SA56004X
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?NXP B.V. 2013. All rights reserved.
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
B
C
D E F
G
H
I
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