C8051F387-GM

Overview

The C8051F387-GM is a mixed-signal system-on-chip microcontroller from Silicon Labs, featuring an 8051 core operating at up to 48 MHz. It integrates 32 kB of in-system programmable Flash memory and 2.3 kB of RAM. The device includes a full-speed USB 2.0 controller with integrated transceiver, supporting eight flexible endpoints and 1 kB of buffer memory. Analog peripherals consist of a 10-bit ADC capable of 500 ksps, two comparators, and a temperature sensor. Digital interfaces include two I²C/SMBus ports, one SPI port, and two UARTs. 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 clock recovery and transceiver
• High-performance pipelined 8051 core executing instructions in 1 or 2 system clocks
• On-chip debug circuitry enabling non-intrusive in-system debugging without external emulators
• Flexible interrupt handling and programmable digital crossbar for peripheral pin configuration

Applications

• Medical diagnostic equipment
• Point-of-sale (POS) terminals
• Embedded modems
• Voice over Internet Protocol (VoIP) telephones

Procurement Notes

Verify the specific package variant, as the C8051F38x family utilizes QFN-32, LQFP-32, or TQFP-48 packages depending on the suffix. Confirm that the application design accommodates the specified voltage range and thermal requirements. Check for any obsolescence notices, as this series may be marked as not recommended for new designs. Ensure compatibility with existing firmware architectures when migrating from legacy components.

Selection Notes

Select this component for applications requiring high integration of analog and digital functions alongside USB connectivity. The internal oscillator supports USB clocking without external crystals, reducing bill of materials. Consider the available Flash size and RAM capacity against software complexity. Evaluate the need for the specific I/O count and peripheral set, such as the number of timers or serial ports required for the target system.

Part Context

This part belongs to the C8051F38x family of highly integrated mixed-signal microcontrollers. The family shares a common architecture but varies in memory size and package options. The C8051F387 variant specifically provides 32 kB of Flash memory. Other members in the series include variants with 16 kB or 64 kB of Flash, catering to different storage requirements while maintaining identical peripheral sets and core performance characteristics.

Replacement Considerations

Direct replacements within the same family include C8051F380, C8051F381, C8051F382, C8051F383, C8051F384, C8051F385, C8051F386, and C8051F38C. These parts share functional compatibility but differ in Flash memory capacity or package type. Verify pinout and memory specifications before substitution.