Multiturn Rotary Encoder Interface for Fast Data With Fewer Pins
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Solution Overview
Problem
Multiturn rotary encoders face challenges with high signal line requirements and increased costs due to the use of parallel interfaces, and serial interfaces are too slow or complex for high-speed applications, leading to reliability issues and increased chip area.
Innovation Solution
A multiturn rotary encoder with an improved interface architecture that uses a parallel interface for the data word with the highest rate of change and a serial interface for the data word with the lowest rate of change, reducing the number of terminal pins needed and optimizing the cost/benefit ratio, especially when using an ASIC as the evaluation unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel interfaces are used for transmitting data from the multiturn unit to the evaluation unit, then high data-transmission rates are achieved, but the number of signal lines required increases significantly
Solution Approach 1:
The data transmission is segmented into two parts: high-rate data words are transmitted via parallel interface while low-rate data words are transmitted via serial interface. This segmentation allows the system to achieve high overall data transmission rates while significantly reducing the number of signal lines required, as the serial interface handles only the slower-changing data.
Solution Approach 2:
Different interface types are assigned to different data words based on their specific transmission rate requirements. The parallel interface is used locally for data words with high rates of change, while the serial interface is used locally for data words with low rates of change. This localized optimization resolves the contradiction by matching interface capabilities to actual data transmission needs.
2Device complexity
If simple serial interfaces are used to reduce the number of signal lines, then the number of lines is reduced, but the data transmission speed becomes too slow for high-speed applications
Solution Approach 1:
The data transmission is segmented into two parts: high-rate data words are transmitted via parallel interface while low-rate data words are transmitted via serial interface. This segmentation allows the system to achieve high overall data transmission rates while significantly reducing the number of signal lines required, as the serial interface handles only the slower-changing data.
Solution Approach 2:
Different interface types are assigned to different data words based on their specific transmission rate requirements. The parallel interface is used locally for data words with high rates of change, while the serial interface is used locally for data words with low rates of change. This localized optimization resolves the contradiction by matching interface capabilities to actual data transmission needs.
3Speed
If fast serial interfaces are used to increase data transmission speed, then the transmission speed is sufficient for high-speed applications, but the circuit complexity increases and chip area expands
Solution Approach 1:
The data transmission is segmented into two parts: high-rate data words are transmitted via parallel interface while low-rate data words are transmitted via serial interface. This segmentation allows the system to achieve high overall data transmission rates while significantly reducing the number of signal lines required, as the serial interface handles only the slower-changing data.
Solution Approach 2:
Different interface types are assigned to different data words based on their specific transmission rate requirements. The parallel interface is used locally for data words with high rates of change, while the serial interface is used locally for data words with low rates of change. This localized optimization resolves the contradiction by matching interface capabilities to actual data transmission needs.
4Speed
If fast serial interfaces are used to achieve sufficient transmission speed, then the transmission speed is adequate, but current consumption increases due to required drive strength
Solution Approach 1:
The data transmission is segmented into two parts: high-rate data words are transmitted via parallel interface while low-rate data words are transmitted via serial interface. This segmentation allows the system to achieve high overall data transmission rates while significantly reducing the number of signal lines required, as the serial interface handles only the slower-changing data.
Solution Approach 2:
Different interface types are assigned to different data words based on their specific transmission rate requirements. The parallel interface is used locally for data words with high rates of change, while the serial interface is used locally for data words with low rates of change. This localized optimization resolves the contradiction by matching interface capabilities to actual data transmission needs.
Data Source
AI summary
A multiturn rotary encoder includes a singleturn code disk which is joined in rotatably fixed manner to a shaft and which has a code track that is scannable by a singleturn scanning unit to ascertain the absolute position within one revolution of the shaft, a multiturn unit for measuring revolution data which are suitable for ascertaining the number of revolutions performed by the shaft, and an evaluation unit which is connected to the multiturn unit via at least two digital interfaces for transmitting the revolution data. The revolution data include at least two data words which have a different rate of change during rotation of the shaft, the interface for transmitting the data word having the highest rate of change to the evaluation unit is a parallel interface, and the interface for transmitting the data word having the lowest rate of change to the evaluation unit is a serial interface.