AXP288D datasheet(24/110 Pages) XPOWER

24 / 110 page

AXP288

PMIC Optimized For Multi-Core High-Performance System

AXP288 Datasheet V1.06

POK, PMIC timer will start counting the hold time. POK signal has to be low for at least 32ms for it to be considered a valid

signal. If the power on key hold time exceeds the timer threshold (ONLEVEL determined by REG36H [7:6]), the PMIC will

continue to boot as long as the battery voltage is above the battery boot threshold. Otherwise the PMIC will remain off.

Off State

Power Button

Pbutton Timer >

turn on time?

Standby State (S0iX)

Shutdown

PMIC Boots to

standby state

yes

SoC de-asserts

SLP_S0IX_B Pin

Active State (S0)

PMIC completes

boot process asserts

PWRGOOD signals

SoC Boots OS

Battery level >

boot threshold?

Figure 9-3

Power off from ALDOIN< VOFF

PMIC will constantly monitor voltage level of ALDOIN which is connected to IPSOUT. When VALDOIN < VOFF (default is 2.9V,

set in REG 31H[2:0]), PMIC will force shutdown. There will be 500us de-bounce circuit for ALDOIN detection and adjusted

hysteresis voltage to prevent false trigger. After force shutdown occurred, PMIC will remain off and wait for power on event to

boot up.

VOFF and the compensated hysteresis voltage as below:

Table 9-1

VOFF condition

VX condition ( Hysteresis)

VOFF<=3.0V

0.3V

VOFF = 3.1V

0.2V

VOFF = 3.2V or 3.3V

0.1V

Power off due to faulty condition

PMIC will force shutdown once faulty event happened. Faulty event includes VBUS>7V, PMIC internal temperature

exceeds warning level3 (set in REG 8FH [2]) and buck output drop more than 15% than the targeted output voltage (set in Reg

81H).

Power off by power on key pressed

Once power on key pressed, POK signal assert low and need to remain low for 32ms to be considered valid. PMIC has

configurable timer to detect power on key hold time. If POK remain low for less than IRQLEVEL (set in REG 36H [5:4]), POKSIRQ

will be set. For POK hold time > IRQLEVEL, POKLIRQ will be set. Typically, the system uses POKLIRQ to allow user to express

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