Open-Drain Bus Repeater Pull-Down Detection at Low Supply Voltage
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Solution Overview
Problem
Existing open-drain bus repeaters for I2C communication systems face challenges in detecting pull-down events, especially when the supply voltage is low, and require complex detection circuitry, which complicates system implementation and increases power consumption.
Innovation Solution
The proposed bus repeater includes a B-side pull-down detection unit that compares the voltage at the B-side terminal to a reference voltage, generates a control signal to pull down the voltage when it falls below the reference minus a predefined voltage, and uses a current mirror to detect the pull-down event, improving detection accuracy and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex detection circuitry is used to detect pull-down events, then detection accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the essential detection function from complex circuitry by using a simplified voltage comparison mechanism. Instead of elaborate detection circuits, the invention compares the voltage at the B-side terminal directly against a reference voltage (Vref - Vpredefined) to detect pull-down events, achieving accurate detection with minimal circuit complexity.
Solution Approach 2:
The detection mechanism utilizes the existing voltage signals and circuit elements already present in the open-drain bus system. The B-side terminal voltage, reference voltage, and existing transistors are leveraged to perform detection without requiring additional dedicated detection components, allowing the system to detect pull-down events using its own inherent resources.
2Measurement precision
If complex detection circuitry is used to detect pull-down events, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent extracts the essential detection function from power-intensive circuitry by using a simplified voltage comparison mechanism. Instead of elaborate detection circuits that consume significant power, the invention compares the voltage at the B-side terminal directly against a reference voltage (Vref - Vpredefined) to detect pull-down events, achieving accurate detection with minimal power consumption.
Solution Approach 2:
The detection mechanism utilizes the existing voltage signals and circuit elements already present in the open-drain bus system. The B-side terminal voltage, reference voltage, and existing transistors are leveraged to perform detection without requiring additional dedicated detection components, allowing the system to detect pull-down events using its own inherent resources and minimizing additional power consumption.
3Reliability
If voltage comparison with reference voltage is used, then detection reliability is improved, but circuit complexity increases
Solution Approach 1:
The patent extracts the essential detection function from complex circuitry by using a simplified voltage comparison mechanism. Instead of elaborate detection circuits, the invention compares the voltage at the B-side terminal directly against a reference voltage (Vref - Vpredefined) to detect pull-down events, achieving accurate detection with minimal circuit 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
This solution enhances the detection of external pull-down events, reduces power consumption, and simplifies the detection circuitry, enabling more efficient and reliable communication in I2C bus systems.
Implementation Method 1
uses a current mirror to detect the pull-down event, improving detection accuracy and reducing power consumption
Data Source
AI summary
A repeater for open-drain bus communication and a system including the same is provided. The bus repeater includes an A-to-B buffer to receive the signal at the A-side terminal and to produce a first buffered signal, a B-side pull-down control unit to produce a first control signal based on the received first buffered signal, and a B-side pull-down element to pull down the voltage at the B-side terminal based on the first control signal. The B-side pull-down element includes a B-side pull-down transistor that is arranged in between the B-side terminal and a B-side ground reference terminal. The first control signal controls a voltage at the control terminal of the B-side pull-down transistor. The B-side pull-down control unit includes a B-side comparing unit to compare the voltage at the B-side terminal to a first reference voltage, and to generate the first control signal based on a result of the comparison.