L9963E datasheet(135/184 Pages) STMICROELECTRONICS

135 / 184 page

6.3

Cell voltage sensing circuit

Figure 33 shows the recommended cell voltage sensing circuit.

Figure 33. Typical cell voltage sensing circuit

Table 74. Typical BOM for cell voltage sensing circuit

Components Value

Unit

Max.

tolerance

Rating

Comments

RLPF

100

Ω

10%

1/16 W

LPF resistor for cell voltage measurement. Do not exceed

3 kΩ, otherwise cell open failure could be detected. Higher

values of resistance cause higher measurement offset error

due to the leakage ICELL_LEAK from Cx pins (see Table 39).

A typical value of 100 Ω is recommended for pre-filtering the

input signal in the analog domain and pass BCI trials. The

differential filter cut-off frequency is

fC= 1

4πRLPFCLPF

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.

CLPF

10%

50 V

LPF capacitor for cell voltage measurement. The differential

filter cut-off frequency is

fC= 1

4πRLPFCLPF.The

capacitors also allow better energy distribution during hotplug

events. Do not modify this value, since it alters cell open

diagnostic settling time.

CESD

10%

100 V

Protect against ESD events and ISO spikes. Connect to

GND_ESD.

FRSNS

kΩ

@100 MHz

1 A @ 125 °C

Add robustness against BCI. Guarantees fail safe in case

of open on busbar (refer to Figure 34 as an example).

MPZ2012S102ATD25 is recommended.

L9963E

Cell voltage sensing circuit

DS13636 - Rev 12

page 135/184

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