SS6781ACSTR datasheet(8/18 Pages) SSC

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SS6781A(G)

1/11/2005 Rev.2.10

PIN DESCRIPTIONS

PIN 1: PEAK- Tri-level input, determining the

period of peak voltage timer.

(See 0

∆V cut-off section in

Application Information.)

PIN 2: VBT-

Divided battery voltage input to

sense the battery voltage.

PIN 3: DIS-

Push-pull

output,

used

control an external transistor to

discharge the battery. DIS is

active-high when the SS6781A

enters discharge mode.

PIN 4: VTS-

The battery cell temperature is

represented as a voltage input

to the SS6781A at this pin.

The acceptable voltage range of

VTS pin is 0.29VCC to 0.72Vcc

The battery temperature is

regarded as too high if the

voltage of VTS pin is lower than

0.29VCC, and is otherwise

regarded as too low if the

voltage of the VTS pin is

higher than 0.72VCC.

PIN 5: VCC-

Power supply input at 5V

±10%.

PIN 6: ADJ-

For adjusting the slope of

∆T/∆t.

Acceptable voltage range for

this pin is approximately 0.28V

to 3.8V.

If higher than VCC-0.3V, then

∆T/∆t detection is disabled.

PIN 7: SEL3-

Determines the acceptable

voltage range of VBT pin and

mode of temperature protection

function.

PIN 8: TMR-

Determines the period of safety

timer with an external resistor

connected to GND.

PIN 9: MODE- Determines the mode of

operation for the SS6781A.

PIN 10: SEL2 - Tri-level

inputs,

that

jointly

control the LED display mode

and the duty of trickle charge

after the completion of fast

charge.

PIN 11: SEL1- The same as Pin 10.

PIN 12: GND-

Power ground.

PIN 13: LED1 &

PIN 14: LED2- Open-drain outputs used to

indicate the battery charging

status. Two modes of display

are available, depending on

the setting of SEL1 and SEL2

pins.

PIN 15: ICON- Open-drain output, used to

control the charging current to

the battery.

PIN 16: DSW- Controlling

the

function

discharge-before-charge.

(See discharge-before-charge

subsection in Application

Information).

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