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AXP209 Datasheet(PDF) 20 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]

AXP209 Datasheet(HTML) 20 Page - List of Unclassifed Manufacturers

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Enhanced single Cell Li-Battery and Power System Management IC
VTRGT = charge target voltage. The VTRGT is 4.2V by default, which can be set via a register (Refer to
“REG33H[6:5]”) . At the same time, AXP209 will automatically adjust the charge target voltage when
external power voltage is low.
VRCH = automatic recharge voltage. VRCH=VTRGT-0.1V
Charging current
The charge current is 500mAor 1200mA by default, which can be set by REG33H [3:0].
Charging Process
If the battery voltage is lower than 3.0V, the charger will automatically enter the pre-charge mode, with
charge current being 1/10 of the preset value. If the battery voltage is still below 3.0V 40 minutes later
(adjustable, see “REG34H”), the charger will automatically enter the battery activate mode. Refer to
“Battery Activate Mode” section for details.
Once the battery voltage exceeds 3.0V, the charger enters constant current mode. If the charge current
is below 65% of the preset value, the system will send IRQ17 to indicate that “drive ability of external
power is insufficient”, as a result, the charge current is lower than the preset value, which may lead to
longer charge time, so stronger power is preferred, or power-consuming functions should be disabled to
shorten the charge time.
When the battery voltage reaches the VTRGT, the charger will switch from the constant current mode to
constant voltage mode, and the charge current will taper off.
When the charge current is lower than 10% or 15% (adjustable, see register “REG33H”) of the preset
value, a charge cycle ends, and AXP202 will release IRQ18 while the CHGLED pin will stop indicating
the charging state. When the battery voltage is below VRCH again, the automatic charge will restart, and
IRQ17 will be issued.
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