L9679P datasheet(206/279 Pages) STMICROELECTRONICS

206 / 279 page

Safing logic

L9679P

206/279

DS11627 Rev 7

Figure 62. Scrap SEED-KEY state diagram

Figure 63. Scrap ACL state diagram

GAPGPS02300

Targkey=fn(SEED)

SEED=SEEDCTR

SPI_SCRAP_SEED /

SCRAPTMR=0

SPI_SCRAP_KEY=targkey /

NOT (SCRAP state OR ARMING state) /

SSM_RESET OR

SCRAPTMR=0

SPI_SCRAP_KEY=targkey /

Targkey=fn(SEED)

SEED=SEEDCTR

SPI_SCRAP_SEED /

Targkey=fn(SEED)

SEED=SEEDCTR

SPI_SCRAP_SEED /

SPI_SCRAP_KEY=targkey /

OR (wrong SPI_SCRAP_KEY) /

SCRAPTMR>TScrap_timeout

SPI_SCRAP_KEY=targkey /

Targkey=fn(SEED)

SEED=SEEDCTR

SPI_SCRAP_SEED /

Targkey=fn(SEED)

SEED=SEEDCTR

SPI_SCRAP_SEED /

valid_scrap=1

SEED

wrong SPI_SCRAP_KEY /

Targkey=fn(SEED)

SEED=SEEDCTR

SPI_SCRAP_SEED /

valid_scrap=0

SECOND SEED

valid_scrap=0

FIRST KEY

SCRAPTMR=0

SPI_SCRAP_KEY=targkey /

valid_scrap=1

KEY

valid_scrap=0

FIRST SEED

valid_scrap=0

SCRAPINIT

ACLHIGH

ACLTMR=0

SSM_RESET OR

((NOT SCRAP state) AND (NOT ARMING state)) /

ACLGOOD=0

ACLBAD=0

Falling edge &

ACLTMR > Ton_acl_lo /

ACLLOW

ACLTMR > Tacl_lo

& rising edge /

ACLGOOD++

ACLBAD=0

ACLTMR=0

ACLERROR

Rising edge OR

ACLTMR > Tacl_hi /

ACLTMR=0

ACLTMR > Ton_acl_hi OR

Falling edge & ACLTIMER

< Ton_acl_lo /

ACLGOOD=0

ACLBAD++

ACLTMR > Tacl_hi /

ACLGOOD=0

ACLBAD++

ACLTMR=0

Rising edge /

ACLTMR 0

ACLGOOD=0

ACLBAD++

GAPGPS02301

L9679P Datasheet(PDF) 206 Page - STMicroelectronics

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