The **M5TS-03-R/Q** is a high-performance, small-form-factor thermal sensor module, typically categorized as a **Thermopile Sensor**. It is widely used in medical, industrial, and consumer electronics for non-contact temperature measurement. Below is a breakdown of its electronic specifications and characteristics. ### 1. General Specifications | Feature | Details | | :--- | :--- | | **Sensor Type** | Thermopile (Infrared Non-contact) | | **Object Temp Range** | Typically -20°C to +100°C (varies by calibration) | | **Operating Voltage** | 3.0V to 5.5V DC | | **Output Type** | Analog voltage (Proportional to IR radiation) | | **Thermistor** | Integrated NTC for ambient temperature compensation | --- ### 2. Core Electronic Components The device functions based on two primary internal sensing elements: 1. **Thermopile Element:** This consists of several thermocouples connected in series. It absorbs infrared energy from the target object and converts it into a small millivolt (mV) electrical signal. 2. **Internal Thermistor:** Since thermopiles measure the *difference* in temperature between the sensor and the object, an internal NTC (Negative Temperature Coefficient) thermistor is included to measure the "Reference" (ambient) temperature of the sensor itself. --- ### 3. Pin Configuration (Typical) The M5TS series usually follows a 4-pin layout to allow for differential signal processing. | Pin Number | Name | Description | | :--- | :--- | :--- | | **1** | **V_obj (+)** | Positive terminal for the Thermopile output | | **2** | **V_obj (-)** | Negative terminal/Common for the Thermopile | | **3** | **V_th** | Reference Thermistor output | | **4** | **GND** | Ground/Common | --- ### 4. Signal Processing Requirements Because the output signal of the M5TS-03-R/Q is a very low analog voltage, the following electronic stages are required in a circuit design: * **Amplification:** An **Instrumentation Amplifier** or a High-Precision Op-Amp is needed to boost the mV signal to a level readable by an ADC (Analog-to-Digital Converter). * **Filtering:** Low-pass filters are essential to remove high-frequency noise and 50/60Hz interference from the environment. * **MCU Compensation:** The microcontroller must run an algorithm that combines the Thermopile voltage and the Thermistor resistance to calculate the final object temperature (Steinhart-Hart equation for the thermistor and a look-up table for the IR output). --- ### 5. Application Areas * **Medical:** Ear/Forehead thermometers. * **Appliances:** Microwave ovens, hair dryers, and toasters. * **Industrial:** Monitoring hotspots in electrical panels or moving machinery parts.