Interface Voltage Switching Circuit for Stable Signal Levels
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Solution Overview
Problem
Conventional interface voltage switching techniques require dedicated terminals for each voltage level, leading to compatibility issues with existing interface specifications and unreliable voltage switching during operation, as they cannot determine if the voltage switching is completed successfully between host and slave devices.
Innovation Solution
An interface circuit with a clock output unit, terminal group, and interface voltage switching unit that selects between two interface voltages, controls the clock signal, and monitors input/output terminal signals to ensure stable and reliable voltage switching without additional terminals, using a control unit to verify successful switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dedicated terminals are added for each interface voltage level, then voltage switching capability is improved, but device complexity and terminal count increase
Solution Approach 1:
The existing interface terminals are made multi-functional by enabling them to operate at multiple voltage levels (1.8V and 3.3V). The interface circuit dynamically adapts to different voltage levels without requiring dedicated terminals for each voltage, thus maintaining compatibility while achieving voltage switching capability.
Solution Approach 2:
The interface circuit changes its operating voltage parameter dynamically based on the connected device. By detecting the voltage level and adjusting its own operating voltage accordingly, the circuit achieves adaptability without adding physical terminals, resolving the contradiction between versatility and complexity.
2Productivity
If voltage switching is performed during operation, then processing speed is improved, but reliability deteriorates due to inability to verify switching completion
Solution Approach 1:
The interface circuit incorporates a feedback mechanism that monitors the completion of voltage switching between host and slave devices. By detecting whether the voltage transition has been successfully completed, the system ensures reliable operation before resuming data transmission, thus maintaining both speed and reliability.
Solution Approach 2:
Before resuming normal operation after voltage switching, the system performs preliminary verification to confirm that the voltage transition is complete. This preliminary check ensures that subsequent operations occur at the correct voltage level, preventing errors and maintaining reliability during high-speed operation.
3Productivity
If interface voltage is lowered to increase processing speed, then productivity is improved, but compatibility with existing interfaces deteriorates
Solution Approach 1:
The interface circuit employs dynamic voltage adjustment, automatically adapting its operating voltage based on the connected device's requirements. This dynamic behavior allows the circuit to operate at lower voltages (1.8V) for high-speed processing when needed, while automatically switching to higher voltages (3.3V) to maintain compatibility with existing interfaces, thus resolving the contradiction between speed and compatibility.
Data Source
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AI summary
A communication system in which an operating voltage can be selected from a plurality of interface voltages enables an interface voltage to be switched in a stable manner during operation of the system. When the interface voltage is to be switched, a host device (1) and a slave device (2) perform the switching while maintaining the signal level of buses in a stable manner. This structure enables the communication system to switch an interface voltage using a small number of signal lines.