L9963E datasheet(143/184 Pages) STMICROELECTRONICS

143 / 184 page

6.7.2

Centralized BMS

In a centralized BMS, the FAULT Line can be easily implemented via a wired-OR approach. This allows a

consistent simplification of the BOM.

The optocouplers can be all fed by the same supply as the MCU. Then, only a pull-down resistor and an RC filter

are needed to interface the fault output bus to the GPIO used to read back the fault status.

FAULTH input is not used and must be connected to DGND.

The recommended circuit is shown in Figure 40.

Table 80. Fault line BOM for a centralized BMS

Components Value

Unit

Max.

tolerance

Rating

Comments

RPD

kΩ

10%

1/16 W Pull-down resistor for FAULT input

RFIL_FAULT

kΩ

10%

1/16 W

Filtering the FAULT signal. Place this as close as possible to the

MCU GPIO sensing the fault line.

CFIL_FAULT

100

10%

16 V

Filtering the FAULT signal. Place this as close as possible to the

MCU GPIO sensing the fault line.

RBASE

kΩ

10%

1/16 W Limit base current to the optoisolator

OPT

3.75

kVrms

The PS2703-1-F3-K-A is recommended for isolated propagation of

the FAULT signal

L9963E

FAULT line circuit

DS13636 - Rev 12

page 143/184

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