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Intensive capacitive touch key circuit supporting hardware waterproofness

A capacitive touch technology that supports hardware, applied in electrical components, electronic switches, pulse technology, etc., can solve problems such as false triggering of capacitive touch buttons

Inactive Publication Date: 2021-06-29
深圳前海维晟智能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some electronic products, parasitic capacitance is often generated due to oil stains, water droplets, water films, etc.

Method used

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  • Intensive capacitive touch key circuit supporting hardware waterproofness
  • Intensive capacitive touch key circuit supporting hardware waterproofness
  • Intensive capacitive touch key circuit supporting hardware waterproofness

Examples

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Embodiment Construction

[0023] Such as Figure 1 to Figure 2 As shown, the dense capacitive touch key circuit that supports hardware waterproofing, where:

[0024] It has an MCU unit 1, a button unit 2 connected to the MCU unit 1, and an external capacitor C0;

[0025] The key unit 2 has a plurality of capacitive touch keys 20 densely arranged;

[0026] The MCU unit 1 provides a plurality of charging circuits corresponding to the capacitive touch keys 20 through the built-in circuit logic, and also provides a plurality of first switches one-to-one corresponding to the charging circuits. Capacitive touch button 20 charging; figure 2 As shown, the capacitive touch key 20 includes capacitive touch keys T1 to Tn, the first switch includes a first switch SA1 to a first switch SAn, and the charging circuit includes a charging circuit 31 to a charging circuit 3n;

[0027] The MCU unit 1 also provides a plurality of second switches corresponding to the capacitive touch keys 20 through the built-in circui...

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Abstract

An intensive capacitive touch key circuit supporting hardware waterproofness is provided with an MCU unit, a key unit and a plug-in capacitor. The key unit is provided with a plurality of capacitance touch keys which are densely arranged; the MCU unit provides a plurality of charging circuits corresponding to the capacitive touch keys through built-in circuit logic, and also provides a plurality of first switches corresponding to the charging circuits one by one; the MCU also provides a plurality of second switches corresponding to the capacitive touch keys through built-in circuit logic, and the capacitive touch keys are connected in parallel to one end of the plug-in capacitor through the corresponding second switches; the MCU also provides a third switch which is in bridge connection with the two ends of the external capacitor C0 through built-in circuit logic; and the MCU unit drives the third switch to be switched on and switched off periodically by using a clock signal, and scans the capacitive touch keys one by one during the switching-off period of the third switch. A special waterproof electrode is not needed, and the touch panel is very suitable for occasions with many touch keys.

Description

technical field [0001] The invention relates to the technical field of key circuit waterproofing, in particular to an intensive capacitive touch key circuit supporting hardware waterproofing. Background technique [0002] Capacitive touch buttons are a common user interface for electronic products. By detecting changes in the capacitance on the buttons to determine whether there is a finger touch action; compared with mechanical buttons, capacitive touch buttons have the characteristics of beautiful appearance, ease of use, and long life. However, in some electronic products, parasitic capacitance is often generated due to oil stains, water droplets, water films, etc. on the capacitive touch keys, which in turn leads to false triggering of the capacitive touch keys. [0003] In view of the above situation, on the basis of the existing capacitive touch key scheme, how to eliminate the influence of oil, water droplets, and water film on the key capacitance, so as to realize th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/975
CPCH03K17/975
Inventor 戴锐崔伟青崔松叶
Owner 深圳前海维晟智能技术有限公司
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