LM85 datasheet(25/26 Pages) NSC

Part #	LM85

Description	Hardware Monitor with Integrated Fan Control

PDF	26 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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25 / 26 page

Functional Description (Continued)

Item No.

Description

LM85CIMQ

LM85BIMQ

Overide bit (register 40h bit 3)

function with disabled PWM output

(Fan configuration registers

5Ch-5Eh, bits

fan_config[7:5]=ZON[2:0]=100

The override bit has no effect when

the PWM output is disabled.

The overide bit has precedance

over all of the PWM output dissable

bits. Therefore, if a PWM output is

dissabled, setting the override bit

will set the PWM output to 100%.

Auto Fan mode and Absolute

Temperature Limit function

Only the PWM output associated

with the zone that has exceeded its

Absolute Limit will increase to

100%.

When one zone exceeds its

Absolute Limit all PWM outputs wil

increase to 100%.

60h

62h

Revision History

Date

Revision

8/2002

Added LM85BIMQ functional differences and specifications.

3/2003

Updated Register 74h, Tachometer Monitor Mode description.

LM85 Datasheet(PDF) 25 Page - National Semiconductor (TI)