CN112803942A

CN112803942A - Touch key chip packaging structure for weakening wireless interference and signal processing method

Info

Publication number: CN112803942A
Application number: CN202110131350.1A
Authority: CN
Inventors: 莫昌文
Original assignee: Zhuhai Jusheng Technology Co ltd
Current assignee: Zhuhai Jusheng Technology Co ltd
Priority date: 2021-01-30
Filing date: 2021-01-30
Publication date: 2021-05-14
Anticipated expiration: 2041-01-30
Also published as: CN112803942B

Abstract

The invention discloses a touch key chip packaging structure and a signal processing method for reducing wireless interference. The packaging structure comprises a packaging shell, a touch key chip packaged in the packaging shell, and a touch key connection PIN pin provided on the packaging shell; The touch key connection PIN pin is connected to the preset key IO port of the touch key chip; the package shell is also provided with a sensing device for sensing wireless interference signals, and the sensing device is connected to the preset wireless interference signal collection IO of the touch key chip. port connection. The present invention simply acquires the wireless interference signal in the environment by arranging an internal channel in the package structure for sensing the wireless interference signal, and then subtracts the simple wireless interference signal from the composite signal collected by the IO port of the button to obtain a more accurate wireless interference signal. Accurate and more realistic key signal, effectively reduce the wireless interference of touch key chip.

Description

Touch key chip packaging structure for weakening wireless interference and signal processing method

Technical Field

The invention relates to the technical field of electronic circuits and signal processing, in particular to a touch key chip packaging structure capable of weakening wireless interference and a signal processing method.

Background

The touch key is realized by adopting a mode of detecting finger capacitance to judge whether a finger touches a key entity in the actual key detection; the actual implementation form of the key may be a touch pad, a touch slide bar, or a touch spring, etc., as shown in fig. 1. In some application fields, the reliability of radio frequency interference needs to be tested for actual application products of touch keys; that is, in the actual test of interference, the touch key cannot be judged incorrectly or not (i.e., the touch is not reactive). For stronger radio frequency interference, interference shielding needs to be realized through application processing or hardware processing, and at present, most of the realization modes are that an application algorithm is used for filtering or performing other detection modes in data processing of touch key sampling corresponding to frequency characteristics of the radio frequency interference. These software or application processing methods need to consume certain software resources, and in strong interference, there is a possibility that the application cannot process the software or application.

Referring to fig. 2, in the process of testing the interference of the wireless radio frequency device, the wireless device can be a mobile phone, an interphone and the like, the wireless device sends strong radio waves, the electromagnetic field of the radio waves is spread in space and can be interfered with touch keys such as a key spring and the like, the radio waves are routed through a printed circuit board and enter a touch key chip through IO, the sampling data of the touch key module inside the chip can be influenced by the radio interference, and then the data has obvious fluctuation, and the fluctuation probability and the radio signals have certain strong frequency correlation.

Disclosure of Invention

The invention aims to provide a packaging structure of a touch key chip and a related signal processing method, which can weaken the wireless interference of the touch key chip. The invention is realized by the following technical scheme:

a touch key chip packaging structure for weakening wireless interference comprises a packaging shell, a touch key chip packaged in the packaging shell and a touch key connection PIN arranged on the packaging shell; the touch key connection PIN PIN is connected with a key IO port preset by the touch key chip; the method is characterized in that: the touch key chip is characterized in that an induction device used for inducing wireless interference signals is further arranged in the packaging shell, and the induction device is connected with a wireless interference signal acquisition IO port preset by the touch key chip.

According to the specific technical scheme, the touch key connection PIN is connected with a key IO port preset in the touch key chip through a binding line of a metal or alloy conductor.

As a specific technical scheme, the sensing device is connected with a wireless interference signal acquisition IO port preset by the touch key chip through a binding line of a metal or alloy conductor.

As a specific technical scheme, the sensing device is a metal coil and is implemented by using top metal physically designed by the touch key chip.

As a specific technical scheme, the wireless interference signal acquisition IO port is an internal IO port of the touch key chip.

As a specific technical scheme, the sensing device is a metal coil and is arranged in the packaging shell independently of the touch key chip.

According to the specific technical scheme, a microcircuit for processing the signals collected by the key IO port and the signals collected by the wireless interference signal collection IO port is arranged in the touch key chip.

A signal processing method based on the packaging structure comprises the following steps: the touch key chip acquires signals acquired by the key IO port and signals acquired by the wireless interference signal acquisition IO port; and the touch key chip performs subtraction operation on the signals collected by the key IO ports and the signals collected by the wireless interference signal collection IO ports respectively to obtain key signals.

As a specific technical scheme, the touch key chip performs the subtraction operation on the signals acquired by each key IO port and the signals acquired by the wireless interference signal acquisition IO ports through a microcircuit arranged therein or a signal processing algorithm integrated therein, so as to acquire the key signals.

As a specific technical scheme, before the subtraction operation is performed, a microcircuit arranged in the touch key chip or a signal processing algorithm integrated therein performs filtering processing and adaptive weighting scaling processing on the signals acquired by the key IO port and the signals acquired by the wireless interference signal acquisition IO port.

According to the invention, the internal channel for sensing the wireless interference signal is arranged in the packaging structure, so that the wireless interference signal in the environment is simply obtained, and then the simple wireless interference signal is subtracted from the composite signal acquired by the key IO port to obtain a more accurate and more real key signal, so that the wireless interference of the touch key chip is effectively weakened. In addition, the design of the invention can also realize the improvement of the capacity of resisting the space electromagnetic wave interference under the condition of not increasing the use consumption of external pins.

Description of the drawings

Fig. 1 is a circuit diagram of a conventional touch key in the form of a touch spring connected to a touch key chip (MCU in the figure).

Fig. 2 is a schematic diagram of the circuit shown in fig. 1 when wireless transmission type interference exists.

Fig. 3 is a schematic diagram illustrating a connection between a chip IO port and a PIN on a package shell in the touch chip package structure according to the embodiment of the present invention.

Fig. 4 is a schematic diagram of the touch chip package structure shown in fig. 3, in which an inductive device is disposed and connected to an IO port of the chip.

Fig. 5 is a schematic diagram of a touch chip package structure provided in an embodiment of the present invention when wireless transmission interference exists.

(specific embodiments) in all cases

Referring to fig. 3, the touch key chip package structure provided in this embodiment includes a package case 10, a touch key chip (denoted as Die in the figure), and a plurality of PIN PINs. The touch key chip is provided with a plurality of IO ports and other functional interfaces, the touch key chip is packaged in the packaging shell, and the PIN PINs are arranged on the packaging shell 10 and are respectively connected with the preset key IO ports of the touch key chip correspondingly.

As shown in fig. 4, the touch key chip package structure further includes an induction device 20, the induction device 20 is a metal coil for inducing a wireless interference signal, and the induction device 20 is connected to a wireless interference signal acquisition IO port preset in the touch key chip, where the wireless interference signal acquisition IO port is an internal IO port of the touch key chip in this embodiment.

Specifically, a touch key connection PIN PIN is connected with a key IO port preset by a touch key chip through a binding line of a metal or alloy conductor; in order to make the internal channel and the external key channel more nearly consistent, the internal channel also needs to be connected by a binding line, and the wireless interference signal acquisition IO port preset by the sensing device 20 and the touch key chip is also connected by the binding line of the metal or alloy conductor. In addition, when the sensing device 20 adopts a metal coil, the metal coil is implemented by using a top metal layer of a touch key chip physical design. Of course, the metal coil may also be disposed in the package case 10 independently from the touch key chip. Moreover, the metal coil adopts proper number of turns, shape of the turns and length of the wire according to the specific application environment of the packaging structure and/or the internal space of the packaging structure.

The signals collected by the key IO port and the signals collected by the wireless interference signal collection IO port need to be processed by a touch key chip, and the signals collected by the key IO port and the signals collected by the wireless interference signal collection IO port are subtracted respectively to obtain more accurate and real key signals.

In this embodiment, a microcircuit is disposed in the touch key chip, and is configured to perform subtraction operation and perform filtering processing and adaptive weighting and scaling processing on the signal acquired by the key IO port and the signal acquired by the wireless interference signal acquisition IO port before the subtraction operation. Certainly, the microcircuit on the hardware is not provided, and a related signal processing algorithm integrated in the touch key chip may be used to perform subtraction on the signals acquired by each key IO port and the signals acquired by the wireless interference signal acquisition IO port, and before the subtraction, the signals acquired by the key IO ports and the signals acquired by the wireless interference signal acquisition IO ports are filtered and adaptively weighted and scaled.

As shown in fig. 5, the present invention detects or receives external radio-related interference by adding an internal channel, and the data on the internal channel represents a part of the radio interference information. In actual use, each external corresponding touch channel data is subtracted from the internal channel data, the corresponding interference is subtracted, and finally the interference of the data portion is reduced. And after filtering, carrying out weighted scaling, and then carrying out subtraction operation on the filtered signal and the external channel, wherein the approximation means that after certain weighted scaling, the interference characteristics received by the internal channel and the external channel are consistent, and the interference characteristics are similar to common-mode signals, and common-mode interference is eliminated by carrying out difference to realize a differential effect.

The above embodiments are merely provided for full disclosure and not for limitation, and any replacement of equivalent technical features based on the gist of the present invention without creative efforts should be considered as the scope of the present disclosure.

Claims

1. A touch key chip packaging structure for weakening wireless interference comprises a packaging shell, a touch key chip packaged in the packaging shell and a touch key connection PIN arranged on the packaging shell; the touch key connection PIN PIN is connected with a key IO port preset by the touch key chip; the method is characterized in that: the touch key chip is characterized in that an induction device used for inducing wireless interference signals is further arranged in the packaging shell, and the induction device is connected with a wireless interference signal acquisition IO port preset by the touch key chip.

2. The touch key chip package structure of claim 1, wherein: and the touch key connecting PIN foot is connected with a key IO port preset by the touch key chip through a binding line of a metal or alloy conductor.

3. The touch key chip package structure of claim 2, wherein: the induction device is connected with a wireless interference signal acquisition IO port preset by the touch key chip through a binding line of a metal or alloy conductor.

4. The touch key chip package structure of any one of claims 1 to 3, wherein: the induction device is a metal coil and is realized by using top metal of the touch key chip in physical design.

5. The touch key chip package structure of claim 4, wherein: the wireless interference signal acquisition IO port is an internal IO port of the touch key chip.

6. The touch key chip package structure of any one of claims 1 to 3, wherein: the induction device is a metal coil and is independent of the touch key chip and arranged in the packaging shell.

7. The touch key chip package structure of claim 1, wherein: and a microcircuit for processing the signals collected by the key IO port and the signals collected by the wireless interference signal collection IO port is arranged in the touch key chip.

8. A signal processing method based on the package structure of any one of claims 1 to 7, comprising: the touch key chip acquires signals acquired by the key IO port and signals acquired by the wireless interference signal acquisition IO port; and the touch key chip performs subtraction operation on the signals collected by the key IO ports and the signals collected by the wireless interference signal collection IO ports respectively to obtain key signals.

9. The signal processing method according to claim 8, characterized in that: and the touch key chip performs subtraction operation on the signals acquired by the key IO ports and the signals acquired by the wireless interference signal acquisition IO ports respectively through a microcircuit arranged in the touch key chip or a signal processing algorithm integrated in the touch key chip to acquire the key signals.

10. The signal processing method according to claim 9, characterized in that: and before the reduction operation is carried out, the signal collected by the key IO port and the signal collected by the wireless interference signal collection IO port are filtered and adaptively weighted and zoomed by a microcircuit arranged in the touch key chip or a signal processing algorithm integrated in the microcircuit.