Touch key module and suspended touch key device

Abstract

The invention discloses a touch key module and a suspended touch key device, relates to the technical field of household electrical appliances, and solves the problem of low sensitivity of the suspended touch key technology of the existing household electrical appliances. The touch key module comprises a touch control chip and a plurality of fusion circuits connected with the touch control chip, each fusion circuit comprises a touch key circuit and an LED lamp bead circuit, and the fusion circuits work in a fusion time-sharing mode. During key scanning, a detection pin at one end of the touch key circuit is connected with an anode control pin of the LED lamp bead circuit in the touch chip; and when the LED is turned on or turned off, the detection pin at one end of the touch key circuit and the anode control pin of the LED lamp bead circuit are disconnected in the touch chip. According to the suspended touch key device, a touch sensing spring can be omitted, the cost is saved, the production difficulty is reduced, the semaphore of touch sensing can be improved, and the suspended performance of the touch key is improved.

Description

technical field [0001] The present invention relates to the technical field of home appliances, in particular to a touch key module and a floating touch key device. Background technique [0002] In the current home appliances, whether it is refrigerators, air conditioners, range hoods and other major appliances, or microwave ovens, induction cookers, desk lamps and other small appliances, the key functions are basically realized by capacitive touch keys. The keys have unparalleled advantages in waterproof, anti-fouling, durable and user experience. The touch button function is realized by using a dedicated touch button chip and an inductive sensor. The touch chip generally adopts the self-capacitance detection method. There are multiple touch-sensing channel pins on the chip. These pins are connected to the inductive sensor. When the human finger approaches Touching the sensor area will change the ground capacitance value on the corresponding sensing channel. The MCU inside...

AI Technical Summary

Problems solved by technology

[0004] Although induction springs are widely used as touch sensors in home appliances, they also have some obvious disadvantages compared to sensors designed with PCB copper skin.

Firstly, it increases the cost of materials; secondly, the spring is bulky and the production and welding efficiency is low; in addition, it is easy to deform, rust, and the side of the spring is highly sensitive, so the distance between adjacent springs should not be too close, etc.

For the touch sensor designed directly with the copper skin of the PCB board, the distance between the PCB board and the touch panel is generally required to be less than 5mm, otherwise the suspension distance is too large, which will cause small sensing data and be easily interfered by external signals.

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