User guide

Functional Description (Continued)

Item No. Description LM85CIMQ LM85BIMQ

4 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%.

5 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%.

6 Register 3Fh Device ID default 60h 62h

Revision History

Date Revision

8/2002 Added LM85BIMQ functional differences and specifications.

3/2003 Updated Register 74h, Tachometer Monitor Mode description.

LM85