C8051F391-A-GMR

Overview

The C8051F391-A-GMR is an 8-bit mixed-signal microcontroller from the C8051F39x family, manufactured by Silicon Labs. It features a pipelined 8051 core with up to 50 MIPS throughput at 50 MHz. The device includes 16 kB of in-system programmable Flash memory and 1 kB of internal data RAM (256 bytes + 768 bytes XRAM). Key peripherals include a 10-bit ADC with up to 500 ksps throughput, two 10-bit current output DACs, an analog comparator, and a precision temperature sensor. It operates on a supply voltage of 1.8 V to 3.6 V and is housed in a 24-pin QFN package.

Feature Summary

• High-speed 8051 core with pipelined architecture executing 70% of instructions in one or two system clocks
• Integrated mixed-signal peripherals including a 10-bit ADC, dual 10-bit current mode DACs, and analog comparator
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators
• Flexible clocking system with a calibrated 49 MHz internal oscillator supporting crystal-less UART operation

Applications

• Battery-powered systems requiring low power consumption and high integration
• Industrial control applications utilizing analog signal processing and monitoring
• Consumer electronics devices needing compact form factor and mixed-signal capabilities
• Embedded systems requiring in-circuit reprogrammable firmware updates

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated in official documentation. Check for moisture sensitivity labeling prior to storage and handling. Ensure ordering suffixes match specific package and temperature range requirements. Review datasheet revision history for any functional updates or errata affecting implementation.

Selection Notes

Select this MCU for designs prioritizing small footprint and mixed-signal integration within the 8-bit architecture space. Consider the 24-pin QFN package for space-constrained PCB layouts. Evaluate peripheral needs against the specific F391 configuration, noting that some variants may lack EEPROM or specific analog blocks. Ensure software development tools support the CIP-51 core and C2 interface for efficient programming and debugging workflows.

Part Context

The C8051F391-A-GMR belongs to the C8051F39x family, which serves as a next-generation upgrade to the C8051F33x series. It maintains hardware and code compatibility while offering increased speed, more RAM, and extended temperature ranges. This family represents Silicon Labs' strategy to provide high-performance, system-on-chip solutions in ultra-small packages for cost-sensitive embedded applications.

Replacement Considerations

The C8051F390, C8051F394, C8051F395, and C8051F37x series are pin-compatible alternatives within the same family. Verify specific peripheral availability, such as EEPROM presence in F37x models or additional ADC channels in other variants, before substitution. Ensure temperature range specifications align with application requirements, as F39x supports -40 to +105 °C.