C8051F381-GQR

Overview

The C8051F381-GQR is an 8-bit mixed-signal microcontroller from the Silicon Labs C8051F38x family, featuring a high-speed CIP-51 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 full-speed USB 2.0 function controller with integrated transceiver and clock recovery, eliminating the need for external components. Digital peripherals consist of two UARTs, two SMBus/I2C interfaces, one SPI, six 16-bit timers, and a Programmable Counter Array. Analog features include two comparators, a temperature sensor, and brown-out detection. It operates on a voltage supply of 2.7 V to 5.25 V within a temperature range of –40 °C to +85 °C.

Feature Summary

• Integrated full-speed USB 2.0 controller with built-in transceiver and clock recovery for simplified connectivity.
• High-performance pipelined 8051 core executing up to 48 MIPS with expanded interrupt handling capabilities.
• On-chip debug circuitry enabling non-intrusive in-system debugging without external emulators.
• Flexible digital I/O with 5 V tolerance and a programmable digital crossbar for pin configuration.

Applications

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

Procurement Notes

Verify the specific package type matches the design requirements, as the C8051F38x series utilizes multiple form factors including QFN and LQFP. Confirm that the selected variant aligns with the necessary peripheral count, particularly regarding the absence of the 10-bit ADC found in other family members. Ensure compatibility with existing development tools and check for any relevant product change notices affecting manufacturing sites or labeling.

Selection Notes

Select this component when a compact solution with native USB connectivity is required alongside standard serial communication interfaces. The C8051F381-GQR is suitable for designs prioritizing cost-effective integration over high-resolution analog conversion, as it lacks the multi-channel ADC present in the C8051F380/2 variants. Consider the 32-pin footprint constraints and verify that the available GPIO count meets the system interface demands.

Part Context

This part belongs to the C8051F38x series of fully integrated mixed-signal System-on-Chip microcontrollers. Unlike the C8051F380 which offers a 48-pin TQFP package and additional ADC channels, the C8051F381 utilizes a 32-pin package such as QFN or LQFP. It shares the same core architecture and USB capabilities but provides a reduced peripheral set optimized for space-constrained applications.

Replacement Considerations

Direct substitutes within the same family include the C8051F383, C8051F385, and C8051F387, which share identical pinouts and functionality but may differ in Flash capacity or package availability. For legacy replacements, the C8051F340 series offers similar USB and core features but requires verification of software compatibility due to potential hardware incompatibilities noted in documentation.