SS6783ACNTB datasheet(10/12 Pages) SSC

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SS6783A(G)

1/11/2005 Rev.2.10

TABLE 2

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 SS6783A provides three modes of operation:

normal, test, and AC mode determined by the

setting of MODE pin. The SS6783A will operate

normally when the MODE pin is left floating (a

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

SS6

783A enters the test mode. The test mode can

be used to significantly reduce production test time.

TABLE 3

MODE pin

Mode

Function

VCC

Test

Safety timer period

scaled down to 1/32

Floating

Normal Normal operation

GND

∆V detection disabled

Display the Battery Charging Status

The SS6783A provides an open-drain output at the

LED pin, to indicate the battery charging status. The

outputs of LED pin are shown in the following table:

Power

Fast

Charging

Charge

Completed

Fault

Conditions

LED

1Hz

4Hz

Flashing

OFF

Charging Current Control

As shown in the typical application circuit, the

SS6

783A offers an open-drain output at the ICON

pin, to control the charging current flow in fast

charge state and switch on to inhibit the charging

current flow in fault conditions. When fast charge is

completed, the SS6783A enters the trickle charge

mode. In trickle charge mode, the ICON pin output

switches with 1/128 duty cycle.

Power

Fast

Charging

Charge

Completed

Fault

Conditions

ICON

OFF

1/128

Duty cycle

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