3.6.13 Digital-to-analog converter (DAC)
Table 63. DAC_SM_0
SM CODE DAC_SM_0
Description Periodical read-back of configuration registers
Ownership End user
Detailed implementation
This method must be applied to DAC configuration registers.
Detailed information on the implementation of this method can be found in Section 3.6.5
Error reporting Refer to NVIC_SM_0
Fault detection time Refer to NVIC_SM_0
Addressed fault model Refer to NVIC_SM_0
Dependency on MCU configuration Refer to NVIC_SM_0
Initialization Refer to NVIC_SM_0
Periodicity Refer to NVIC_SM_0
Test for the diagnostic Refer to NVIC_SM_0
Multiple faults protection Refer to NVIC_SM_0
Recommendations and known limitations Refer to NVIC_SM_0
Table 64. DAC_SM_1
SM CODE DAC_SM_1
Description DAC output loopback on ADC channel
Ownership End user
Detailed implementation
Implementation is realized by routing the active DAC output to one ADC channel, and by checking
the output current value with his expected one
Error reporting Depends on implementation
Fault detection time Depends on implementation
Addressed fault model Permanent and Transient
Dependency on MCU configuration None
Initialization Depends on implementation
Periodicity Continuous or on demand
Test for the diagnostic Not needed
Multiple faults protection CPU_SM_0: periodical core self-test software
Recommendations and known limitations
Efficiency versus transient failures is linked to final application characteristics. We define as Tm the
minimum duration of DAC wrong signal permanence required to violate the related safety
function(s). Efficiency is maximized when execution test frequency is higher than 1/Tm
UM1845
Description of hardware and software diagnostics
UM1845 - Rev 4
page 47/108
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