The chip is used in passive UHF read-only transponder applications. It is powered up by an RF beam transmitted by the reader, which is received and rectified to generate a supply voltage for the chip. A pre-programmed code is transmitted to the reader by varying the amount of energy that is reflected back to the reader. It implements a robust and fast anti-collision protocol.
The EM4123 is frequency independent and can be used for RF coupled applications where reading ranges in excess of 10 m and reading rates of 120 tags per second at 256 kbit/s can be attained. The circuit is backscattering data using load modulation. Therefore the reader should be able to detect ASK and PSK modulated carrier.
Benefits
- Anti-collision suited for fast moving objects
- Very low current consumption, long range solution
- Easy to use, only pure CW RFID reader needed (No dense reader mode issue)
- Protocol and coding backward compatible with EM4122 and EM4222
- Low cost solutions
Solutions
The chip is ideal for applications where long range, high-speed item identification is required:
- Supply chain management
- Tracking and tracing
- Access control
- Asset control
- Licensing
- Auto-tolling
- Animal tagging
- Sports event timing
