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USB based battery charger

Other Parts Discussed in Thread: BQ24250

Hi, 

I like to design a battery charger that would charge a single cell Li-ion battery that is capable of:

- Supplying 1A when connected to wall adapter (BCD1.2 capable?. Preferably do this selection without software involvement)

- When uC is off, still continues to charge but perhaps using 500mA (Auto enumerate? or bypass enumeration requirement and charge with 500mA anyway without software involvement)

- Power Path capable (supplement from battery when necessary)

- i2C interface for communication, but should work without uC on. 

Is this possible with currently available TI chargers?