An electrical study of USB2.0 channels supporting multiplexers/BC1.2 power switches/charging modules

Abstract

An electrical study on USB2.0 channels supporting multiplexers, BC1.2 power switches and charging modules is presented in this paper. The issues caused by the inclusion of the aforementioned devices in a USB2.0 channel are tackled in the key learnings of this paper. The proposed methods focus on channel design on existing and new signaling. Of note, they maintain design flexibility, while maintaining healthy compliance eye margins. The methods primarily mitigate harmful signal degradation through correct device placement in the channel, tradeoff between device loss and length in mainstream, tablet and phone solutions. Ultimately, this translates into a shift in line with recent platforms' move to extend the usage of the USB2.0 interface into a wider number of applications.