AXP209 datasheet(19/45 Pages) ETC2

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AXP209

Enhanced single Cell Li-Battery and Power System Management IC

High

VBUS

Select if VBUS is valid

High

ACIN / BAT Don’t select VBUS

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

The value of VWARNING (low-power warning voltage) and VOFF(automatic shutdown voltage)

can be configured. 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, AXP209 will send IRQ1/4 for indication. If the external

power voltage exceeds 7V, AXP209 will automatically shutdown the system.

9.3 Adaptive PWM Charger

The AXP209 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 host 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 chargers, 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 Charging Startup

The default state of the charger is “Enabled”. (It can be programmed via registers. Refer to register

REG33H.) When external power is plugged in, AXP209 will firstly judge whether it is suitable. If the

charger is suitable for the power, and the charge function is allowed, AXP209 will automatically start the

charge, and send IRQ to Host. At the same time, GHGLED pin will output low level to drive external

LED to indicate the charging state.

Charging voltage and current:

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