ATWILC3000 datasheet(21/40 Pages) ATMEL

21 / 40 page

ATWILC3000 Single Chip IEEE 802.11 b/g/n Link Controller with

Integrated Bluetooth 4.0 [DATASHEET]

Atmel-42390D-ATWILC3000-MUT-SmartConnect-Datasheet_05/2016

External Interfaces

ATWILC3000 external interfaces include: SPI Slave, SDIO Slave, and UART for 802.11 control and data

transfer; UART for Bluetooth control and data transfer, and audio; PCM for Bluetooth audio; I2C Slave for

control; SPI Master for external Flash; I2C 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 ATWILC3000 Programming Guide.

Table 9-1.

Pin-MUX Matrix of External Interfaces

Pin Name

Pin # Pull

MUX0

MUX1

MUX2

MUX3

MUX4

MUX5

MUX6

GPIO16

GPIO_16 O_BT_UART1_TXD

GPIO15

GPIO_15 I_BT_UART1_RXD

GPIO14

GPIO_14 O_BT_UART1_RTS

IO_I2C_SDA

I_WAKEUP

GPIO13

GPIO_13 I_BT_UART1_CTS

IO_I2C_SCL O_WIFI_UART_TXD

I_WAKEUP

GPIO3

GPIO_3

O_SPI_SCK_FLASH

O_BT_UART2_TXD

GPIO4

GPIO_4

O_SPI_SSN_FLASH

I_BT_UART2_RXD

GPIO5

GPIO_5

O_SPI_TXD_FLASH

O_WIFI_UART_TXD

I_WAKEUP

GPIO6

GPIO_6

I_SPI_RXD_FLASH

I_WIFI_UART_RXD

I_WAKEUP

RTC_CLK

GPIO_1

I_RTC_CLK

I_WIFI_UART_RXD

O_WIFI_UART_TXD

I_BT_UART1_CTS

SD_CLK

GPIO_8

I_SD_CLK

I_WIFI_UART_RXD

I_BT_UART1_CTS

SD_CMD/SPI_SCK

IO_SD_CMD

IO_SPI_SCK

SD_DAT0/SPI_TXD

IO_SD_DAT0

O_SPI_TXD

SD_DAT1/SPI_SSN

IO_SD_DAT1

IO_SPI_SSN

SD_DAT2/SPI_RXD

IO_SD_DAT2

I_SPI_RXD

SD_DAT3

GPIO_7

IO_SD_DAT3

O_WIFI_UART_TXD O_BT_UART1_RTS

GPIO17

Down

GPIO_17 IO_BT_PCM_CLK

I_WAKEUP

GPIO18

Down

GPIO_18 IO_BT_PCM_SYNC

I_WAKEUP

GPIO19

Down

GPIO_19 I_BT_PCM_D_IN

I_WAKEUP

GPIO20

Down

GPIO_20 O_BT_PCM_D_OUT

I_WAKEUP

IRQN

GPIO_2

O_IRQN

I_WIFI_UART_RXD

O_BT_UART1_RTS

GPIO21

GPIO_21 I_RTC_CLK

I_WIFI_UART_RXD

O_WIFI_UART_TXD

O_BT_UART1_RTS

IO_I2C_MASTER_SCL

HOST_WAKEUP

GPIO_0

I_WAKEUP

O_WIFI_UART_TXD

IO_I2C_MASTER_SDA

9.1

I2C Slave Interface

The I2C Slave interface, used primarily for control by the host processor, is a two-wire serial interface

consisting of a serial data line (SDA) on Pin 16 (GPIO14) and a serial clock line (SCL) on Pin 17 (GPIO13). I2C

Slave responds to the seven bit address value 0x60. The ATWILC3000 I2C supports I2C bus Version 2.1 -

2000 and can operate in standard mode (with data rates up to 100Kb/s) and fast mode (with data rates up to

400Kb/s).

The I2C Slave is a synchronous serial interface. The SDA line is a bidirectional signal and changes only while

the SCL line is low, except for STOP, START, and RESTART conditions. The output drivers are open-drain to

perform wire-AND functions on the bus. The maximum number of devices on the bus is limited by only the

maximum capacitance specification of 400pF. Data is transmitted in byte packages.

For specific information, refer to the Philips Specification entitled “The I2C -Bus Specification, Version 2.1”.

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