Datasheet

LM87

SNAS034J –APRIL 2000–REVISED MARCH 2013

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Interrupt Status Register 1 Mirror—Address 4Ch

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

Bit Name Read Only Description

0 +2.5Vin Read Only A one indicates a High or Low limit has been exceeded.

1 Vccp1 Read Only A one indicates a High or Low limit has been exceeded.

2 Vcc Read Only A one indicates a High or Low limit has been exceeded.

3 +5Vin Read Only A one indicates a High or Low limit has been exceeded.

4 Int. Temp. Read Only A one indicates a High or Low limit has been exceeded.

5 Ext. Temp. Read Only A one indicates a High or Low limit has been exceeded.

6 FAN1/AIN1 Read Only A one indicates the fan count limit has been exceeded or an AIN1 High or Low limit has been

exceeded.

7 FAN2/AIN2 Read Only A one indicates the fan count limit has been exceeded or an AIN2 High or Low limit has been

exceeded.

nterrupt Status Register 2 Mirror—Address 4Dh

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

Bit Name Read Only Description

0 +12Vin Read Only A one indicates a High or Low limit has been exceeded.

1 Vccp2 Read Only A one indicates a High or Low limit has been exceeded.

2 Reserved Read Only

3 Reserved Read Only

4 CI Read Only A one indicates the CI (Chassis Intrusion) input has gone high.

5 THERM# Read Only A one indicates the THERM# input has been pulled low by external circuitry.

6 D1 Fault Read Only A one indicates the D1 inputs are shorted to Vcc or open circuit.

7 D2 Fault Read Only A one indicates the D2 inputs are shorted to Vcc or open circuit.

SMBALERT# Enable—Address 80h

Power on default – <7:0> = 0010 0000 binary

Bit Name Read/Write Description

0 Reserved Read Only

1 Reserved Read Only

2 Reserved Read Only

3 Reserved Read Only

4 Reserved Read Only

5 Reserved Read Only

6 SMBALERT# Read/Write A one enables the SMBALERT# mode of operation.

Enable

7 Reserved Read Only

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