Keyboard / button ESD protection
Solution：

Design description:
Protection application:
The keyboard of mobile phone and all kinds of buttons are very easy to produce ESD protector. Such circuits for low voltage DC switching, usually less than 5VDC.

Solution description:
There are 4 demonstration lines on the left, the actual application of the number of lines may be changed. In the example above, the use of the vertical multi - layer pressure - sensitive resistance, can be used to provide greater flexibility in the layout of the circuit board. An independent diode array is used in the example below to reduce the number of products.

Matching solutions:
In addition to the above recommendations, the TG product portfolio also provides other solutions. For example, according to the actual situation of the mobile phone, the use of a number of different channels (14 "" 2 lines) of the diode array.

Regulatory issues:
61000-4-2 IEC is the most suitable standard specification for this kind of circuit. The test can prove that the terminal product is not easy to be protected by ESD.

Characteristic: not applicable.

Application warning: not applicable.