Bus Interface Voltage Detection for Automatic Address Assignment
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Solution Overview
Problem
Existing bus systems face challenges in efficiently and automatically assigning bus addresses to new bus participants during initialization, particularly in ensuring proper connection and supply voltage detection without additional signal lines.
Innovation Solution
A system comprising a controller and bus participants connected via a data bus, utilizing identical circuit arrangements with resistors and semiconductor switches to detect voltage states and trigger address requests, allowing for self-initialization and address assignment without additional signal lines, while incorporating protection circuits for voltage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a self-initializing interface is implemented for automatic address assignment, then the ease of operation is improved, but the device complexity increases due to additional circuit arrangements
Solution Approach 1:
The bus participant automatically detects voltage at its input terminal and generates an address request signal without external intervention. The system performs self-initialization by detecting the presence of a successor through voltage detection and automatically initiating address assignment procedures
Solution Approach 2:
The data bus serves multiple functions: data transmission and voltage detection for address assignment. The existing data bus infrastructure is utilized for dual purposes, eliminating the need for separate detection signal lines and reducing overall system complexity despite the added circuit functionality
2Reliability
If voltage detection is performed to detect successor connection and supply voltage status, then the reliability is improved, but the device complexity increases due to additional detection circuits
Solution Approach 1:
The data bus is used for both data transmission and voltage detection purposes. The existing bidirectional communication infrastructure performs dual functions, eliminating the need for separate detection signal lines and reducing overall system complexity while improving reliability
Solution Approach 2:
Voltage detection is performed indirectly through the data bus rather than requiring direct connection to power supply terminals. The data bus acts as an intermediary that provides voltage information about successor connection and supply status without requiring direct access to internal power circuits
3Adaptability or versatility
If additional signal lines are added for address assignment, then the functionality is improved, but the device complexity and wiring requirements increase
Solution Approach 1:
The data bus performs multiple functions including data transmission and address request signal transmission. By utilizing the existing bidirectional communication infrastructure for dual purposes, the system adds functionality without requiring additional dedicated signal lines, thereby avoiding increased wiring complexity
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 automatic and reliable bus address assignment for new bus participants, ensuring proper connection and supply voltage detection, reducing the need for additional signal lines and enhancing system reliability through voltage range determination and error handling.
Implementation Method 1
The first circuit arrangement has a device for detecting the voltage applied to the output OUT, e.g., to ground
Implementation Method 2
A first resistor R4 is arranged between the output OUT and the supply voltage terminal, and a second resistor R2 is arranged between the input IN and a ground terminal
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.