ST L9678-S-EVB Manual de usuario

Introduction

The L9678-S-EVB evaluation board is an evaluation board designed to provide to the user a platform for the evaluation of the

L9678P or L9678P-S devices. The board provides all the main input/output capabilities needed to properly drive all IC inputs

and outputs and to provide diagnostic functionalities.

Evaluation board for L9678 airbag and battery cut-off IC

UM3144

User manual

UM3144 - Rev 1 - March 2023

For further information contact your local STMicroelectronics sales office.

www.st.com

1Hardware description

The L9678-S-EVB evaluation board has been developed to evaluate the L9678P or L9678P-S devices and test all

their functionalities.

Its main features are:

• L9678P/L9678P-S placed into a socket allowing an easy change of the samples

• Possibility to solder L9678P/L9678P-S directly on the PCB

• Total accessibility to all pins through test points

• Presence of jumpers to fix the desired set up configuration

• Possibility to interface the board with SPC56P-Discovery board

Figure 1. L9678-S-EVB evaluation board

UM3144

Hardware description

UM3144 - Rev 1 page 2/12

2Board layout

Figure 2. Assembly Top

Figure 3. Assembly Bottom

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Board layout

UM3144 - Rev 1 page 3/12

3Jumpers and connectors description

On Table 1 the name of each jumper on the board is listed while their default setting (closed or open) is reported

in green; the name of the connectors and test points present on the board is also remarked.

Table 1. Jumpers and connectors description

# Name J = Jumper

C = Connector Function Closed Open

J1 PGND J Connection of PGND to GND Power ground connected to

common ground(1) -

J2 WDT J To disable the watchdog timer Watchdog disabled Watchdog enabled(1)

J3 J To set VCC to 5 V or to 3.3 V

1-2 closed: VCC connected to

VDD3V3

2-3 closed: VCC connected to

VDD5(1)

J4 VBAT C Battery voltage - -

J5 IGN J To wake-up the device Device waked-up(1) Device not waked-up

J6 J

Connection of L9678 RESET

pin to GPIO or RESET pin of

μC

1-2 closed: RESET_L96xx

connected to uC RESET pin

2-3 closed: RESET_L96xx

connected to μC GPIO0 pin

J7 SAFING INPUT J

Connection of safing FET

gate to VSF directly or

through MUN5332DW

1-2 closed: safing FET

enabled via uC

2-3 closed: safing FET always

enabled

Safing FET disabled

J8 J To discharge the ER capacitor ER capacitor shorted to

ground

ER capacitor

charged(1)

J9 J To connect the ER cap

negative to ground

Cap negative connected to

ground(1)

Cap negative not

connected to ground

J10 HEADER34X4 C To connect the L9678 demo

board to discovery board - -

J11 J To connect ISOK bus 2-3 closed: ISO bus

enabled(1) -

J12 J Not used for L9678 -

J13 BGND J Connection of BGND to GND Boost ground connected to

common ground(1) -

J15 J Reserve voltage diagnostic

(VRES)

VRES can be connected to

ERBOOST, VBAT or VSUP

Reserve voltage is

not diagnosed

J16 J Not used for L9678

J17 J Connection of VCC to

VCC_Micro

VCC connected to

VCC_Micro

VCC and VCC_Micro

disconnected(1)

J18 C SPI interface connector - -

J19 C SPI interface connector - -

J20 AGND J Connection of AGND to GND Analog ground connected to

common ground(1) -

J28 J RSU power supply

1-2 closed: RSU power

supply connected to VSUP(1)

2-3 closed: not used for

L9678

No RSU power

supply

UM3144

Jumpers and connectors description

UM3144 - Rev 1 page 4/12

# Name J = Jumper

C = Connector Function Closed Open

J29 J To connect the ER cap

positive to VER

Cap positive connected to

VER(1)

Cap positive not

connected to VER

J30 C Airbag standard connector - -

1. Default condition.

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Jumpers and connectors description

UM3144 - Rev 1 page 5/12

4Test point list

Designator Name Function

TP1 FENH FENH monitoring

TP2 FENL FENL monitoring

TP3 COVRACT COVRACT monitoring

TP4 ACL ACL monitoring

TP5 ARM1 ARM/ARM1 monitoring

TP6 WDT WDT monitoring

TP7 ERBOOST ERBOOST monitoring

TP8 uc_SAFING Monitoring of μC safing FET enable

TP9 VIN monitoring

TP10 VDD3P3 VDD3P3 monitoring

TP11 BVSUP BVSUP monitoring

TP12 SAFING OUTPUT SAFING OUTPUT monitoring

TP13 VSUP VSUP monitoring

TP14 SS01 SS01 monitoring

TP15 SS23 SS23 monitoring

TP16 SS45 SS45 monitoring

TP17 SS67 SS67 monitoring

TP18 SS89 SS89 monitoring

TP19 SSAB SSAB monitoring

TP20 CVDD monitoring

TP21 VBATMON monitoring

TP22 BVVD5 BVVD5

TP23 VDD5 VDD5 monitoring

TP24 SYNCBOOST monitoring (only L9679/80)

TP25 Monitoring of Q5 collector voltage

TP26 Monitoring of μC diagnostic enable

TP27 SATBCK monitoring

TP28 VCC monitoring

TP29 RSU4 monitoring

TP30 RSU3 monitoring

TP31 RSU1 monitoring

TP32 RSU0 monitoring

TP33 GND GND monitoring

TP34 CS_RS CS_RS monitoring (only L9680)

TP35 SPI_CS SPI CS monitoring (only L9679/80)

TP36 GND GND monitoring

TP37 GND GND monitoring

TP38 GND GND monitoring

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Test point list

UM3144 - Rev 1 page 6/12

Designator Name Function

TP39 GND GND monitoring

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Test point list

UM3144 - Rev 1 page 7/12

Revision history

Table 2. Document revision history

Date Version Changes

02-Mar-2023 1 Initial release.

UM3144

UM3144 - Rev 1 page 8/12

Contents

1Hardware description ..............................................................2

2Board layout.......................................................................3

3Jumpers and connectors description ..............................................4

4Test point list ......................................................................6

Revision history ........................................................................8

UM3144

Contents

UM3144 - Rev 1 page 9/12

List of tables

Table 1. Jumpers and connectors description ......................................................4

Table 2. Document revision history ..............................................................8

UM3144

List of tables

UM3144 - Rev 1 page 10/12

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