Introduction

ARGB (Addressable RGB) is an upgraded version of traditional RGB technology. Unlike traditional RGB, ARGB adds an independent control IC to each LED, allowing each LED to be programmed individually to create more diverse lighting effects.

WS2812B is a smart external control LED source that integrates control and lighting circuits. It shares the same physical form as the 5050 LED, where each component acts as a pixel. Each pixel contains an intelligent digital interface, data latch, signal shaping, and driving circuits. It also includes a high-precision internal oscillator and programmable constant current control to ensure color consistency across each pixel.

The data protocol uses a single-wire, zero-code communication method. After powering on and resetting, the DIN pin receives data from the controller. The first 24-bit data is transmitted to the first pixel, which extracts it and stores it in its internal latch. The internal shaping circuit processes the remaining data, amplifies it, and forwards it through the DO pin to the next cascaded pixel. The signal decreases by 24 bits with each pixel.

Nuvoton NUC126x Series Products

The NuMicro® NUC126x series is based on the Arm^® Cortex^®-M23 core and supports the Arm^®v8-M instruction set (including division instructions), with a maximum clock frequency of 72 MHz. It features a built-in LED Light Strip Interface (LLSI) and a 48 MHz high-speed oscillator, eliminating the need for external crystal oscillators for the USB 2.0 full-speed peripheral interface. The series operates within a wide voltage range of 2.5V to 5.5V and supports an industrial temperature range of -40°C to 105°C.

NUC1262 Series Selection Table

NUC1263 Series Selection Table

Features of the Nuvoton NUC126x Series for ARGB Control

1. LLSI Interface Simplifies ARGB Control Logic
   The LLSI (LED Light Strip Interface) is a built-in LED control interface in the NUC126x series. It offers the following advantages:
2. a) Precise control of logic at high and low levels;
3. b) Hardware-driven logic transitions;
4. c) Works with PDMA to enhance MCU performance;
5. d) More efficient than SPI-based approaches, saving RAM space.

Internal Logic of the LLSI Interface

2. Supports 2.5V to 5.5V Power Supply
   Since the WS2812 operates with a power supply range of +3.5V to +5.3V, the NUC126x series supports a 2.5V to 5.5V power supply range for easier integration.

WS2812 Maximum Rated Values

3. Multiple ARGB Lighting Examples
   The NUC126x series offers a variety of ARGB lighting examples, such as breathing lights and running lights, simplifying user program design.

Host Demonstration Software

4. Rich Interfaces for ARGB Lighting Control Applications
5. a) The NUC1262 series supports a 10-channel LLSI interface, a 24-channel PWM interface, and 1 USB 2.0 FS device interface.
6. b) The NUC1263 series supports a 6-channel LLSI interface, a 24-channel PWM interface, 1 USB 2.0 FS device interface, and 2 I3C slave interfaces.

NUC1262 ARGB Lighting Control Block Diagram