AN4266 datasheet(46/76 Pages) STMICROELECTRONICS

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Functional safety requirements for application software

AN4266

46/76

Doc ID 024283 Rev 2

Note:

Rationale: To verify that the two sets of read data compare

It is important to note that this safety integrity function might be applied in addition to Single

Analog Read Inputs, which increases diagnostic coverage.

Figure 14.

Double Read Analog Inputs configuration

Software test implementation

●

ADC0_SWTEST_REGCRC

The ADC_0 configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

●

ADC1_SWTEST_REGCRC

The ADC_1 configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

●

SIUL_SWTEST_REGCRC

The SIUL configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

●

ADC_SWTEST_CMP

This software test is used to execute a comparison between the double acquisition

performed by one channel of ADC_0 and one channel of ADC_1. The comparison

must be approximated because of conversion differences.

ADC_0

Analog Double Read

Configuration

AN[0:8]

ADC_1

AN[0:8]

= Input Pad

AN4266 Datasheet(PDF) 46 Page - STMicroelectronics