AXP209 datasheet(21/45 Pages) ETC2

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AXP209

Enhanced single Cell Li-Battery and Power System Management IC

In non-precharge mode, if the charge cycle is not ending after 480 minutes (adjustable, refer to

Battery activation mode

At the entering the battery activation mode from either pre-charge mode or constant current mode (the

timer expires), AXP209 will issue IRQ10 in both cases to indicate that the battery may be

damaged/faulty. In battery activate mode, the charger always inputs relatively low current to batteries.

AXP209 will exit activate mode and release IRQ11 only if the battery voltage has reached VRCH.

AXP209 will indicate whether the charger is in battery activate mode or not in register REG01H.

CHGLED

CHGLED pin is used to indicate charge state and warning. There are four states, namely, charging,

not charging, battery abnormal warning, and external power over-voltage warning. CHGLED is NMOS

Open Drain output, so a LED can be directly driven by a current-limit resistor to show the four states.

The following table has displayed its two operation modes.

REG34H

[4]

Status

CHGLED

State

Comments

Charging

Low

Not

charging

Hi Z

Battery

abnormal

1Hz

Flashing

The charger enters the battery activate mode, or

the battery temperature is too high/low.

Overvoltage

4Hz

Flashing

External power input voltage is too high

Charging

1Hz

Flashing

Can not be

charged

No external power supply

Not

charging

Low

Overvoltage

4Hz

Flashing

External power input voltage is too high, or the

battery temperature is too high, too low

Battery temperature detection

The AXP209 can connect a temperature-sensitive resistor via the TS pin to monitor the battery

temperature when the battery is charging or discharging. The diagram is shown below.

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