L9963E datasheet(142/184 Pages) STMICROELECTRONICS

142 / 184 page

Table 79. FAULT line BOM

Components Value

Unit

Max.

tolerance

Rating

Comments

RBAT_OUT

kΩ

10%

1/2 W

Protect against STG and provide polarization for FAULT signal

propagation to the upper BMU

Do not use thin film resistors on these lines connected to ECU global

pins. They could drift upon System Level ESD strikes. Use thick film or

metal foil instead.

RPD

kΩ

10%

1/10 W Pull-down resistor for FAULT input

4.7

The SZMM3Z4V7T1G is recommended for clamping the voltage on the

FAULT input

RFAULT_HIGH

6.2

kΩ

10%

1/2 W

Filtering the FAULT signal and limiting the ESD inrush current. Protect

the FAULTH input in case of external short to battery.

Do not use thin film resistors on these lines connected to ECU global

pins. They could drift upon System Level ESD strikes. Use thick film or

metal foil instead.

CFAULT

2.2

10%

50 V

Filtering the FAULT signal and improving ESD protection and immunity

to ISO spikes

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

RBAT_IN

6.2

kΩ

10%

1/2 W

Protect against external shorts and provide polarization for FAULT

signal propagation to the lower BMU

Do not use thin film resistors on these lines connected to ECU global

pins. They could drift upon System Level ESD strikes. Use thick film or

metal foil instead.

RFAULT_OUT

6.2

kΩ

10%

1/2 W

Protect against external shorts and provide polarization for FAULT

signal propagation to the lower BMU

Do not use thin film resistors on these lines connected to ECU global

pins. They could drift upon System Level ESD strikes. Use thick film or

metal foil instead.

DOPT

Protect against sudden external shorts or ESD strikes. The

SMA6T82AY is recommended.

L9963E

FAULT line circuit

DS13636 - Rev 12

page 142/184

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