CN214380859U

CN214380859U - Touch key chip packaging structure for weakening wireless interference

Info

Publication number: CN214380859U
Application number: CN202120277690.0U
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: 2021-10-08
Anticipated expiration: 2031-01-30

Abstract

The utility model discloses a touch key chip packaging structure for weakening wireless interference, which 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; and 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. The utility model discloses a set up an inside passage of response wireless interference signal in packaging structure to this acquires the wireless interference signal in the environment purely, subtracts this simple wireless interference signal through the composite signal with the collection of button IO mouth again, obtains more accurate, more true key signal, has weakened touch key chip's wireless interference effectively.

Description

Touch key chip packaging structure for weakening wireless interference

Technical Field

The utility model relates to an electronic circuit and signal processing technology field, concretely relates to can weaken wireless interference's touch button chip package structure.

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.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a packaging structure of touch button chip can weaken touch button chip's wireless interference. The utility model discloses realize by 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.

The utility model discloses a set up an inside passage of response wireless interference signal in packaging structure to this acquires the wireless interference signal in the environment purely, subtracts this simple wireless interference signal through the composite signal with the collection of button IO mouth again, obtains more accurate, more true key signal, has weakened touch key chip's wireless interference effectively. Furthermore, the utility model discloses a design can also be under the condition that does not increase outside pin and use the consumption, realizes improving the ability of resisting space electromagnetic wave interference.

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 of the connection between the IO port of the chip and the PIN on the package shell in the touch chip package structure provided by 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 according to an embodiment of the present invention when there is wireless transmission interference.

(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 for full disclosure and are not intended to limit the present invention, and all changes that can be made without creative work based on the inventive idea and the equivalent technical features 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.