The **CD10CM0CB-R** is a specific electronic component belonging to the **Rotary Dual-In-Line (DIP) Switch** category, manufactured by **C&K** (now part of Littelfuse). These components are widely used for setting binary or hexadecimal values on printed circuit boards (PCBs). --- ## 1. Component Overview The CD10CM0CB-R is a subminiature rotary coded switch. Unlike a standard toggle switch, it allows a user to select a specific numeric or hexadecimal output by rotating a central dial. ### Key Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | C&K (Littelfuse) | | **Circuit Type** | BCD (Binary Coded Decimal) | | **Number of Positions** | 10 (0 through 9) | | **Mounting Type** | Surface Mount (SMT), Gull Wing | | **Actuator Type** | Flush, Screwdriver slot | | **Contact Rating** | 0.4VA @ 20V AC/DC | | **Operating Temp** | -25°C to 85°C | --- ## 2. Technical Breakdown ### A. Output Configuration: BCD The "CD10" in the part number indicates it is a **10-position Binary Coded Decimal** switch. - When the dial is turned to a number (e.g., "3"), the internal contacts close to represent that number in 4-bit binary. - This is useful for microcontrollers to read a manual setting using only 4 input pins. ### B. Mechanical Design - **Subminiature Size:** Designed for high-density PCBs where space is at a premium. - **Process Sealed:** The "R" at the end usually denotes tape and reel packaging, and the series is typically sealed to withstand soldering and cleaning processes (washable). - **Actuation:** It features a flush actuator, meaning it is adjusted using a small flat-head screwdriver rather than a protruding knob. ### C. Termination Style - **Gull Wing:** The leads curve outward (like a seagull's wing), making it suitable for standard automated SMT (Surface Mount Technology) pick-and-place assembly. --- ## 3. Applications These switches are commonly found in industrial and consumer electronics for: 1. **Address Setting:** Assigning a unique ID to a device on a bus (e.g., RS-485 or CAN bus). 2. **Configuration:** Selecting operating modes without needing a digital interface or screen. 3. **Timers/Counters:** Setting manual threshold values for hardware-based timers. --- ## 4. Pinout Logic (Example) Since it is a 10-position BCD switch, the logic follows this truth table for the output pins (1, 2, 4, 8): | Position | Pin 8 | Pin 4 | Pin 2 | Pin 1 | | :---: | :---: | :---: | :---: | :---: | | 0 | Low | Low | Low | Low | | 1 | Low | Low | Low | **High** | | 5 | Low | **High** | Low | **High** | | 9 | **High** | Low | Low | **High** |