C8051F312

Overview

The C8051F312 is an 8-bit microcontroller from the Silicon Labs C8051F31x family, featuring a high-speed pipelined 8051 core with up to 25 MIPS throughput at 25 MHz. It integrates 8 kB of in-system programmable Flash memory and 1280 bytes of internal data RAM. The device includes four general-purpose 16-bit timers, a 16-bit Programmable Counter Array (PCA), hardware-enhanced UART, SMBus, and SPI interfaces. It operates on a supply voltage of 2.7 V to 3.6 V within a temperature range of –40 °C to +85 °C.

Feature Summary

• High-performance 8051 core executing most instructions in one or two system clocks
• Integrated analog peripherals including comparators with programmable hysteresis
• Flexible digital I/O with 5 V tolerance and programmable crossbar routing
• On-chip debug circuitry supporting non-intrusive in-system debugging

Applications

• Industrial control systems requiring robust 8-bit processing
• Sensor monitoring applications utilizing onboard comparators and timers
• Embedded devices needing serial communication via UART, SMBus, or SPI
• Cost-sensitive embedded solutions using 28-pin QFN packaging

Procurement Notes

Verify the specific package variant, as the C8051F312 utilizes a 28-pin QFN form factor distinct from other family members. Confirm that the 8 kB Flash configuration meets application requirements, as this model differs from the 16 kB variants in the same series. Ensure compatibility with the 2.7 V to 3.6 V operating voltage range for the target design environment.

Selection Notes

Select the C8051F312 when 8 kB of program memory is sufficient, offering a cost-effective alternative to the 16 kB models. This part is suitable for designs prioritizing the 28-pin QFN footprint over the LQFP options available in the series. It provides essential mixed-signal capabilities without the ADC found in higher-end variants, focusing on digital control and timing functions.

Part Context

The C8051F312 belongs to the C8051F31x family of fully integrated mixed-signal System-on-Chip microcontrollers. It shares the same CIP-51 core and peripheral set as siblings like the C8051F310 and C8051F311, differing primarily in Flash capacity and package type. This positioning allows designers to scale memory resources while maintaining pin and code compatibility across the series.

Replacement Considerations

Direct substitutes include other C8051F31x variants such as the C8051F311 or C8051F313, which share the 28-pin QFN package. Note that these alternatives may offer different Flash sizes (16 kB) or lack specific analog features like the ADC present in some peers. Verify pinout compatibility and software migration efforts before swapping.