Bus Interface Circuit for Automatic Address Assignment
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Solution Overview
Problem
Existing bus systems face challenges in efficiently and automatically assigning addresses to new bus participants during initialization, particularly in ensuring proper connection and supply voltage detection without additional signal lines.
Innovation Solution
A system with a controller and bus participants connected via a data bus, utilizing identical circuit arrangements with resistors and semiconductor switches to detect voltage and activate inputs, allowing for automatic address assignment by detecting connection and supply status, and encoding information through voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a self-initializing interface with automatic address assignment is implemented, then the ease of operation and automation are improved, but the device complexity increases due to additional circuit arrangements with multiple resistors and controllable semiconductor switches
Solution Approach 1:
The system enables self-initializing interfaces where bus participants automatically detect their connection status and receive address assignments without manual intervention. The circuit arrangements with resistors and controllable semiconductor switches automatically detect voltage levels to determine connection states, enabling automatic address assignment by the controller based on detected voltage ranges.
2Reliability
If voltage detection devices and multiple resistors are added to detect connection and supply status, then the reliability of connection verification is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The circuit arrangements with resistors (R1-R4) and controllable semiconductor switches serve multiple functions: they detect connection status, verify supply voltage presence, and enable automatic address assignment. The same circuit components that establish electrical connections also perform detection functions by measuring voltage levels at different connection states.
3Ease of manufacture
If additional signal lines are avoided to maintain simplicity, then the ease of manufacture is improved, but the difficulty of detecting and measuring connection status increases
Solution Approach 1:
The patent uses voltage level detection as an intermediary method to detect connection status without requiring additional signal lines. The circuit arrangements measure voltage levels at the output of bus participants, where different voltage ranges indicate different connection states (connected/disconnected, supply voltage present/absent). This allows the data bus itself to carry detection information.
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 self-initializing interfaces with automatic bus address assignment for new participants, ensuring reliable connection and supply verification with minimal additional signal lines, enhancing system robustness and cost-effectiveness.
Implementation Method 1
The first circuit arrangement has a device for detecting the voltage applied to the output OUT, e.g., to ground
Data Source
AI summary
In a system and method of operating a system that includes a controller and a first bus participant and a successor, the bus participant and successor each has a circuit arrangement arranged between an output and an input, a first resistor is arranged between the output and the supply voltage terminal, a second resistor is arranged between the input and a ground terminal, a third resistor can be arranged between the input and the supply voltage terminal by a first controllable semiconductor switch, and a fourth resistor can be arranged between the output and the supply voltage terminal by a second controllable semiconductor switch.