RFID Tag Memory Access via Digital Interface
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Solution Overview
Problem
Traditional RFID tags primarily access information through an RF interface, limiting their functionality and applications, as there is a growing need to access RFID tag information via digital interfaces for greater versatility and integration with external computing devices.
Innovation Solution
The development of an RFID tag system that allows memory access through a digital interface, featuring a communications interface and power management, enabling interaction with external computing devices and providing power independence from RFID interrogators, with multiple RF network nodes for enhanced functionality, redundancy, and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RFID tag memory is accessed only through RF interface, then traditional RFID functionality is maintained, but versatility and integration with external computing devices is limited
Solution Approach 1:
The RFID tag is designed with multiple communication interfaces including both the traditional RF interface and a digital interface (such as I2C, SPI, or UART). This allows the same RFID tag to serve multiple functions: it can be accessed by RFID readers through the RF interface for wireless communication, and simultaneously accessed by external computing devices through the digital interface for direct data exchange, thereby achieving multi-functionality and increased versatility without requiring separate devices
Solution Approach 2:
The communication interface of the RFID tag is segmented into multiple independent interfaces: the RF interface for wireless RFID communication and the digital interface for wired communication with external computing devices. Each interface operates independently with its own protocol and communication path, allowing the system to maintain traditional RFID functionality while adding new capabilities without interference between interfaces
2Adaptability or versatility
If RFID tag is powered only by RFID interrogator, then power supply is simple, but power independence and operational flexibility is limited
Solution Approach 1:
The power management system is designed to accept multiple power sources: it can be powered by the RFID interrogator through electromagnetic induction (traditional passive RFID power supply), or independently powered by an external computing device through the digital interface. The power management circuit intelligently selects and switches between these power sources, enabling the RFID tag to operate in different modes (passive RFID mode or active mode with external power) and providing greater operational flexibility
Solution Approach 2:
The power management circuit acts as an intermediary between multiple power sources (RFID interrogator and external computing device) and the RFID tag's internal components. It manages power distribution, switches between power sources, and ensures stable power supply to different modules based on operational requirements, thereby enabling power independence while maintaining system simplicity
3Adaptability or versatility
If single RF network node is used, then device structure is simple, but functionality, redundancy and connectivity are limited
Solution Approach 1:
The RFID tag incorporates multiple RF network nodes, each with its own RF interface and communication capabilities. These nodes are segmented and can operate independently or in coordination, allowing the system to establish multiple communication paths simultaneously - one path through the RF interface for RFID communication and another path through the digital interface for direct computing device communication, thereby enhancing connectivity options without creating a monolithic complex structure
Solution Approach 2:
The system can dynamically change operational parameters by activating different RF network nodes based on communication requirements. When RFID wireless communication is needed, the RF interface is activated; when direct digital communication is needed, the digital interface is activated. This parameter switching capability allows the system to adapt to different connectivity scenarios while maintaining a relatively simple overall structure
Data Source
AI summary
In embodiments of the present invention improved capabilities are described for an RFID tag comprising a radio frequency (RF) network node and a communication facility, the RF network node comprising a data processing and controller block for digital information processing, a memory store, and a power management block for managing power requirements of the RFID tag, wherein an external computing device accesses the memory store through a communications bus.