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AN4475 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN4475
Description  Safety Application Guide for SPC563Mxx family
Download  26 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4475 Datasheet(HTML) 5 Page - STMicroelectronics

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General information
AN4475
6/27
DocID026216 Rev 1
1
General information
1.1
Mission profile
The assumed mission profile is:
Lifetime: 20 years
Total operating hours: 12000 hours
Trip time(a): 10 hours
Fault Tolerant Time Interval(b): 10 ms
1.2
Safe state
The Safe states of the SPC563MXX are as follows:
Completely unpowered
Reset
Operating correctly
Explicitly indicating an internal error
If the SPC563Mxx signals an internal failure via its error out signals, the surrounding
subsystem is longer use the SPC563Mxx outputs for safety functions since these signals
are no longer considered reliable. If an error is indicated, the system must be able to remain
in a Safe state without any additional MCU actions. Depending on its configuration, the
system may disable, or reset, the SPC563Mxx as a reaction to the error signal.
Suggested: the system must set the system itself to a safe state when an error is indicated.
1.3
Failure indication time
The SPC563Mxx failure indication time has taken into consideration when determining
application safety strategies, because it must be less than the FTTI.
1.4
Error handling
Error handling can be split into two categories:
Handling of errors during run-time
Handling of errors during boot-time
Suggested: run-time failures are handled in a time shorter than the FTTI.
Suggested: boot-time failures are handled before the safety function starts.
a.
Trip time is defined as the maximum MCU operation time without Power-On Reset.
b.
Quoting the ISO262562, the Fault Tolerant Time Interval (FTTI) is the time-span in which a fault or faults can
be present in a system before a hazardous event occurs.


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