L9963T datasheet(33/45 Pages) STMICROELECTRONICS

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Components Value Unit

Max.

Tolerance

Rating

Comments

DESD

The USBLC6-2SC6Y is the recommended ESD clamp device. It also

protects the circuitry from spikes caused by a sudden short to battery

on the global ISO lines. Care must be taken while routing the component

on the PCB in order to minimize inductive spikes upon ESD strikes. Refer

to the AN2689 - Protection of automotive electronics from electrical

hazards, guidelines for design and component selection, section 5 –

PCB layout recommendations.

TRANSF

3.75 kV The ESMIT-4180/A is recommended for isolated communication interface

4.2

ISO lines circuit – Capacitive-Based insulation

The capacitive-based insulation is recommended for local communication lines between different L9963T in a

centralized BMS. It helps reducing the bill of material, while still guaranteeing common mode filtering between

stacked devices.

Figure 17. Capacitive-Based ISO lines circuit

Table 28. Capacitive-Based ISO lines BOM

Components Value Unit

Max.

Tolerance

Rating

Comments

RTERM

Ω

10%

1/16 W

Termination resistance. Differential output signal amplitude can be

calculated with the following equation:

VISODIFF=VCOM× RTERM

RDIFF_ISO_OUT

CCM_KHZ

6.8

10%

10 V

Filter common mode noise in the kHz range (inverter and other power

converters). Pole introduced is:

fcut_kℎz=

πCCM_KHZ× RISODIFF2+TTERM+7.2kΩ

Do not exceed 10 nF, otherwise common mode settling time upon ISO port

enable will last too long. Connect to AGND.

CISOP

10%

100 V

Filters the common mode, while letting the differential mode pass. It acts

as a high-pass filter with a cutoff frequency of:

fcut=

2π RDIF_ISO_OUT

2 ∥RTERMO +RTERM ×CISOP

CISOM

10%

100 V

Filters the common mode, while letting the differential mode pass. It acts

as a high-pass filter with a cutoff frequency of:

fcut=

2π RDIF_ISO_OUT

2 ∥RTERMO +RTERM ×CISOP

L9963T

ISO lines circuit – Capacitive-Based insulation

DS13590 - Rev 4

page 33/45

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