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SIM800_Hardware Design_V1.09 43 2016-06-30
Figure 39: Enhance the ESD performance of keypad circuit
Module can detect two buttons pressed synchronously at both the traditional and extended keypad connection,
but customer should notice that, do not assign keys which will be pressed at the same time on same KBC and
KBR when implement the extended keypad design. The following figure is an example to explain this situation,
“CTRL” and “A” can not be recognized if the two buttons were pressed at the same time.
Figure 40: Keypad detected
Table 20: Pin definition of the keypad interface
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