Table 75. Adc_Sm_3; Table 76. Adc_Sm_4 - ST STM32L4 Series User Manual

SM CODE
Addressed fault model
Dependency on Device configuration
Initialization
Periodicity
Test for the diagnostic
Multiple-fault protection
Recommendations and known limitations
SM CODE
Description
Ownership
Detailed implementation
Error reporting
Fault detection time
Addressed fault model
Dependency on Device configuration
Initialization
Periodicity
Test for the diagnostic
Multiple-fault protection
Recommendations and known limitations
SM CODE
Description
Ownership
Detailed implementation
Error reporting
Fault detection time
Addressed fault model
Dependency on Device configuration
Initialization
Periodicity
UM2305 - Rev 10
Depends on implementation
None
Depends on implementation
Continuous
Not applicable
CPU_SM_0: Periodic core self-test software
The implementation and the related diagnostic efficiency of this safety mechanism are strongly
application-dependent.
Table 75. ADC_SM_3
Periodic software test for ADC
End user
The method is implemented acquiring multiple signals and comparing the read value with
the expected one, supposed to be know. Method can be implemented with different level of
complexity:
• Basic complexity: acquisition and check of upper or lower rails (VDD or VSS) and
internal reference voltage
• High complexity: in addition to basic complexity tests, acquisition of a DAC output
connected to ADC input and checking all voltage excursion and linearity
Depends on implementation
Depends on implementation
Permanent
None
Depends on implementation
Periodic
Not applicable
CPU_SM_0: Periodic core self-test software
Combination of two methods with different complexity can be used to better optimize test
frequency in high-demand safety functions.
Table 76. ADC_SM_4
1oo2 scheme for ADC inputs
End user
This safety mechanism is implemented using two different SAR ADC channels belonging to
separate ADC modules to acquire the same input signal. Application software checks the
coherence between the two readings.
Depends on implementation
Depends on implementation
Permanent/transient
None
Depends on implementation
On demand
Hardware and software diagnostics
ADC_SM_2
ADC_SM_3
ADC_SM_4
UM2305
page 47/110