C8051F381-GMR

Overview

The C8051F381-GMR is an 8-bit microcontroller from Silicon Labs, part of the Full Speed USB Flash MCU family. It features a high-speed 8051 core operating at up to 48 MIPS and includes 64 kB of in-system programmable Flash memory along with 4352 bytes of RAM. The device integrates a USB 2.0 compliant controller supporting full speed (12 Mbps) and low speed (1.5 Mbps) operation without requiring an external crystal. Analog peripherals include a 10-bit ADC capable of up to 500 ksps conversion rates and two comparators. Digital interfaces consist of hardware-enhanced SPI, dual I2C/SMBus ports, and dual UARTs. It operates within a voltage range of 2.7 V to 5.25 V and is housed in a 32-pin QFN package.

Feature Summary

• Integrates a high-speed pipelined 8051 core with on-chip USB 2.0 controller and transceiver
• Includes a 10-bit analog-to-digital converter with built-in multiplexer and temperature sensor
• Features extensive digital communication capabilities including dual UARTs, dual SMBus, and SPI
• Supports non-intrusive in-system debugging via on-chip debug circuitry

Applications

• USB-enabled embedded systems
• Data acquisition devices
• Industrial control applications
• Medical diagnostic equipment

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated in official documentation. Check for specific revision markings on the package to ensure compatibility with existing designs. Review the latest errata sheets for any known silicon revisions or operational limitations before finalizing procurement plans.

Selection Notes

Select this component when a design requires integrated USB connectivity alongside standard 8051 processing capabilities. Ensure the application fits within the 2.7 V to 5.25 V supply voltage range. Verify that the 32-pin QFN package dimensions align with the PCB layout constraints. Consider the available GPIO count and peripheral requirements against the specific needs of the target system architecture.

Part Context

This device belongs to the C8051F38x series of mixed-signal microcontrollers. It is designed for applications demanding high performance and rich peripheral integration in a compact form factor. The series supports both internal and external clock sources, allowing flexibility in system timing configurations. It is widely used in environments requiring robust analog signal processing combined with digital communication protocols.

Replacement Considerations

Consult official substitution guides for compatible alternatives within the same product family. Verify pinout compatibility and electrical characteristics before transitioning to substitute part numbers.