ft6188 Fangtek's ft6188 is a SIM card control device designed for dual SIM card enabled mobile phones. The ft6188 supports both 1.8V and 3.3V SIM cards with integrated LDOs and level shifters. A Serial Port Interface (SPI) is used to configure and control the both cards. The ft6188 works as a SIM card switch to bring card to operation in turns at specified interval. The device adopts a break-before-make switching scheme, i.e., to break the connection with a card before getting connected with the other so as to avoid possible communication collision. The ft6188 features the internal LDO and level shifter to support both 1.8V and 3.3V cards and thus provides a universal SIM card interface. The ft6188 SPI control interface is designed to communicate with microprocessors or controllers, such as cell phone baseband chip. The three-line interface provides easy access with the universal data communication standards, as well as saves the GPIO communication pins which are precious resource on microprocessors. The ft6188 is available in 3mm x 3mm QFN20 package, 0.4mm pitch. Applications ·Dual SIM card mobile phone ·Smartphone        Product Brief       DataSheet        Application Note