What is it

The module dispenses with the use of an external high-frequency resonator. The clocking of the uC is generated by an internal RC resonator. It has sufficient accuracy for most applications, which can be further improved by internal calibration using the mounted RTC resonator (32768 Hz). This also allows the uC's clock frequency to be changed even during programme execution. A dedicated voltage regulator has also been dispensed with, as the uCs of the AVR Dx family operate stably over the full supply voltage range: 1.8-5.5V with a maximum clock frequency of 24MHz.

Motivation

The Arduino Pro Mini Dx module was developed to address the limitations of the traditional Arduino Pro Mini, which relies on the ATmega328P processor. The primary objective was to create a modernized, drop-in replacement module that leverages the advanced capabilities of the AVR Dx microcontroller family. This upgrade enables a significant increase in program memory (up to 128kB of FLASH), providing greater capacity for complex applications. Additionally, the inclusion of new peripherals enhances the module’s functionality, making it suitable for a broader range of applications. The project eliminates the need for an external high-frequency resonator by utilizing the microcontroller’s internal RC resonator, which offers sufficient accuracy for most use cases and can be fine-tuned using the onboard RTC resonator (32768 Hz). This design choice simplifies the hardware, reduces costs, and allows for dynamic clock frequency adjustments during program execution. Furthermore, the decision to forgo a dedicated voltage regulator takes advantage of the AVR Dx family’s stable operation across a wide voltage range (1.8-5.5V) at a maximum clock frequency of 24MHz, enhancing power efficiency and flexibility. The Arduino Pro Mini Dx was likely created to provide developers with a more powerful, efficient, and versatile microcontroller module while maintaining compatibility with the familiar Arduino Pro Mini form factor. This ensures seamless integration into existing projects, enabling users to upgrade their systems without requiring significant redesigns.

Features

The Arduino Pro Mini Dx module is distinguished by its innovative design and enhanced capabilities, making it a significant advancement over the traditional Arduino Pro Mini based on the ATmega328P processor. The key features that make it special include:

• Upgraded Microcontroller: The module utilizes the AVR Dx family of microcontrollers (AVR128DB32T-E/RXB), offering up to 128kB of FLASH memory. This substantial increase in program storage capacity supports more complex and feature-rich applications compared to the ATmega328P’s limitations.
• Elimination of External Resonator: By relying on the microcontroller’s internal RC resonator for clocking, the module eliminates the need for an external high-frequency resonator. This reduces hardware complexity and cost while maintaining sufficient accuracy for most applications. The onboard RTC resonator (32768 Hz) further enables internal calibration for improved precision and supports dynamic clock frequency adjustments during program execution.
• Wide Voltage Range and Power Efficiency: The AVR Dx microcontrollers operate stably across a supply voltage range of 1.8-5.5V at a maximum clock frequency of 24MHz, without requiring a dedicated voltage regulator. This enhances power efficiency and simplifies the design, making the module suitable for a variety of low-power and battery-operated applications.
• Form Factor Compatibility: The module retains the Arduino Pro Mini form factor, allowing it to serve as a drop-in replacement for existing ATmega328P-based modules. This ensures seamless integration into legacy projects while providing access to modern microcontroller features.
• Expanded Peripheral Support: The AVR Dx family introduces a range of new peripherals, enhancing the module’s versatility for advanced applications such as sensor integration, communication protocols, and real-time processing.

These features collectively make the Arduino Pro Mini Dx a powerful, flexible, and cost-effective solution for developers seeking to upgrade existing Arduino-based projects or create new applications with enhanced performance and efficiency.