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L9679P データシート(PDF) 33 Page - STMicroelectronics

部品番号 L9679P
部品情報  Automotive advanced airbag for mid/high end applications and cut-off battery IC
PDF  279 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P データシート(HTML) 33 Page - STMicroelectronics

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DS11627 Rev 7
33/279
L9679P
Start-up and power control
278
6.2.5
Power-up and power-down sequences
The behaviour of the IC during normal power-up and power-down is shown from Figure 6 to
Figure 9. The following sequences represent just a subset of all possible power-up and
power-down scenarios. In Figure 6 a normal IC power-up controlled by the state of the
WAKEUP pin is shown.
Figure 6. Normal power-up sequence
VBBAD
VBGOOD
VBAT _MON
WAKE UP
4ms
<1ms
WU_on
VINT
POR
ERBSTSW
and
SYNCBSTSW
ERBOOST
VER
VCC
RESET
<50 A
VIN current
WU_mon
>1ms
VIN-Vdiode
0V
SYNCBOOST_OK
VIN-Vdiode
SYNCBOOST
SAT BCKSW
SATBUCK_OK
SATBUCK
VCCBCKSW
VCC_UV
<50 A
WU_off
VINT_UV
0V
0V
0V
0V
0V
SPI_SYS_CTL(ER_CUR_EN)=01
VIN
VINBAD
VINGOOD
SPI
command
RESET output buffer disabled – only passive pull down
keep low the RESET pin
RESET
output buffer active
Reset_hold_time
VCCSEL
VTH1_H_VCCSEL
VCORE
0V
0V
GADG1406180758PS



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