C8051F385-GM

Overview

The C8051F385-GM is a Full Speed USB Flash Microcontroller from the Silicon Labs C8051F38x family. It features a high-speed 8051 core operating up to 48 MIPS with pipelined architecture. The device integrates a USB 2.0 compliant controller supporting full speed (12 Mbps) and low speed (1.5 Mbps) modes, utilizing an integrated transceiver and clock recovery without external crystals. Memory configuration includes 32 kB of in-system programmable Flash and 2304 Bytes of RAM. Digital peripherals comprise four I2C/SMBus ports, two enhanced UARTs, one SPI port, six 16-bit timers, and a Programmable Counter Array with five capture/compare modules. Analog features include two comparators, a brown-out detector, and power-on reset circuitry. The unit operates on a voltage supply input of 2.7 to 5.25 V and is housed in a 32-pin LQFP or QFN package.

Feature Summary

• Integrated USB 2.0 full-speed controller with built-in transceiver and clock recovery eliminating external crystal requirements for USB operation.
• High-performance 8051 microcontroller core executing up to 48 MIPS with a pipelined instruction architecture.
• On-chip debug circuitry enabling non-intrusive in-system debugging with breakpoints and memory inspection capabilities.
• Versatile digital peripheral set including multiple serial interfaces, general-purpose timers, and a programmable counter array.

Applications

• USB-enabled data acquisition systems
• Industrial communication gateways
• Embedded control interfaces requiring direct USB connectivity

Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature range. Confirm that the component selection aligns with the manufacturer's current design recommendations, as this family may be subject to lifecycle status changes. Ensure compatibility with existing development tools and debuggers before finalizing procurement decisions.

Selection Notes

Select this model when a complete USB solution is needed without external PHY components. The integrated clock recovery simplifies board layout by removing the need for a dedicated USB crystal. Consider the 32 kB Flash size for application code storage requirements and verify that the 2304 Byte RAM suffices for runtime data handling needs within the target embedded environment.

Part Context

This component belongs to the C8051F38x series of mixed-signal microcontrollers. It shares architectural similarities with other members of the family but differs in memory capacity and analog peripheral availability. The part is designed for applications requiring robust USB connectivity alongside standard microcontroller functions, offering a compact solution for system integration.

Replacement Considerations

Direct substitutes within the same family include C8051F381, C8051F383, and C8051F387, which share identical pinouts and core functionality but vary in Flash memory size. Verify that any replacement part meets the specific memory requirements of the original design.

FAQ

Does the C8051F385 require an external crystal for USB communication?

No, the device features integrated clock recovery that allows it to operate in full-speed or low-speed USB mode without an external crystal.

What is the maximum operating frequency of the CPU core?

The high-speed 8051 microcontroller core can operate at speeds up to 48 MIPS.