Intelligent Semiconductor Switch Configuration via Threshold Validation
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Solution Overview
Problem
Intelligent semiconductor switches face reliability and robustness issues due to the potential failure or degradation of hardwired components, such as resistors, which can affect safety-critical parameters, particularly in automotive applications where functional safety standards like ISO 26262 must be met.
Innovation Solution
A circuit and method for an intelligent semiconductor switch that sets parameters based on a component parameter connected to a configuration pin, using standard values if the component parameter is below or above certain thresholds, ensuring the parameter remains within a safe range even if the component fails or degrades, thereby maintaining system functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If external components are used for configuration, then the system is easier to manufacture and configure, but the external component may fail or degrade, compromising system robustness
Solution Approach 1:
The control circuit performs preliminary checks of the externally connected component's parameter before the component can affect system operation. By pre-validating the component parameter against threshold values and pre-configuring appropriate standard values for the first parameter, the system prevents faulty configurations from compromising robustness.
Solution Approach 2:
The system prepares compensatory measures in advance by having multiple standard values ready for the first parameter. If the external component fails or degrades, the control circuit can immediately switch to a pre-determined standard value, cushioning against the impact of component failure on system robustness.
Data Source
AI summary
In accordance with an embodiment, a circuit includes: a supply pin and an output pin for connecting a load, and a configuration pin; a semiconductor switch connected between the supply pin and the output pin and configured to establish or to block a current path between the supply pin and the output pin depending on a control signal; and a control circuit configured to generate the control signal for the semiconductor switch taking account of a first parameter, and set the first parameter depending on a component parameter of an external component connected to the configuration pin. The first parameter is set to a first standard value when the component parameter is less than a first threshold value, and the first parameter is set to a second standard value when the component parameter is greater than a second threshold value.