MAX6581TG9A+【PDF 17/27 页】IC TEMP SENSOR 8-CH PREC 24-TQFN

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Sheet目录43

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Maxim Integrated

?癈 Accurate 8-Channel Temperature Sensor

MAX6581

Status Register Functions

There are four status registers (see Tables 710). The

ALERT High Status register indicates whether a mea-

sured local or remote temperature has exceeded the

associated threshold limit set in an ALERT High Limit

a measured temperature has exceeded the associated

threshold limit set in an OVERT High Limit register. The

Diode Fault Status register indicates whether there is a

diode fault (open or short) in any of the remote-sensing

channels. The ALERT Low Status register indicates

whether the measured temperature has fallen below the

threshold limit set in the ALERT Low Limits register for

the local or remote-sensing diodes.

Bits in the alert status registers are cleared by a success-

ful read, but set again after the next conversion unless

the fault is corrected, either by a drop in the measured

temperature or a change in the threshold temperature.

The ALERT interrupt output follows the status flag bit.

Once the ALERT output is asserted, it can be deasserted

by either reading the ALERT High Status register or by

successfully responding to an alert response address. In

both cases, the alert is cleared even if the fault condition

exists, but the ALERT output reasserts at the end of the

next conversion.

The bits indicating OVERT faults clear only when the

measured temperature drops below the temperature

threshold minus the hysteresis value (4NC), or when the

trip temperature is set to a value at least 4NC above the

current temperature.

Table 7. ALERT High Status Register (44h)

BIT

NAME

POR

STATE

FUNCTION

7 (MSB)

Remote ALERT

High 7

Channel 7 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the channel 7

remote-diode temperature exceeds the programmed temperature threshold limit in the

Remote 7 ALERT High Limit register.

Local ALERT

High

Local Channel High-Alert Bit. This bit is set to logic 1 when the local temperature

exceeds the temperature threshold limit in the Local ALERT High Limit register.

Remote ALERT

High 6

Channel 6 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the channel 6

remote-diode temperature exceeds the programmed temperature threshold limit in the

Remote 6 ALERT High Limit register.

Remote ALERT

High 5

Channel 5 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the channel 5

remote-diode temperature exceeds the programmed temperature threshold limit in the

Remote 5 ALERT High Limit register.

Remote ALERT

High 4

Channel 4 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the channel 4

remote-diode temperature exceeds the programmed temperature threshold limit in the

Remote 4 ALERT High Limit register.

Remote ALERT

High 3

Channel 3 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the channel 3

remote-diode temperature exceeds the programmed temperature threshold limit in the

Remote 3 ALERT High Limit register.

Remote ALERT

High 2

Channel 2 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the channel 2

remote-diode temperature exceeds the programmed temperature threshold limit in the

Remote 2 ALERT High Limit register.

Remote ALERT

High 1

Channel 1 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the channel 1

remote-diode temperature exceeds the programmed temperature threshold limit in the

Remote 1 ALERT High Limit register.

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