User's Manual

Smart Machine Smart Decision

SIM7100A_User Manual_V1.01 2014-12-11

If these pins are configured for GPIOs, the sequence is listed in the following table.

Table 28: Keypad multiplexing function

Pin name Pin number Mode 0(default) Mode 1

KBR4 34 KBR4 GPIO6

KBR3 35 KBR3 GPIO7

KBR2 30 KBR2 GPIO8

KBR1 33 KBR1 GPIO9

KBR0 29 KBR0 GPIO10

KBC4 36 KBC4 GPIO11

KBC3 32 KBC3 GPIO12

KBC2 31 KBC2 GPIO13

KBC1 27 KBC1 GPIO14

KBC0 28 KBC0 GPIO15

Note: Refer to document [23] for detailed information of Keypad Application Note.

3.10 SPI Interface

SPI interface of SIM7100A is master only. It provides a duplex, synchronous, serial communication link

with peripheral devices. Its operation voltage is 1.8V, with clock rates up to 26 MHz.

3.10.1 SPI Pin Description

Table 29: SPI Pin description

Table 30: SPI Electronic characteristic

Symbol Parameter

Min Typ Max Unit

High-level input voltage

1.26 1.8 2.1 V

Pin name Pin No. Function

SPI_CS 9

SPI chip-select; not mandatory in a point-to-point connection

SPI_MISO 7 SPI master in/slave out data

SPI_CLK 6

SPI clock

SPI_MOSI 8 SPI master out/slave in data