AXP202 datasheet(21/48 Pages) ETC2

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

AXP202

Once the battery voltage exceeds 3.0V, the charger enters constant current mode. If the charge current

is below 65% of the preset value, the system will release IRQ17 to indicate that “drive ability of external

power is insufficient, as a result, the charge current is lower than the preset value, which may lead to

longer charge time, so stronger power is preferred, or the power-consuming functions should be

disabled to shorten the charge time.”

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 AXP202 will release IRQ18 while the CHGLED pin will stop indicating

the charging state. When the battery voltage is below VRCH again, the automatic charge will restart, and

IRQ17 will be released.

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

“REG34H”), the charger will automatically enter the battery activate mode.

Battery Activate Mode

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

timer expires), AXP202 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. AXP202 will exit

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

AXP202 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

Performance Remark

Charging

Low Level

Not charging

High

Resistance

Battery

Abnormal

1Hz flicker

The charger enters the battery activate mode, or

the battery temperature is too high/low.

Over-Voltage

4Hz flicker

External voltage input is too high.

Charging

1Hz flicker

Non-chargeable High

No external power is available.

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