Based on the technical specifications for the **CRE16-ROTM1AR**, this part is a **Rotary Coded Switch** (specifically a Binary Coded Decimal or Hexadecimal selector) manufactured by components suppliers like Nidec Components (formerly Copal Electronics) or similar specialized manufacturers. --- ### ## Technical Overview The CRE16-ROTM1AR is a high-reliability, surface-mount (SMD) rotary switch used to set parameters on a circuit board manually. ### ### 1. Key Specifications | Feature | Description | | :--- | :--- | | **Part Number** | CRE16-ROTM1AR | | **Number of Positions** | 16 (Hexadecimal) | | **Coding Type** | Real Code (Binary Coded Decimal/Hex) | | **Mounting Type** | Surface Mount (SMD / Gull-wing) | | **Actuator Style** | Rotary for Tool (Recessed Arrow) | | **Terminal Finish** | Gold Plated (for high reliability) | | **Packaging** | Tape and Reel (indicated by the 'R' suffix) | --- ### ### 2. Electronic Functionality The device acts as a digital encoder. Depending on the position of the rotor (0 through F), it closes specific internal circuits to output a 4-bit binary signal. * **Binary Output:** It typically has 5 pins (1 Common, and 4 for bits $2^0, 2^1, 2^2, 2^3$). * **Logic:** When set to "1", only the $2^0$ pin is connected to the Common pin. When set to "F" (15), all four output pins are connected to Common. ### ### 3. Mechanical & Environmental Features * **Sealing:** These units are usually **washable**. They feature an O-ring or sealed construction to withstand solder reflow and subsequent board washing processes. * **Compact Size:** Designed for high-density PCB layouts, usually measuring around 7mm x 7mm. * **Durability:** Rated for thousands of detent steps, though they are intended for "set and forget" configuration rather than frequent user interaction. --- ### ### 4. Common Applications These switches are used in industrial and professional electronics where manual configuration is required: 1. **Address Setting:** Setting the unique ID for a device on a bus (like RS-485 or CAN bus). 2. **Mode Selection:** Choosing between different operating modes (e.g., Test Mode vs. Normal Mode). 3. **Baud Rate Configuration:** Manually selecting communication speeds on industrial controllers. --- ### ### 5. Equivalent Pinout Diagram (Typical) ```text [ 2 ] [ C ] [ 8 ] | | | +-------------+ | ( O ) | <-- Rotary Actuator +-------------+ | | | [ 1 ] [ C ] [ 4 ] ``` *(Note: C = Common Pin; 1, 2, 4, 8 = Binary Weight Pins)*