Touch Button Chip Packaging Structure and Signal Processing Method for Reducing Wireless Interference

Abstract

The present invention discloses a touch button chip packaging structure and a signal processing method for reducing wireless interference. The packaging structure includes a packaging shell, a touch button chip encapsulated in the packaging shell, and touch button connection PINs provided on the packaging shell; the touch button connection PINs are connected to the preset button IO ports of the touch button chip; an induction device for sensing wireless interference signals is further provided in the packaging shell, and the induction device is connected to the preset wireless interference signal acquisition IO ports of the touch button chip. By providing an internal channel for sensing wireless interference signals in the packaging structure, the present invention simply obtains the wireless interference signals in the environment, and then subtracts the simple wireless interference signals from the composite signals collected by the button IO ports to obtain more accurate and real button signals, effectively reducing the wireless interference of the touch button chip.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits and signal processing, and particularly to a touch button chip packaging structure and a signal processing method capable of reducing wireless interference. Background Art

[0002] In the actual implementation of button detection, a touch button determines whether a finger touches the button entity by detecting the finger capacitance; the actual implementation form of the button can be a touch pad, a touch slider, a touch spring, etc., as shown in Figure 1 Shown. In some application fields, the actual application products of touch buttons need to test the reliability of radio frequency interference; that is, in the actual interference test, the touch button should not make a wrong judgment or a missed judgment (that is, no response to touch). For strong radio frequency interference, interference shielding needs to be achieved through application processing or hardware processing. Currently, the more common implementation method is to use an application algorithm to filter or perform other detection methods on the sampled data of the touch button according to the frequency characteristics of the radio frequency interference. These software or application processing methods consume a certain amount of software resources, and there is a possibility that the application cannot handle strong interference.

[0003] See Figure 2 Shown, during the interference test of a wireless radio frequency device, the wireless device can be a mobile phone, a walkie-talkie, etc. The wireless device emits strong radio waves, and the electromagnetic field of the radio waves propagates in space and will crosstalk with touch buttons such as button springs. After passing through the printed circuit board traces and entering the touch button chip through the IO, the sampled data of the touch button module inside the chip will be affected by wireless interference, and thus the data will have obvious fluctuations. The probability of the fluctuations has a certain strong frequency correlation with the radio signal itself. Summary of the Invention

[0004] The purpose of the present invention is to provide a packaging structure of a touch button chip and a related signal processing method capable of reducing wireless interference of the touch button chip. The present invention is realized by the following technical solutions:

[0005] A touch button chip packaging structure for reducing wireless interference includes a packaging shell, a touch button chip encapsulated inside the packaging shell, and a touch button connection PIN foot provided on the packaging shell; the touch button connection PIN foot is connected to a preset button IO port of the touch button chip; the feature is that: an induction device for sensing wireless interference signals is further provided inside the packaging shell, and the induction device is connected to a preset wireless interference signal acquisition IO port of the touch button chip.

[0006] As a specific technical solution, the touch button connection PIN foot is connected to the preset button IO port of the touch button chip through a bonding wire made of metal or alloy conductor.

[0007] As a specific technical solution, the sensing device is connected to a wireless interference signal acquisition IO port preset in the touch button chip through a bonding wire made of metal or alloy conductor.

[0008] As a specific technical solution, the sensing device is a metal coil, which is implemented by using the top layer metal of the physical design of the touch button chip.

[0009] As a specific technical solution, the wireless interference signal acquisition IO port is an internal IO port of the touch button chip.

[0010] As a specific technical solution, the sensing device is a metal coil, which is independently arranged in the packaging shell relative to the touch button chip.

[0011] As a specific technical solution, a microcircuit for processing the signals collected by the button IO port and the signals collected by the wireless interference signal acquisition IO port is arranged in the touch button chip.

[0012] A signal processing method based on the above packaging structure includes: the touch button chip acquires the signals collected by the button IO port and the signals collected by the wireless interference signal acquisition IO port; the touch button chip performs a subtraction operation on the signals collected by each button IO port and the signals collected by the wireless interference signal acquisition IO port respectively to obtain button signals.

[0013] As a specific technical solution, the touch button chip performs the subtraction operation on the signals collected by each button IO port and the signals collected by the wireless interference signal acquisition IO port respectively through the microcircuit arranged therein or the signal processing algorithm integrated therein to obtain the button signals.

[0014] As a specific technical solution, before performing the subtraction operation, the microcircuit arranged in the touch button chip or the signal processing algorithm integrated therein performs filtering processing and appropriate weighted scaling processing on the signals collected by the button IO port and the signals collected by the wireless interference signal acquisition IO port.

[0015] In the present invention, an internal channel for sensing wireless interference signals is arranged in the packaging structure to simply acquire the wireless interference signals in the environment, and then the composite signals collected by the button IO port are subtracted from the simple wireless interference signals to obtain more accurate and real button signals, effectively reducing the wireless interference of the touch button chip. In addition, the design of the present invention can also improve the ability to resist spatial electromagnetic wave interference without increasing the consumption of external pin usage. Description of the Drawings

[0016] Figure 1 The circuit diagram shows the connection between a touch button in the form of an existing touch spring and a touch button chip (MCU in the figure).

[0017] Figure 2 is Figure 1 The schematic diagram shows the situation when there is wireless transmission interference in the shown circuit.

[0018] Figure 3 The schematic diagram shows the connection between the chip IO port and the PIN foot on the package shell in the touch chip package structure provided by the embodiment of the present invention.

[0019] Figure 4 is Figure 3 Based on the above, the schematic diagram shows the situation where an induction device is set in the touch chip package structure and the induction device is connected to the chip IO port.

[0020] Figure 5 The schematic diagram shows the situation when there is wireless transmission interference in the touch chip package structure provided by the embodiment of the present invention. Detailed implementation mode

[0021] Combined with Figure 3 As shown, the touch button chip package structure provided in this embodiment includes a package shell 10, a touch button chip (labeled as Die in the figure), and several PIN feet. The touch button chip has several IO ports and other functional interfaces. The touch button chip is packaged in the package shell, and several PIN feet are set on the package shell 10 and are respectively connected to the preset button IO ports of the touch button chip.

[0022] Combined with Figure 4 As shown, the touch button chip package structure further includes an induction device 20. The induction device 20 is a metal coil for sensing wireless interference signals, and the induction device 20 is connected to the preset wireless interference signal acquisition IO port of the touch button chip. In this embodiment, the wireless interference signal acquisition IO port is an internal IO port of the touch button chip.

[0023] Specifically, the touch button connection PIN foot and the preset button IO port of the touch button chip are connected by a bonding wire made of metal or alloy conductor; in order to make the internal channel and the external button channel more consistent, an internal channel also needs a bonding wire connection, and the induction device 20 and the preset wireless interference signal acquisition IO port of the touch button chip are also connected by a bonding wire made of metal or alloy conductor. In addition, when the induction device 20 adopts the form of a metal coil, the metal coil is realized by using the top layer metal of the physical design of the touch button chip. Of course, the metal coil can also be set in the package shell 10 independently of the touch button chip. Moreover, the metal coil adopts appropriate number of turns, coil shape and wire length according to the specific application environment of the package structure and / or the internal space of the package structure.

[0024] The signals collected by the button IO ports and the signals collected by the wireless interference signal collection IO ports also need to be processed by the touch button chip. Specifically, subtraction operations are performed on the signals collected by each of the button IO ports and the signals collected by the wireless interference signal collection IO port respectively to obtain more accurate and real button signals.

[0025] In this embodiment, a microcircuit for processing the signals collected by the button IO ports and the signals collected by the wireless interference signal collection IO ports is provided in the touch button chip. It is used to perform subtraction operations and, before performing the subtraction operations, perform filtering processing and appropriate weighted scaling processing on the signals collected by the button IO ports and the signals collected by the wireless interference signal collection IO ports. Of course, without setting the hardware microcircuit, relevant signal processing algorithms integrated in the touch button chip can also perform subtraction operations on the signals collected by each of the button IO ports and the signals collected by the wireless interference signal collection IO port respectively, and before performing the subtraction operations, perform filtering processing and appropriate weighted scaling processing on the signals collected by the button IO ports and the signals collected by the wireless interference signal collection IO ports.

[0026] Combined Figure 5 As shown, the present invention detects or receives external radio-related interference by adding an internal channel, and the data on this internal channel represents part of the radio interference information. In actual use, corresponding subtraction operations are performed on the data of each external corresponding touch channel and the data of the internal channel, and the corresponding interference is subtracted, and finally the interference of the data part is reduced. Among them, after filtering and weighted scaling, subtraction operations are performed with the external channel. It is approximately considered that after a certain weighted scaling, the interference characteristics received by the internal channel and the external channel are the same, and they are similar to common-mode signals, and the common-mode interference is eliminated by taking the difference to achieve a differential effect.

[0027] The above embodiments are only for fully disclosing rather than limiting the present invention. Replacements of equivalent technical features that can be obtained without creative labor based on the creative concept of the present invention should be regarded as the scope disclosed in this application.

Claims

1. A touch button chip packaging structure for reducing wireless interference, comprising a packaging shell, a touch button chip encapsulated within the packaging shell, and touch button connection PINs provided on the packaging shell; the touch button connection PINs are connected to the preset button IO ports of the touch button chip; Characterized in that: An induction device for sensing wireless interference signals is further provided within the packaging shell, and the induction device is connected to the preset wireless interference signal acquisition IO port of the touch button chip; the touch button chip performs a subtraction operation on the signals collected by each of the button IO ports respectively and the signals collected by the wireless interference signal acquisition IO port to obtain button signals.

2. The touch button chip packaging structure according to claim 1, Characterized in that: The touch button connection PINs and the preset button IO ports of the touch button chip are connected by bonding wires of a metal or alloy conductor.

3. The touch button chip packaging structure according to claim 2, Characterized in that: The induction device and the preset wireless interference signal acquisition IO port of the touch button chip are connected by bonding wires of a metal or alloy conductor.

4. The touch button chip packaging structure according to claim 1, Characterized in that: The induction device is a metal coil, which is implemented using the top layer metal in the physical design of the touch button chip.

5. The touch button chip packaging structure according to claim 4, Characterized in that: The wireless interference signal acquisition IO port is an internal IO port of the touch button chip.

6. The touch button chip packaging structure according to any one of claims 1 to 3, Characterized in that: The induction device is a metal coil, which is independently arranged within the packaging shell and is independent of the touch button chip.

7. The touch button chip packaging structure according to claim 1, Characterized in that: A microcircuit for processing the signals collected by the button IO ports and the signals collected by the wireless interference signal acquisition IO port is provided within the touch button chip.

8. A signal processing method based on the packaging structure according to any one of claims 1-7, Comprising: The touch button chip acquires the signals collected by the button IO ports and the signals collected by the wireless interference signal acquisition IO port; The touch button chip performs a subtraction operation on the signals collected by each of the button IO ports respectively and the signals collected by the wireless interference signal acquisition IO port to obtain button signals.

9. The signal processing method according to claim 8, Characterized in that: The touch button chip performs the subtraction operation on the signals collected by each of the button IO ports respectively and the signals collected by the wireless interference signal acquisition IO port through the microcircuit provided therein or the signal processing algorithm integrated therein to obtain the button signals.

10. The signal processing method according to claim 9, Characterized in that: Before performing the subtraction operation, the microcircuit provided within the touch button chip or the signal processing algorithm integrated therein first performs filtering processing and appropriate weighted scaling processing on the signals collected by the button IO ports and the signals collected by the wireless interference signal acquisition IO port.

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