The **TOM-3050L-R** is a standard electronic display component, specifically a **7-segment LED dot matrix display**. It is commonly used in industrial panels, elevators, and digital clocks where numerical or basic character information needs to be displayed clearly. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics of the TOM-3050L-R: | Parameter | Specification | | :--- | :--- | | **Component Type** | 5x7 Dot Matrix Display | | **Dot Diameter** | 3.0 mm | | **Display Color** | Red (High Efficiency) | | **Circuit Configuration** | Column Cathode / Row Anode (or vice versa depending on suffix) | | **Peak Forward Current** | 100 mA (per dot) | | **Forward Voltage ($V_F$)** | 1.8V to 2.2V typical | | **Luminous Intensity** | ~15 mcd | | **Operating Temperature** | -25°C to +85°C | --- ## 2. Key Internal Components The device is comprised of three main layers: ### A. The LED Dice The heart of the component consists of **Gallium Arsenide Phosphide (GaAsP)** or similar semiconductor material. There are 35 individual LED "dots" arranged in a 5-column by 7-row grid. ### B. The Package (Housing) * **Reflector Cap:** A plastic housing designed to direct the light from the LEDs through the circular apertures. * **Epoxy Resin:** The dots are filled with a diffused epoxy to ensure uniform light distribution and protect the internal bonding wires. ### C. Pinout Structure The component uses a **Dual In-Line (DIP)** pin configuration. * **Rows:** Connected to one polarity (Anode or Cathode). * **Columns:** Connected to the opposite polarity. * **Multiplexing:** To control all 35 dots using fewer than 35 pins, the device relies on a grid-addressing system. --- ## 3. Implementation Example To drive this component using a microcontroller (like an Arduino), you would typically use a **Shift Register** (e.g., 74HC595) or a dedicated **LED Driver** (e.g., MAX7219) to manage the multiplexing. ```cpp // Example: Logic for lighting a single dot at Row 1, Column 1 void setup() { pinMode(row1, OUTPUT); pinMode(col1, OUTPUT); } void loop() { digitalWrite(row1, HIGH); // Set Anode High digitalWrite(col1, LOW); // Set Cathode Low to complete circuit } ``` --- ## 4. Common Applications 1. **Industrial Controllers:** Displaying error codes or temperature values. 2. **Elevator Indicators:** Showing floor numbers and directional arrows. 3. **Electronic Signage:** Scrolling text displays (when multiple units are tiled together).