ST UM3144 Evaluation Board For L9678 Airbag And Battery Cut-Off IC User Manual
- June 9, 2024
- ST
Table of Contents
ST UM3144 Evaluation Board For L9678 Airbag And Battery Cut-Off IC
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
Hardware 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
L9678-S-EVB evaluation board
Board layout
Assembly Top
Assembly Bottom
Jumpers 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
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
#| 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| –| –
Default condition.
Test 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 |
| Designator | Name | Function |
| --- | --- | --- |
| TP39 | GND | GND monitoringC |
Revision history
Document revision history
| Date | Version | Changes |
|---|---|---|
| 02-Mar-2023 | 1 | Initial release. |
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