NFC Tag Communication Using Serial Microcontroller Without Dedicated IC
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Solution Overview
Problem
General microprocessors do not have specific circuits for NFC, leading to high costs due to the need for specialized integrated circuits for near-field communication, which are costly.
Innovation Solution
A method using an NFC tag device with an NFC LC resonant circuit, frequency dividing circuit, envelope detecting circuit, and serial interface microcontroller to perform NFC communication without a specific NFC integrated circuit, utilizing a serial interface microcontroller to decode NFC data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific NFC integrated circuit is used to implement NFC communication, then the reliability and performance of NFC communication is improved, but the cost increases significantly
Solution Approach 1:
The patent applies universality by enabling a general-purpose microcontroller to perform NFC communication functions through software implementation rather than requiring a dedicated NFC integrated circuit. The microcontroller's existing resources (CPU, memory, I/O interfaces) are utilized to implement NFC protocol processing, signal modulation/demodulation, and data encryption/decryption, making the NFC functionality accessible across different device types without requiring specialized hardware for each application.
Solution Approach 2:
The patent employs copying by implementing the NFC communication protocol through software code that replicates the functionality of dedicated NFC hardware. The software suite includes protocol state machines, signal processing algorithms, and security management routines that copy the essential functions of a dedicated NFC controller, allowing the microcontroller to emulate NFC behavior without physical NFC-specific circuitry.
2Productivity
If a dedicated NFC integrated circuit is used, then the NFC communication performance is improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by combining multiple functions (NFC protocol processing, signal modulation/demodulation, data encryption/decryption, and communication control) into a single general-purpose microcontroller unit. This consolidation eliminates the need for separate dedicated NFC hardware modules, reducing the overall number of components and interconnections while maintaining comprehensive NFC functionality through integrated software management.
Solution Approach 2:
The microcontroller serves multiple purposes: it handles NFC communication protocols, processes radio frequency signals through software-based modulation and demodulation, manages data encryption and decryption operations, and controls the overall communication sequence. This multi-functional approach replaces what would traditionally require multiple specialized hardware components, simplifying the system architecture.
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
Enables cost-effective NFC communication by decoding NFC data without the need for specialized integrated circuits, reducing costs and utilizing existing microcontroller technology.
Implementation Method 1
NFC LC resonant circuit include a first terminal and a second terminal
Implementation Method 2
The frequency dividing circuit divides an NFC carrier signal from the first terminal of the NFC LC resonant circuit into an NFC clock signal
Implementation Method 3
The envelope detecting circuit converts the received signal into an envelope signal
Data Source
AI summary
A method for near field communication with a serial transmission microcontroller and an NFC tag device using the same are provided in the present invention. The method includes: providing a serial interface microcontroller; capturing an NFC carrier signal from an NFC LC resonant circuit; performing a frequency division to the NFC carrier signal to obtain a NFC clock signal; filtering the NFC carrier signal from the NFC LC resonant circuit to obtain an envelope signal; sequentially receiving a digital sequence of the envelope signal according to triggering of the NFC clock signal based on a serial transmission protocol; and decoding an NFC data from the digital sequence based on an NFC transmission protocol rule.