This repository contains the schematic and implementation guidelines for the IS3715, a specialized integrated circuit designed to generate a compliant DMX512-A signal directly from an I2C interface.
- Product Page: I2C DMX Controller IS3715
- Datasheet: IS3715 Technical Specifications (ISDOC143)
The IS3715 acts as a dedicated DMX controller, offloading the rigorous timing requirements of the MbB and MaB of the DMX512 protocol from the your microcontroller:
- Autonomous Transmission: Once channel values are written to the internal 512-byte RAM via I2C, the chip continuously broadcasts the DMX universe at a rock-solid 44 Hz refresh rate.
- Glitch Recovery: Because the chip constantly refreshes the DMX line, any signal interruptions or noise-induced glitches are automatically corrected in the next frame without host intervention.
- Hardware Synchronization: Includes a dedicated SYNC output pin that pulses high for 100 µs at the start of each DMX Break, allowing for perfect synchronization of multiple universes.
- Resource Optimization: Eliminates the need for high-priority UART interrupts and complex timer configurations on your microcontroller.
To accelerate your development, the following evaluation boards are available with built-in RS485 transceivers and test sliders:
- For Raspberry Pi: Kappa3715Rasp
- HAT form factor with 3x onboard sliders for immediate DMX testing.
- Simplifies DMX generation on Linux, where real-time UART timing is often unstable.
- For Arduino / STM32: Kappa3715Ard
- Standard Arduino Shield form factor.
- Features 3x sliders connected to analog inputs (A1-A3) for easy "fader-to-DMX" prototyping.
For technical support or hardware design review, please visit inacks.com.