L9908 datasheet(31/153 Pages) STMICROELECTRONICS

31 / 153 page

Figure 13. Self-test mode state machine (NORMAL MODE)

Note:

Self-Test procedure shall be activated only when the L9908 is supplied within its Functional Operating Range

otherwise the self-check may fail.

Two SPI readable flags are present in the register GEN_STATUS1 to read-back the BIST state machine activation

status according to the following table:

Table 22. Self-test procedure status bits

SELF_TEST_STATUS1

SELF_TEST _STATUS0

Description

SELF TEST stop

SELF TEST running

SELF TEST finished with NO Failure

SELF TEST finished with Failure

The self-test mode is left when procedure ends or after the Self-Test Time-out expiration: after accessing self-test

mode a timeout is started, when the timeout expires, it is aborted.

Note:

All parameters are guaranteed and tested in the voltage ranges reported in Table 5 unless otherwise specified.

Where not specified the parametrical operating range equals the functional operating range.

Table 23. Self-test timings and timeout

Symbol

Parameter

Min

Typ

Max

Unit

Notes

T_hwsc

Self-Test procedure duration

0.65

0.75

Not subject to production test

T_selftest_time_out

SELF TEST Mode Time-out

0.77

0.88

0.99

Not subject to production test

5.6

Fault Handling Management (FHM)

The fault set is divided into two main categories based on the required corrective actions:

L9908

Fault Handling Management (FHM)

DS13546 - Rev 3

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