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L9678P Datasheet(PDF) 26 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 26 Page - STMicroelectronics

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Start-up power control
L9678P, L9678P-S
26/216
DS11626 Rev 9
Figure 6. Normal power-up sequence - VIN controlled
Two different scenarios for power-down of the IC are shown here below. Figure 7 describes
the powering down for the case when WAKEUP pin is released. As soon as a SPI_SLEEP
command is received by the MCU the System will immediately move to the energy reserve
(PASSIVE mode). In Figure 8, VIN release begins the shutdown process.
VIN current
VBAT
(VIN)
WAKEUP
VINT, CVDD
POR
ERBOOST
WU_mon
WU_on
VDD5
VDD3V3
VDD3V3_U
V
RESET
RESET
Hold Time
SPI ER
charge on
VER
VINGOOD
GAPGPS02864



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