Single-Wire Data Link Circuit for Bidirectional Signaling
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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 utilizing a master-side and slave-side apparatus connected via a single-wire communication line, employing transistors, resistors, and specific circuit configurations to efficiently transmit and receive data, including a connection breaking circuit to suppress leak current and reduce circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If A/D and D/A converters are added to the communication apparatus, then bidirectional data communication capability is improved, but circuit scale increases
Solution Approach 1:
The patent combines the A/D converter and D/A converter into a single shared converter unit that can operate in both conversion directions. The same physical converter circuit performs analog-to-digital conversion when receiving signals and digital-to-analog conversion when transmitting signals, eliminating the need for separate converter circuits on each side and reducing overall circuit scale while maintaining full bidirectional communication capability
Solution Approach 2:
The communication apparatus is designed with a universal converter that serves multiple functions: it acts as an A/D converter during reception mode and as a D/A converter during transmission mode. This multi-functional design allows a single circuit component to replace what would traditionally require two separate components, thereby reducing circuit complexity while preserving adaptability for bidirectional communication
2Reliability
If timer circuits are added for time clocking, then communication timing control is improved, but circuit scale increases
Solution Approach 1:
The patent merges the timer circuit functionality into the shared converter unit and control logic, eliminating the need for separate dedicated timer circuits. The control unit utilizes the timing capabilities already present in the converter operation to manage communication timing, thereby maintaining reliable time clocking while reducing overall circuit scale
Solution Approach 2:
The control unit is designed to perform multiple functions including timing control, data processing, and converter management. By making the control unit universal and multi-functional, the patent eliminates the need for separate specialized timer circuits, reducing circuit complexity while maintaining reliable communication timing control through integrated timing management
3Loss of energy
If connection breaking circuit is added, then leak current suppression is improved, but circuit complexity increases
Solution Approach 1:
The connection breaking circuit is integrated into the existing switchable architecture of the communication apparatus, combining the leak current suppression function with the existing transmission/reception switching mechanism. The same switching elements used for mode conversion also serve to break connections and suppress leak currents, eliminating the need for entirely separate suppression circuits and reducing overall circuit complexity
Data Source
AI summary
A system is connected to a single-wire communication line to perform bidirectional communication between a master side and a slave side, and an input clock-side transistor connected between a GND level and the communication line performs switching according to an input clock. A first transistor is connected between a first potential and the communication line, a second transistor has one end connected to a second potential, and a master-side resistor is connected between the other end of the second transistor and the other end of a third transistor. A fourth transistor is connected between the communication line and a third potential equal to or higher than the first potential, and a slave-side resistor is connected between the communication line and the GND level.