The TJC 3.5″ HMI Serial TFT LCD (typically from the TJC4832T series) is an all-in-one smart display solution designed for smooth human-machine interaction. Instead of spending weeks programming pixel coordinates and buffering complex images on your microcontroller, you can design your complete UI layout (buttons, progress bars, sliders, gauges) inside the PC-based USART HMI software.
Once your layout is uploaded to the display via an SD card or serial programmer, your microcontroller interacts with it using simple, high-level serial text strings over a standard TTL UART interface.
Key Features
Dedicated Smart Architecture: Onboard processor and flash memory handle all the graphic rendering, touch responses, and custom font sets.
4-Wire Serial Interface: Simplifies your hardware wiring down to just 4 pins: VCC, GND, TX, and RX. No complex SPI pin management required.
Dual Upload Methods: Flash your UI configurations directly through a USB-to-TTL serial converter or via a FAT32-formatted MicroSD card.
Adjustable Backlight: Supports 100-level software dimming to manage power consumption and display thermals inside enclosed project boxes.
High-Contrast 16-Bit RGB: Displays up to 65K true-to-life colors for sharp text overlays and beautiful graphical widgets.
Technical Specifications
Feature
Specification
Screen Size
3.5 Inch Diagonal
Resolution
480 x 320 Pixels
Touchscreen Type
4-Wire Precision Resistive Touch
Color Depth
16-bit RGB (65,536 Colors)
Communication Interface
TTL Serial / UART (TX/RX)
Operating Voltage
4.75V to 6.5V DC (Ideal: 5V)
Working Current
~100mA to 200mA (Backlight peak)
Onboard Flash Memory
4 MB to 8 MB (Depending on specific batch code)
Expansion Slot
Onboard MicroSD Card Slot (FAT32 format)
Weight
350 g
Dimensions
15 × 10 × 5 cm
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