C8051F581-IMR

Overview

The C8051F581-IMR is an 8-bit mixed-signal microcontroller from the C8051F58x family, featuring a high-speed 8051 core operating at up to 50 MHz. It integrates 128 kB of in-system programmable Flash memory and 8448 bytes of internal data RAM. The device includes a 12-bit ADC with up to 32 external single-ended inputs, three comparators, and a built-in temperature sensor. Communication interfaces include CAN 2.0, LIN 2.1, two UARTs, SMBus, and SPI. It operates on a supply voltage of 1.8 V to 5.25 V and is housed in a 48-pin QFN package.

Feature Summary

• Integrated CAN 2.0 and LIN 2.1 controllers that operate without requiring an external crystal.
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without separate emulator hardware.
• High-speed pipelined 8051 core architecture capable of executing 70% of instructions in one or two system clocks.
• Flexible clock source selection allowing on-the-fly switching between internal oscillators and external sources.

Applications

• Industrial control systems utilizing LIN bus communication
• Automotive embedded applications requiring CAN connectivity
• Mixed-signal data acquisition systems with analog input requirements

Procurement Notes

Verify component authenticity through authorized Silicon Labs distributors or certified partners. Confirm the specific suffix matches the required package and temperature grade. Check for current availability status as this series may be subject to lifecycle changes. Ensure compatibility with existing design tools and development kits before finalizing procurement orders.

Selection Notes

Select this model when a robust 8051 architecture with integrated automotive-grade serial protocols is required. Consider the 128 kB Flash capacity for complex firmware implementations. Evaluate the 48-pin QFN package constraints against board space limitations. Verify that the 1.8 V to 5.25 V supply range aligns with the target system power design.

Part Context

This component belongs to the C8051F58x/F59x mixed-signal ISP Flash MCU family by Silicon Laboratories. The family is characterized by its comprehensive analog peripherals and digital communication interfaces within a single chip. It represents a mature line of 8-bit microcontrollers designed for cost-sensitive yet feature-rich embedded applications.

Replacement Considerations

Consult official Silicon Labs documentation for confirmed substitute part numbers within the same family or next-generation equivalents. Verify pin-to-pin compatibility and peripheral mapping before transitioning designs to alternative components.