ATWINC3400-Datasheet [PRELIMINARY DATASHEET]

Atmel-42396C-SmartConnect-ATWINC3400_Preliminary-Datasheet_07/2015

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9

External Interfaces

ATWINC3400 external interfaces include: SPI Slave, SDIO Slave, and UART for 802.11 control and data

Master for external EEPROM, and General Purpose Input/Output (GPIO) pins. With the exception of the SPI

Slave and SDIO Slave host interfaces, which are selected using the dedicated SDIO_SPI_CFG pin, the other

interfaces can be assigned to various pins by programming the corresponding pin muxing control register for

each pin to a specific value between 0 and 6.The default values of these registers are 0, which is GPIO mode.

Each digital I/O pin also has a programmable pull-up or pull-down. The summary of the available interfaces

and their corresponding pin mux settings is shown in Table 9-1. For specific programming instructions refer to

ATWINC3400 Programming Guide.

Table 9-1.

Pin-Mux Matrix of External Interfaces

Pin name

Pin #

Pull

Mux0

Mux1

Mux2

Mux3

Mux4

Mux5

Mux6

GPIO_38

9

Down

I_WAKEUP

GPIO_39

10

Up

I_WAKEUP

GPIO_40

11

Down

I_WAKEUP

GPIO_42

12

Down

GPIO_16

14

Up

GPIO_16

O_BT_UAR

T1_TXD

GPIO_15

15

Up

GPIO_15

I_BT_UART

1_RXD

GPIO_14

16

Up

GPIO_14

O_BT_UAR

T1_RTS

IO_I2C_SDA

I_WAKEUP

GPIO_13

17

Up

GPIO_13

I_BT_UART

1_CTS

IO_I2C_SCL

O_WIFI_UA

RT_TXD

I_WAKEUP

GPIO_3

20

Up

GPIO_3

O_SPI_SCK

_FLASH

O_BT_UAR

T2_TXD

GPIO_4

21

Up

GPIO_4

O_SPI_SSN

_FLASH

I_BT_UART

2_RXD

GPIO_5

22

Up

GPIO_5

O_SPI_TXD

_FLASH

O_WIFI_UA

RT_TXD

I_WAKEUP

GPIO_6

23

Up

GPIO_6

I_SPI_RXD_

FLASH

I_WIFI_UAR

T_RXD

I_WAKEUP

RTC_CLK

28

Up

GPIO_1

I_RTC_CLK

I_WIFI_UAR

T_RXD

O_WIFI_UA

RT_TXD

I_BT_UART

1_CTS

SD_CLK/GPI

O_8

29

Up

GPIO_8

I_SD_CLK

I_WIFI_UAR

T_RXD

I_BT_UART

1_CTS

SD_CMD/SP

I_SCK

30

Up

IO_SD_CM

D

IO_SPI_SC

K

SD_DAT0/S

PI_TXD

31

Up

IO_SD_DAT

0

O_SPI_TXD

SD_DAT1/S

PI_SSN

32

Up

IO_SD_DAT

1

IO_SPI_SS

N

SD_DAT2/S

PI_RXD

34

Up

IO_SD_DAT

2

I_SPI_RXD

SD_DAT3/G

PIO_7

35

Up

GPIO_7

IO_SD_DAT

3

O_WIFI_UA

RT_TXD

O_BT_UAR

T1_RTS

GPIO_17

36

Down

GPIO_17

I_WAKEUP

GPIO_18

37

Down

GPIO_18

I_WAKEUP

GPIO_19

38

Down

GPIO_19

I_WAKEUP