CMOS IC Application Note

S-8209B Series Usage Guidelines

Seiko Instruments Inc.

3

1. Protection circuit with S-8209B Series (without discharge cell-balance function)

for series multi-cells

In the connection of the S-8209B Series, connecting the CTLC, CTLD pins to the CO, DO pins allows to configure a

protection circuit for series-connected batteries.

1. 1 Connection example of battery protection IC

Figure 1 shows the example of protection circuit with S-8209B for series multi-cells.

P

+

P

−

CFET

BAT1

BAT2

BAT3

DFET

CBFET3

CBFET2

CBFET1

VSS2

VDD

CB2

DO2

CO2

CTLD2

CTLC2

S-8209B(2)

CDT

VSS1

VDD

CB1

DO1

CO1

CTLD1

CTLC1

S-8209B(1)

CDT

VSS3

VDD

CB3

DO3

CO3

CTLD3

CTLC3

S-8209B(3)

CDT

Remark Refer to “4. External components list” for constants of external components.

Figure 1

Caution 1. The above constants may be changed without notice.

2. The example of connection shown above and the constant do not guarantee proper operation.

Perform thorough evaluation using the actual application to set the constant.