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Keying operation detecting system and method

A technology of operation detection and button, applied in the field of button operation detection system, can solve problems such as wasting time and changing usage

Inactive Publication Date: 2013-10-30
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the ADC is an analog circuit, once the chip manufacturer is changed or the process is changed, it is necessary to re-examine whether the ADC is suitable; even, it may be necessary to redesign a suitable ADC, which will waste time
In addition, since the ADC has to be paired with analog pins, usually, the functions supported by the analog pins are fixed and cannot be changed according to design requirements.

Method used

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  • Keying operation detecting system and method
  • Keying operation detecting system and method
  • Keying operation detecting system and method

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Embodiment Construction

[0016] In the embodiment of the present invention, when a stable key operation (key activity) is detected, a corresponding operation will be performed in response to the stable key operation; otherwise, if the detected key operation is instantaneous (that is, an unstable key operation) , the key operation is ignored.

[0017] figure 1 A schematic diagram showing a key operation detection system according to an embodiment of the present invention. The key operation detection system 100 is placed in an electronic device, such as but not limited to, a DVD drive or a DVD player. like figure 1 As shown, the key operation detection system 100 includes: an input / output pin (I / O pin) 110 , a controller 120 , a resistor R, a plurality of keys K0 - K4 and a plurality of capacitors C0 - C4 . Capacitors C0 - C4 have different known capacitance values.

[0018] The input / output pin 110 is a digital pin. The I / O pin 110 has two operation modes: input mode and output mode. In response ...

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Abstract

The invention relates to a keying operation detecting system applied to an electronic device provided with at least one first key and a digital input / output pin. The method comprises the following steps of: switching the digital input / output pin to a first operation mode so that one voltage of the digital input / output pin is reduced to a ground voltage; switching the digital input / output pin to a second operation mode so as to boost the voltage of the digital input / output pin; measuring a first charging period of the voltage of the digital input / output pin; counting a first occurrence frequency of the first charging period; and judging whether the first key is operated stably according to the first occurrence frequency of the first charging period.

Description

technical field [0001] The invention relates to a key operation detection system and method. Background technique [0002] Currently, there are many ways to detect whether multiple keys are pressed / released. Taking a computer keyboard as an example, the computer keyboard is configured with a plurality of independent driving lines and sensing lines. By sequentially scanning the driving lines, it is possible to identify which computer key(s) are pressed / released. However, this method is more suitable for computer keyboards with large-area printed circuit boards. [0003] Take the human machine interface (human machine interface), for example, a DVD drive or DVD player with a push button, it is necessary to detect whether the button (such as a disc eject button) is pressed, so that the DVD drive or DVD player machine to make corresponding mechanical operations (for example, eject the disc). At present, to detect whether the key / button is pressed / released in the human-machin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327G01M99/00
Inventor 吴声宏
Owner NOVATEK MICROELECTRONICS CORP