C8051F803-GSR

Overview

The C8051F803-GSR is a mixed-signal ISP Flash MCU from Silicon Labs, featuring a high-speed 8051 core with up to 25 MIPS throughput at 25 MHz. It integrates 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 Capacitance-to-Digital Converter with 16-bit resolution, and multiple digital interfaces such as UART, SMBus, and SPI. The device operates on a supply voltage of 1.8 to 3.6 V and supports packages including 24-pin QSOP, 20-pin QFN, and 16-pin SOIC.

Feature Summary

• Integrated Capacitance-to-Digital Converter supporting buttons, sliders, wheels, and capacitive proximity sensing with auto-scan capabilities.
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators.
• Pipelined instruction architecture executing 70% of instructions in one or two system clocks for enhanced performance.
• Hardware-enhanced serial ports including UART, SMBus, and SPI for robust digital communication.

Applications

• Capacitive touch sensing applications
• Portable battery-powered devices
• Industrial control systems

Procurement Notes

Verify the component status before procurement, as this specific model family is designated Not Recommended for New Designs (NRND). Confirm that existing inventory meets project requirements and plan for potential obsolescence. Ensure the ordering suffix matches the required package type and temperature range specifications.

Selection Notes

Select this component for legacy designs requiring mixed-signal integration within a compact footprint. Evaluate the trade-off between the integrated capacitance sensing features and the NRND status. Consider alternative modern microcontrollers if new development is initiated, ensuring compatibility with existing software architectures based on the CIP-51 core.

Part Context

This part belongs to the C8051F80x-83x family of mixed-signal ISPs Flash MCUs. These devices are designed for cost-sensitive applications requiring analog and digital peripherals on a single chip. The family shares a common architectural foundation but varies in memory size and peripheral availability across different model numbers.

Replacement Considerations

Public confirmed substitute part numbers: None available.

FAQ

What is the maximum sampling rate of the onboard ADC?

The onboard 10-bit ADC supports a maximum sampling rate of up to 500 ksps.

Does the C8051F803-GSR support capacitive sensing?

Yes, it includes a Capacitance-to-Digital Converter capable of supporting buttons, sliders, wheels, and capacitive proximity sensing.