SS6782G datasheet(15/19 Pages) SSC

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SS6782G

9/21/2005 Rev.3.01

for some of the commonly chosen safety timer

periods. Also shown in the table is their corre-

sponding oscillator frequencies.

100

200

300

400

500

200

400

600

800

Safety Timer (min.)

Fig. 16 Safety Timer vs RTMR

TABLE 7

RTMR

Ω)

Osc.Freq.

(kHz)

Safety timer

(min.)

262.4

131.2

65.6

43.7

100

32.8

152

21.9

120

206

16.4

160

314

10.9

240

491

7.3

360

667

5.5

480

Selecting Mode of Operation

The SS6782G provides three modes of opera-

tion: normal, test, and AC mode, determined by

the setting of the MODE pin according to TABLE 8.

The SS6782G will operate normally when the

MODE pin is left floating (a 0.1

µF capacitor is

recommended to be tied to the MODE pin if the

charging circuit works in a noisy environment).

When the MODE pin is biased to GND, the

function of

−

detection is disabled. When

the MODE pin is biased to V

∆

CC, the SS6782G

enters the test mode. The test mode can be

used to significantly reduce production test time.

For relevant information, please contact SSC di-

rectly.

TABLE 8 The Operating Mode of SS6782G

MODE pin

Mode

Function

VCC

Test

Safety timer period

scaled down to 1/32....

etc.

Floating

Normal Normal operation

GND

∆V detection disabled

The LED Display and Trickle Charge Modes

The SS6782G provides two LED display modes

and five pulsed trickle charge modes. The

modes of LED display and trickle charge are

determined by the tri-level inputs, SEL1 and

SEL2 pins, as in the TABLE 9.

TABLE

9 Mode of LED Display and Trickle

Charge

SEL1

SEL2

Trickle

Charge

Duty

LED

Display

Mode

VCC

Floating

GND

N/A

1/32

1/64

Type 1

Floating

VCC

Floating

GND

1/128

1/256

N/A

Type 1

Type 2

GND

VCC

Floating

GND

1/32

1/64

1/128

Type 2

Displaying the Battery Charging Status

The SS6782G provides four open-drain outputs,

in which LEA1 and LEA2 are used to indicate the

battery charging status of pack A, and LEB1 and

LEB2 are used to indicate battery charging status

of pack B. Refering to the table of LED display modes

(TABLE 6), depending on the setting of SEL1

and SEL2 pins, the outputs of LEA1, LEA2, LEB1,

and LEB2 pins are shown in the following table:

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