C8051F818-GU

Overview

The C8051F818-GU is an obsolete mixed-signal ISP Flash microcontroller from Silicon Labs, part of the C8051F80x-83x family. It features a high-speed 8051 core operating at up to 25 MHz with pipelined architecture. The device integrates 8 KB of in-system programmable Flash memory and 512 bytes of internal data RAM. Key peripherals include a capacitance-to-digital converter for touch sensing, a 10-bit ADC, comparators, and standard digital interfaces such as UART, SMBus, and SPI. It operates on a supply voltage between 1.8 V and 3.6 V within an industrial temperature range.

Feature Summary

• Integrated capacitance-to-digital converter supporting buttons, sliders, wheels, and capacitive proximity sensing with auto-scan capabilities.
• High-speed 8051 microcontroller core executing 70% of instructions in one or two system clocks for efficient processing.
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators.
• Mixed-signal integration combining analog peripherals like a 10-bit ADC and comparators with digital serial communication ports.

Applications

• Capacitive touch interface implementations including buttons and sliders
• Industrial control systems requiring mixed-signal processing
• Portable instrumentation utilizing low-voltage operation

Procurement Notes

This component is officially marked as Not Recommended for New Designs and has reached end-of-life status. Verify current availability through authorized distributors, noting that stock may be limited or discontinued. Confirm package integrity and storage conditions prior to installation. Review the latest product change notices for any labeling updates or obsolescence announcements before initiating procurement processes.

Selection Notes

Select this component only for legacy system maintenance or specific retrofitting projects where the C8051F8xx pinout and feature set are mandatory. Evaluate alternative modern microcontrollers from Silicon Labs for new designs due to the official recommendation against using this family. Ensure development tools and compilers support the CIP-51 architecture and verify that the QSOP-24 package fits the existing PCB footprint constraints.

Part Context

The C8051F818-GU belongs to the C8051F80x-83x series of mixed-signal microcontrollers designed by Silicon Labs. This family emphasizes high integration by combining a fast 8051 core with extensive analog and digital peripherals on a single chip. The GUR suffix indicates a specific tape-and-reel packaging variant, while the base model defines the memory configuration and peripheral set shared across the series.

Replacement Considerations

No public confirmed substitute part numbers are available for direct replacement. Consult Silicon Labs documentation for recommended modern alternatives suitable for new designs.