C8051F343-GMR

Overview

The C8051F343-GMR is a fully integrated mixed-signal System-on-Chip MCU from the C8051F34x family, designed for USB applications. It features a high-speed pipelined 8051-compatible core operating at up to 48 MIPS with a maximum clock frequency of 25 MHz. The device includes 32 kB of in-system programmable Flash memory and 2304 Bytes of RAM. Key peripherals include a full-speed USB 2.0 function controller with an integrated transceiver and clock recovery, a 10-bit ADC supporting up to 200 ksps, two analog comparators, and multiple digital communication interfaces such as UART, SPI, and SMBus. It operates within a voltage range of 2.7 V to 5.25 V using an on-chip regulator and supports industrial temperatures from -40 °C to +85 °C.

Feature Summary

• Integrated full-speed USB 2.0 function controller with built-in transceiver and clock recovery, eliminating the need for external crystals or resistors.
• High-performance 8051 microcontroller core delivering up to 48 MIPS throughput with a pipelined instruction architecture.
• On-chip debug circuitry enabling non-intrusive in-system debugging without requiring external emulation hardware.
• Mixed-signal capabilities including a 10-bit ADC, analog comparators, and a temperature sensor for direct signal processing.

Applications

• PC peripherals
• Point-of-sale (POS) terminals
• Medical diagnostic equipment
• Embedded modems

Procurement Notes

Verify component authenticity through authorized Silicon Labs distributors or certified partners. Confirm the specific revision level matches project requirements, as datasheet revisions may update electrical characteristics or pin definitions. Ensure the package type corresponds to the PCB footprint design. Check for end-of-life status, as this model is marked Not Recommended for New Designs, which may impact long-term supply chain stability.

Selection Notes

Select this MCU when a complete USB solution is required without external PHY components. The 32 kB Flash variant is suitable for firmware-heavy applications needing field upgrades. Consider the 25 MHz clock speed for cost-sensitive designs where higher throughput is unnecessary. Verify that the 2304 Byte RAM suffices for real-time data handling. Evaluate the 10-bit ADC resolution against application precision needs before choosing over lower-resolution alternatives.

Part Context

The C8051F343 belongs to the C8051F34x series, which shares a common architecture but varies in memory size and package options. This specific part uses a 32-pin LQFP or QFN package, distinguishing it from the 48-pin TQFP variants like the C8051F340. It offers a balance of performance and integration, sitting between the smaller C8051F32x and larger memory configurations in the family.

Replacement Considerations

Public confirmed substitute part numbers: C8051F342, C8051F346, C8051F34A.

FAQ

Does the C8051F343 require an external crystal for USB operation?

No, the device features an integrated clock recovery mechanism that allows full-speed USB operation without an external crystal.

What is the maximum sampling rate of the onboard ADC?

The 10-bit Analog-to-Digital Converter supports a maximum sampling rate of 200 ksps.