BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK

S-8232 Series

Seiko Instruments Inc.

2

Block Diagram

Auxiliary

overcharge

detector 1

Reference

voltage 1

DO, CO control signal

CO

DO

ICT

VM

VSS

VC

SENS

VCC

RCOL

Overcharge

detector 1

Over-

discharge

detector 1

Over-

discharge

detector 2

Overcharge

detector 2

Auxiliary

overcharge

detector 2

Reference

voltage 2

Control

logic

Delay circuit

control signal

Delay circuit control signal

Delay circuit

control signal

Delay circuit

Delay circuit

control signal

Over current

detection circuit

−

+

−

+

−

+

+

−

+

−

+

−

Remark

Resistor (RCOL) is connected to the Nch transistor although CO pin serves as a CMOS output.

For this, impedance becomes high when outputting “L” from CO pin. Refer to the “

Electrical

Characteristics

” for the impedance value.

Figure 1