L9679P datasheet(48/279 Pages) STMICROELECTRONICS

Part #	L9679P

Description	Automotive advanced airbag for mid/high end applications and cut-off battery IC

PDF	279 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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48 / 279 page

Start-up and power control

L9679P

48/279

DS11627 Rev 7

An open VCC pin shall lead to an under voltage condition on VCC supply monitor. The SPI

related signals (SCLK, MISO, MOSI, CS) or other digital nets shall not power the VCC pin

due to back-feeding paths.

Figure 23. VCC regulator state diagram

VCC_ON

VCC pullup disabled

All Output Buffer enabled

VCC BUCK

power mode control

VCC_UVL = 1 when VCC < VCCuvl

VCC_UV = 1 when VCC < VCCuv

VCC_OV = 1 when VCC > VCCov

DIS_VCOREMON = VCCSEL > Vth1_vccsel

SATBUCK_OK = 1 when SATBUCK > Vsatbck_ok

VCCGND_loss =1

VCORE_OV =1

VCC_OV = 1

[(VCC_UV=1 OR VCC_UVL=1) AND T1 timeout)]

SLEEP_MODE

POWER-OFF_MODE

T1 timeout

AND

VCC_UVL = 0

AND

VCC_UV = 0

VCCGND_loss = 0

AND

SATBUCK_OK = 1

All Ouput Buffer disabled

VCC pull-up disabled

VCC_OFF

VCC pull-up enabled

Start T1 4ms

VCC_rampup

VCCGND_loss =1

VCC_OV =1

VCC_UVL =1

(VCORE_UV =1 AND DIS_VCOREMON =0)

VCORE_OV =1

T2 timeout

(Buck is not running)

VCC pull-up disabled

Start T2 5ms

VCC_SHUTDOWN

GAPGPS02270

L9679P Datasheet(PDF) 48 Page - STMicroelectronics

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