The C8051F863-C-IS is a System-On-Chip (SoC) solution from Silicon Labs that integrates an 8051 microcontroller core with various on-chip peripherals and memory, including a USB 2.0 Full Speed Device Controller. The part is offered in a 4mm x 4mm QFN package with four KB of mask ROM, two KB of RAM, and 5KB of OTP (One-Time Programmable) memory. On-chip peripherals include an Analog-to-Digital Converter (ADC), two CAN-bus interfaces, I2C and SPI, two UARTs with baud rate up to 3.3 Mbps, a PWM, and a real-time clock with an integrated calendar. The device operates from an external power supply of 2.4 - 5.5V DC, drawing up to 200 µA when in sleep mode.