SS6782G datasheet(11/19 Pages) SSC

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SS6782G

9/21/2005 Rev.3.01

ABV/BBV Range and Temperature Protection

once every 8 seconds, which is also determined

by the safety timer.

The acceptable battery voltage range of ABV and

BBV pins and the mode of temperature protection

function is determined by the voltage of the

SEL3 pin, shown as the following:

The

∆V detection and peak voltage timer (0

∆V)

functions

can be disabled if the MODE pin is

biased to GND. The

∆ T/∆ t function can be

disabled if the voltage of the ADJ pin is higher

than (Vcc-0.3V).

(a) SEL3 > VCC - 0.3V

Acceptable ABV/BBV Range:

Before initial timer: 0.16V~2.7V

After initial timer: 0.69V~2.7V

Maximum Safety Timer Cutoff

The maximum fast charge period is determined

by the safety timer, which is set by a resistor

connected from TMR pin to GND. Safety timer,

∆V sampling rate, and ∆

∆

T/ t sampling rate

will be longer if the resistor value is larger.

When the value of the resistor is 100k

Ω, the

safety timer period equals 80 minutes. This can

be verified by biasing the MODE pin to VCC and the

measured frequency on DSW pin should be

around 32.8 KHz. After the safety timer period

is finished, the fast charge action is terminated.

Temperature Protection Mode:

Enters charging-suspended mode when tem-

perature is either too low or too high, same as

abnormal battery voltage. Latch for charge-

suspending function is provided for high tem-

perature protection, but not for low temperature

protection.

(b) VCC - 1.4V> SEL3 >

- 0.4V

Acceptable ABV/BBV Range:

Before initial timer: 0.16V~2.7V

Maximum Voltage and Temperature Cutoff

After initial timer: 0.69V~2.7V

The SS6782G guards against the maximum lim-

its for battery voltage and temperature during

fast charging. If either of these limits is ex-

ceeded, fast charge action is terminated.

Temperature Protection Mode:

If temperature is too high, battery charging

is regarded as completed. If temperature is

too low, function of ∆

detection is

disabled, just as if the thermistor did not exist.

∆

T/ t

Trickle Charge

(c)

- 0.4V>SEL3 >1.4V

There are five different selectable duty cycles

for trickle charging after fast charging to pre-

vent the loss of charge due to battery self-

discharging. The setting of SEL1 and SEL2 pins

controls the duty cycle

. This function can only

be activated in the following three situations:

Acceptable ABV/BBV Range:

Before initial timer: 0.16V~2 V

After initial timer: 1.2V~2V

Temperature Protection Mode:

Battery pack A is fully charged and battery

pack B is abnormal.

Enters the charging-suspended mode when

temperature is too low or too high, same

as abnormal battery voltage. Latch for

charging-suspended function is provided for

high temperature protection, but not for low

temperature protection.

Battery pack B is fully charged and battery

pack A is abnormal.

Battery pack A and B are both fully charged.

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