C8051F557-IM

Overview

The C8051F557-IM is an 8-bit mixed-signal ISP Flash MCU from Silicon Labs, featuring a high-speed CIP-51 core with up to 50 MIPS throughput at a 50 MHz clock. It integrates 16 kB of in-system programmable Flash memory and 2304 bytes of internal data RAM (256 + 2048 XRAM). The device includes a 12-bit ADC supporting up to 200 ksps, two comparators, and various digital peripherals such as 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

• High-performance CIP-51 microcontroller core executing 70% of instructions in one or two system clocks for efficient processing.
• Integrated analog subsystem including a 12-bit ADC with selectable gain and built-in temperature sensor alongside dual comparators.
• Comprehensive digital communication interfaces including hardware-enhanced UART, SMBus, SPI, and dedicated CAN/LIN controllers without external crystals.
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without requiring external emulation hardware.

Applications

• Automotive embedded systems requiring AEC-Q100 qualification
• Industrial control units utilizing CAN and LIN bus protocols
• Smart sensors and instrumentation with integrated signal conditioning

Procurement Notes

Verify the component status carefully before procurement, as this specific part number is designated as Not Recommended for New Designs by the manufacturer. Confirm availability through authorized distributors, noting that production may be limited or discontinued. Ensure that current stock meets project requirements, as future supply might be constrained due to the obsolescence notice.

Selection Notes

Select this component only if legacy compatibility with the C8051F55x series is required or if existing designs utilize this specific pinout and feature set. Evaluate alternative newer generation microcontrollers from Silicon Labs for new projects to ensure long-term supply stability. Consider the 24-pin QFN package constraints and verify that the 16 kB Flash capacity suffices for the intended application firmware size.

Part Context

This device belongs to the C8051F55x/56x/57x family of mixed-signal MCUs, which are designed for applications demanding high integration in small form factors. The family shares architectural similarities but varies in memory size and I/O count. The C8051F557 specifically offers a balanced configuration with 16 kB Flash and 18 port I/Os, suitable for cost-sensitive embedded applications.

Replacement Considerations

Consult official Silicon Labs documentation for direct pin-compatible replacements within the same family or updated generations. Verify electrical characteristics and software compatibility when migrating to successor models.

FAQ

Does the C8051F557-IM require an external crystal for CAN operation?

No, the device features an internal 24 MHz oscillator with ±0.5% accuracy that supports CAN and master LIN operation without requiring an external crystal.

What is the maximum sampling rate of the integrated ADC?

The 12-bit ADC supports a maximum sampling rate of up to 200 ksps.