• Without external USB transceiver for USB port.
• Support USB1.1 and Microsoft Windows driver compatible
• Divide the USB_PWR (5V) by R419 and R420 to create EINT3 signal
( must over 0.8*2.8V= 2.24). 35uA leakage current. “Trade-off !”
• 3.3V LDO to provide VUSB power to BB USB block
• Short the USB_PWR and CHR pins in the USB cable !
Reason 1: Charging power on the handset when USB plugged in
Reason 2: BB can handle the USB charging function (Option)
【文件名】:111113@52RD_11818@52RD_联发科(MTK)手机平台电路原理详解.pdf
【格 式】:pdf
【大 小】:185K
【简 介】:
【目 录】: