OB38S003W20EP is an Other Processors and Microcontrollers (MCUs) TSSOP-20 RoHS manufactured by On-Bright. This device is an 8-bit enhanced core microcontroller that includes the powerful 80C51 Central Processing Unit (CPU), 256 bytes of on-chip RAM, 4K bytes of on-chip EEPROM, a programmable serial channel for standard UARTs and an enhanced I²C interface. It also comes with 16 individual I/O ports and 8/16/32-bit timers. The device also offers integrated oscillator circuitry and a precision Internal RC Oscillator to provide a reliable, low cost solution for today's designs. Additionally, an internal voltage regulator provides a wide operating voltage of 2.4V to 5.5V.