SPSB100 datasheet(28/213 Pages) STMICROELECTRONICS

28 / 213 page

Figure 17. Regulator faults reaction with REGFAIL_GO_REC = 1

ACTIVE

state

WD trigger OK*

LOW-POWER

mode

FULL-POWER

mode

SPI cmd

WD trigger OK*

Execute

Power-Up

sequence

Finished OK

Execute

Power-Down

sequence

(retry ≤ 3)

OR (for_ever = 1) ?

Retry loop

NFSO asserted

TSD event & T ° cooled down & cnt < 3

OR REG fail & GoREC=1 (except TSD)

DEEP-SLEEP

state

INIT

state

Wake-up

event

REC-1

state

REG fail & GoREC=1

Execute

Power-Down

sequence

REC-2

state

REG fail & GoREC=1

PG_TimeOut reached

OR REGfail & GoREC=1

TSD event & cnt ≥ 3

TSD event & not T ° cooled down

VFBB_OK_R < VFBB < VFBB_OV

* when LOW_SET = 1111, watchdog service is disabled

(WD LOW trigger OK*) & (all flag cleared)

When REGFAIL_GO_REC is reset to ‘0’, a fault detected on regulator, TSD, UV, OC, INT_FAIL, FBLOSS and OV

monitors will:

•

Set the associated flag.

•

Send an interruption. The interruption can be masked for UV, OC, INT_FAIL, FBLOSS and OV and TW, not

for TSD.

•

Switch OFF the regulator if the action is not masked. Action of UV and OC is maskable, while an INT_FAIL,

FBLOSS, OV and TSD event always switch OFF the regulator. TW event never switches OFF the

regulator.

The state machine does not change its state if REGFAIL_GO_REC is reset to ‘0’.

SPSB100

Functional description

DS14640 - Rev 2

page 28/213

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