LM87 datasheet(11/43 Pages) TI1

11 / 43 page

LM87

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SNAS034J – APRIL 2000 – REVISED MARCH 2013

When the LM87 is started, it cycles through each measurement in sequence, and it continuously loops through

the sequence approximately once every 0.4 s. Each measured value is compared to values stored in

WATCHDOG, or Hardware High Limit registers. When the measured value violates the programmed limit the

LM87 will set a corresponding Interrupt in the Interrupt Status Registers. The hardware Interrupt line INT# is fully

programmable with separate masking of each Interrupt source. In addition, the Configuration Register has a

control bit to enable or disable the hardware Interrupt. Another hardware Interrupt line available, THERM# is

used to signal temperature specific events. Having a dedicated interrupt for these conditions allows specific

actions to be taken for thermal events. This output is enabled by setting bit 2 of Configuration Register 1.

The Chassis Intrusion input is designed to accept an active high signal from an external circuit that activates and

latches when the case is removed from the computer.

INTERFACE

Figure 5. LM87 Register Structure

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LM87 Datasheet(PDF) 11 Page - Texas Instruments