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AXP209 Datasheet(PDF) 19 Page - List of Unclassifed Manufacturers

Part No. AXP209
Description  Enhanced single Cell Li-Battery and Power System Management IC
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Maker  ETC2 [List of Unclassifed Manufacturers]
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AXP209 Datasheet(HTML) 19 Page - List of Unclassifed Manufacturers

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AXP209
Enhanced single Cell Li-Battery and Power System Management IC
High
1
VBUS
Select if VBUS is valid
High
0
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:
Confidential
Page 19/45


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