AN3324 datasheet(22/37 Pages) STMICROELECTRONICS

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AN3324

Module software requirements for non applicative peripherals

Doc ID 18311 Rev 2

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3.13

Power Management Unit (PMU)

Software has to run core voltage LVD and HVD hardware-assisted self-test after the boot.

The PMU provides (to the user) the software capability to check the run of the BIST

procedure, generating non-critical faults (NCFs) or critical faults (CF) conditions for the

FCCU module (see Table 2: Fault assertion conditions).

At each power-on, the self-test circuitry is able to detect a failure of one of the two voltage

detectors and to provide a non critical fault (NCF) to the FCCU (see Section 3.5: Fault

Collection and Control Unit (FCCU)).

Note:

The hardware-assisted self-tests are initiated through the SIL fields in the PMU Control

Figure 8: PMU power-on self test flow). If the self-test fails, a PMUCTRL_IRQS and Critical

Fault are asserted.

The BIST execution is controlled by the PMUCTRL_CTRL[SILHT] field (see Figure 7: Built-

in self test flow).

Figure 7.

Built-in self test flow

Table 2.

Fault assertion conditions

Fault number

Signal

NCF[13]

LVD BIST ok in test mode

NCF[14]

HVD BIST ok in test mode

CF[21]

LVD/HVD BIST failure result in test mode

LVD

(SILHT = 00)

Write SILHT = 01

IDLE MODE

TEST MODE

(SILHT = 01)

HVD

TEST MODE

(SILHT = 10)

Write SILHT = 10

Automatically at the

end of test

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