L9963E datasheet(164/184 Pages) STMICROELECTRONICS

164 / 184 page

Table 86. Recommended components for transceiver use

Components Value Units Tolerance

Comments

CVDD5

µF

10%

Provide battery stabilization for the VCOM and VREG power inputs. 6.3V rating

RBAT_UP

kΩ

10%

Protect against STG and provide polarization for FAULT signal propagation to the

upper BMU

CVANA

2.2

µF

10%

Tank for the VANA regulator. 6.3 V rating

CESD_FLT

6.8

10%

ESD capacitor for the FAULT input. 6.3 V rating

RFLT_PD

kΩ

10%

Pull-down resistor for FAULT input

DZ_FLT

4.7

The SZMM3Z4V7T1G is recommended for clamping the voltage on the FAULT

input

RFLT

kΩ

10%

Filtering the FAULT signal and limiting the ESD inrush current

CFLT1

2.2

10%

Filtering the FAULT signal and improving ESD protection. 6.3 V rating

TRANSF

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

RTERM

120

Ω

10%

ISO line termination

6.13

Hotplug

Care must be taken while connecting the battery cells to the battery monitoring PCB. Each cell connection causes

a hotplug phenomenon that can damage L9963E if the energy flowing through the device is not properly limited.

L9963E features an integrated clamp connected to all cell-relevant pins. Such a structure is capable of

withstanding hotplug transients up to its critical point, shown in Figure 56. Hotplug energy input to a pin is entirely

deviated towards the centralized clamp and cannot propagate to other pins, since protection diodes will block the

current.

Figure 56. L9963E centralized clamp

Clamp

VBAT

Bx_x-1

Critical point:

[64 V ; 3 A]

L9963E

Hotplug

DS13636 - Rev 12

page 164/184

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