The **CFAG1602A-RFD-JP** is a character Liquid Crystal Display (LCD) module manufactured by Crystalfontz. It is designed to display 16 characters across 2 lines. Below is a breakdown of its electronic specifications and technical features. --- ### 1. General Specifications | Feature | Description | | :--- | :--- | | **Display Format** | 16 Characters x 2 Lines | | **Technology** | FSTN (Film-compensated Super-Twisted Nematic) | | **Backlight** | Red LED (indicated by "R" in the part number) | | **Polarizer Mode** | Transflective (visible with or without backlight) | | **Interface** | Parallel (8-bit or 4-bit) | | **Controller** | Sitronix ST7066U (or compatible) | --- ### 2. Pinout Configuration This module typically uses a standard 16-pin interface. | Pin No. | Symbol | Function | | :--- | :--- | :--- | | 1 | VSS | Ground (0V) | | 2 | VDD | Supply Voltage for Logic (+5V or +3.3V) | | 3 | VO | Contrast Adjustment (via Potentiometer) | | 4 | RS | Register Select (High: Data / Low: Instruction) | | 5 | R/W | Read/Write (High: Read / Low: Write) | | 6 | E | Enable Signal | | 7-14 | DB0-DB7 | Data Bus lines | | 15 | LED+ | Backlight Anode (+) | | 16 | LED- | Backlight Cathode (-) | --- ### 3. Electrical Characteristics To prevent damaging the electronic components, the following parameters should be observed: * **Supply Voltage ($V_{DD}$):** Typically 5.0V (Standard) or 3.3V depending on the specific version. * **Backlight Forward Voltage ($V_f$):** Usually ~2.1V for Red LEDs. A current-limiting resistor is **required**. * **Operating Current ($I_{DD}$):** Approximately 1.5mA to 2.5mA (excluding backlight). * **Input High Voltage:** $0.7 \times V_{DD}$ (Minimum). --- ### 4. Logic & Programming The onboard controller (ST7066U) is industry-standard, making it compatible with many libraries (like the Arduino `LiquidCrystal` library). #### Initialization Code Snippet (Example) ```cpp #include // Initialize the library with the numbers of the interface pins // RS, E, D4, D5, D6, D7 LiquidCrystal lcd(12, 11, 5, 4, 3, 2); void setup() { lcd.begin(16, 2); // Set up the LCD's number of columns and rows lcd.print("CFAG1602A Ready"); } void loop() { // Main logic } ``` ---