L9965P datasheet(85/104 Pages) STMICROELECTRONICS

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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

FAULTN

CWUP

NCS

SCLK

SDI/MOSI

SDO/MISO

Power management, diagnostics and monitoring

CIN

LERBST

DERBST

CER1

RDCH

VBAT

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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