The **M5R84XHJ-R** is an alphanumeric liquid crystal display (LCD) module. These components are widely used in embedded systems, industrial equipment, and DIY electronics for providing visual data feedback. Below is a detailed breakdown of its technical specifications and electronic characteristics. --- ### 1. General Specifications The M5R84XHJ-R typically follows the industry-standard character LCD architecture (similar to the common 16x2 or 20x4 formats). | Feature | Specification | | :--- | :--- | | **Display Type** | STN (Super-Twisted Nematic) Alphanumeric | | **Format** | Character-based (typically 16 columns x 2 rows) | | **Backlight** | LED (Yellow-Green or White) | | **Controller** | HD44780 or equivalent (e.g., ST7066) | | **Interface** | 4-bit or 8-bit Parallel | | **Operating Voltage** | 4.5V to 5.5V (Standard 5V) | --- ### 2. Pinout Configuration This module usually features a standard 16-pin interface. Understanding the pinout is crucial for wiring it to a microcontroller like an Arduino or STM32. | Pin | Symbol | Function | | :--- | :--- | :--- | | 1 | **VSS** | Ground (0V) | | 2 | **VDD** | Power Supply (+5V) | | 3 | **VO** | Contrast Adjustment (via Potentiometer) | | 4 | **RS** | Register Select (Instruction / Data) | | 5 | **R/W** | Read / Write Select | | 6 | **E** | Enable Signal | | 7-14 | **D0-D7** | Data Bus (8-bit) | | 15 | **A / LED+** | Backlight Anode (+) | | 16 | **K / LED-** | Backlight Cathode (-) | --- ### 3. Electronic Characteristics #### Logic Interface The device operates on **TTL-level logic**. * **High (Logic 1):** 2.2V to VDD * **Low (Logic 0):** -0.3V to 0.6V #### Current Consumption * **Logic (IDD):** ~1.5mA to 3.0mA. * **Backlight:** ~100mA to 150mA (Requires a current-limiting resistor if not built-in). #### Contrast Control The **VO pin (Pin 3)** is sensitive. Applying a voltage between 0V and 0.5V usually yields the best visibility. This is typically achieved using a 10kΩ potentiometer connected between VDD and VSS. --- ### 4. Basic Connection Logic (Code Example) To drive this part using a microcontroller in 4-bit mode, you only need 6 GPIO pins (RS, E, D4, D5, D6, D7). ```cpp // Example for Arduino using LiquidCrystal library #include // initialize the library with the numbers of the interface pins const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; LiquidCrystal lcd(rs, en, d4, d5, d6, d7); void setup() { lcd.begin(16, 2); // Set columns and rows lcd.print("System Ready"); } void loop() { // Main logic } ``` ---