C8051F042

Overview

The C8051F042 is an 8-bit mixed-signal microcontroller from Silicon Labs, featuring a high-speed CIP-51 core operating at up to 25 MHz. It integrates 64 kB of in-system programmable Flash memory and 4352 bytes of internal data RAM. The device includes a 10-bit SAR ADC with 13 external inputs, three analog comparators, and a built-in temperature sensor. Digital peripherals support CAN 2.0B, SMBus, SPI, and dual UARTs. It operates on a 2.7 V to 3.6 V supply within a -40 °C to +85 °C temperature range.

Feature Summary

• High-performance pipelined 8051 core executing most instructions in one or two system clocks
• Integrated 10-bit SAR ADC with programmable gain amplifier and windowed interrupt generator
• On-chip JTAG debug circuitry enabling full-speed non-intrusive in-circuit debugging
• Hardware serial interfaces including CAN 2.0B, SMBus, SPI, and dual UARTs

Applications

• Industrial control systems requiring CAN communication
• Data acquisition systems utilizing the integrated ADC and comparators
• Portable instruments powered by low-voltage supplies
• Sensor interface circuits with temperature monitoring capabilities

Procurement Notes

Verify the specific package variant (TQFP-100 or TQFP-64) required for your design, as pinouts differ between configurations. Confirm that the 10-bit ADC resolution meets your application needs, as other variants in this family offer 12-bit resolution. Ensure development tools are compatible with the CIP-51 architecture for programming and debugging purposes.

Selection Notes

Select the C8051F042 when a balance of moderate Flash capacity and mixed-signal integration is required. It is suitable for designs needing hardware CAN support without external transceivers. Consider alternative models if higher ADC resolution or different I/O counts are necessary. Evaluate power consumption requirements against the available sleep modes for battery-operated applications.

Part Context

This component belongs to the C8051F04x series of fully integrated mixed-signal System-on-Chip microcontrollers. The series shares a common CIP-51 core and peripheral set, differing primarily in Flash size, ADC resolution, and package options. It represents a generation of highly integrated 8-bit MCUs designed to reduce board space and component count.

Replacement Considerations

No direct public substitute part numbers are confirmed for this specific model.