A/D Input Pull Circuit for Analog Sensor Wire Disconnection Detection
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Solution Overview
Problem
Existing control systems for detecting disconnection in wiring parts connected to semiconductor chips require additional components, increasing costs and complexity, especially when dealing with analog sensor signals.
Innovation Solution
Incorporating a pull device circuit within the semiconductor chip, which includes a switching element and resistor, allowing for disconnection detection without additional components by analyzing the output of an A/D converter when the switching element is in an on or off state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components are added to detect wiring disconnections, then detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The pull-up device circuit, originally designed for a single function, is made multi-functional by enabling it to perform both its primary function and wiring disconnection detection. The control unit utilizes the existing circuit components (resistor and switching element) to detect disconnections by monitoring voltage changes when the switching element is in different states, eliminating the need for separate detection components.
Solution Approach 2:
The system performs self-diagnosis by using its own internal pull-up device circuit to detect wiring disconnections. The control unit monitors the voltage at the input terminal of the A/D converter through the existing circuit components, allowing the system to detect faults without requiring external or additional specialized detection components.
2Reliability
If additional components are added to detect wiring disconnections, then detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The pull-up device circuit, originally designed for a single function, is made multi-functional by enabling it to perform both its primary function and wiring disconnection detection. The control unit utilizes the existing circuit components (resistor and switching element) to detect disconnections by monitoring voltage changes when the switching element is in different states, eliminating the need for separate detection components.
Solution Approach 2:
The system performs self-diagnosis by using its own internal pull-up device circuit to detect wiring disconnections. The control unit monitors the voltage at the input terminal of the A/D converter through the existing circuit components, allowing the system to detect faults without requiring external or additional specialized detection components.
Data Source
AI summary
A control system includes: a semiconductor chip, having built therein a processing part, an A/D converter and a pull device circuit; a wiring part, having one end connected to a terminal connected to the A/D converter; and a sensor, connected to the other end of the wiring part and inputting a sensor signal in analog form via the wiring part. The pull device circuit includes a switching element, and has one end connected to ground or a power supply voltage and the other end connected between the A/D converter and the terminal. The processing part includes: a switch control part, controlling the switching element to be in an on or off state; a sensor information generator, generating sensor information based on the sensor signal; and a disconnection detector, detecting disconnection of the wiring part based on output of the A/D converter when the switching element is in the on state.