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AXP209 Datasheet(PDF) 15 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) 15 Page - List of Unclassifed Manufacturers

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AXP209
Enhanced single Cell Li-Battery and Power System Management IC
9. Control and Operation
When AXP209 powers on and TWS interface SCK / SDA pins are pulled to host IO voltage source, the host
can then adjust and monitor the AXP209. This provides f
lexible adjustment and monitoring options, and a
wealth of information.
Note: "Host" Referring to the main application processor
Note: "External power supply" refers to ACIN And VBUS Inputs.
9.1 Power On / Off & Reset
Button(PEK)
AXP209 PWRON Pin can be connected to GND through a button, as a Power Enable Key (PEK) o
r
hibernation/wake button. The AXP209 can automatically identify long and short button presses and
react accordingly.
Power on Sources:
1. ACIN, VBUS, and battery
2. N_OE transition from high to low.
3. PEK press
Power On
System power-on is initiated whenever the following conditions occur:
1. When N_OE is low, and upon connection of a power supply that meets the requirements
(ACIN Or VBUS > 3.8V, and the battery voltage is higher than the shutdown voltage), AXP209
will automatically boot (Automatic booting on power supply connection can be configured by
the developer).
2. N_OE is low and the system is powered off, press PEK can power on AXP209. If required the
Host
3. When there is a valid external power source or battery present and N_OE changes from high to
low, AXP209 will be turned on.
After power on, DC-DC and LDO will be soft booted in a preset timing sequence, and then either the
Host or PWREN the pin can enable/disable power.
Shutdown (Power off)
When you push-and-hold PEK longer than IRQLEVEL, HOST can write “1” into“REG32H [7]” to inform
AXP202 to shutdown, which can disable all power output except LDO1.
System power-off is initiated whenever the following conditions occur:
1. Input voltage is too low( Low-Power Protection)
2. Power output voltage is too low due to overload( Overload Protection)
Confidential
Page 15/45


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