RC Timing Configuration Circuit for Single Strap Pin Addressing
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Solution Overview
Problem
In complex electronic systems, such as communication systems, the increasing number of devices leads to manufacturing and assembly complexity due to the need for multiple strap pin connections to differentiate device configurations, which increases costs and complexity, especially in large-scale applications like CAN communication systems where distance separation requires more connections.
Innovation Solution
The use of a resistor-capacitor (RC) circuit to determine device configurations based on charging or discharging time, employing comparator and timer circuitry to compare strap pin voltage to a threshold, allowing a single strap pin to be used for multiple devices by adjusting resistance and capacitance, thereby reducing the number of necessary connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple strap pin connections are used to differentiate device configurations, then device addressing capability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the parameter used for device configuration from discrete strap pin connections to continuous RC circuit timing characteristics. By varying resistance and capacitance values, the system creates distinguishable timing profiles that enable device addressing without requiring multiple physical connections. This transforms the configuration approach from mechanical/electrical connectivity to temporal parameter differentiation.
2Adaptability or versatility
If multiple strap pin connections are used to differentiate device configurations, then device addressing capability is improved, but assembly complexity increases
Solution Approach 1:
The patent extracts the configuration function from multiple strap pin connections and consolidates it into a single strap pin that works with RC circuit timing. This extraction eliminates the need for multiple separate connection points while maintaining the ability to differentiate device configurations through timing measurements, thereby simplifying assembly procedures.
Solution Approach 2:
The single strap pin is designed to serve multiple functions: it provides both the configuration identification and the timing reference for the RC circuit. By making the strap pin universal, the system eliminates the need for separate configuration pins while maintaining full device addressing capability through the timing-based configuration method.
3Adaptability or versatility
If distance separation is increased in communication systems, then system scalability is improved, but connection requirements increase
Solution Approach 1:
The patent replaces the mechanical/electrical connection-based configuration method with a timing-based electrical measurement. Instead of relying on physical strap pin connections to establish device identity, the system uses RC circuit charging/discharging times that can be measured electrically. This substitution allows devices to be uniquely identified through temporal characteristics rather than physical connectivity, facilitating greater system scalability.
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
This method reduces manufacturing complexity and cost by allowing a single strap pin to support multiple unique devices, enhancing precision and reducing configuration connections in systems with multiple secondary devices, while maintaining effective communication and addressing.
Implementation Method 1
The use of a resistor-capacitor (RC) circuit to determine device configurations based on charging or discharging time
Implementation Method 2
The use of a resistor-capacitor (RC) circuit to determine device configurations based on charging or discharging time, employing comparator and timer circuitry to compare strap pin voltage to a threshold
Data Source
AI summary
An example apparatus includes: a capacitor having a terminal; comparator circuitry having an input terminal and an output terminal, the input terminal of the comparator circuitry coupled to the terminal of the capacitor; timer circuitry having an input terminal and an output terminal, the input terminal of the timer circuitry coupled to the output terminal of the comparator circuitry; and configuration determination circuitry having an input and an output, the input of the configuration determination circuitry coupled to the output of the timer circuitry; and a configuration register having an input coupled to the output of the configuration determination circuitry.