C8051F820-GUR

Overview

The C8051F820-GUR is an 8-bit mixed-signal ISP Flash MCU from Silicon Labs, featuring a high-speed 8051 core with up to 25 MIPS throughput at a 25 MHz clock. It integrates 8 kB of in-system programmable Flash memory and 512 bytes of internal data RAM. Key peripherals include a 10-bit ADC supporting up to 500 ksps, a Capacitance to Digital Converter for capacitive sensing, and hardware-enhanced UART, SMBus, and SPI interfaces. The device operates on a supply voltage of 1.8 V to 3.6 V and is housed in a 24-pin QSOP package.

Feature Summary

• Integrates a Capacitance to Digital Converter supporting buttons, sliders, wheels, and proximity sensing with auto-scan capabilities.
• Features a pipelined instruction architecture that executes the majority of instructions in one or two system clocks for high throughput.
• Includes on-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators.
• Provides hardware-enhanced serial communication ports including UART, SMBus, and SPI for reliable data transfer.

Applications

• Capacitive touch interface designs requiring button, slider, or wheel detection
• Low-voltage embedded control systems operating between 1.8 V and 3.6 V
• Data acquisition applications utilizing the high-speed 10-bit ADC
• Industrial monitoring devices leveraging the built-in temperature sensor

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix matches the required package and temperature range. Check current lifecycle status as this family may be marked Not Recommended for New Designs. Ensure ESD handling protocols are followed during assembly due to moisture sensitivity classification.

Selection Notes

Select this model when capacitive sensing functionality is required alongside standard mixed-signal processing. The 24-pin QSOP package suits designs needing moderate I/O density with through-hole or specific surface-mount constraints. Evaluate the 512-byte RAM limit against application stack requirements. Consider the 1.8 V minimum supply voltage for battery-powered implementations.

Part Context

This component belongs to the C8051F80x-83x family of mixed-signal MCUs. These devices share a common CIP-51 core architecture and peripheral set, differing primarily in memory sizes and pin counts. The family emphasizes integration by combining analog converters, digital interfaces, and capacitive sensing on a single chip.

Replacement Considerations

Consult the official product selection guide for equivalent models within the C8051F80x-83x series. Verify pin compatibility and memory specifications before substituting. Note that newer designs should evaluate currently recommended alternatives due to the legacy status of this family.