C8051F545-IQR

Overview

The C8051F545-IQR is an automotive and industrial qualified mixed-signal microcontroller from the C8051F54x family. It features a high-speed 8051 core with up to 50 MIPS throughput at a 50 MHz clock frequency. The device includes 16 kB of in-system programmable Flash memory, 1280 bytes of internal data RAM (256 + 1024 XRAM), and a 12-bit ADC supporting up to 200 ksps sampling rate with up to 25 external single-ended inputs. It operates within a supply voltage range of 1.8 V to 5.25 V and supports an operating temperature range of –40 °C to +125 °C. The component is housed in a 32-pin QFN package.

Feature Summary

• Integrated LIN 2.1 controller capable of both master and slave operations without requiring an external crystal.
• On-chip debug circuitry enables full-speed, non-intrusive in-system debugging without additional emulation hardware.
• Includes two comparators with programmable hysteresis and response time, configurable as interrupt or reset sources.
• Features a pipelined instruction architecture that executes 70% of instructions in one or two system clocks.

Applications

• Automotive communication systems utilizing LIN bus protocols
• Industrial control applications requiring robust analog signal processing
• Sensor interface modules for environmental monitoring
• Battery management systems with integrated voltage regulation

Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature grade. Confirm end-of-life status as the C8051F54x series is marked Not Recommended for New Designs. Ensure compatibility with existing design tools and development kits before finalizing procurement decisions.

Selection Notes

Select this component when automotive qualification and LIN bus integration are required in a compact form factor. Consider the 12-bit ADC resolution and speed for precision analog tasks. Evaluate the 1.8 V to 5.25 V supply range against power constraints. Review pinout compatibility with other C8051F54x variants if migration is planned.

Part Context

The C8051F545-IQR belongs to the C8051F54x family of mixed-signal MCUs designed for space-constrained applications. It offers pin-for-pin compatibility with other members of the C8051F54x, C8051F58x/59x, C8051F55x/56x/57x, and C8051F50x/1x series. This allows for flexible design upgrades within the same footprint while maintaining software and hardware compatibility.

Replacement Considerations

Check for direct pin-compatible replacements within the C8051F54x family. Verify if newer Silicon Labs automotive MCU families offer equivalent functionality with updated support status.

FAQ

Does the C8051F545-IQR require an external crystal for LIN operation?

No, the device includes an internal 24 MHz oscillator with ±0.5% accuracy, which is sufficient for master LIN operation without an external crystal.

What is the maximum sampling rate of the integrated ADC?

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

Is the C8051F545-IQR suitable for automotive applications?

Yes, it is automotive qualified and compliant with AEC-Q100 standards, supporting an operating temperature range of –40 °C to +125 °C.