L9965P datasheet(11/104 Pages) STMICROELECTRONICS

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Table 6. Device FSM

State

Purpose

Reached

from

Condition

Active resources

OFF

Device OFF

Any state

When the ERBST voltage falls below the

VPOR_TH threshold

None

DEEP-

SLEEP

Ultralow power

state for managing

long inactivity

periods or

implementing low-

power strategies

NORMAL

When CWUP is low, fault timeout

(tFAULT_HANDLING_TIMEOUT) is expired,

the SPI communication timeout

(tSPI_COMM_TIMEOUT) is expired and

ERBST is not working (ER CAP

charged)

SPI SLEEP frames

Wake-up from cyclic wake-up pin

(CWUP)

Wake-up via peripheral SPI

Wake-up from fire enable inputs

(FENH/FENL)

OFF

When ERBST voltage rises above the

VPOR_TH threshold

Wake-up from cyclic wake-up pin

(CWUP)

Wake-up via peripheral SPI

DIAG

Diagnostic state

DEEP-

SLEEP

When CWUP is asserted

All resources are active in

NORMALAdditionally, all the

resources needed to perform the

diagnostic routine

NORMAL

When commanded via SPI

NORMAL

Normal operating

state

DEEP-

SLEEP

Wake-up from any of the enabled

sources (FENH or FENL or SPI valid

pattern)

All resources are active, except the

ones needed to perform the

diagnostic routine

ARM

All the enabled deploy conditions (FENH

and FENL) are deasserted

Arming timeout (corresponding to

deployment time) expired

FIRE_GOOD

DIAG

Diagnostic routine over

ARM

Prepare to deploy

NORMAL

or DIAG

At least one deploy condition asserted

between FENH, FENL or SPI ARM

frame

All resources active in NORMAL,

except the ones needed to perform

the diagnostic routine

L9965P

Functional description

DS14702 - Rev 4

page 11/104

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