ST STM32L4 Series, User Manual

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Table 88. DFS_SM_1
SM CODE DFS_SM_1
Description Multiple acquisition by Application software
Ownership End user
Detailed implementation
This method implements a timing information redundancy by executing multiple acquisitions
on the same input signal. Multiple acquisition data are then combined by a filter algorithm to
determine the signal correct value.
Error reporting Depends on implementation
Fault detection time Depends on implementation
Addressed fault model Transient
Dependency on Device configuration None
Initialization Depends on implementation
Periodicity Continuous
Test for the diagnostic Not applicable
Multiple-fault protection CPU_SM_0: Periodic core self-test software
Recommendations and known limitations
It is highly probable that this recommendation is satisfied by design by End userApplication
software . Usage of multiple acquisitions followed by average operations is a common
technique in industrial applications where it is needed to survive with spurious EMI disturbs on
sensor lines.
Table 89. DFS_SM_2
SM CODE DFS_SM_2
Description Range check by Application software
Ownership End user
Detailed implementation
This method is implemented as described in ADC_SM_2: Range check by Application
software .
Error reporting Depends on implementation
Fault detection time Depends on implementation
Addressed fault model Permanent/transient
Dependency on Device configuration None
Initialization Depends on implementation
Periodicity Not applicable
Test for the diagnostic Not applicable
Multiple-fault protection CPU_SM_0: Periodic core self-test software
Recommendations and known limitations The implementation of this safety mechanism is strongly application-dependent.
Table 90. DFS_SM_3
SM CODE DFS_SM_3
Description 1oo2 scheme for DFSM inputs
Ownership End user
Detailed implementation
This safety mechanism is implemented using two different DFSM modules to acquire the
same input signal.
Application software checks the coherence between the two readings.
Error reporting Depends on implementation
Fault detection time Depends on implementation
UM2305
Hardware and software diagnostics
UM2305 - Rev 10
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