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Figure 28: I2C Reference Circuit
Note
：
SDA and SCL don't have pull up resistors in module. So, external pull up resistors are needed in
user application circuit. For more details about AT commands please refer to document [1].
3.9
Keypad Interface
SIM7100 module provides a keypad interface that supports five sense columns, and five keypad rows. The
interface generates an interrupt when any key is pressed. Its operation voltage is 1.8V.
3.9.1
Keypad Application Guide
A typical circuit about the keypad (5*5 keypad matrix) is shown in the following figure.
Figure 29: Keypad Reference Circuit
40
SIM7100_Hardware Design_V1.01
2015-01-20
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