Automatic I/O Voltage Control Without Level Shifter Circuits
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Solution Overview
Problem
Existing electronic systems face increased cost and circuit area due to the need for level shifter circuits to translate signals between different voltage levels, and adding dedicated input/output voltage pins further complicates these systems.
Innovation Solution
Integrated circuits with interface voltage control and output voltage selection circuits that automatically identify the input/output voltage of connected devices, eliminating the need for level shifter circuits and dedicated I/O voltage pins by using a pull-up resistor and comparator circuits to select the appropriate output voltage for the output driver circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If level shifter circuits are added to translate signals between different voltage levels, then signal compatibility between devices with different voltages is improved, but system cost and circuit area increase
Solution Approach 1:
The output driver circuit is designed to perform multiple functions: it can operate in push-pull mode when connected to devices with the same voltage level and in open-drain mode when connected to devices with different voltage levels. The interface voltage control circuit automatically detects the connected device's voltage level and configures the output driver accordingly, eliminating the need for separate level shifter circuits for different voltage scenarios.
Solution Approach 2:
The interface voltage control circuit automatically detects the voltage level of the connected device and configures the output driver circuit accordingly without external intervention. The system self-adjusts by monitoring the voltage at the output terminal and selecting the appropriate output voltage through the output voltage selection circuit, thereby eliminating the need for manual configuration or additional level shifter hardware.
2Adaptability or versatility
If dedicated input/output voltage pins are added to support different voltage levels, then voltage adaptability is improved, but device complexity and pin count increase
Solution Approach 1:
The output driver circuit is designed to perform multiple functions: it can operate in push-pull mode when connected to devices with the same voltage level and in open-drain mode when connected to devices with different voltage levels. The interface voltage control circuit automatically detects the connected device's voltage level and configures the output driver accordingly, eliminating the need for separate level shifter circuits for different voltage scenarios.
Solution Approach 2:
The interface voltage control circuit automatically detects the voltage level of the connected device and configures the output driver circuit accordingly without external intervention. The system self-adjusts by monitoring the voltage at the output terminal and selecting the appropriate output voltage through the output voltage selection circuit, thereby eliminating the need for manual configuration or additional level shifter hardware.
3Reliability
If level shifter circuits are used to interface between different voltage levels, then communication reliability is improved, but system cost increases
Solution Approach 1:
The output driver circuit dynamically switches between push-pull and open-drain operating modes based on the detected voltage level of the connected device. The interface voltage control circuit continuously monitors the output terminal voltage and adjusts the output driver configuration in real-time, ensuring reliable communication across different voltage domains without requiring static level shifter circuits.
Solution Approach 2:
The system changes the operating parameters of the output driver circuit based on the detected voltage level. When a device with a different voltage level is detected, the output driver transitions to open-drain mode with an adjusted pull-up resistor value, ensuring proper voltage level translation and signal integrity without incurring the cost of dedicated level shifter components.
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 reduces system size and cost by eliminating the need for level shifter circuits and dedicated voltage pins, enabling efficient communication between devices with varying input/output voltage requirements without the need for additional hardware.
Implementation Method 1
The pull-up resistor is coupled to the open drain output terminal
Implementation Method 2
using a pull-up resistor and comparator circuits to select the appropriate output voltage
Data Source
AI summary
An integrated circuit includes an input terminal, an input buffer circuit, an interface voltage control circuit, an output voltage selection circuit, an output driver circuit, and an output terminal. The input buffer circuit is coupled to the input terminal. The interface voltage control circuit is coupled to the input terminal. The output voltage selection circuit is coupled to the interface voltage control circuit. The output driver circuit is coupled to the output voltage selection circuit. The output terminal is coupled to the output driver circuit.