Designed for cost-effective micro-displays, the NuMicro® M3334 HMI solution targets small-to-medium screens. Using the NuMaker-M3334KI and NuFun-M3334KI boards, this reference design showcases a lightweight 320 × 240 SPI screen HMI. Alongside mainstream emWin and LVGL, it supports the open-source SGL (Simple Graphics Library) with complete examples, enabling developers to build smooth, intuitive GUIs even on resource-constrained hardware.

Additionally, its rich peripherals (I²C, I3C, LLSI, SPI) easily connect various sensors. This makes the M3334 ideal for smart home appliances (e.g., rice cookers, microwaves) and industrial applications like lightweight dashboards and machinery control panels.

• Feature
  

  -	GUI Library
  -	emWin, LVGL, SGL
  -	NuFun-M3334 Evaluation Board
  -	Resolution 320 × 240 SPI TFT-LCD
  -	I3C pressure sensor
  -	I²C temperature sensor and 3-axis sensor
  -	ARGB LED, Encoder, SD card, etc.

• Specifications

  M3334 (32-bit Arm® Cortex®-M33)
  -	Operating Frequency: 180 MHz
  -	Operating Voltage: 1.75 V to 3.6 V
  -	Memory: 512 KB Flash memory / 320 KB SRAM
  -	Package: QFN-33/48, LQFP-48/64/128
  -	Peripherals: I3C, USB HS, CAN FD, LLSI, ELLSI, UART, I²C, SPI, EBI

• System Block Diagram

In response to the growing trend of smart electronic products, Nuvoton provides the NuMicro® MCU platform, which accommodates various size and resolution requirements—ranging from 2.4-inch screens for small home appliances and handheld instruments, to 5-inch displays for medical and industrial equipment, and even larger screens.

Combined with a rich GUI ecosystem that includes SEGGER emWin, LVGL, Qt for MCU, and the lightweight open-source SGL library, the platform empowers customers to seamlessly upgrade TFT-LCD display and interactive functions on their existing systems, significantly lowering development barriers and accelerating time-to-market.