C8051F321

Overview

The C8051F321 is an 8-bit microcontroller from Silicon Labs featuring a high-speed 8051 core with up to 25 MIPS throughput at a 25 MHz clock. It integrates a full-speed USB 2.0 function controller with an integrated transceiver and on-chip clock recovery, eliminating the need for external components. The device includes 16 KB of in-system programmable FLASH memory and 2304 bytes of internal RAM. Analog peripherals consist of a 10-bit ADC supporting up to 200 ksps, two comparators, and a temperature sensor. Digital interfaces include SPI, UART, and SMBus. It operates within a voltage range of 2.7V to 3.6V and is available in a 28-pin MLP package.

Feature Summary

• Integrated full-speed USB 2.0 controller with built-in transceiver and clock recovery
• High-performance 8051 CPU executing up to 25 MIPS
• On-chip debug circuitry enabling non-intrusive in-system debugging
• Comprehensive analog suite including 10-bit ADC and dual comparators

Applications

• Embedded USB connectivity solutions
• USB FM radio designs
• In-system programming tools

Procurement Notes

Verify the specific package type, as the C8051F321 utilizes a 28-pin MLP form factor distinct from the LQFP variant. Confirm RoHS compliance status and check for obsolescence notices, as availability may vary. Ensure development tools support the C2 interface for programming and debugging this specific silicon revision.

Selection Notes

Select the C8051F321 when a compact 28-pin solution is required for USB applications compared to the 32-pin C8051F320. Consider the pin count reduction against I/O requirements. Verify that the 16 KB FLASH capacity meets application storage needs. Evaluate the 25 MHz maximum speed against processing demands.

Part Context

This component belongs to the C8051F32x/34x family of USB microcontrollers. These devices are designed to provide single-chip solutions for embedded USB applications by integrating the USB function controller directly onto the die. The family shares common specifications such as the 8051 core architecture and peripheral sets, differing primarily in memory size and package options.

Replacement Considerations

C8051F320 serves as a direct functional alternative with identical specifications but utilizes a 32-pin LQFP package instead of the 28-pin MLP.