C8051F351-GM

Overview

The C8051F351-GM is a mixed-signal 8-bit microcontroller from Silicon Labs, featuring a high-speed 8051 core operating at up to 50 MHz. It integrates 8 kB of in-system programmable Flash memory and 768 bytes of RAM. Key analog peripherals include a 24-bit ADC with an 8-channel multiplexer and programmable gain amplifier, two 8-bit current-output DACs, and a voltage comparator. The device provides 17 digital I/O pins, all 5 V tolerant, along with enhanced UART, SMBus, and SPI interfaces. It operates within a supply voltage range of 2.7 V to 3.6 V and supports temperatures from -40 °C to +85 °C.

Feature Summary

• High-performance pipelined 8051 core delivering up to 50 MIPS throughput with most instructions executing in one or two system clocks.
• Integrated 24-bit sigma-delta ADC subsystem supporting up to eight input channels with programmable gain stages up to 128 times.
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without requiring external emulation hardware.
• Flexible digital peripheral set including four 16-bit timers, a programmable counter array, and multiple serial communication ports.

Applications

• Portable medical equipment
• Weigh scales
• Test equipment
• Fiber optic systems

Procurement Notes

Verify the component status before procurement as the C8051F351 family is designated Not Recommended for New Designs. Confirm package availability and lead times directly with authorized distributors or the manufacturer. Ensure that existing inventory meets project requirements given the potential end-of-life constraints associated with this specific MCU series.

Selection Notes

Select the C8051F351-GM when high-resolution analog acquisition is required alongside standard digital control functions. The integrated 24-bit ADC and programmable gain amplifier make it suitable for precision sensor interfacing. Consider the 5 V tolerant I/O for direct interface with legacy logic levels. Evaluate alternative members of the C8051F35x family if different memory sizes or pin counts are needed.

Part Context

This component belongs to the C8051F35x series of analog-intensive microcontrollers from Silicon Labs. The series shares a common architecture based on the CIP-51 core but varies in memory size and peripheral configurations. The C8051F351 specifically targets applications demanding high analog performance within a compact QFN-28 package footprint.

Replacement Considerations

Public confirmed substitute part numbers: None available.