User Manual

Smart Machine Smart Decision
SIM7100_Hardware_Design_V1.02 2015-06-16
needed in application circuit.
“AT+CRIIC and AT+CWIIC” AT commands could be used to read/write register values of the
I2C peripheral devices. For more details about AT commands please refer to document [1].
3.9 Keypad Interface
SIM7100 provides a keypad interface, which supports five sense columns, and five keypad rows.
The interface will generate a 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
3.10 SPI Interface
SIM7100 provides a SPI interface as a master only. Its operation voltage is 1.8V, and its clock rate
is up to 26 MHz.
Note ： For more details of the AT commands about the SPI, please refer to document [1].
3.11 Network status
The NETLIGHT pin is used to control Network Status LED, its reference circuit is shown in the
following figure.