AXP202 datasheet(14/48 Pages) ETC2

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

AXP202

． Control and Operation

Once AXP202 is powered on, SCK/SDA pin of TWSI will be pulled up to IO Power and then Host can

adjust and monitor AXP202.

Remarks: “Host” here refers to system processor.

Remarks: “External Power” below includes ACIN and VBUS input.

9.1 Power On/Off & Reset

Power Enable Key (PEK)

The Power Enable/ Sleep/Wakeup Key can be connected between PWRON pin and GND of AXP202.

AXP202 can automatically identify the “Long-press” and “Short-press” and then correspond

respectively.

Power on Source

1. ACIN、VBUS and battery

2. N_OE changes from high to low

3. PEK

Power On

System power-on is initiated whenever the following conditions occur:

1. N_OE is low and a valid power source has plugged in (ACIN or VBUS>3.8V, and battery voltage is

higher than power off voltage), AXP202 will be turned on. ( Developer can decide whether AXP202

shall be turned on when there is a valid power source plugging in)

2. N_OE is low and the system is powered off, press PEK can power on AXP202 (In application, Host

Alarm output signal can be connected to PWRON and parallel with PEK. Whenever there is a valid

Alarm signal ((Low Level)), AXP202 can be powered on).

3. When there is a external power source or battery, when N_OE changes from high to low, AXP202

will be turned on.

After power on, DC-DC and LDO will be soft booted in preset timing sequence, and then either Host or

PWREN pin can enable/disable corresponding power.

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