The HOLTEK HT66F302 is a SOP-10_150mil RoHS-compliant, low-voltage, microcontroller-based integrated circuit that is manufactured by Holtek. It is based on 8051 core architecture, and has an enhanced MCS-51 compatible instruction set with 8/16/32bit data types to provide high flexibility. Furthermore, it includes a 16-bit interrupts and provides up to 64K bytes of Flash memory to allow programming of up to 64K bytes of user program and 8K bytes of RAM to enable extended software development. The HT66F302 also features multiple internal peripherals such as an 8-bit ADC/DAC, 10-bit timer/counter, UART, I2C, SPI, WDT, and several I/Os that enable several sensor monitoring and communications capabilities. It has power-saving modes and operates over a wide voltage range.