SS6821 datasheet(6/10 Pages) SSC

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SS6821

BLOCK DIAGRAM

Power-down

Control

Wake-up Control

-0.3V

VCC

Overdischarge

Delay Circuit

Overcharge

Delay Circuit

Overcurrent

Delay Circuit

Enable

Load Detected

0.3V

0.2V

GND

1.2V

PIN DESCRIPTIONS

PIN 1: OC

- PMOS open drain output for control

of the charge control MOSFET M2.

In normal mode, this PMOS turns

on to pull the gate of the MOSFET

M2 high, and the MOSFET M2 turns

on. When over-charge occurs, this

PMOS turns off, no current flows

through R3 and the MOSFET M2

turns off.

PIN 2: GND - Ground pin. This pin is to be

connected to the negative terminal

of the battery cell.

PIN 3: OD

- Output

for

control

the

discharge

control

MOSFET

M1.

When over-discharge occurs, this

goes

low

turn

off

the

MOSFET M1 and discharging is

halted.

PIN 4: CS

- Input pin for current sensing. Using

the

sum

the

drain-source

voltages of the MOSFET M1 and

the MOSFET M2 (voltage between

and

GND),

senses

the

discharge current during normal

mode and detects whether charging

current is present during the power-

down mode. It is also used to detect

whether

the

load

connected

during over-charge mode.

PIN 5: VCC - Power supply pin. This pin is to be

connected to the positive terminal of

the battery cell.

12/6/2004 Rev.2.02

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