C8051F503-IQ

Overview

The C8051F503-IQ is an automotive-qualified, mixed-signal ISP Flash MCU from the C8051F50x family. It features a high-speed pipelined 8051 core operating up to 50 MHz with 50 MIPS throughput. The device integrates 64 kB of in-system programmable Flash memory and 4352 bytes of internal data RAM (including 4096 bytes XRAM). Key peripherals include a 12-bit ADC supporting up to 200 ksps, two voltage comparators, CAN 2.0 and LIN 2.1 controllers, hardware UART, SMBus, SPI, four 16-bit timers, and a PCA. It operates on a supply voltage of 1.8 V to 5.25 V and supports a temperature range of –40 °C to +125 °C.

Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for extended temperature operation.
• Integrated CAN 2.0 and LIN 2.1 controllers enabling direct network connectivity without external transceivers or crystals.
• High-performance CIP-51 core executing 70% of instructions in one or two system clocks.
• Flexible digital crossbar architecture allowing dynamic assignment of peripheral functions to I/O pins.

Applications

• Automotive body control modules
• Industrial motor drives
• Sensor interface units

Procurement Notes

Verify component authenticity through authorized Silicon Labs distributors. Confirm package type matches design requirements as suffixes indicate specific physical form factors. Check current lifecycle status as this series may be subject to discontinuation notices. Ensure environmental compliance documentation aligns with target market regulations.

Selection Notes

Select this model when automotive reliability and integrated bus controllers are required. The C8051F503 variant provides 25 port I/O lines suitable for moderate pin-count designs. Consider the -IQ suffix for the specific QFN-32 package option. Evaluate power consumption profiles against application duty cycles given the wide operating voltage range.

Part Context

This microcontroller belongs to the C8051F50x/F51x family of fully integrated mixed-signal SoCs. These devices combine a fast 8051-compatible CPU with extensive analog and digital peripherals on a single chip. The family targets applications requiring robust communication interfaces and precise signal conditioning within a compact footprint.

Replacement Considerations

Consult official Silicon Labs obsolescence notifications for valid substitute part numbers. Cross-reference pinouts and electrical characteristics carefully before substituting components from other manufacturers.

FAQ

Does the C8051F503 require an external crystal for CAN or LIN operation?

No, the device includes a precision internal 24 MHz oscillator specifically designed for 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.