SS6782G datasheet(12/19 Pages) SSC

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SS6782G

9/21/2005 Rev.3.01

TABLE 1

(d) 0.3V> SEL3

Acceptable ABV/BBV Range:

BATTERY

CELLS

RA/RB

RA k

Ω

RB k

Ω

2~4

240

120

3~6

3.3

300

4~8

4.9

300

5~10

6.4

300

6~12

7.8

310

8~16

10.8

390

Before initial timer: 0.16V~2 V

After initial timer:1.2V~2V

Temperature Protection Mode:

If temperature is too high, battery charging

is regarded as complete. If temperature is

too low, the

∆ t/∆ t detection function is

disabled, just as if the thermistor did not exist.

For SEL3 < ((VCC/2) -0.4V), the suggested divider

resistances of RA and RB for the corresponding

number of battery cells are shown below:

Battery Voltage Measurement

The SS6782G measures the battery voltage

through ABV and BBV pins, which are connected

to the battery positive terminals through a resistor-

divider network, as shown in Fig. 14. The ac-

ceptable limit of divided battery voltage is de-

termined by the input voltage of SEL3 pin.

TABLE 2

BATTERY

CELLS

RA/RB

RA (k

Ω ) RB (kΩ )

240

120

240

300

360

390

410

VBAT

100K

SS6782G

ABV/BBV

Fig. 14 Battery Voltage Divider

Battery Temperature Measurement

For SEL3 > ((VCC/2) + 0.4V), the suggested

vider resistances of RA and RB for the corre-

sponding number of battery cells are as below:

The SS6782G employs a negative temperature

coefficient (NTC) thermistor to measure the bat-

tery

’s temperature. The thermistor is inherently

nonlinear with respect to temperature. To re-

duce the effect of nonlinearity, a resistor-divider

network in parallel with the thermistor is rec-

ommended. A typical application circuit is

shown in Fig. 15.

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