ADDRESS

Hex

Read/

Write

Bits

POR

Value

Name

Description

BF

R/W

7:3

00000

These bits are unused and should always set to 0.

2:1

00

Remote Diode

Temperature

Filter

00: Filter Disabled

01: Filter Level 1 (minimal filtering, same as 10)

10: Filter Level 1 (minimal filtering, same as 01)

11: Filter Level 2 (maximum filtering)

0

0

Comparator

Mode

0: the ALERT pin functions as an Interrupt or ARA mode.

1: the ALERT pin behaves as a comparator, asserting itself when an ALERT

condition exists, de-asserting itself when the ALERT condition goes away.

7.1.4.6 ALERT Status And Mask Registers

ADDRESS

Hex

Read/

Write

Bits

POR

Value

Name

Description

02HEX ALERT STATUS REGISTER (8-bits) (All Alarms are latched until read, then cleared if alarm condition was removed at the

time of the read.)

0x02

Read

Only

7

0

Busy

When this bit is a 0, the ADC is not converting.

When this bit is set to a 1, the ADC is performing a conversion. This bit does not

affect ALERT status.

6

0

Local

High Alarm

When this bit is a 0, the internal temperature of the LM64 is at or below the Local

High Setpoint.

When this bit is a 1, the internal temperature of the LM64 is above the Local High

Setpoint, and an ALERT is triggered.

5

0

This bit is unused and always read as 0.

4

0

Remote

High Alarm

When this bit is a 0, the temperature of the Remote Diode is at or below the

Remote High Setpoint.

When this bit is a 1, the temperature of the Remote Diode is above the Remote

High Setpoint, and an ALERT is triggered.

3

0

Remote

Low Alarm

When this bit is a 0, the temperature of the Remote Diode is at or above the

Remote Low Setpoint.

When this bit is a 1, the temperature of the Remote Diode is below the Remote

Low Setpoint, and an ALERT is triggered.

2

0

Remote Diode

Fault Alarm

When this bit is a 0, the Remote Diode appears to be correctly connected.

When this bit is a 1, the Remote Diode may be disconnected or shorted. This

Alarm does not trigger an ALERT.

1

0

Remote

T_CRIT Alarm

When this bit is a 0, the temperature of the Remote Diode is at or below the

T_CRIT Limit.

When this bit is a 1, the temperature of the Remote Diode is above the T_CRIT

Limit, and an ALERT is triggered.

0

0

Tach Alarm

When this bit is a 0, the Tachometer count is lower than or equal to the

Tachometer Limit (the RPM of the fan is greater than or equal to the minimum

desired RPM).

When this bit is a 1, the Tachometer count is higher than the Tachometer Limit

(the RPM of the fan is less than the minimum desired RPM), and an ALERT is

triggered.

16HEX ALERT MASK REGISTER (8-bits)

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LM64

SNAS207B – MAY 2004 – REVISED JANUARY 2024

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