SS6781ACSTR datasheet(15/18 Pages) SSC

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SS6781A(G)

1/11/2005 Rev.2.10

(b) VCC - 1.4V> SEL3 >

+ 0.4V

Acceptable VBT Range:

Before initial timer: 0.16V~2.7V

After initial timer: 0.69V~2.7V

Temperature Protection Mode:

If temperature is too high, battery charging is

regarded as completed. If temperature is too

low, function of

∆T/∆t detection is disabled, just

as thermistor is not existing.

(c)

- 0.4V>SEL3 >1.4V

Acceptable VBT Range:

Before initial timer: 0.16V~2V

After initial timer: 1.2V~2V

Temperature Protection Mode:

Entering

charge-suspending

mode

when

temperature is either too low or too high, same

abnormal

battery

voltage.

Latch

for

charge-suspending function is provided for high

temperature

protection,

but

not

for

low

temperature protection.

(d) 0.3V> SEL3

Acceptable VBT Range:

Before initial timer: 0.16V~2V

After initial timer: 1.2V~2V

Temperature Protection Mode:

If temperature is too high, battery charging is

regarded as completed. If temperature is too

low, function of

∆T/∆t detection is disabled, just

as thermistor is not existing.

Setting the Period of Safety Timer

The SS6781A provides a method for linearly

adjusting the period of safety timer with an external

resistor connected from TMR pin to GND. The

relation between safety timer length and the

external resistor (RTMR) is shown in Fig. 19. The

table following shows the resistor values for some

of the commonly chosen safety timer periods. Also

shown

the

table

are

their

corresponding

oscillator frequencies.

100

200

300

400

500

200

400

600

800

Safety Timer (min.)

Fig. 19

Safety Timer vs. RTMR

TABLE 8

RTMR (kΩ)

OSC.

Freq.(KHz)

Safety timer

(min.)

256

131

65.8

43.1

100

32.8

152

21.6

120

206

16.0

160

314

10.6

250

491

6.89

380

667

5.04

520

Selecting Mode of Operation

The SS6781A provides three modes of operation:

normal, test, and AC mode determined by the

setting of MODE pin according to TABLE 9. The

SS6781A will operate normally when the MODE

left

floating

0.1

µF capacitor is

recommended to be tied to MODE pin if the charge

circuit works in a noisy environment). When the

MODE pin is biased to GND, the function of -

∆V

detection is disabled. When the MODE pin is

biased to VCC, the SS6781A enters the test mode.

The test mode can be used to significantly reduce

production test time. For relevant information,

please contact SSC directly.

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