C8051F809-GS

Overview

The C8051F809-GS is a mixed-signal ISP Flash MCU from the C8051F80x-83x family, featuring a high-speed 8051 core with up to 25 MIPS throughput at a 25 MHz clock. It includes up to 16 kB of in-system programmable Flash and up to 512 bytes of internal data RAM. Key peripherals include a 10-bit ADC supporting up to 500 ksps, a capacitive sense module with 16-bit resolution, and an on-chip debug circuitry for non-intrusive in-system debugging. The device operates within a supply voltage range of 1.8 to 3.6 V and supports temperature ranges from –40 to +85 °C.

Feature Summary

• Integrated capacitive sense module supporting buttons, sliders, wheels, and proximity sensing with auto-scan capabilities.
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators.
• High-speed pipelined 8051 core executing 70% of instructions in one or two system clocks.
• In-system programmable Flash memory allowing field upgrades and non-volatile data storage.

Applications

• Capacitive touch interface designs requiring button, slider, or wheel inputs.
• Battery-powered systems utilizing low-power management modes.
• Embedded control applications needing analog signal acquisition via the 10-bit ADC.
• Prototyping and development environments leveraging on-chip debug features.

Procurement Notes

Verify component authenticity through authorized Silicon Labs distributors. Confirm package type matches design requirements, as the family supports QSOP-24, QFN-20, and SOIC-16 options. Check for 'Not Recommended for New Designs' status in current documentation before finalizing procurement plans.

Selection Notes

Select this part for applications requiring integrated capacitive sensing alongside standard microcontroller functions. Ensure the 1.8V to 3.6V supply range aligns with system power rails. Consider the limited I/O count and memory size relative to application complexity. Evaluate if the discontinued status impacts long-term production viability compared to newer Silicon Labs alternatives.

Part Context

The C8051F809-GS belongs to the C8051F80x-83x series of mixed-signal MCUs. This family emphasizes high integration by combining digital peripherals, analog interfaces, and capacitive sensing on a single chip. It utilizes the CIP-51 architecture for efficient code execution while providing extensive connectivity options including UART, SPI, and SMBus.

Replacement Considerations

Silicon Labs indicates this family is not recommended for new designs. Consult official documentation for specific cross-reference recommendations or next-generation equivalents suitable for replacing legacy C8051F8xx devices in existing hardware architectures.