ADT7467ARQZ-R7 datasheet(74/77 Pages) ONSEMI

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ADT7467

Rev. 3 | Page 74 of 77 | www.onsemi.com

Table 56. Register 0x79—THERM Timer Status Register (Power-On Default = 0x00)

Bit

Name

R/W

Description

<7:1>

TMR

Read only

Times how long THERM input is asserted. These seven bits read 0 until the THERM assertion time exceeds 45.52 ms.

<0>

ASRT/TMR0

Read only

This bit is set high upon the assertion of the THERM input and is cleared upon a read. If the THERM assertion time

exceeds 45.52 ms, this bit is set and becomes the LSB of the 8-bit TMR reading. This allows THERM assertion times

from 45.52 ms to 5.82 sec to be reported back with a resolution of 22.76 ms.

Table 57. Register 0x7A—THERM Timer Limit Register (Power-On Default = 0x00)

Bit

Name

R/W

Description

<7:0>

LIMT

Read/write

Sets the maximum THERM assertion length before an interrupt is generated. This is an 8-bit limit with a

resolution of 22.76 ms, allowing THERM assertion limits of 45.52 ms to 5.82 sec to be programmed. If the THERM

assertion time exceeds this limit, Bit 5 (F4P) of Interrupt Status Register 2 (0x42) is set. If the limit value is 0x00, an

interrupt is generated immediately upon the assertion of the THERM input.

Table 58. Register 0x7B—TACH Pulses per Revolution Register (Power-On Default = 0x55)

Bit

Name

R/W

Description

<1:0>

FAN1

Read/write

Sets the number of pulses to be counted when measuring Fan 1 speed. Can be used to determine fan pulses per

revolution for an unknown fan type.

Pulses Counted

00 = 1

01 = 2 (default)

10 = 3

11 = 4

<3:2>

FAN2

Read/write

Sets the number of pulses to be counted when measuring Fan 2 speed. Can be used to determine fan pulses per

revolution for an unknown fan type.

Pulses Counted

00 = 1

01 = 2 (default)

10 = 3

11 = 4

<5:4>

FAN3

Read/write

Sets the number of pulses to be counted when measuring Fan 3 speed. Can be used to determine fan pulses per

revolution for an unknown fan type.

Pulses Counted

00 = 1

01 = 2 (default)

10 = 3

11 = 4

<7:6>

FAN4

Read/write

Sets the number of pulses to be counted when measuring Fan 4 speed. Can be used to determine fan pulses per

revolution for an unknown fan type.

Pulses Counted

00 = 1

01 = 2 (default)

10 = 3

11 = 4

Table 59. Register 0x7C—Configuration Register 5 (Power-On Default = 0x00)

Bit

Name

R/W1

Description

<0>

Twos Compl

Read/write

Twos Compl = 1 sets the temperature range to twos complement temperature range.

Twos Compl = 0 changes the temperature range to Offset 64. When this bit is changed, the ADT7467 interprets all

relevant temperature register values as defined by this bit.

<1>

LF/HF

Read/write

Sets the PWM drive frequency to high frequency mode (0) or low frequency mode (1).

<2>

GPIOD

Read/write

GPIO direction. When GPIO function is enabled, this determines whether the GPIO is an input (0) or an output (1).

<3>

GPIOP

Read/write

GPIO polarity. When the GPIO function is enabled and programmed as an output, this bit determines whether the

GPIO is active low (0) or high (1).

<4:7>

RES

Read/write

Unused.

1 This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.

ADT7467ARQZ-R7 Datasheet(PDF) 74 Page - ON Semiconductor

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