LM87 datasheet(26/32 Pages) NSC

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Functional Description (Continued)

13.5 Configuration Register 1 — Address 40h

Power on default – <7:0> = 00001000 binary

Bit

Name

Read/Write

Description

Start

Read/Write

A one enables startup of monitoring operations, a zero puts the part in standby mode.

Note: The outputs of Interrupt pins will not be cleared if the user writes a zero to this

location after an interrupt has occurred, unlike the “INT_Clear” bit.

At start up, limit checking functions and scanning begin. Note, all limits should be set in

the Value RAM before setting this bit HIGH.

INT# Enable

Read/Write

A one enables the INT# Interrupt output.

THERM#

Enable

Read/Write

A one enables the THERM# Interrupt output.

INT#_Clear

Read/Write

A one disables the INT# output without affecting the contents of Interrupt Status

Registers. The device will stop monitoring. It will resume upon clearing of this bit.

RESET#

Read/Write

A one outputs a 20 ms minimum active low reset signal at RESET#. This bit is cleared

once the pulse has gone inactive.

Reserved

Read/Write

THERM#_Clear

Read/Write

A one disables the THERM# output without affecting the contents of Interrupt Status

Registers.

INITIALIZATION

Read/Write

A one restores power on default values to the Configuration Register, Interrupt Status

Registers, Interrupt Mask Registers, CI Clear Register, VID/Fan Divisor Register, VID4,

Temperature Configuration Register, and the Extended Mode Registers. This bit clears

itself since the power on default is zero.

13.6 Interrupt Status Register 1 — Address 41h

Power on default – <7:0> = 0000 0000 binary

Bit

Name

Read/Write

Description

+2.5Vin

Read Only