Transparent SPI Interface for Drop-In A/D Converter Replacement
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Solution Overview
Problem
Existing analog-to-digital converters (A/D converters) have non-standardized serial peripheral interfaces, leading to communication failures and the need for reprogramming when replaced by different manufacturers or types, which is time-consuming and costly, especially in regulated environments like aerospace.
Innovation Solution
Implementing a transparent serial peripheral interface (SPI) using an electrically erasable programmable read-only memory (EEPROM) to store initialization and configuration data for A/D converters, allowing seamless communication by accessing and updating this data upon connection, regardless of manufacturer or type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a non-standardized SPI interface is used for A/D converters, then manufacturer flexibility and device variety are improved, but compatibility and ease of replacement deteriorate
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of a configuration download system that mediates between the external component and the A/D converter. This intermediary stores and transfers unique configuration data through the SPI interface, enabling compatibility without requiring changes to the external component or A/D converter hardware, thus resolving the contradiction between manufacturer flexibility and ease of replacement
Solution Approach 2:
The patent implements preliminary action by pre-storing unique configuration data in memory associated with each A/D converter. This configuration data is prepared in advance and automatically downloaded when the A/D converter is detected, eliminating the need for real-time reprogramming and ensuring seamless replacement while maintaining manufacturer flexibility
2Adaptability or versatility
If reprogramming is required for A/D converter replacement, then interface customization is improved, but time consumption and cost increase
Solution Approach 1:
The patent enables self-service by allowing the A/D converter to automatically detect its presence, retrieve its unique configuration data from memory, and initialize itself without external intervention. This eliminates manual reprogramming tasks and significantly reduces time consumption while preserving interface customization capabilities
Solution Approach 2:
The patent uses copying by creating a copy of the configuration data in a separate memory location that can be independently accessed and downloaded. This allows the configuration information to be replicated and transferred without modifying the original A/D converter or external component, enabling quick replacement while maintaining customized interfaces
3Reliability
If unique configuration data is stored for each A/D converter, then communication compatibility is improved, but memory requirements and device complexity increase
Solution Approach 1:
The patent applies local quality by storing configuration data locally in memory associated with each specific A/D converter rather than using a centralized database. This distributed approach improves communication compatibility for each converter while minimizing overall memory requirements by only storing data where needed, thus resolving the contradiction between reliability and device complexity
Data Source
AI summary
An apparatus includes a serial peripheral interface (SPI) enabling the apparatus to communicate with an external component over an SPI bus. An analog to digital (A/D) converter is connected to the SPI and communicates with the external component over the SPI bus. A memory is connected to the SPI. The memory has a predetermined storage area for data enabling operation of the A/D converter with the external component over the SPI bus. The data enabling operation is uniquely associated with the A/D converter.