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L9965P 데이터시트(PDF) 85 Page - STMicroelectronics

부품명 L9965P
상세설명  Automotive single channel pyro-fuse driver
PDF  104 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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L9965P 데이터시트(HTML) 85 Page - STMicroelectronics

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4
Application scenarios
4.1
Typical application circuit
The application scenarios shown in the following are only for reference. Please refer to the dedicated Application
Notes for more information.
4.1.1
12 V battery with MCU and ERBST mounted
The Figure 29 shows a typical application diagram for a pyro-fuse system using the ERBST regulator and
interfaced with a generic MCU.
Figure 29. Application circuit: 12 V battery with MCU and ERBST mounted
Arming logic
Deployment
driver
3V3 int
regulator
ER boost regulator
ER discharge
switch
Global configuration and
control, ADC, bias and
diagnostics
5V or 3.3V
PS
FAULTN
CWUP
NCS
SCLK
SDI/MOSI
SDO/MISO
Power management, diagnostics and monitoring
CIN
LERBST
DERBST
CER1
RDCH
VBAT
PF
PR
PYRO
FUSE
VIO
PGND
TVS
CER2
RFAULTN
CVIO
CPF
CPR
MCU
CFAULTN
MCU
PMIC
The CER electrolytic capacitors are connected to ERBST regulator that charges them to a higher voltage respect
to battery level VBAT.
ERDCHSW pin is used to allow CER controlled discharge for safety and diagnostic purposes. RDCHG sets the limit
current for the discharge phase.
Note:
See the dedicated Application Note.
L9965P
Application scenarios
DS14702 - Rev 4
page 85/104



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