AXP288D datasheet(22/110 Pages) XPOWER

22 / 110 page

AXP288

PMIC Optimized For Multi-Core High-Performance System

AXP288 Datasheet V1.06

9 Control and operation

When AXP288 works, the TWSI (two wire serial interface) SCK/SDA pin is pulled up to system IO power, and this interface

can be used by HOST to access and adjust AXP288’s working status.

Note that the external power hereinafter is VBUS input.

9.1 Power on/off and Power sequences

PMIC has power off and power on status. When at off state, all voltage outputs are turned off except VCC_RTC, VINT and

charger. At this time if powered by battery, the total power consumption is typically 40uA.

9.1.1 Power on/off sources

Power on source

Below are the 3 power up sources supported by AXP288 in mechanical off state:

1. Charger insertion (VBAT > VBPTH)

2. Battery insertion (VBAT > VBPTH)

3. Power on key pressed (VBAT > VBPTH)

Note：VBPTH (boot threshold), 3.0-3.45V, 150mV/step, 4 steps, default is 3.15V.

Power off source

Below are the few sources that can trigger power down of PMIC:

1. ALDOIN <

VOFF ( indicating IPSOUT too low)

2. Faulty condition

3. Power on key pressed

4. BYT/CHT cold off

Power on from charger insertion

The PMIC should be able to start the boot sequence from a charger insertion. A charger insertion is detected from a rising

voltage on the VBUS node. If 4.1V< VBUS < 7.0V, the charger will start charging immediately and autonomously. If the battery

level is above the battery boot threshold, the PMIC will continue the boot process, otherwise the charger will continue

charging until the battery boot threshold is reached at which point the PMIC will continue the boot process.

AXP288D 데이터시트(PDF) 22 Page - Shenzhen X-Powers Technology Co ., Ltd