AXP202 datasheet(20/48 Pages) ETC2

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Single Cell Li-Battery PWM Charger and Power System Management IC

AXP202

The default state of the charger is “Enable”. (It can be programmed via registers. Refer to register

REG33H.) When external power is plugged in, AXP202 will firstly judge whether it is chargeable. If the

charger is suitable for the power, and the charge function is usable, AXP202 will automatically start the

charge, and send IRQ to Host for indication. At the same time, GHGLED pin will output low level to

drive external LED to indicate the charging state.

Charge Voltage/Current

ITRKL

VTRKL

ICHRG

VTRGT

Two Symbolic Voltages

VTRGT=charge target voltage. The VTRGT is 4.2V by default, which can be set by register (Refer

to“REG33H[6:5]”) . At the same time, AXP202 will automatically adjust the charge target voltage when

external power voltage is low.

VRCH=automatic recharge voltage. VRCH=VTRGT-0.1V。

Charge Current

The charge current is 500mAor 1200mA by default, which can be set by REG33H [3:0].

Charge Process

If the battery voltage is lower than 3.0V, the charger will automatically enter the pre-charge mode, with

charge current be 1/10 of the preset value. If the battery voltage is still below 3.0V 40 minutes later

(adjustable, see “REG34H”), charger will automatically enter the battery activate mode. Refer to

“Battery Activate Mode” section for details.

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