The STC11F20XE-35I-PDIP40 is a DIP40 RoHS-compliant microcontroller with 8-bit processing capability manufactured by STC. It has an internal clock frequency of up to 35MHz, and is part of the STC11F2xxE series of controllers. It also has integrated features such as UART, 16-bit Timer/Counter, 1-Wire Host Interface, 8/16-bit High Speed PWM, SPI interface, SPI/I2C interface, Low Power Management, Watchdog Timer and more. The microcontroller has a total of 32KBytes on- chip Flash memory and 6KBytes of XRAM. It is able to operate from a wide supply voltage range of 2.7 to 3.6V, and has a temperature range of -40C to +85C.