ACE4702

2 Cell Li-ion Battery Charger IC

VER 1.1

9

quickly, then the BAT pin’s voltage decays slowly to recharge threshold because of low leakage current at

BAT pin, which results in ripple waveform at BAT pin, in the meantime, CHRG pin outputs a pulse to

indicate that the battery’s absence. The pulse’s frequency is around 10Hz when a 10uF output capacitor

is used.

The open drain status output that is not used should be tied to ground.

The table 1 lists the two indicator status and its corresponding charging status. It is supposed that red

LED is connected to CHRG pin and green LED is connected to DONE pin.

CHRG Pin

DONE pin

State Description

Low (The red LED on)

High Impedance (the green

LED off)

Charging

High Impedance (the red

LED off)

Low (the green LED on)

Charging termination

Pulse signal

Pulse signal

Battery not connected

High Impedance (the red

LED off)

High Impedance (the green

LED off)

There are three possible state:

UVLO level

 * abnormal battery’s temp

Table 1 Indication Status