C8051F809-GSR

Overview

The C8051F809-GSR is a mixed-signal ISP Flash MCU from the Silicon Labs 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 512 bytes of internal data RAM. Key peripherals comprise a 10-bit ADC supporting up to 500 ksps, a capacitive sense module with 16-bit resolution, and multiple digital interfaces including UART, SMBus, and SPI. The device operates on a supply voltage of 1.8 to 3.6 V and supports packages such as 24-pin QSOP, 20-pin QFN, and 16-pin SOIC.

Feature Summary

• Integrated capacitive sense controller supporting buttons, sliders, 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 microcontroller core executing most instructions in one or two system clocks
• Versatile analog peripherals including a 10-bit ADC and programmable comparator with configurable hysteresis

Applications

• Capacitive touch interface implementations for user input controls
• Battery-powered embedded systems requiring low-voltage operation
• Industrial control applications utilizing in-system programming capabilities
• Sensor interfacing solutions leveraging integrated temperature sensors and ADCs

Procurement Notes

Verify component authenticity through authorized Silicon Labs distributors. Confirm package type matches design requirements, as variants exist in QSOP, QFN, and SOIC formats. Check revision status, as this family is marked Not Recommended for New Designs. Ensure environmental ratings align with application needs, specifically the –40 to +85 °C operating range. Validate pinout compatibility during PCB layout finalization.

Selection Notes

Select this model when existing designs utilize the C8051F80x series and require maintenance rather than new development. Evaluate if the 25 MHz maximum clock speed meets processing demands. Consider the limited Flash capacity relative to modern standards. Assess whether the specific peripheral mix, particularly the capacitive sense module, justifies continued use over newer alternatives. Verify long-term availability constraints due to the retirement status.

Part Context

This component belongs to the C8051F80x-83x mixed-signal MCU family, which integrates an 8051-compatible core with extensive analog and digital peripherals on a single chip. The family emphasizes cost-effective development through in-system programming and on-chip debug features. While widely deployed in previous generations of embedded products, the entire family has been designated as Not Recommended for New Designs by Silicon Labs, indicating end-of-life planning for future projects.

Replacement Considerations

Public datasheets do not list direct substitute part numbers for the C8051F809-GSR. Engineers should consult Silicon Labs documentation for current portfolio recommendations to replace retired components. Migration strategies typically involve evaluating newer C8051 or EFM32 families based on pin compatibility and peripheral requirements.