Single-Wire Data Link Using Transistor Switching and Clock Recovery
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Solution Overview
Problem
Conventional single-wire bidirectional data communication systems have a complex circuit configuration, leading to increased circuit scale due to the need for A/D and D/A converters and timer circuits, making it difficult to reduce the overall circuit size.
Innovation Solution
A data communication system with a master-side and slave-side apparatus configured for bidirectional communication via a single-wire communication line, utilizing transistors, resistors, and connection breaking circuits to efficiently transmit and receive data, reducing the circuit scale by simplifying the communication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional single-wire bidirectional communication techniques using A/D and D/A conversion or time clocking are employed, then bidirectional communication functionality is achieved, but the circuit scale increases due to the need for A/D converters, D/A converters, or timer circuits
Solution Approach 1:
The patent extracts and eliminates the A/D converter, D/A converter, and timer circuit from the conventional bidirectional communication system. Instead of using these complex components, the invention uses a simplified transistor-based switching mechanism that directly controls signal levels on the single-wire communication line, thereby achieving bidirectional communication without increasing circuit scale
Solution Approach 2:
The patent replaces the conventional electronic components (A/D converter, D/A converter, timer circuit) with a transistor-based switching system. The master-side transistor switches between different signal levels (first level and second level) to encode data, and the slave-side transistor responds by switching its own signal levels, eliminating the need for complex conversion and timing circuits
2Adaptability or versatility
If A/D and D/A converters are added to achieve bidirectional communication, then data transmission and reception capability is improved, but the circuit configuration becomes complicated and circuit scale increases
Solution Approach 1:
The patent merges the functions of data transmission and reception into a single-wire interface using simple transistor switches. The master-side apparatus combines data output and clock signal generation into one communication line, and the slave-side apparatus combines data input and clock recovery into the same line, eliminating the need for separate transmit and receive paths that would require complex converters
Solution Approach 2:
The single-wire communication line serves multiple functions simultaneously: it carries both data and clock signals bidirectionally. The transistors on both master and slave sides act as universal switches that can transmit or receive data depending on the communication phase, eliminating the need for dedicated A/D and D/A converters for different signal directions
Data Source
AI summary
A data communication system, including master-side and slave-side data communication apparatuses configured to perform bidirectional communication with each other via a single-wire communication line. The master-side data communication apparatus includes first and second transistors performing switching according respectively to an input clock and write data, and a master-side data reproduction circuit reproducing read data transmitted from the slave-side. The slave-side data communication apparatus includes a clock reproduction circuit and a slave-side data reproduction circuit configured to respectively reproduce the input clock and the write data transmitted from the master-side, and a third transistor performing switching both according to the input clock reproduced by the clock reproduction circuit and according to the read data.