C8051F385-GQR

Overview

The C8051F385-GQR is an 8-bit microcontroller from the Silicon Labs C8051F38x family, featuring a high-speed 8051 core operating at up to 48 MIPS. It integrates 64 kB of in-system programmable Flash memory and 4352 bytes of RAM. The device includes a USB 2.0 compliant full-speed function controller with integrated transceiver and clock recovery. Digital peripherals consist of two I2C/SMBus interfaces, two UARTs, one SPI, six 16-bit timers, and a Programmable Counter Array. It operates within a voltage range of 2.7 V to 5.25 V and supports temperatures from -40°C to +85°C.

Feature Summary

• Integrates a USB 2.0 full-speed function controller with built-in transceiver and clock recovery, eliminating the need for external crystals or resistors.
• Features a pipelined 8051 core capable of executing 70% of instructions in one or two system clocks for high-performance processing.
• Includes extensive analog peripherals such as comparators, internal voltage references, and temperature sensors for signal conditioning.
• Provides flexible digital connectivity through multiple serial interfaces including SPI, I2C/SMBus, and dual enhanced UARTs.

Applications

• USB-enabled embedded control systems
• Data acquisition devices requiring analog signal processing
• Industrial communication gateways
• Portable battery-powered instrumentation

Procurement Notes

Verify the specific package variant matches the design requirements, as the GQR suffix indicates a 32-pin LQFP package. Confirm that the selected part belongs to the C8051F385 model which lacks the 10-bit ADC found in other family members like the F380. Ensure compatibility with existing debug tools supporting the C2 interface for programming and in-system debugging.

Selection Notes

Select this component when a compact 32-pin solution with native USB connectivity is required without external passive components for the USB interface. It is suitable for applications needing moderate Flash capacity and robust digital communication interfaces. Consider alternative models if higher resolution analog-to-digital conversion is necessary, as this specific variant does not include the 10-bit ADC peripheral available in other family members.

Part Context

This microcontroller belongs to the C8051F38x series of mixed-signal System-on-Chip solutions. The series is characterized by its fully integrated USB functionality and high-speed 8051 architecture. While sharing the same core and many peripherals, variants within the family differ in memory size, package options, and the presence of specific analog features like the 10-bit ADC.

Replacement Considerations

Direct substitutes within the same family include C8051F381-GQR, C8051F383-GQR, and C8051F387-GQR, which share identical pinouts and core specifications but may vary in memory configuration or package availability.

FAQ

Does the C8051F385-GQR include a 10-bit Analog-to-Digital Converter?

No, the 10-bit ADC is only available on the C8051F380/1/2/3/C models within the family. The C8051F385 relies on external components or other analog peripherals for signal conversion.

Is an external crystal required for USB operation?

No, the device features an integrated clock recovery circuit that allows full-speed USB operation without an external crystal or additional passive components.