AXP202 datasheet(25/48 Pages) ETC2

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

AXP202

All DC-DCs and LDOs support load monitoring and current-limit functions. When the load current

exceeds its drive ability, all output voltage will decrease to protect the internal circuits. When the two

DC-DCs output voltage is lower than 85% of the set voltage, AXP202 will automatically shutdown. At

the same time, the system will record the detailed output voltage that has lead to automatic shutdown

(refer to register REG46H[5:2]) and release corresponding IRQ.

All DC-DCs do not require external Schottky diodes and resister divider feedback circuits. If a certain

DC-DC is unnecessary in application, just float the corresponding LX pins.

9.6 Default Voltage/Timing Setting

The default voltage and boot timing of each power can be set by AXP202.

Boot Timing includes eight levels, and the interval between each level can be set as 1、4、16 and

32mS.

Default voltage setting: each DC-DC/LDO setting ranges from the lowest voltage to the highest

voltage.

DC3SET PIN is used to set the prelimirary voltage of DC-DC3：

DC3SET

DC3SETGND

DC3SETto OAPS

DC3SET floating

DC-DC3 voltage

1.8V

3.3V/2.5V

1.2V/1.5V

9.7 Signal Capture

Ordinary battery monitor estimate the battery energy by measuring the battery voltage. However, the

multiple 12-bit ADCs in AXP202 can measure battery voltage, as well as battery current and external

power voltage and current. It also integrates battery charge and discharge coulomb counter. According

to these data, Host is capable of calculating accurately the battery energy and other battery data, such

as the system real-time consumption, remaining battery energy, battery charge progress, remaining

battery using time and charge time, etc.

The Enable state controlling and sampling rate of each ADC can be set via registers REG82H、83H、

84H. The sampling results will be saved in corresponding registers，and reference can be made to the

ADC data in Register Instruction section. The input range of GPIO[1:0] can be set via register REG85H

while register REG00H[2] is used to indicate the battery charge/discharge current directions.

Channel

000H

STEP

FFFH

Battery Voltage

0mV

1.1mV

4.5045V

Bat discharge current

0mA

0.5mA

4.095A

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