Passive RFID IC Tag Voltage Detection for Reliable Data Reading
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Solution Overview
Problem
Passive RFID IC tags face reliability issues due to incorrect data reading caused by power supply voltage fluctuations, which can result in erroneous operations if the voltage falls within a range that allows logic circuit operation but not memory read circuit operation, leading to incorrect data transmission to readers.
Innovation Solution
Incorporating a voltage detecting unit to ensure data reading operations are executed only when the power supply voltage reaches a level sufficient for memory read circuit operation, thereby preventing incorrect data transmission and enhancing data reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the IC tag operates with a power supply voltage generated from radio waves, then the IC tag can function without a battery (passive type), but the power supply voltage may fall within a range that allows logic circuit operation but not memory read circuit operation, causing incorrect data reading
Solution Approach 1:
The voltage detecting unit detects the power supply voltage level before the data reading operation is executed. The control unit uses this preliminary detection result to determine whether to execute the reading operation, preventing incorrect data reading when the voltage is insufficient for memory read circuit operation.
Solution Approach 2:
The voltage detecting unit continuously monitors the power supply voltage and provides feedback to the control unit. Based on this feedback, the control unit dynamically decides whether to execute data reading operations, ensuring that reading only occurs when the voltage is sufficient for reliable memory read circuit operation.
2Productivity
If the IC tag executes data reading operations whenever logic circuits can operate, then reading operations can be performed more frequently, but incorrect data may be read when power supply voltage is insufficient for memory read circuit operation
Solution Approach 1:
Before executing any data reading operation, the system performs preliminary voltage detection using the voltage detecting unit. The control unit checks whether the detected voltage is sufficient for memory read circuit operation, and only executes the reading operation if the voltage threshold is met, preventing incorrect data transmission.
Solution Approach 2:
The control unit receives continuous feedback from the voltage detecting unit about the power supply voltage level. Based on this feedback, the control unit makes informed decisions about whether to execute reading operations, ensuring high productivity while preventing incorrect data transmission through voltage-conditioned operation control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures reliable data reading operations by executing the reading operation only when the power supply voltage is at a level that allows normal memory read operations, preventing wrong data from being sent to the reader and improving overall data reliability.
Implementation Method 1
the IC tag 101 rectifies the received radio waves in the power supply voltage generating circuit 111 to generate a power supply voltage necessary for internal circuits of the IC tag 101 to operate
Data Source
AI summary
To provide a semiconductor device capable of securely executing a reading operation to improve a reliability of read data, an IC tag including the semiconductor device, and a control method for the IC tag. A semiconductor device according to an embodiment of the present invention includes: a power supply voltage generating circuit for generating a power supply voltage based on a received radio signal; a power supply voltage generating circuit for detecting the power supply voltage; a memory area for storing predetermined data; a reading/writing circuit using different operation voltages for reading data from the memory area and writing data to the memory area; and a control circuit for executing a data reading operation for the memory area based on a detected power supply voltage.