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Capacitive key touch sensing using analog inputs and digital outputs

A capacitive, analog voltage technology, applied in the input/output process of data processing, electrical digital data processing, electronic switches, etc., can solve problems such as touch key operation degradation

Inactive Publication Date: 2012-05-30
NEODRON LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the LEDs must be driven and thereby require additional connections beyond those required for touch keys
The sense and drive operations can be multiplexed and thereby use a common connection for the LED and touch key circuitry, but the LED portion tends to degrade the operation of the touch key when the two are coupled together

Method used

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  • Capacitive key touch sensing using analog inputs and digital outputs
  • Capacitive key touch sensing using analog inputs and digital outputs
  • Capacitive key touch sensing using analog inputs and digital outputs

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Embodiment Construction

[0020] Reference is now made to the drawings, which schematically illustrate details of certain example embodiments. In the drawings, like elements will be represented by like numbers, and like elements will be represented by like numbers with different lowercase letter suffixes.

[0021] refer to figure 1 , which depicts a schematic diagram of a capacitive touch sensor key actuation detection and LED display circuit according to a specific example embodiment of the present invention. Integrated circuit device 102 includes analog-to-digital converter (ADC) 104, digital processor 106 with memory (not shown), sampling capacitor 108, which may be part of ADC 104, digital driver 114, and switches 110, 112, 114, and 130. . Switches 110 and 130 may be part of an internal multiplexer or the like. The switch 112 can be an output driver of the digital driver 114 , such as a totem-pole connected tri-state CMOS, an open-collector NMOS, or the like. A single capacitive touch sensor k...

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Abstract

A pulse is applied through a capacitive touch key sensor to a sampling capacitor of an analog-to-digital converter (ADC). The voltage charge arriving at the sampling capacitor will be maximum when there is substantially no shunt capacitance between the capacitive touch key sensor and the sampling capacitor. However, a object such as an operator's finger when in close proximity to the capacitive touch key sensor will create a capacitive shunt to ground that diverts some of the charge that is supposed to go to the sampling capacitor and thereby reduces the voltage charge on the sampling capacitor. This change in charge voltage when the capacitive touch key sensor is activated (touched) may be easily detected with the ADC. In addition, light emitting diodes (LEDs) may be integrated with the capacitive touch key sensors and use the same connections on an integrated circuit device in a time division multiplexed manor.

Description

[0001] Related Application Cross Reference [0002] This application advocates that Lin Jianyi (Chien-Yi Lin) filed an application on September 28, 2009, titled "Driving and Sensing Capacitive Key and Light-Emitting Diode Matrix with Digital Output and Analog Input Signals (Driving and Sensing Capacitive Key and LED Matrix with Digital-Output and Analog-Input Signals), jointly owning the priority of U.S. Provisional Patent Application No. 61 / 246,169, which is hereby incorporated by reference for all purposes. technical field [0003] This disclosure relates to sensing capacitive touch keys, and more particularly to driving and sensing capacitive touch keys using a minimum number of digital outputs and analog inputs. The present invention further relates to an improved method of driving light emitting diodes (LEDs) that is more compatible with the driving and sensing of capacitive touch keys described herein. The capacitive touch keys and LEDs can be arranged in a matrix and ...

Claims

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Application Information

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IPC IPC(8): H03K17/96G06F3/044G06F3/041
CPCG06F3/044H03K17/9622H03K2017/9613H03K17/962H03K2217/96073G06F3/0416
Inventor 林建益
Owner NEODRON LTD
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