Introduction In 2014, the DiiA Alliance revised the DALI standard, optimizing the original version and adding many features to ensure compatibility with major manufacturers’ DALI products on the market, while also being compatible with the original DALI 1.0. DALI 2.0 introduced the Control device (Master) standard, and the number of DALI 2.0 test commands has increased to over 200.
The testing standards for DALI 2.0 are more stringent, requiring the purchase of specialized testing equipment or engaging third-party testing organizations. To print the DALI 2.0 logo on a product, it must become a member of the DiiA Alliance and pass the DALI 2.0 testing standards.
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DALI: Digital Addressable Lighting Interface, which is a digital addressable lighting interface.
DALI is an international standard for digital lighting control, a publicly available specification for lighting control communication protocols that defines the communication method between electronic ballasts and device controllers, compliant with IEC 60929/IEC 62386 standards, ensuring good compatibility with any device that meets the DALI protocol. By inputting standard DALI signals, using Manchester encoding for digital transmission, it achieves functions such as switching, dimming, scene setting, grouping, and addressing.
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Beineng International strongly promotes Microchip‘s latestDALI 2.0 lighting control solution, which is suitable for various commercial and architectural lighting applications.
Solution Overview
The solution is equipped with Microchip’s latest AVR MCU, compatible with IEC62386-101/102 and IEC62386-207 (DT6) standards, achieving full-range dimming. The MCU has built-in Core Independent Peripherals (CIP) that allow users to add custom functions easily, greatly simplifying the DALI device development process. Compared to DALI 1.0, the new 2.0 solution aims to reduce the overall complexity of intelligent lighting systems and enhance programming flexibility, making the system more competitive and expanding the range of product applications.
Implementation Principle
It receives commands from the master station on the DALI bus, and the onboard MCU ATtiny1617 uses a bit-banging mode, utilizing its external interrupts and timers to complete the encoding and decoding of the DALI 2.0 protocol, achieving PWM dimming for LEDs. The DALI 2.0 software protocol occupies less than 8KB of Flash, and this solution has passed the DALI 2.0 protocol standard testing. All software and hardware are completely open-source and can be downloaded from the Microchip website, providing great convenience for engineers designing DALI 2.0.
Solution Features
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Compatible with DALI 1.0
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Compliant with IEC62386-101/102 and IEC62386-207 (DT6) standards
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DALI 2.0 software protocol stack < 8KB
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Supports 0-100% full-range PWM dimming
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Provides programming and debugging UPDI interface
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MCU core independent peripherals (CIP)
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16KB Flash in addition to DALI protocol for user-defined functions
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USB 5VDC powered MCU, DALI bus 16VDC
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Wide temperature range -40°C to +105°C
Hardware Block Diagram
The DALI interface for DALI 2.0 is identical to DALI 1.0, with a simple hardware circuit. The DALI interface consists of a rectifier bridge, a comparator, and two optocouplers, with the MCU handling the DALI protocol part, using the ATtiny1617, connecting to the DALI interface, and ultimately achieving PWM dimming for LEDs.
Software Architecture
This solution utilizes the MCU’s external interrupts, timers, and internal EEPROM. The MCU’s driver initialization part is configured through ATMEL START, and the DALI protocol software is ready for API function calls, allowing customers to focus on writing their application programs. The open-source software source code can be downloaded from the Microchip website.
Solution Advantages
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Open-source reference design, software source code, Gerber, PCB, schematics, etc.
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The DALI protocol part can be seamlessly migrated between tinyAVR 1 series MCUs without modifying the software.
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Compliant with IEC62386 standards, compatible with any device that meets the DALI protocol.
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Compatible with DALI 1.0, easily portable to DALI 2.0.
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Atmel Studio/START development tools are user-friendly, shortening customer product development time.
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Has passed CE/FCC certification.
Application Fields
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Suitable for various commercial and architectural lighting applications.
Development Tool Support
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Atmel Studio 7
Atmel Studio 7 is available for free and integrates the Atmel Software Framework (ASF); it facilitates the reuse of existing software for differentiated designs; integrated tools and software extensions can be easily accessed through Atmel Gallery; providing advanced features, an extensible software ecosystem, and robust debugging integration.
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Atmel START
Atmel START is a web-based software configuration tool that helps developers reduce the time spent integrating software components for specific boards and devices, allowing products to reach the market faster.
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