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BQ24257 Fast charge DCP and USB link

Clement Michaud
Prodigy 10 points
Other Parts Discussed in Thread: BQ24257, BQ24297

Hello,

In order to fast charge (2A) my product i'm using a BQ24257 regulator. 

USB linked from connector to MCU (mass storage SD card function) and BQ24257 throw a protection.

Ii'm using IPAD or Samsung 220V adapter (max current 2.1A). When I place an impedance (180 Ohms) between D+ to D-, the charge current as expected reach 2A other wise only 500mA. But with the 180 Ohms resistor the product is not recognized as mass storage by the computer.

So, how can i use the USB link and the fast charge mode alternatively ?

Can you give me reference of 220V adapter compatible with DCP detection of BQ24257 ?

 Thanks for your advice