The **LMS-R001-5.0** refers to a high-precision **Current Sense Resistor** (specifically a Metal Strip Shunt Resistor). These components are designed to measure current flow by creating a very small voltage drop that can be measured by a microcontroller or amplifier. --- ### 1. Key Technical Specifications Based on the part number nomenclature, here are the primary electronic characteristics: | Parameter | Value / Description | | :--- | :--- | | **Resistance Value** | 1.0 mΩ (0.001 Ohms) | | **Power Rating** | 5.0 Watts | | **Tolerance** | Typically ±1% (Standard for this series) | | **Temperature Coefficient** | Low TCR (often < 50 ppm/°C) | | **Construction** | Metal Alloy Plate / Surface Mount (SMD) | --- ### 2. Breakdown of the Part Number * **LMS:** Manufacturer series code (often associated with brands like Isabellenhütte or similar high-precision shunt manufacturers). * **R001:** The resistance value using "R" as the decimal point. $R001 = 0.001$ Ohms. * **5.0:** Represents the Power Rating ($P = I^2 \times R$), indicating it can dissipate up to 5 Watts of heat. --- ### 3. Electronic Functionality This part operates on **Ohm's Law ($V = I \times R$)**. Because the resistance is extremely low (1 milliohm), it allows high currents to pass through with minimal power loss while providing a signal. #### Typical Use Cases: 1. **Current Monitoring:** Placed in series with a load to monitor battery discharge or motor current. 2. **Over-current Protection:** Used in power supplies to trigger a shutdown if current exceeds safe limits. 3. **Battery Management Systems (BMS):** Measuring state-of-charge (SoC) by tracking current entering/leaving a battery pack. --- ### 4. Implementation Example If you pass **50 Amps** through this resistor, the voltage drop produced would be: `V = 50A × 0.001Ω = 0.050V (50mV)` ```cpp // Example: Calculating current from ADC reading float resistance = 0.001; // 1mOhm float voltageDrop = readADC(); // Measure voltage across resistor float current = voltageDrop / resistance; ```