ADT7463ARQZ-R7 datasheet(38/52 Pages) ONSEMI

38 / 52 page

REV. C

–38–

ADT7463

Table XII. Register 0x40 – Configuration Register 1 (Power-On Default = 0x00)

Bit

Name

R/W

Description

<0>

STRT

Read/Write

Logic 1 enables monitoring and PWM control outputs based on the limit settings pro-

grammed. Logic 0 disables monitoring and PWM control based on the default power-up

limit settings. Note that the limit values programmed are preserved even if a Logic 0 is

written to this bit and the default settings are enabled. This bit becomes read-only and

cannot be changed once Bit 1 (LOCK bit) has been written. All limit registers should be

programmed by BIOS before setting this bit to 1. (Lockable.)

<1>

LOCK

Write Once

Logic 1 locks all limit values to their current settings. Once this bit is set, all lockable

registers become read-only and cannot be modified until the ADT7463 is powered down

and powered up again. This prevents rogue programs such as viruses from modifying

critical system limit settings. (Lockable.)

<2>

RDY

Read-Only

This bit gets set to 1 by the ADT7463 to indicate that the device is fully powered-up

and ready to begin systems monitoring.

<3>

FSPD

Read/Write

When set to 1, this runs all fans at full speed. Power-on default = 0. This bit does not get

locked at any time.

<4>

V � I

Read/Write

BIOS should set this bit to a 1 when the ADT7463 is configured to measure current

from an ADI ADOPTTM VRM controller and measure the CPU’s core voltage. This

allows monitoring software to display CPU watts usage. (Lockable.)

<5>

FSPDIS

Read/Write

Logic 1 disables fan spin-up for two TACH pulses. Instead, the PWM outputs go high

for the entire fan spin-up timeout selected.

<6>

TODIS

Read/Write

When this bit is set to 1, the SMBus timeout feature is disabled. This allows the

ADT7463 to be used with SMBus controllers that cannot handle SMBus

timeouts. (Lockable.)

<7>

VCC

Read/Write

When this bit is set to 1, the ADT7463 rescales its VCC pin to measure a 5 V supply. If

this bit is 0, the ADT7463 measures VCC as a 3.3 V supply. (Lockable.)

Table XIII. Register 0x41 – Interrupt Status Register 1 (Power-On Default = 0x00)

Bit

Name

R/W

Description

<0>

2.5V

Read-Only

A one indicates the 2.5 V high or low limit has been exceeded. This bit gets cleared on

a read of the status register only if the error condition has subsided.

<1>

VCCP

Read-Only

A one indicates the VCCP high or low limit has been exceeded. This bit gets cleared on

a read of the status register only if the error condition has subsided.

<2>

VCC

Read-Only

A one indicates the VCC high or low limit has been exceeded. This bit gets cleared on a

read of the status register only if the error condition has subsided.

<3>

Read-Only

A one indicates the 5 V high or low limit has been exceeded. This bit gets cleared on a

read of the status register only if the error condition has subsided.

<4>

R1T

Read-Only

A one indicates the Remote 1 Low or High temp limit has been exceeded. This bit gets

cleared on a read of the status register only if the error condition has subsided.

<5>

Read-Only

A one indicates the Local Low or High temp limit has been exceeded. This bit gets

cleared on a read of the status register only if the error condition has subsided.

<6>

R2T

Read-Only

A one indicates the Remote 2 Low or High temp limit has been exceeded. This bit gets

cleared on a read of the status register only if the error condition has subsided.

<7>

OOL

Read-Only

A one indicates that an out-of-limit event has been latched in Status Register 2. This

bit is a logical OR of all status bits in Status Register 2. Software can test this bit in

isolation to determine whether any of the voltage, temperature, or fan speed readings

represented by Status Register 2 are out-of-limit. This saves the need to read Status

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