AN3077 datasheet(43/82 Pages) STMICROELECTRONICS

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AN3077

Functional safety requirements for application software

●

ADC0_SWTEST_REGCRC

If ADC_0 is used, the ADC_0 configuration registers are read and CRC checksum is

computed. The checksum is compared to the expected value.

●

ADC1_SWTEST_REGCRC

If ADC_1 is used, the ADC_1 configuration registers are read and 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.

3.15.1.1.5

Implementation details

The following hardware elements shall be used for the safety function:

●

Analog input channels AN[0:8] of ADC_0

●

Analog input channels AN[11:14] of ADC_0 and ADC_1 (shared channels)

●

Analog input channels AN[0:8] of ADC_1

The user must select one channel from ADC_0 or from ADC_1. Shared channels can be

used.

Mandatory: The input pads are configured via the appropriate pad configuration registers

(PCRn) in the SIUL module.

3.15.1.2

Double Read Analog Inputs

3.15.1.2.1

Hardware elements

The Double Read Analog Input uses two analog input channels to acquire a replicated

analog input signal. Both ADC units acquire and digitize the two copies of a redundant

analog signal connected to the inputs. In this configuration (if applied to all possible analog

inputs), only half of the analog inputs are available to the applications (AN[0:8] of ADC_0 for

signals, and AN[0:8] of ADC_1 for signal copies).

Table 11. Software BIST and/or test

Software BIST and/or test

Frequency

SUPPLY SELF-TEST

Once in the FTTI

RESISTIVE-CAPACITIVE SELF-TEST

Once in the FTTI

CAPACITIVE SELF-TEST

Once in the FTTI

ADC_SWTEST_TEST1

Once in the FTTI

ADC_SWTEST_TEST2

Once in the FTTI

ADC_SWTEST_VALCHK

Once for every acquisition

ADC_SWTEST_OVERSAMPLING

Once for every acquisition

ADC0_SWTEST_REGCRC

Once in the FTTI

ADC1_SWTEST_REGCRC

Once in the FTTI

SIUL_SWTEST_REGCRC

Once in the FTTI

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