IO Access Control Circuit for High-Voltage Open-Drain Reliability
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Solution Overview
Problem
Existing IO circuits face poor open-drain performance when the external power source voltage exceeds the core voltage, leading to reliability issues and slow voltage increase, which can cause electric leakage.
Innovation Solution
An access control signal generation circuit is introduced, featuring a bias module that generates an access control signal based on the IO port signal and control signal, with a voltage value determined by a percentage of the IO port signal, and an access control module that controls cut-off or conduction, ensuring the first interface signal varies according to the IO port signal in open-drain mode, thus preventing slow voltage increase and electric leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the external power source voltage is higher than the core voltage, then the IO circuit can interface with external circuits, but the open-drain output property deteriorates and device reliability decreases
Solution Approach 1:
The patent introduces an access control signal generation circuit as an intermediary component between the IO port and the internal circuitry. This circuit generates access control signals based on the relationship between external power source voltage and core voltage, enabling the IO circuit to safely interface with external circuits while maintaining device reliability by preventing overvoltage conditions.
Solution Approach 2:
The patent dynamically adjusts the access control signal parameters based on the voltage relationship between external and core power sources. When external voltage exceeds core voltage, the access control circuit modifies signal levels and timing to maintain proper open-drain operation while protecting internal devices from overvoltage damage.
2Adaptability or versatility
If the external power source voltage is significantly higher than the core voltage, then voltage conversion is enabled, but the voltage increase speed slows down and electric leakage occurs
Solution Approach 1:
The access control signal generation circuit acts as an intermediary that actively manages the voltage transition process. It generates controlled access signals that accelerate the voltage increase at the IO port while preventing electric leakage by ensuring proper timing and level coordination during the voltage transition.
Solution Approach 2:
The access control circuit performs preliminary actions by generating preparatory signals before the main voltage transition occurs. This preliminary signal generation ensures that the IO port is properly conditioned to accept the voltage increase, preventing electric leakage and accelerating the transition speed.
3Adaptability or versatility
If the IO circuit operates in open-drain mode with high external voltage, then external circuit compatibility is improved, but the access control performance deteriorates
Solution Approach 1:
The access control signal generation circuit serves as a mediator that translates external high-voltage signals into appropriate internal control signals. It maintains access control performance by generating properly leveled signals that reflect the external voltage state while protecting internal circuitry, enabling both external compatibility and reliable access control.
Data Source
AI summary
The present disclosure provides an IO circuit and an access control signal generation circuit for the IO circuit. In one implementation, the access control signal generation circuit includes: a bias module coupled with an IO port, for generating an access control signal according to an IO port signal and an IO control signal, where a voltage value of the access control signal is a maximum value of a voltage value of an IO port voltage division signal and a voltage value of the IO control signal, and the voltage value of the IO port voltage division signal is a percentage of a voltage value of the IO port signal; an access control module coupled with the bias module, the access control module configured to control cut-off or conduction when receiving the access control signal and the IO port signal and outputting a first interface signal; and a higher-selection module configured to generate a second interface signal according to an IO power source signal and the IO port signal. In the present disclosure, the voltage of the first interface signal varies according to the voltage of an IO port, so as to resolve the problem of reliability, thereby improving the open-drain performance.