Human Interface Device Multiplexing Pin Voltage Detection
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Solution Overview
Problem
Conventional human interface devices require multiple pins to detect operating states of control components, increasing manufacturing costs while limiting operating functions.
Innovation Solution
A human interface device design that uses a multiplexing pin with a voltage detection circuit to detect and control operations based on voltage values, allowing multiple control components to share one pin, reducing pin count and manufacturing costs while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple pins are used to detect operating states of different control components, then the operating functions are enhanced, but the manufacturing cost increases
Solution Approach 1:
The patent applies multi-functionality by enabling a single multiplexing pin to detect operating states of multiple different control components (e.g., left key, middle key, right key) through time-division multiplexing. The control chip sequentially multiplexes the pin to read different control components in different time periods, allowing one pin to perform the work of multiple pins and thereby reducing manufacturing cost while maintaining full operating functions.
Solution Approach 2:
The patent employs periodic action through time-division multiplexing, where the single pin is sequentially allocated to different control components in periodic time slots. The control chip reads the state of one control component, then switches to read another control component in the next time period, creating a periodic scanning pattern that enables multiple components to share the same pin without signal interference.
2Ease of manufacture
If the pin number is limited to reduce manufacturing cost, then the manufacturing cost decreases, but the operating functions are limited
Solution Approach 1:
The patent makes the pin universal by enabling it to serve multiple control components through multiplexing. Instead of having dedicated pins for each control component, the same pin is reused for different components at different times, thereby reducing the total pin count and manufacturing cost while preserving the ability to detect all control component states.
Solution Approach 2:
The patent resolves the pin number limitation by implementing periodic time-division multiplexing, where the limited number of pins is reused across multiple time periods to access different control components. This periodic scanning mechanism allows the system to maintain full operating functions despite having fewer physical pins.
3Device complexity
If a single pin is used to detect multiple control components, then the pin number and manufacturing cost are reduced, but the detection complexity increases
Solution Approach 1:
The patent manages detection complexity by using periodic time-division multiplexing, where the control chip systematically scans through different control components in sequential time slots. This structured periodic scanning approach organizes the detection process, allowing the single pin to be reused for multiple components without creating signal interference or excessive complexity in the detection circuitry.
Solution Approach 2:
The patent applies preliminary action through the use of control signals that prepare the multiplexing circuitry before each detection phase. The control chip generates multiplexing control signals in advance to switch the single pin to the appropriate control component before reading its state, thereby simplifying the detection process and avoiding complex simultaneous reading requirements.
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
Enables detection of different operating states of multiple control components using a single multiplexing pin, effectively reducing manufacturing costs while preserving operational capabilities.
Implementation Method 1
the voltage detection circuit is configured to detect a voltage value on the multiplexing pin
Data Source
AI summary
There is provided a human interface device including a control chip and a plurality of control components. The control chip includes a voltage detection circuit coupled to the plurality of control components via a multiplexing pin and detects a voltage value on the multiplexing pin through the voltage detection circuit thereby identifying an operating state of the plurality of control components.