1. Introduction CX2901 CX1901 is a USB charging port control protocol IC, can automatically identify the type of charging equipment, and the corresponding USB charging via a handshake agreement with the device to obtain the maximum charging current, charging time savings while protecting the charging device. Applications: mobile power, portable charger, car charger. 2. Features Operating voltage:? 4.5V ~ 5.5V dual-port control function ():? Can simultaneously support two independent detection protocol supports multiple USB charging USB charging protocol, each charging protocol is automatically switched, including:?? Divider1 / Divider2 / Divider3 charging protocol (Apple Special)? D + / D- set 1.2V mode (Samsung-specific)? BC1.2 DCP and CTIS YD / T 1591-2009 charging protocol? reliable power-on reset (POR) and low-voltage reset (LVR ) Performance Package:? SOT23-5, SOT23-6