Sensor Module Digital Interface Noise Reduction
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Solution Overview
Problem
Inertial measurement units using analog angular velocity and acceleration sensors face issues with measurement accuracy due to noise interference from wiring, leading to deteriorated performance, especially when multiple sensors are connected, increasing complexity and cost.
Innovation Solution
A sensor module with digital X-axis, Y-axis, and Z-axis angular velocity sensors and acceleration sensors, each equipped with A/D conversion circuits, connected through separate digital interface buses to a microcontroller, reducing noise interference and eliminating the need for external A/D conversion ICs, thereby enhancing measurement accuracy and reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If analog sensor devices are used with external A/D conversion circuits, then device complexity is reduced, but measurement precision deteriorates due to noise interference from wiring
Solution Approach 1:
The patent merges the A/D conversion circuit with the sensor device to form an integrated sensor unit. This integration eliminates the need for separate external A/D conversion circuits and reduces wiring complexity while preventing noise interference, thereby achieving both reduced device complexity and maintained measurement precision.
Solution Approach 2:
The patent extracts the A/D conversion function from the external circuit and incorporates it directly into the sensor device. This extraction of the conversion function to the sensor level eliminates the noisy wiring between separate components while maintaining the benefits of modular design.
2Adaptability or versatility
If multiple analog sensor devices are connected with wiring, then device functionality is enhanced, but measurement precision deteriorates due to noise interference
Solution Approach 1:
The patent combines multiple sensor devices (angular velocity sensor and acceleration sensor) into an integrated sensor module where each sensor includes its own A/D conversion circuit. This merging approach enables multiple sensors to function together without the noise interference that would result from separate wiring connections, thus enhancing device functionality while maintaining measurement precision.
3Device complexity
If external A/D conversion circuits are used, then device complexity is reduced, but reliability deteriorates due to noise-induced measurement errors
Solution Approach 1:
The patent merges the A/D conversion circuit with each sensor device to eliminate noisy wiring between separate components. This integration improves reliability by preventing noise-induced measurement errors while maintaining acceptable device complexity through modular sensor unit design.
Data Source
AI summary
A sensor module includes an X-axis angular velocity sensor device that outputs digital X-axis angular velocity data, a Y-axis angular velocity sensor device that outputs digital Y-axis angular velocity data, a Z-axis angular velocity sensor device that outputs digital Z-axis angular velocity data, an acceleration sensor device that outputs digital X-axis, Y-axis, and Z-axis acceleration data, a microcontroller, a first digital interface bus that electrically connects the X-axis angular velocity sensor device, the Y-axis angular velocity sensor device, and the Z-axis angular velocity sensor device to a first digital interface, and a second digital interface bus that electrically connects the acceleration sensor device to a second digital interface.