The **RI-TRP-R9TD** is a high-performance Radio Frequency Identification (RFID) transponder manufactured by Texas Instruments (TI). It belongs to the **TIRIS™** (Texas Instruments Registration and Identification System) product line, specifically utilizing Low Frequency (LF) technology. --- ## 1. Core Technical Specifications The RI-TRP-R9TD is a **Read-Only** transponder designed for harsh environments. | Feature | Specification | | :--- | :--- | | **Operating Frequency** | 134.2 kHz | | **Type** | Passive (Battery-less) | | **Memory Size** | 64-bit (Factory programmed unique ID) | | **Communication Protocol** | FM (Frequency Modulation) | | **Transmission Principle** | FSK (Frequency Shift Keying) | | **Operating Temperature** | -40°C to +85°C | | **Housing Material** | Glass (Cylindrical) | --- ## 2. Electronic Architecture The device functions through a sophisticated integration of passive electronic components housed in a small glass capsule: ### A. The Antenna (Inductive Coil) The transponder contains a micro-coil of copper wire wound around a ferrite core. This coil serves two purposes: 1. **Power Harvesting:** It captures the magnetic field from the RFID reader to charge an internal capacitor. 2. **Data Transmission:** It broadcasts the stored ID signal back to the reader. ### B. The Integrated Circuit (IC) The silicon chip inside manages the power regulation and data modulation. Since it is **Read-Only**, the unique 64-bit identification number is laser-etched during manufacturing and cannot be altered, ensuring high security against duplication or tampering. ### C. The Resonance Capacitor Connected in parallel with the antenna, this capacitor creates an LC resonant circuit tuned precisely to 134.2 kHz. This allows the transponder to achieve maximum energy transfer efficiency. --- ## 3. Key Advantages * **Durability:** The glass encapsulation protects the electronics from moisture, chemicals, and pressure. * **Interference Resistance:** Using 134.2 kHz (LF) allows the signal to penetrate non-metallic materials like wood, plastic, and even liquid/flesh better than higher frequencies. * **Long Life:** With no internal battery, the shelf life is theoretically infinite. --- ## 4. Common Applications * **Animal Identification:** Often used as an injectable tag for livestock or pets (PIT tags). * **Waste Management:** Embedded in bins for automated tracking. * **Access Control:** Used in specialized industrial key fobs. * **Asset Tracking:** Tracking high-value tools or gas cylinders in industrial settings.