User Manual

Functional Description (Continued)

Interrupt source. In addition, the Configuration Register has

a control bit to enable or disable the hardware Interrupt.

Another hardware Interrupt line available T_CRIT_A (Critical

Temperature Alarm Output) is used to signal a catastrophic

overtemperature event. Having a dedicated interrupt for this

purpose allows for the fastest possible response time to a

thermal runaway event. This output can be enabled by set-

ting bit 4 of Extended Mode Register 1.

The Chassis Intrusion input is designed to accept an active

high signal from an external circuit that latches when the

case is removed from the computer.

2.0 INTERFACE

DS100072-7

FIGURE 4. LM81 Register Structure

LM81