LPC Serial Interrupt Direction Control for Voltage Level Shifting
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Solution Overview
Problem
The existing LPC bus serial interrupt systems face challenges in efficiently exchanging signals between a CPU and external devices due to voltage level differences, which can result in hardware damage or incorrect signal interpretation.
Innovation Solution
A low pin count (LPC) bus serial interrupt system that includes an interrupt direction signal generator to determine the current interrupt direction and a level-shifter to convert the voltage level of signals exchanged between the host and the external device based on this direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage level conversion is implemented between host and external device, then signal exchange safety is improved, but device complexity increases
Solution Approach 1:
A level-shifter circuit is introduced as an intermediary component between the host and external device to convert voltage levels. This mediator handles the voltage translation automatically based on the interrupt direction signal, ensuring safe signal exchange without requiring complex control logic in the host or external device, thus resolving the contradiction between reliability and complexity.
2Measurement precision
If interrupt direction control is added to manage signal flow, then signal interpretation accuracy is improved, but device complexity increases
Solution Approach 1:
The system determines the interrupt direction in advance and generates an interrupt direction signal before signal exchange occurs. This preliminary action allows the level-shifter to be pre-configured with the correct voltage conversion parameters, ensuring accurate signal interpretation while avoiding the need for complex real-time detection and adjustment mechanisms.
3Object-affected harmful factors
If a level-shifter is integrated into the LPC bus system, then hardware protection is improved, but manufacturing complexity increases
Solution Approach 1:
The level-shifter is implemented as a dedicated, simple voltage conversion component that can be easily integrated into the LPC bus system. By using a specialized but relatively simple level-shifter circuit rather than complex protection mechanisms, the system achieves hardware protection while maintaining ease of manufacture and integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient and safe signal exchange between the CPU and external devices by accurately converting voltage levels, thereby preventing hardware damage and ensuring correct signal interpretation.
Implementation Method 1
a level-shifter configured to convert a voltage level of a signal exchanged between the host and the external device according to the current interrupt direction signal
Data Source
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Figure 4a~4b
Figure 5A
AI summary
A low pin count (LPC) bus serial interrupt system includes: an interrupt direction signal generator configured to determine a current interrupt direction signal according to whether a host currently sends a first interrupt signal to an external device; and a level-shifter configured to convert a voltage level of a signal exchanged between the host and the external device according to the current interrupt direction signal.