BATTERY PROTECTION IC FOR 3-SERIAL-CELL PACK

S-8233C Series

Seiko Instruments Inc.

2

Block Diagram

Battery 1

Over charge

Battery 3

Over discharge

Battery 3

Over charge

Battery 2

Over charge

Battery 2

Over discharge

Over charge

delay circuit

Battery 1

Over discharge

Reference

voltage 3

Reference

voltage 2

Reference

voltage 1

Control

Logic

Over current

detection

circuit

Over discharge

delay circuit

Over current1‚

delay circuit

Over current

2,3 delay

circuit

-

+

-

+

-

+

-

+

-

+

-

+

DOP

VMP

COVT

CDT

CCT

COP

CTL

VSS

DSO

VC2

ISO

CSO

VC1

VCC

Floating

detection circuit

Over

charge

Over

current

Over

discharge

Figure 1

The delay time for over current detection 2 and 3 is fixed by an internal IC circuit. The delay time cannot

be changed via an external capacitor.

terminal goes high.

terminal goes high.

If S-8233C series detect over current, the ISO terminal goes high.

In normal state each terminal output ‘Low’.