AXP202 datasheet(19/48 Pages) ETC2

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

AXP202

supply.

N_VBUSEN

REG30H[7]

Input Power

Description

Low

VBUS

Select if VBUS is valid and no ACIN is

available

Low

VBUS

High

VBUS

select if VBUS is valid

High

ACIN/BAT

Not select VBUS

Low-Power Warning and Low-Power Protection (Automatic Poweroff)

With AXP202, the value of VWARNING(low-power warning voltage) and VOFF(automatic shutdown voltage)

can be set. If the system power is found to be lower than VWARNING, IRQ19/IRQ20 will be released. If

APS is lower than VOFF, AXP202 will automatically enter Shutdown Mode, and disable all other outputs

except LDO1.

There are two-levels in VWARNING, namely, LEVEL 1 and LEVEL 2, which can be defined differently in

applications. For example, use LEVEL1 to indicate insufficient power while LEVEL 2 can be used to

indicate the oncoming shutdown.

The default values of VWARNING and VOFF can be respectively set in registers REG3AH、REG3BH and

REG31H[2:0].

Over-Voltage Protection

If the external power voltage exceeds 6.3V, AXP202 will release IRQ1/4 for indication. If the external

power voltage exceeds 7V, AXP202 will automatically shutdown the system.

9.3 Adaptive PWM Charger

AXP202 integrates a constant current/voltage PWM charger to automatically control the charge cycle,

with a built-in safety clock capable of automatic charge termination without processor intervention. This

charger features automatic charge current scaling in accordance with the system power consumption,

as well as battery detection, trickle charge and activation. In addition, the built-in temperature detection

circuit can automatically decrease the charge current when the temperature is too high or too low.

Compared with traditional linear charge, this PWM charger features dramatic efficiency increase and

power consumption decrease in systems that require large power consumption and fast battery

charging, and thus greatly improve the system temperature performance.

Adaptive Charge Startup

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