C8051F820-GU

Overview

The C8051F820-GU is a mixed-signal ISP Flash microcontroller from the C8051F80x-83x family, manufactured by Silicon Labs. It features a high-speed 8051 core operating at up to 25 MHz with pipelined architecture delivering 25 MIPS throughput. The device includes 8 kB of in-system programmable Flash memory and 512 bytes of internal data RAM. Key peripherals include a capacitance-to-digital converter supporting capacitive sensing, a 10-bit ADC with up to 500 ksps conversion rate, and a comparator. Digital interfaces consist of an enhanced UART, SMBus (I2C compatible), and SPI. The unit operates on a supply voltage of 1.8 V to 3.6 V and is housed in a 24-pin QSOP package.

Feature Summary

• Integrated capacitance-to-digital converter for buttons, sliders, wheels, and proximity sensing with auto-scan capabilities
• High-speed 8051 core with pipelined instruction architecture executing most instructions in one or two system clocks
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators
• Mixed-signal analog peripherals including a 10-bit ADC and programmable comparator with configurable hysteresis

Applications

• Capacitive touch sensing applications such as buttons, sliders, and wheels
• Data acquisition systems utilizing the integrated 10-bit ADC
• Embedded control logic requiring mixed-signal processing and serial communication
• Low-voltage portable devices powered by 1.8 V to 3.6 V supplies

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required package type and temperature range. Check current lifecycle status as this family may be marked Not Recommended for New Designs. Ensure compatibility with existing development tools and verify pinout alignment for QSOP-24 footprint integration.

Selection Notes

Select this component when a mixed-signal MCU with integrated capacitive sensing is required. The C8051F820-GU provides sufficient Flash and RAM for moderate complexity firmware while offering extensive analog peripherals. Consider the 24-pin QSOP package for through-hole assembly requirements. Evaluate power consumption profiles against application needs given the 1.8 V to 3.6 V operating range.

Part Context

This part belongs to the C8051F80x-83x family of mixed-signal ISPs Flash MCUs. The series is characterized by high integration, combining a fast 8051 core with rich analog and digital peripherals on a single chip. The family supports various packages including QFN, SOIC, and QSOP, catering to different board space and assembly constraints.

Replacement Considerations

Consult the official datasheet for cross-reference information. Verify functional equivalence regarding pinout, memory size, and peripheral availability before substitution.