C8051F331-GMR

Overview

The C8051F331-GMR is a mixed-signal ISP Flash microcontroller 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 768 bytes of internal data RAM (256 + 512). The device operates within a supply voltage range of 2.7 V to 3.6 V and supports an industrial temperature range of –40 °C to +85 °C. It is housed in a 20-pin QFN package.

Feature Summary

• Integrated on-chip debug circuitry for full-speed, non-intrusive in-system debugging without external emulators.
• Features a pipelined instruction architecture that executes 70% of instructions in one or two system clocks.
• Includes hardware-enhanced serial ports supporting UART, SMBus, and SPI communication protocols.
• Provides 17 port I/O pins, all of which are 5 V tolerant with high sink current capability.

Applications

• In-system programming applications requiring direct code updates via the C2 interface.
• Embedded control systems utilizing the high-speed 8051 core for real-time processing.
• Industrial monitoring devices operating within the specified industrial temperature range.
• Low-power embedded designs leveraging idle and stop mode power management features.

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific GMR suffix indicates tape-and-reel packaging if required for automated assembly. Check for end-of-life status as this series may be discontinued. Ensure design compliance with RoHS directives and verify lead-free soldering compatibility for surface mount installation.

Selection Notes

Select this component when a fully static 8051 MCU with integrated analog peripherals is needed. Consider the 8 kB Flash size against application code requirements. Evaluate the 2.7 V to 3.6 V supply constraint against system power rails. Compare pin count and peripheral availability against other members of the C8051F33x family for optimal fit.

Part Context

This part belongs to the C8051F33x series of mixed-signal microcontrollers. It shares the same core architecture and peripheral set as siblings like the C8051F330 and C8051F332, differing primarily in memory configuration and specific analog feature inclusion. The series represents Silicon Labs' approach to high-integration single-chip solutions.

Replacement Considerations

Direct substitutes include other variants within the C8051F33x family such as the C8051F330 or C8051F332, provided memory sizes and peripheral requirements align. Verify pinout compatibility and software register mapping before substitution. Cross-reference with newer Silicon Labs 8-bit MCU families if long-term availability is a concern.