Welcome to the INACKS IS3720 I2C DMX+RDM Receiver IC Wiki

512 Channels DMX Receiver + RDM Responder In a Single Chip

This information is provided for general informational and presentation purposes only and must not be considered a substitute for the official documentation. For engineering, design, validation, or production use, always refer to the latest datasheet and documentation available on the manufacturer's official website.

Datasheet

Download the last revision of the datasheet: Download IS3720 Datasheet

Buy Now

Visit our product page to place your order: https://www.inacks.com/is3720

General Description

The IS3720 is a chip that combines DMX Receiver + RDM Responder protocols in a single device. It continuously buffers all 512 DMX channels in its memory map, which is accessible by a microcontroller via I2C, and enables bidirectional communications with RDM.

Having RDM provides a multitude of benefits, such as remotely setting its DMX address and automatic patching, making it ideal for large installations and difficult‑to‑access fixtures, such as architectural or underwater lighting.

The IS3720 RDM parameters can be fully customized for your brand. Therefore, when a RDM controller reads your fixture, it will display your company and fixture model names.

The IS3720 frees your microcontroller from the DMX and RDM protocol timing constraints, memory requirements, and ISR load associated with reading and generating DMX and RDM data, reducing the need for timers, flash, RAM, and dedicated pins. All these characteristics help reduce the engineering costs and time required to successfully launch your product to the market.

The device operates at 3.3 V, with 5 V-tolerant I2C and UART, enabling compatibility with 3.3 V or 5 V microcontrollers and RS485 transceivers.

Easy-to-solder SO8N (4.9×6 mm) package, supporting an industrial temperature range (‑40 to 85 °C). Special on-demand packages and temperature ranges are also available: UFQFPN 3×3 mm, WLCSP 1.7×1.42 mm; extended (‑40 to 105 °C) and high (‑40 to 125 °C) temperature ranges.

Applications

• Professional Light Fixtures
• Architectural & Building Lighting
• Stage & Entertainment Lighting
• Facade Lighting
• In-Ground Lighting
• Ornamental Fountain Lighing
• Difficult-Access Lighting
• Digital Art Installations
• Animatronics
• OEM / Device Manufacturers

Main Advantages

• Reduces engineering time and costs.
• Reduces product time-to-market.
• Makes the DMX and RDM protocol transparent to both the microcontroller and the engineer.
• Provides a low-cost solution.
• Fewer ISRs, lower microcontroller CPU load.
• Reduces microcontroller memory usage.
• Saves microcontroller dedicated pins with I2C.
• Minimizes impact on microcontroller peripherals (no need for dedicated timers, UART, etc.).
• Compact, easy-to-solder SO8N package.

DMX, RDM and I2C Characteristics

• Receives from 1 up to all 512 DMX Channels.
• Implemented RDM PIDs:

  • Required PIDs: All (ANSI E1.20-2010)
  • Other PIDs:

    • DEVICE_MODEL_DESCRIPTION
    • MANUFACTURER_LABEL
    • SOFTWARE_VERSION_LABEL
• RDM parameters are stored in non-volatile memory.
• Easy UID programming for mass device production.
• I2C speeds: 100 kHz, 400 kHz, and 1 MHz.