SS6782G datasheet(9/19 Pages) SSC

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SS6782G

9/21/2005 Rev.3.01

PIN 14: SEL2

- Tri-level inputs, which jointly

control the LED display mode

and the duty of trickle charge

after the completion of fast

charge.

PIN 9: ATS

- The battery cell temperature of

pack A is represented as a voltage

input to the SS6782G on this pin.

he acceptable voltage range of

the ATS pin is 0.29Vcc to 0.72Vcc.

PIN 15: SEL1

- The same as pin 14.

PIN 10: LEA1 - Open-draind outputs used to

indicate the charging status of

the battery pack A.

PIN 16: GND

- Power ground.

PIN 17: LEB1

- Open-drain outputs used to

indicate the charging status of

battery pack B

PIN 11: LEA2 - The same as pin 10.

PIN 12: ICOA - Open-drain output, used to

control the charging current of

the battery pack A.

PIN 18: LEB2

- The same as pin 17.

PIN 19: ICOB

- Open-drain output, used to

control the charging current of

the battery pack B.

PIN 13: MODE - Determines the operating mode

the SS6782G.

PIN 20: DSW

- Controls the function of

dis

charge-before-charge of the

battery pack B.

(See discharge-

before-charge

subsection in the application

information section).

APPLICATION INFORMATION

OPERATION

Power-on and Battery Pre-qualification

The SS6782G is a sequential charger, initiating

charging on either battery pack A or B.

When power is first applied to the SS6782G, all

internal digital circuits of the SS6782G are reset

by the internal power-on-reset circuitry, and the

out

put of LED‘s (depending on the setting of

SEL1

and SEL2 pins) flash 3 times to indicate the

ini

tiation of power-on. If both battery pack A and

are present when V CC is applied to the SS6782G,

the charging action begins with battery pack A

conditions are acceptable.

The c

ondition of battery pack A is examined

through the ATS and ABV pins, while battery

pack B is examined through the BTS and BBV

pins. The acceptable limits of ABV and BBV are

determined by the input voltage of SEL3 pin

and the acceptable temperature sense voltage

window for ATS and BTS of 0.29Vcc to 0.72Vcc.

The SS6782G controls initiation of the charging

action and checks for acceptable battery volt-

age and temperature prior to fast charging. If

the voltage of ABV or BBV does not fall within the

predetermined acceptable limits, the corre-

sponding battery pack enters a charging-

suspended mode. If the voltage of ATS or BTS

is outside the 0.29VCC to 0.72VCC window, the

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