SA56004HD,118【PDF 18/43 页】IC TEMP SENSOR DIGITAL 8SOIC

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Sheet目录46

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SA56004X

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 7 25 February 2013

18 of 43

NXP Semiconductors

SA56004X

Digital temperature sensor with overtemperature alarms

Event C: The Status register bit 1 (RCRIT) is reset by a read of the Status register (in

the interrupt mode).

7.9.3 Fault Queue

To suppress erroneous ALERT

or T_CRIT

triggering, the SA56004X implements a Fault

Queue for both local and remote channel. The Fault Queue insures a temperature

measurement is genuinely beyond a HIGH, LOW or T_CRIT setpoint by not triggering

until three consecutive out-of-limit measurements have been made. The fault queue

defaults OFF upon POR and may be activated by setting bit 0 in the Configuration register

(address 09h) to logic 1.

Event A: The remote temperature has exceeded the Remote HIGH setpoint.

Event B: Three consecutive over limit measurements have been made exceeding the

Remote HIGH setpoint; the ALERT

output is activated (goes LOW). By now, the remote

temp has exceeded the Remote T_CRIT setpoint (RCS).

Event C: Three consecutive over limit measurements have been made exceeding RCS;

the T_CRIT

output is activated (goes LOW).

Event D: The remote temperature falls below the RCS - TH setpoint.

Event E: The ALERT

output is de-activated (goes HIGH) after a below_high_limit

temperature measurement is completed.

Remark: All events indicate the completion of a conversion.

Fig 8. Fault queue remote HIGH and LOW and T_CRIT, T_CRIT hysteresis setpoint

response (comparator mode)

remote temperature

RCS

RCS TH

mote HIGH setpoint

emote LOW setpoint

ALERT output

T_CRIT output

events A

D E F

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