C8051F399-A-GMR

Overview

The C8051F399-A-GMR is an 8-bit mixed-signal microcontroller from the Silicon Labs C8051F39x family. It features a pipelined CIP-51 core operating at up to 50 MHz with 50 MIPS throughput. The device includes 16 kB of in-system programmable Flash memory, 1 kB of internal data RAM (256 bytes + 768 XRAM), and 512 bytes of EEPROM. Key peripherals include a 10-bit ADC with 500 ksps throughput, two 10-bit current-mode DACs, an analog comparator, and a precision temperature sensor. It operates on a 1.8 V to 3.6 V supply and supports -40 °C to +105 °C temperatures.

Feature Summary

• High-performance 8051-compatible architecture with pipelined instruction execution for fast processing speeds.
• Integrated mixed-signal capabilities including a high-speed 10-bit ADC, dual 10-bit current-output DACs, and an analog comparator.
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators.
• Flexible clocking system with a calibrated internal oscillator supporting crystal-less UART operation and low-power modes.

Applications

• Industrial control systems requiring precise analog signal acquisition
• Battery-powered devices utilizing low-power stop and suspend modes
• Data acquisition systems leveraging the high-speed ADC and DACs
• Temperature monitoring applications using the integrated precision sensor

Procurement Notes

Verify the specific suffix 'A' corresponds to the extended temperature range (-40 °C to +105 °C) as defined in the official datasheet. Confirm package type QFN-20 matches the design footprint. Check for 'Not Recommended for New Designs' status if planning new hardware implementations. Ensure voltage supply requirements align with the 1.8 V to 3.6 V operational range.

Selection Notes

Select this component when a small form factor MCU with integrated analog peripherals is required. It is suitable for designs needing direct ADC/DAC functionality without external chips. Consider the 16 kB Flash limit for firmware size. Evaluate power consumption against active mode currents if battery life is critical. Compare pin count and peripheral availability against other C8051F39x variants.

Part Context

This part belongs to the C8051F39x family, which serves as a next-generation upgrade to the C8051F33x series. It maintains code and footprint compatibility while offering increased speed, more RAM, and extended temperature ranges. The family emphasizes system-on-a-chip integration with on-chip reset monitors and oscillators.

Replacement Considerations

Direct substitutes within the same family include C8051F392, C8051F393, C8051F396, C8051F397, and C8051F398, which share the QFN-20 package and similar specifications but may differ in Flash or EEPROM capacity.

FAQ

Does the C8051F399-A-GMR support in-circuit reprogramming?

Yes, the Flash memory can be reprogrammed in-circuit, allowing for field upgrades of the 8051 firmware.

What is the accuracy of the on-chip temperature sensor?

The precision temperature sensor is accurate to ±2 °C across the temperature range without requiring user calibration.

Can the device operate without an external crystal?

Yes, the calibrated internal 49 MHz oscillator supports crystal-less UART operation and can be used as the primary system clock source.