SPSB100 datasheet(30/214 Pages) STMICROELECTRONICS

30 / 214 page

3.6.2.6

FBB voltage drop management

SPSB100 monitors the voltage on FBB pin. The state machine reacts in case of FBB pin voltage drops below

VFBB_UV_F threshold by executing a power-down sequence and transitioning to RECOVERY-2 then INIT state. In

INIT state SPSB100 restarts when the FBB pin voltage rises above VFBB_OK_R.

Figure 19. FBB pin voltage fault reaction

ACTIVE

state

WD trigger OK*

LOW-POWER

mode

FULL-POWER

mode

SPI cmd

WD trigger OK*

Execute

Power-Up

sequence

Finished OK

INIT

state

REC-1

state

Execute

Power-Down

sequence

REC-2

state

VFBB ≤ VFBB_UV_F

VFBB_OK_R < VFBB < VFBB_OV

* when LOW_SET = 1111, watchdog service is disabled

(WD LOW trigger OK*) & (all

flag cleared)

In case VS pin voltage drops below VPORVS_F a hard reset of SPSB100 is generated independently of SPSB100

current state, the POWER-OFF state is forced. SPSB100 starts up again after VS pin voltage rises above

VPORVS_R.

Figure 20. VS pin voltage fault reaction

Power

OFF

START -UP

state

any

STATE

SPSB100

unpowered

> V

PORVS_R

VVS < VPORVS_F

SPSB100

Functional description

DS14640 - Rev 1

page 30/214

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