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L9679P Datasheet(PDF) 48 Page - STMicroelectronics

No. de pieza L9679P
Descripción Electrónicos  Automotive advanced airbag for mid/high end applications and cut-off battery IC
PDF  279 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P Datasheet(HTML) 48 Page - STMicroelectronics

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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
OR
VCORE_OV =1
OR
VCC_OV = 1
OR
[(VCC_UV=1 OR VCC_UVL=1) AND T1 timeout)]
SLEEP_MODE
OR
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
OR
VCC_OV =1
OR
VCC_UVL =1
(VCORE_UV =1 AND DIS_VCOREMON =0)
OR
VCORE_OV =1
T2 timeout
(Buck is not running)
VCC pull-up disabled
Start T2 5ms
VCC_SHUTDOWN
GAPGPS02270



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