An on-chip integrated capacitive touch sensing device and its implementation method

Abstract

The invention discloses an on-chip integrated capacitive touch sensing device, which comprises a sensing capacitor, a capacitive touch sensing oscillator and a central control unit, wherein the central control unit is independently connected with the sensing capacitor and the capacitive touch sensing oscillator; the sensing capacitor and the capacitive touch sensing oscillator are connected; and the capacitive touch sensing oscillator comprises a capacitive touch sensing oscillator with high power consumption and a capacitive touch sensing oscillator with low power consumption. By use of the on-chip integrated capacitive touch sensing device, on-chip integrated capacitive touch sensing oscillators with high power consumption and low power consumption are realized, and wider touch use environment can be met. Since the oscillator is directly connected with the central control unit, compared with the prior art, the device is characterized in that other external electronic components are reduced and cost is low. The detection of a touch key and the sensitivity regulation of the touch key can be realized through the simple configuration of the central control unit. The invention also discloses an implementation method for the on-chip integrated capacitive touch sensing device, a high-frequency algorithm is adopted to awaken touch action judgment in fixed time, and low-power-consumption application is realized.

Description

technical field [0001] The present invention relates to a touch device, in particular to a capacitive touch sensing device and a realization method thereof. Background technique [0002] With the development of digital-analog hybrid circuits, microcontrollers and micro-processing technologies have covered all areas of our lives, from large industrial equipment to tiny smart watches, touch control has been widely used. People send instructions to the microcontroller through the touch sensing module to complete the control of the device, thereby realizing human-computer interaction. Compared with traditional mechanical switches, more and more electronic products have begun to switch from traditional mechanical keys to capacitive touch keys due to the advantages of capacitive touch switches, such as convenience, ease of use, and waterproof and moisture-proof. [0003] At present, the capacitive touch key is usually designed with the MCU chip on the market as a supporting touch...

AI Technical Summary

Problems solved by technology

Most capacitive touch sensing technologies are based on measuring the frequency or duty cycle changed by the extra capacitance generated by human finger touch, but the traditional capacitive touch technology requires more peripheral components and has poor ability to adapt to complex external environments. , the frequency drop of the capacitive sensing oscillator will lead to false triggering, and during long-term use, the touch keys will age, which may cause key failures, and most of them are not suitable for low-power applications.

Images