L9965P-FN datasheet(10/104 Pages) STMICROELECTRONICS

10 / 104 page

Functional description

In the following paragraphs all the bits in bold are located in the NVM and are protected by lock to avoid

unwanted modification (see the Section 3.15: Configuration Lock).

3.1

Device functional states (FSM)

The L9965P operates according to the FSM shown in the Figure 3.

Figure 3. Device FSM

DEEP

SLEEP

NORMAL

DIAG

DIAG_START = 1

FENH active level

OR FENL active level

OR SPI valid pattern

OFF

ERBST > V POR_STBY + VPOR_HYS

ERBST < V POR_STBY

ARM

CWUP = 1

ERBST < V POR_STBY

(CWUP = 0 AND Fault timeout not running AND

CommTimeout not running AND ERBST not switching)

OR SPI SLEEP frame

Diag Routine Over

FENH asserted

OR FENL asserted

OR SPI ARM frame

(FENH deasserted AND

FENL deasserted AND

deploy not started)

OR ARM Timeout expired

OR FIRE_GOOD

FENH asserted

OR FENL asserted

OR SPI ARM frame

The Table 6 summarizes the FSM behavior, describing the transitions and the resources active in each operating

state.

L9965P

Functional description

DS14702 - Rev 4

page 10/104

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