The **CD16RM0CK-R** is a specific model of a **Rotary Coded Switch** manufactured by **C&K** (a brand under Littelfuse). These switches are commonly used on printed circuit boards (PCBs) to set configuration parameters, such as device addresses or operating modes. --- ## 1. Technical Specifications The part number breakdown reveals the core technical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Manufacturer** | C&K / Littelfuse | | **Actuator Type** | Flush, Screwdriver Slot | | **Number of Positions** | 16 (Hexadecimal) | | **Output Code** | Real Binary Coded Hexadecimal (BCH) | | **Mounting Type** | Surface Mount (SMT), Right Angle | | **Contact Rating** | 0.4 VA @ 20V AC/DC | | **Operating Temp** | -25°C to 85°C | | **Process Sealed** | Yes (Washable) | --- ## 2. Key Internal Components ### A. The Rotor and Stator The device consists of a rotating disc (rotor) with conductive traces and a fixed base (stator). As you turn the screwdriver slot, the rotor bridges specific electrical paths on the stator to create a binary output. ### B. Coding Logic (Hexadecimal) Because this is a **16-position** switch, it outputs a 4-bit binary signal representing values from 0 to F (0 to 15). * **Position 0:** All output pins (1, 2, 4, 8) are open. * **Position F:** All output pins (1, 2, 4, 8) are connected to the common pin. ### C. Contacts and Plating The contacts are typically **gold-plated**. This is crucial for low-voltage applications (0.4 VA rating) to ensure signal integrity and prevent oxidation over the lifespan of the device (usually rated for ~20,000 steps). --- ## 3. Physical Footprint and Design The "R" in the suffix usually denotes **Right Angle** orientation. This means the adjustment dial faces the edge of the PCB rather than the top, making it accessible from the side of a device enclosure. ```text Pin Configuration (Bottom View Concept): [ C ] <- Common Terminal [ 1 ] [ 2 ] [ 4 ] [ 8 ] <- Binary Weighted Terminals ``` --- ## 4. Common Applications * **Industrial Controls:** Setting Modbus or CAN bus node IDs. * **Telecommunications:** Configuring rack-mounted hardware. * **Embedded Systems:** Selecting boot modes or hardware presets without needing a digital interface/display. ---