AXP223 datasheet(21/56 Pages) ETC2

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AXP223

PMIC Optimized For Multi-Core High-Performance System

AXP223 Datasheet Revision 1.1

PAGE

9.3. Adaptive Flash Charger

AXP223 integrates a adaptive Flash charger to automatically control the charge cycle, with a built-in safety clock capable of automatic

charge termination without processor intervention. This charger features automatic charge current scaling in accordance with the system

power consumption, as well as battery detection, trickle charge and activation. In addition, the built-in temperature detection circuit can

automatically decrease the charge current when the temperature is too high or too low.

9.3.1.

Adaptive Charge Startup

The default state of the charger is “Enable”. (It can be programmed via registers. Refer to register REG33H.) When

external power is plugged in, AXP223 will firstly judge whether it is chargeable. If the charger is suitable for the power, and

the charge function is usable, AXP223 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：

9.3.2.

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,

AXP223 will automatically adjust the charge target voltage when external power voltage is low. VRCH=automatic recharge voltage.

VRCH=VTRGT-0.1V.

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

9.3.3.

Charge Current

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

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