LM63 datasheet(27/41 Pages) TI

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LM63

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SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013

Table 10. ALERT Status and Mask Registers

ADDRESS

READ/

POR

BITS

NAME

DESCRIPTION

HEX

WRITE

VALUE

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.)

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

Busy

When this bit is set to a 1, the ADC is performing a conversion. This bit

does not affect ALERT status.

When this bit is a 0, the internal temperature of the LM63 is at or below

Local

the Local High Setpoint.

High Alarm

When this bit is a 1, the internal temperature of the LM63 is above the

Local High Setpoint, and an ALERT is triggered.

This bit is unused and always read as 0.

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

Remote

below the Remote High Setpoint.

High Alarm

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

Remote High Setpoint, and an ALERT is triggered.

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

Remote

above the Remote Low Setpoint.

Low Alarm

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

Remote Low Setpoint, and an ALERT is triggered.

0x02

Read Only

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

Remote Diode

connected.

Fault Alarm

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

shorted. This Alarm does not trigger an ALERT.

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

Remote

below the T_CRIT Limit.

T_CRIT Alarm

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

T_CRIT Limit, and an ALERT is triggered..

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

Tach Alarm

Tachometer Limit (the RPM of the fan is less than the minimum

desired RPM), and an ALERT is triggered. Note that if this bit is set,

the function of the ALERT/Tach pin must be Tach input, so an external

ALERT condition will not be generated. The user may read the status

16HEX ALERT MASK REGISTER (8-bits)

This bit is unused and always read as 1.

Local High

When this bit is a 0, a Local High Alarm event will generate an ALERT.

Alarm Mask

When this bit is a 1, a Local High Alarm will not generate an ALERT

This bit is unused and always read as 1.

When this bit is a 0, Remote High Alarm event will generate an

Remote

ALERT.

High Alarm Mask

When this bit is a 1, a Remote High Alarm event will not generate an

ALERT.

When this bit is a 0, a Remote Low Alarm event will generate an

R/W

Remote

ALERT.

Low Alarm

When this bit is a 1, a Remote Low Alarm event will not generate an

Mask

ALERT.

This bit is unused and always read as 1.

Remote

When this bit is a 0, a Remote T_CRIT event will generate an ALERT.

T_CRIT

When this bit is a 1, a Remote T_CRIT event will not generate an

Alarm Mask

ALERT.

Tach

When this bit is a 0, a Tach Alarm event will generate an ALERT.

Alarm Mask

When this bit is a 1, a Tach Alarm event will not generate an ALERT.

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