SA56004ATK NXP [NXP Semiconductors], SA56004ATK Datasheet - Page 16

• Manufacturer Part Number: SA56004ATK
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
SA56004X_5
Product data sheet
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.
Fig 8.
Event C: The Status register bit 1 (RCRIT) is reset by a read of the Status register (in
the interrupt mode).
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
Event E: The ALERT output is de-activated (goes HIGH) after a below_high_limit
temperature measurement is completed.
remote HIGH setpoint
remote LOW setpoint
Remark: All events indicate the completion of a conversion.
Fault queue remote HIGH and LOW and T_CRIT, T_CRIT hysteresis setpoint
response (comparator mode)
T_CRIT output
ALERT output
RCS
events
RCS
TH
Rev. 05 — 22 May 2008
A
Digital temperature sensor with overtemperature alarms
B
C
remote temperature
D
E
F
TH setpoint.
G
SA56004X
H
© NXP B.V. 2008. All rights reserved.
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