C8051F557-IMR

Overview

The C8051F557-IMR is an 8-bit mixed-signal microcontroller from Silicon Labs, part of the C8051F55x family. It features a high-speed CIP-51 core operating at up to 50 MHz with 50 MIPS throughput. The device includes 16 kB of in-system programmable Flash memory and 2304 bytes of internal data RAM (256 + 2048 XRAM). Key analog peripherals consist of a 12-bit ADC supporting up to 200 ksps and two comparators. Digital interfaces include CAN 2.0, LIN 2.1, UART, SMBus, and SPI. It operates on a supply voltage of 1.8 V to 5.25 V and is housed in a 24-pin QFN package.

Feature Summary

• Integrated CAN 2.0 and LIN 2.1 controllers that operate without requiring external crystals
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without separate emulator hardware
• High-speed pipelined CIP-51 architecture executing 70% of instructions in one or two system clocks
• Programmable 12-bit ADC with selectable gain and built-in temperature sensor capabilities

Applications

• Automotive embedded systems requiring AEC-Q100 qualification
• Industrial control applications utilizing CAN and LIN bus communication
• Mixed-signal data acquisition systems employing high-resolution ADCs
• Low-power battery-operated devices leveraging stop mode current characteristics

Procurement Notes

Verify component authenticity through authorized Silicon Labs distributors or certified partners. Confirm the specific revision level matches project requirements, as datasheet revisions may update electrical characteristics. Ensure the ordering suffix corresponds to the correct tape-and-reel packaging configuration for automated assembly processes. Cross-reference the part number against official obsolescence notices to confirm availability status.

Selection Notes

Select this component when a robust 8051-compatible architecture is required alongside integrated automotive-grade serial protocols. The absence of external crystal requirements for CAN and LIN simplifies board layout and reduces bill of materials cost. Evaluate the 16 kB Flash capacity against application firmware size constraints. Consider the 24-pin QFN footprint limitations regarding available I/O pins for complex peripheral integration.

Part Context

This microcontroller belongs to the C8051F55x/56x/57x family of mixed-signal ISPs. These devices are designed for applications demanding high performance and low power consumption within a compact form factor. The family shares common architectural features including the CIP-51 core and extensive analog peripherals, differentiated primarily by memory sizes and pin counts across the series variants.

Replacement Considerations

Consult official Silicon Labs documentation for verified substitute part numbers within the same family or next-generation equivalents. Verify pin compatibility and software register mapping before implementing any cross-model replacements to ensure functional continuity.