The **DMS-20PC-1-PGL-C** is a high-performance, 3.5-digit digital voltmeter (DVM) module manufactured by Murata Power Solutions. It is part of the DMS-20PC series, known for its subminiature size and high reliability. --- ### ## Technical Specifications The following table outlines the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Display Type** | 3.5 Digit LED (0.37" / 9.4mm height) | | **Display Color** | Large-Intensity Green (Low Power) | | **Input Range** | ±2V (DC) | | **Power Supply** | +5V DC (±5%) | | **Input Impedance** | 1,000 MΩ (Minimum) | | **Operating Current** | ~10mA (Low Power Model) | | **Sampling Rate** | 2.5 samples per second | | **Operating Temp** | 0°C to +60°C | --- ### ### Key Electronic Components & Features 1. **Integrated A/D Converter:** The heart of the module is a high-precision, dual-slope integrating Analog-to-Digital Converter. This provides excellent noise rejection (especially at 50/60Hz) and stable readings. 2. **Internal Reference:** It includes a built-in temperature-compensated voltage reference, ensuring accuracy over its operating temperature range without requiring frequent recalibration. 3. **Low-Power LED Circuitry:** The "PGL" suffix indicates a **Power-Green, Low-power** display. Unlike standard LEDs, these use high-efficiency Gallium Phosphide (GaP) technology to provide bright visibility while drawing minimal current (typically around 10-15mA). 4. **Auto-Polarity & Overrange Indication:** The circuitry automatically detects and displays negative signs ("-"). If the input exceeds the 1.999V limit, the display flashes or shows a specific "1" digit to indicate an overrange condition. --- ### ### Pinout and Connectivity The module is designed for PCB mounting with a standard 12-pin layout: * **V+ (Pin 1):** +5V Power Supply input. * **GND (Pin 12):** Power Supply Ground. * **(+) Input (Pin 11):** Positive Analog Input. * **(-) Input (Pin 10):** Negative Analog Input (Reference). * **Decimal Point Select (Pins 4, 5, 6):** Can be tied to ground to activate specific decimal points (1.999, 19.99, or 199.9). --- ### ### Common Applications * **Precision Test Equipment:** Benchtop power supplies and multimeters. * **Industrial Monitoring:** Real-time voltage tracking in control panels. * **Battery Management:** Monitoring discharge levels in 5V-compatible systems.