The **W2TS-31A-R/CE** is a high-precision digital temperature sensor commonly used in industrial automation and climate control systems. It is characterized by its compact design and reliable communication protocol. --- ### ## Technical Specifications Overview The following table summarizes the core electronic and physical attributes of the device: | Feature | Specification | | :--- | :--- | | **Sensor Type** | Digital Temperature Sensor | | **Interface** | 1-Wire (Serial Communication) | | **Voltage Supply** | 3.0V to 5.5V DC | | **Operating Range** | -55°C to +125°C | | **Accuracy** | ±0.5°C (from -10°C to +85°C) | | **Resolution** | 9 to 12 bits (user-programmable) | | **Certification** | CE Marked (Complies with EU health, safety, and environmental standards) | --- ### ## Internal Component Breakdown #### 1. Sensing Element The core component is a **band-gap temperature sensor**. Unlike traditional thermistors that change resistance, this electronic part uses the temperature-dependent voltage characteristics of semiconductor junctions to provide a highly linear output. #### 2. Analog-to-Digital Converter (ADC) The unit contains an internal **Sigma-Delta ADC**. This converts the analog voltage from the sensing element into a digital value. Because the conversion happens inside the sensor housing, it is highly resistant to electrical noise compared to analog sensors. #### 3. 64-Bit ROM Each W2TS-31A-R/CE unit contains a unique **64-bit lasered ROM code**. This allows multiple sensors to exist on the same data line (bus), as each can be addressed individually by a microcontroller. #### 4. Non-Volatile Memory (EEPROM) The chip includes internal EEPROM to store: * **Alarm Triggers:** High and low threshold settings. * **Configuration:** Resolution settings that persist even after power loss. --- ### ## Wiring and Connectivity The "R/CE" designation typically refers to specific connector types or lead lengths. Standard wiring follows this logic: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Red** | VDD | Power supply (3V - 5.5V) | | **Black/Blue** | GND | Ground connection | | **Yellow/White** | DQ | Data Input/Output (requires a pull-up resistor) | --- ### ## Key Features * **Parasitic Power Mode:** The sensor can derive power directly from the data line (DQ), requiring only two wires (DQ and GND) for operation. * **Ruggedized Housing:** The "W" prefix often denotes a waterproof or weather-resistant stainless steel probe housing, protecting the internal electronics from moisture and corrosion. * **CE Compliance:** Ensures low electromagnetic emissions and high immunity to external interference.