C8051F021

Overview

The C8051F021-GQR is a mixed-signal System-on-Chip microcontroller from Silicon Labs, featuring an 8051-compatible core operating at up to 25 MHz. It integrates 64 KB of in-system programmable Flash memory and 4352 bytes of internal RAM. The device includes a 12-bit SAR ADC with up to 8 external inputs and 100 ksps throughput, two 12-bit DACs, and two analog comparators. Digital peripherals consist of hardware SMBus, SPI, and dual UART interfaces, alongside five 16-bit timers and a Programmable Counter Array. It operates within a 2.7V to 3.6V supply range and supports -40°C to +85°C temperatures.

Feature Summary

• High-speed pipelined 8051 core delivering up to 25 MIPS throughput
• Integrated 12-bit ADC with programmable gain amplifier and windowed interrupt generator
• Dual 12-bit DACs capable of synchronized timer-triggered waveform generation
• On-chip JTAG debug circuitry supporting full-speed non-intrusive in-circuit debugging

Applications

• Portable medical equipment
• Weigh scales
• Test equipment
• Fiber optic systems

Procurement Notes

Verify the specific suffix 'GQR' corresponds to the TQFP-64 package variant when sourcing. Confirm that the component status aligns with current availability, as EOL announcements may apply to this family. Ensure compatibility with required development tools such as Simplicity Studio or Keil C51 for programming via the C2 interface.

Selection Notes

Select the C8051F021 over variants like the F020 or F022 based on the requirement for a 12-bit ADC resolution combined with specific I/O port configurations. This model provides four byte-wide ports (Ports 1-4) which are 5V tolerant, differing from other members of the F02x family. Consider the integrated analog features against the need for external components if higher channel counts are required.

Part Context

This component belongs to the C8051F02x series of highly integrated mixed-signal microcontrollers. These devices utilize the CIP-51 architecture, offering improved instruction throughput compared to standard 8051 cores. The series is designed for applications requiring significant analog processing capabilities within a single chip, reducing system complexity and board space requirements.

Replacement Considerations

Silicon Labs recommends the EFM8BB31F64G-QFN32 as a replacement for the C8051F021. Note that the EFM8 Busy Bee series utilizes a different architecture and pinout, requiring significant software and hardware redesign rather than being a direct drop-in substitute.