The Texas Instruments TPS2540 and TPS2541 USB port power switch and controller are a combination of current-limited USB port power switch with a USB 2.0 high-speed data line (D+/D-) switch and a USB charging port identification circuit. Applications include notebook PCs and other intelligent USB host devices. The wide bandwidth (2.6 GHz) data-line switch also features low capacitance and low on resistance, allowing signals to pass with minimum edge and phase distortion. The TI TPS2540 / TPS2541 USB port power switch and controller monitors D+ and D-, providing the correct hand-shaking protocol with compliant client devices. The TI TPS2540 and TPS2541 switch and controller meet Battery Charging Specification BC1.2 (draft) for DCP and CDP and Chinese Telecommunications Industry Standard YD/T 1591-2009.