C8051F331R
C8051F331R - 25MHz Mixed-Signal 8-Bit MCU | Silicon Labs (Tape & Reel)
The Silicon Labs C8051F331R is a mixed-signal 8-bit microcontroller with a 25 MHz 8051 core, 8 KB of Flash memory, 768 bytes of RAM, and a 20-pin QFN package measuring 4 mm by 4 mm. It integrates a 12-bit ADC, a 12-bit DAC, one comparator, four 16-bit timers, and I2C, SPI, and UART communication interfaces. Its mixed-signal architecture combines an embedded 8-bit MCU with on-chip analog peripherals, making it suitable for compact control systems that require sensing, actuation, and serial communications in one device.
An 8051-compatible MCU is an embedded microcontroller whose instruction set and register organization are based on the Intel 8051 architecture. Within the product hierarchy, the C8051F331R belongs to the mixed-signal microcontroller family, combining digital control, Flash program memory, RAM, timers, serial interfaces, and analog conversion functions. This integration reduces the number of external components required in sensor-control, data-acquisition, and compact embedded-control designs.
The C8051F331R operates at up to 25 MHz and provides 25 MIPS of processing performance. Its 8 KB Flash memory supports an 8K by 8-bit program-memory organization, while 768 bytes of RAM accommodate working data and stack operations. Four 16-bit timers support periodic events, timing measurements, and communication baud-rate generation. The integrated I2C, SPI, and UART interfaces enable the controller to connect to sensors, converters, displays, and external processors through several common serial protocols.
The on-chip analog resources include an ADC, a DAC, and one comparator. These peripherals allow a design to acquire real-world inputs and produce an analog output without requiring separate converters. On-chip Power-On Reset, VDD monitoring, and watchdog functions support reliable startup and supervision. The manufacturer describes the C8051F331R as an ISP Flash MCU, supporting in-system programming for programming and updating the embedded firmware.
Typical uses include industrial sensor nodes, compact data-acquisition modules, motor and actuator controllers, temperature-measurement equipment, and communication-enabled embedded systems. Its small QFN-20 footprint supports compact assemblies, although the exposed-pad construction requires deliberate PCB layout and thermal management. Engineers should also account for the limited 8 KB program memory when sizing firmware and application protocols.
For a new PCB, use the manufacturer datasheet to confirm the exact exposed-pad dimensions, decoupling requirements, programming signals, and pin assignments. For an existing QFN-20 design, do not assume that another C8051F33x member is interchangeable; compare memory, analog peripherals, timers, I/O availability, and package details before substituting a device. Verified distributor pricing and a manufacturer product page are summarized below for engineering selection and procurement planning.
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