L9961 datasheet(49/65 Pages) STMICROELECTRONICS

49 / 65 page

5.2

Cell voltage sensing and balancing circuit

Figure 17. Cell voltage sensing and balancing circuit

GADG220620221356SA

Cx-1

RLPF

CLPF

Table 34. Typical BOM for cell voltage sensing and balancing circuit

Components Value Unit

Max.

tolerance

Rating

Comments

RLPF

Ω

10%

1/8 W

LPF resistor for cell voltage measurement. It is used also to limit

the balancing current. The differential filter cut-off frequency is

fC= 1

4πRLPFCLPF

CLPF

470

10%

16 V

LPF capacitor for cell voltage measurement. The differential filter cut-

off frequency is

fC= 1

4πRLPFCLPF

5.3

Current sense circuit

Figure 18. Current sense circuit

GADG220620221357SA

CISENSE_CM

CISENSE_1

CISENSE_2

RISENSE

L9961

ISENSEP

ISENSEM

Table 35. Typical current sense BOM

Components Value Unit

Max.

tolerance

Rating

Comments

RSHUNT

mΩ

3 W

Shunt resistor used for current sensing and coulomb counting. Rating

depends on the maximum battery current (RSHUNT * ISENSE_MAX2). Different

RSHUNT values are possible as long as RSHUNT * ISENSE stays in

the differential measurement range [-200; +200] mV and the ISENSEp/

ISENSEm AMR are not violated

L9961

Cell voltage sensing and balancing circuit

DS14012 - Rev 3

page 49/65

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