C8051F021R

Overview

The C8051F021R is a mixed-signal 8-bit microcontroller featuring a high-speed 8051 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 12-bit, 8-channel ADC with 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. It operates within a supply voltage range of 2.7 V to 3.6 V and supports temperatures from -40°C to +85°C.

Feature Summary

• High-performance pipelined 8051 core delivering up to 25 MIPS throughput
• Integrated precision analog subsystem including 12-bit ADC and dual 12-bit DACs
• On-chip JTAG debug circuitry enabling full-speed non-intrusive in-circuit debugging
• In-system programmable Flash memory allowing sector-based updates without external programming equipment

Applications

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

Procurement Notes

Verify the specific suffix 'R' against the manufacturer's current documentation to confirm reel packaging specifications and moisture sensitivity level requirements. Ensure compatibility with Silicon Labs C2 or JTAG debug adapters for firmware loading. Confirm RoHS compliance status as indicated in the latest datasheet revision prior to procurement.

Selection Notes

Select this component when a fully integrated mixed-signal solution is required without external analog components. The C8051F021R is suitable for designs needing simultaneous digital communication and precise analog signal processing. Consider the 64 kB Flash capacity and 4.25 kB RAM limits against application software size requirements before finalizing the selection.

Part Context

This part belongs to the C8051F02x family of highly integrated mixed-signal microcontrollers from Silicon Labs. These devices are designed to reduce system component count by combining a fast 8051 CPU with extensive on-chip analog and digital peripherals. The family shares a common architecture but varies in memory size and peripheral configurations.

Replacement Considerations

Silicon Labs recommends the EFM8BB31F64G-QFN32 as a replacement for the C8051F021 series. Verify pinout compatibility and register mapping differences during migration.