Serial Communication Interface Converter Without Waveform-Shaping Circuits
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Solution Overview
Problem
Existing serial communication interface devices face issues with false detection due to signal degradation, requiring two types of waveform shaping circuits and noise filters to distinguish between chip select and data signals based on pulse widths.
Innovation Solution
A serial communication interface device that transmits and receives transmission start and end signals via a communication line, using a converter to generate and convert signals based on clock and data changes, eliminating the need for waveform shaping circuits and noise filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two types of waveform shaping circuits and noise filters are used to distinguish chip select signal from data signal based on pulse width, then signal distinction capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the pulse width distinction function from separate waveform shaping circuits and noise filters, and integrates it into the existing converter unit. The converter now performs both signal conversion and pulse width-based signal type determination, eliminating the need for additional dedicated circuits while maintaining the ability to distinguish between chip select signals and data signals.
Solution Approach 2:
The patent merges the function of waveform shaping circuits and noise filters into the converter unit. The converter is enhanced to not only convert SPI signals to pulse signals but also to determine signal types based on pulse width characteristics, combining multiple functions into a single integrated component that reduces overall device complexity.
2Reliability
If waveform shaping circuits and noise filters are added to handle signal degradation, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the converter unit to autonomously determine signal types based on pulse width characteristics without requiring external waveform shaping circuits or noise filters. The converter uses its own internal resources and logic to handle signal degradation and distinguish between different signal types, eliminating the need for additional reliability-enhancing components.
3Measurement precision
If pulse width-based signal distinction is implemented using separate circuits, then signal detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies universality by designing the converter unit to perform multiple functions: signal conversion from SPI to pulse format, pulse width measurement, and signal type determination. This multi-functional approach eliminates the need for separate dedicated circuits for each function, reducing the total component count and manufacturing cost while maintaining signal detection accuracy.
Data Source
AI summary
A serial communication interface device includes a converter, a transmitter, and a receiver. The converter generates a first signal and a second signal based on changes in a clock signal, and a third signal and a fourth signal based on changes in a data signal, converts into the clock signal and the data signal based on the first to the fourth signals, sets the transmission start signal in response to receiving the fourth signal during a period where the clock signal is a first level, and sets the transmission end signal in response to reception of the third signal after reception of the first signal. The transmitter converts the first to the fourth signals into a communication signal and transmits the communication signal to a communication line. The receiver converts the communication signal received from the communication line into the first to the fourth signals.