ELFR16111E is an RFID transponder IC developed by NXP Semiconductor. It is a low-power transponder IC designed for high-frequency (HF) 13.56 MHz RFID applications. The IC is capable of both transmitting and receiving data. The features of this IC include easy ask amplitude control, a variety of data frames, multiple pre-defined commands, various encryption algorithms, high-speed communication and collision-free operation. This IC is suitable for applications such as authentication, secure identification, e-payment, in-vehicle applications, secure access control and secure master-slave communication.