## Overview of FR02FR10P-R The **FR02FR10P-R** is a high-quality, subminiature rotary coded switch manufactured by **NKK Switches**. It belongs to the **FR02 series**, which is characterized by its compact size and surface-mount (SMD) design, making it ideal for high-density circuit boards. --- ### Technical Specifications The following table outlines the primary electrical and mechanical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Switch Type** | Rotary Coded Switch | | **Output Code** | Binary Coded Decimal (BCD) | | **Number of Positions** | 10 Positions (0-9) | | **Mounting Type** | Surface Mount (SMD / Gull-wing) | | **Actuator Style** | Screwdriver Slotted (Flat) | | **Voltage Rating** | 5V DC (Switching) / 50V DC (Non-switching) | | **Current Rating** | 100mA (Switching) / 100mA (Non-switching) | | **Terminal Pitch** | 2.54mm (0.100") | | **Operating Temp** | -25°C to +85°C | --- ### Key Features and Construction 1. **Compact Dimensions**: Measuring approximately 10mm x 10mm, it is designed to save board space. 2. **Highly Visible Legends**: The dial features high-contrast printed numbers for easy identification of the current setting. 3. **Gold-Plated Contacts**: The internal contacts are gold-plated to ensure high reliability, prevent oxidation, and provide low contact resistance. 4. **Heat Resistant Resin**: The housing is made of heat-resistant glass-fiber reinforced polyamide, allowing it to withstand infrared (IR) reflow soldering processes. 5. **Washable Construction**: It is designed with a boot-sealed construction (IP65 rated equivalent) that allows for automated soldering and cleaning processes. --- ### Terminal Configuration (Logic Table) As a BCD (Binary Coded Decimal) switch, the device has 4 output pins (representing bits 1, 2, 4, and 8) and a common pin (C). The connection logic is as follows: | Position | C to 1 | C to 2 | C to 4 | C to 8 | | :---: | :---: | :---: | :---: | :---: | | **0** | | | | | | **1** | ● | | | | | **2** | | ● | | | | **3** | ● | ● | | | | **4** | | | ● | | | **5** | ● | | ● | | | **6** | | ● | ● | | | **7** | ● | ● | ● | | | **8** | | | | ● | | **9** | ● | | | ● | *(● indicates a closed electrical circuit between Common and the numbered terminal)* --- ### Common Applications * **Address Setting**: Configuring ID numbers for devices on a network (e.g., RS-485 or CAN bus). * **Mode Selection**: Switching between different operational modes in industrial controllers. * **PCB Prototyping**: Allowing manual configuration of hardware parameters without needing a software interface. * **Security Systems**: Setting manual codes for control panels.