DMX to Addressable LED Controller Chip – IS3751

Description

The IS3751 is a DMX512-to-addressable-LED protocol converter chip. It operates fully autonomously, requiring no microcontroller or processor, thereby reducing engineering costs and accelerating the product’s time-to-market.

It can control up to 170 3‑color or 128 4-color addressable LEDs at a refresh rate of 40 Hz.

An RS485 receiver or transceiver converts the DMX differential signaling to TTL-compatible levels for the IS3751, which then directly generates data stream for the addressable LEDs.

The chip includes a pin for selecting between 3-color and 4-color addressable LEDs, and a blinking indicator pin to show when a DMX signal is present.

The device operates at 3.3 V, with 5 V-tolerant open‑collector LEDs control pin and with 5 V-tolerant RX pin for DMX input, allowing compatibility with both 3.3 V and 5 V RS485 receivers or transceivers.

Using 3-color addressable LED:

When controlling 3‑color addressable LED, the chip groups every 3 DMX channels into one LED. For example, channel 1, 2 and 3 control the colors of the first LED; channels 4, 5 and 6 control the second LED, and so on, up to LED 170. 

Using 4-color addressable LED:

When controlling 4‑color addressable LED, the chip groups every four DMX channels into one LED. For example, channels 1, 2, 3 and 4 control the 4 colors of the first LED; channels 5, 6, 7 and 8 control the second LED, and so on, up to LED 128.

How to Use

The IS3751 is very easy and straightforward to use and does not require an external microcontroller: 

1. Place an RS485 receiver or transceiver between the DMX connector and the IS3751 RX pin. 
2. Add a pull-up resistor of 500 Ω to 5 V on IS3751 LEDS pin, and connect this pin to the addressable LEDs. 
3. Connect the TYPE pin to GND for 3‑color LEDs, or to 3.3 V for 4‑color LEDs. 

Ready. Once powered, the IS3751 automatically starts converting DMX data to addressable LED data.

Applications

• Custom Lighting
• LED Strips, Panels and Bars
• Floodlights and Wall Washers
• Building Facades, Bridges and Monuments
• Interior Design Lighting
• Water Fountains
• Museum Lighting
• Stage and Entertainment Lighting
• Digital Art Installations
• Animatronics
• OEM / Device Manufacturers

Benefits

• Autonomous operation, no need of microcontroller
• Reduces engineering time and costs
• Reduces product time-to-market
• Provides a low-cost solution
• Compact, easy-to-solder SO8N package