AXP223 datasheet(20/56 Pages) ETC2

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AXP223

PMIC Optimized For Multi-Core High-Performance System

AXP223 Datasheet Revision 1.1

PAGE

The following table has listed the status bits and meanings of external power registers:

Description

REG00_[7]

Indicating the presence of external ACIN

REG00_[6]

Indicating whether the external ACIN is usable or not

REG00_[5]

Indicating the presence of external VBUS

REG00_[4]

Indicating whether the external VBUS is usable or not

REG00_[3]

Indicating whether the VBUS voltage is above VHOLD when used

REG00_[1]

Indicating whether ACIN/VBUS short circuits on PCB or not

REG00_[0]

Indicating whether the system is triggered to startup by ACIN/VBUS

or not

“

The status bit of “indicating whether the VBUS voltage is above VHOLD or not when used” enables the Host to

judge when it receives IRQ7(indicating weak supply ability)whether VBUS is pulled low by system load input or the

external power itself is below VHOLD, which may facilitate Host software to decide either to keep on working in

Voltage-Limit mode or switch to Direct mode.

9.2.3.

When to Select VBUS as Input Power

N_VBUSEN and register REG30H[7]、REG30_[2]、REG8F_[4] is used to determined when shall VBUS be used

as power supply :

REG30_[7]

REG8F_[4]

N_VBUSEN

REG30H[2]

YES/NO

High

Low

Yes

High

Low

Yes

Note: X represents any state and any value

9.2.4.

Low-Power Protection (Automatic Power off)

With AXP223, the value of VOFF(automatic shutdown voltage) can be set,If the system power is found ALDOIN is lower than VOFF,

AXP223 will automatically enter Shutdown Mode,and disable all other outputs except VCC-RTC.

The default value of VOFF

can set in register REG31H Bit[2:0] .

9.2.5.

Over-Voltage Protection

If the external power voltage exceeds 6.3V, AXP223 will release IRQ1/4 for indication. If the external power voltage exceeds 7V,

AXP223 will automatically shutdown the system.

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