Capacitive Sensor Pin Reduction via Merging
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Solution Overview
Problem
Conventional touch-sensor devices require a large number of pins to distinguish between multiple button operations, leading to increased power consumption and scan time, as well as larger circuit area and reduced robustness.
Innovation Solution
A sensing device configuration that uses multiple sensor elements electrically coupled to a single pin, where the sensitivity of each button operation is differentiated based on varying surface areas, allowing for the detection of multiple button operations using a single pin, thereby reducing pin count and scan time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a one-to-one configuration of pins to touch-sensor buttons is used, then each button operation can be distinguished, but the pin count increases leading to increased power consumption and scan time
Solution Approach 1:
Multiple sensor elements (first, second, and third sensor elements) are electrically coupled together and connected to a single pin of the processing device. This merging of multiple sensing channels into one physical connection reduces the pin count from N pins for N buttons to just 1 pin, directly resolving the contradiction between button distinction capability and device complexity.
Solution Approach 2:
The single pin connected to multiple sensor elements serves multiple functions: it detects button operations from different sensor elements, distinguishes between multiple button presses, and reduces the overall pin requirement. This multi-functionality allows one pin to replace what would traditionally require multiple dedicated pins.
2Measurement precision
If a one-to-one configuration of pins to touch-sensor buttons is used, then each button operation can be detected, but the scan time increases
Solution Approach 1:
By combining multiple sensor elements into a single electrical connection, the system reduces the number of sequential scan operations needed. Instead of scanning N separate pins for N buttons, the processing device scans a single pin that carries signals from all sensor elements, significantly reducing scan time while maintaining the ability to distinguish individual button operations through the sensor element identification process.
3Adaptability or versatility
If the pin count is increased, then more button operations can be distinguished, but the circuit area increases and robustness decreases
Solution Approach 1:
Multiple sensor element connections are merged into a single pin connection, dramatically reducing the circuit area required for pin connections and associated routing. This allows the circuit to support multiple button operations (higher adaptability) without proportionally increasing the physical circuit area, as all sensor elements share common connection pathways back to the processing device.
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 approach reduces power consumption and scan time while maintaining the ability to distinguish between multiple button operations, allowing for more compact and robust touch-sensor designs.
Implementation Method 1
the processing device 210 may include capacitance sensors 104-106, which are coupled to buttons 101-103, respectively. The capacitance sensors of the processing device are coupled to the touch-sensor buttons in a one-to-one configuration.
Data Source
AI summary
An apparatus and method for distinguishing a particular button operation from among multiple button operations on a sensing device having multiple sensor elements that are electrically coupled together. The apparatus may include a sensing device having a first sensor element and a second element that are electrically coupled to detect a presence of a conductive object on the sensing device. The method may include detecting a presence of a conductive object on a sensing device having multiple sensor elements that are electrically coupled, each sensor element corresponding to a button operation, and distinguishing between the multiple button operations.