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Setting of the identification resistor on the USB side of the Apple charger

Source: Internet
Author: User
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Apple defines 3 charging currents for the charger, which are 0.5a/1a/2.1a. This is achieved by a combination of 3 different resistors. When an Apple device ipad,iphone,ipod the USB port charger, it detects the voltage on the USB d+ and D-to determine the output current of the charger, and then combines its own required current to determine the specific input current.

0.5A Charger USB Port Settings


1 A charger USB port settings


2.1A Charger USB Port Settings

2.4A Charger USB Port Settings

Setting of the identification resistor on the USB side of the Apple charger

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