L9680 datasheet(73/277 Pages) STMICROELECTRONICS

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L9680

SPI interfaces

276

7.3.3

System control register (SYS_CTL)

ID:

Type:

Read:

0200

Write:

0004

MOSI

MISO

0000

RESTART_SYBST_SEL

Selection of comparator used to restart sync boost in erstate (don't care in

case SYS_CTL(KEEP_SYNCBST_ON) bit is high)

0 VIN comparator is used; syncboost is switched off entering erstate and

switched on once VIN goes above VIN_fastslope threshold.

1 SYNCBST comparator is used; syncboost is switched off entering

erstate and switched on when SYNCBST voltage falls down

VSYNCBST_RESTART_TH threshold (this condition requires that

SYNCBST voltage has been pulled up above the same threshold

previously).

PD&VRCM_SEL

0 Squib pull down current level and VRCM leakage to GND threshold selection

0 1 mA pull down current and 450 μA VRCM leakage to GND threshold

1 5 mA pull down current and 2 mA VRCM leakage to GND threshold

KEEP_SYNCBST_ON

SYNC Boost behaviour during ER state

0 SYNC Boost is disabled entering in ER state

1 SYNC Boost stay enabled in ER state. If boost is OFF in ER state and

this command is received during that state the boost is switched on.

VIN_TH_SEL

0 VIN comparators threshold selector

0 VINGOOD= VINgood0

1 VINGOOD= VINgood1

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