iPhone 3G 충전 회로

To charge an iPhone 3G, usb data- (25) should be at 2v, usb data+(27) should be at 2.8v. This can be done with a few simple resistors: 33k to +5v (23) and 22k to gnd(16) to obtain 2v and 33k to +5v and 47k to gnd to obtain 2.8v. This is a "notification" to the iphone that it is connected to the external charger and may drain amps from the usb.

Measured from original Apple USB plug = D- = 2.8V, D+ = 2.0V

http://techblog.tistory.com/entry/iPhoneCharging

http://tzywen.com/modules.php?name=News&file=article&sid=696

http://www.mobiletechaddicts.com/2008/10/11/solution-to-iphone-3g-charging-problems

http://www.scosche.com/products/productID/1667

http://home.swipnet.se/ridax/connector.htm?connipod.htm

http://www.cablejive.com/iphone_3g_charge_converter.html


Apple iPod and iPhone dock interfaces pinout

http://forums.xbox-scene.com/index.php?showtopic=654633

http://pinouts.ru/PortableDevices/ipod_pinout.shtml

http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2007/awr8_asl45/awr8_asl45/index.html

http://www.sparkfun.com/commerce/product_info.php?products_id=633#

http://home.swipnet.se/ridax/connector.htm


적용 사례

http://clien.career.co.kr/zboard/view.php?id=use&no=9850

http://clien.career.co.kr/zboard/view.php?id=lecture&no=4475

http://techblog.tistory.com/entry/chargerdiy

http://cafe.naver.com/appletouch/138128