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AXP223

PMIC Optimized For Multi-Core High-Performance System

AXP223 Datasheet Revision 1.1

PAGE

9.3.4.

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.

When the battery voltage reaches the VTRGT, the charger will switch from the constant current mode to constant voltage mode,

and the charge current will fall

When the charge current is lower than 10% or 15% (adjustable, see register “REG33H”) of the preset value, a

charge cycle ends, and AXP223 will release IRQ13 while the CHGLED pin will stop indicating the charging state.

When the battery voltage is below V

RCH

again, the automatic charge will restart, and IRQ12 will be released.

9.3.5.

Battery Activate Mode

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

timer expires), AXP223 will release IRQ10 in both cases to indicate that the battery may be damaged.

In battery activate mode, the charger always inputs relatively low current to batteries. AXP223 will exit

activate mode and release IRQ11 only if the battery voltage has reached V

RCH

AXP223 will indicate whether the charger is in battery activate mode or not in register REG01H.

9.3.6.

CHGLED

CHGLED pin is used to indicate charge state and 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

Type A

Status

Performance

Remark

Charging

Low Level

Not Charging

High Resistance

Battery Abnormal

25% duty 1Hz

flicker

The charger enters the battery activate mode, or

the battery temperature is too high/low.

Over-Voltage

25% duty 4Hz flicker

External voltage input is too high

Type B

Status

Performance

Remark

Charging

25% duty 1Hz

flicker

Not Charging

High Resistance

Battery Abnormal

Over-Voltage

25% duty 1Hz

flicker

The charger enters the battery activate mode, or

the battery temperature is too high/low.

voltage output is too high

No battery

Low Level

No external power is available.

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