-up timeout for PWM2

000 = no start-up timeout

001 = 100 ms

010 = 250 ms default

011 = 400 ms

100 = 667 ms

101 = 1 sec

110 = 2 sec

111 = 4 sec

PWM3 Configuration Register (0x5E)

<2:0> SPIN, start-up timeout for PWM3

000 = no start-up timeout

001 = 100 ms

010 = 250 ms default

011 = 400 ms

100 = 667 ms

101 = 1 sec

110 = 2 sec

111 = 4 sec

Disabling Fan Start-Up Timeout

Although a fan startup makes fan spin-ups more quiet than

fixed-time spin-ups, users can use fixed spin-up times. Setting

Bit 5 (FSPDIS) to 1 in Configuration Register 1 (0x40) disables

the spin-up for two TACH pulses, and the fan spins up for the

fixed time selected in Register 0x5C to Register 0x5E.

PWM LOGIC STATE

The PWM outputs can be programmed high for 100% duty

cycle (noninverted) or programmed low for 100% duty cycle

(inverted).

PWM1 Configuration Register (0x5C)

<4> INV

0 = logic high for 100% PWM duty cycle

1 = logic low for 100% PWM duty cycle

PWM2 Configuration Register (0x5D)

<4> INV

0 = logic high for 100% PWM duty cycle

1 = logic low for 100% PWM duty cycle

PWM3 Configuration Register (0x5E)

<4> INV

0 = logic high for 100% PWM duty cycle

1 = logic low for 100% PWM duty cycle

Low Frequency Mode PWM Drive Frequency

The PWM drive frequency can be adjusted for the application.

for PWM1 to PWM3, respectively. In high frequency mode, the

PWM drive frequency is 22.5 kHz and cannot be changed.

PWM1 Frequency Registers (0x5F to 0x61)

<2:0> FREQ

000 = 11.0 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

ADT7467ARQZ-R7 Datasheet(PDF) 32 Page - ON Semiconductor

ADT7467ARQZ-R7 Datasheet(HTML) 32 Page - ON Semiconductor

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