The **KWMS2-4B-R/Q** is a specific type of alphanumeric or segment-based LED display module, typically used in embedded systems, industrial panels, and consumer electronics to display status or numerical data. ### 1. Component Overview The model number breaks down into specific technical characteristics regarding its size, color, and internal wiring configuration. | Feature | Specification | | :--- | :--- | | **Component Type** | LED Numeric/Alphanumeric Display | | **Digits/Units** | 2-Digit (Common for 'MS2' series) | | **Color** | Red (Indicated by 'R') | | **Polarity** | Common Anode or Common Cathode (Specified by Q) | | **Surface Finish** | Typically Black face with White segments | --- ### 2. Key Electronic Characteristics To integrate this part into a circuit, the following electronic parameters are standard for the KWMS series: * **Forward Voltage ($V_f$):** Typically **1.8V to 2.2V** per segment for Red LEDs. * **Forward Current ($I_f$):** Standard operating current is **10mA - 20mA** per segment. * **Peak Current:** Can handle up to 50mA-100mA for short pulses (multiplexing). * **Wavelength:** Red LEDs usually peak at **630nm - 660nm**. * **Power Dissipation:** Approximately 40mW to 60mW per segment. --- ### 3. Pin Configuration & Wiring The "4B" and "Q" designations often refer to the pinout arrangement and the internal electrical logic. #### Internal Circuitry * **Common Anode (CA):** All the positive terminals of the LEDs are connected together to the VCC. To turn a segment on, the specific cathode pin must be pulled LOW (Ground). * **Common Cathode (CC):** All the negative terminals are connected to Ground. To turn a segment on, the specific anode pin must be pulled HIGH (VCC). #### Interface Example (Microcontroller Connection) To prevent burning out the LEDs, series resistors must be used. ```cpp // Basic Calculation for Current Limiting Resistor // R = (V_supply - V_forward) / I_desired // Example for 5V supply: // R = (5V - 2.0V) / 0.015A = 200 Ohms ``` --- ### 4. Common Applications * **Household Appliances:** Microwave timers, oven temperature displays. * **Industrial Meters:** Digital voltmeters, pressure gauges. * **Clock Modules:** Simple digital timepieces.