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Figure 40: 50 keys reference circuit
Note
：
Do not change the 20KOhm resistor in the diagram.
Customer could cascade a less than 1K resistor to enhance the ESD performance, the connection diagram is as
following:
Figure 41: Keypad reference circuit
Whether using a 5*5 keys or 5*5*2 keys, the module can also detecte the two buttons pressed. But when using a
5*5*2 button, the same row, column two buttons at the same time can not be detected when pressed, as shown
below:
Figure 42: Keypad detected
SIM800H_Hardware_Design_V1.01
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2013-08-20
Содержание SIM800H
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