3.4.8 Wireless M.2 Interface

The SAM9X75-Curiosity board embeds an M.2 connector to interconnect with Wireless modules.

M.2 (formerly known as NGFF) is a small form factor card and connector that supports applications such as Wi-Fi, WLAN, USB, PCIe and SATA, as defined in the PCI-SIG M.2 Specification.

The default interface used with the Wireless Module solution is the SDIO. However, the Wireless module can be controlled in SPI mode and configuration can be performed manually by the end user.

The interface is based on a 67-pin connector and includes clock, SDIO/SPI interface, USART Interface, wake-up/interrupt, reset and power lines.

The following figure shows the M.2 Wireless module interface.

Figure 3-32. M.2 Wireless Module Interface

The following table shows the M.2 Wireless module interface signal description.

Table 3-17. M.2 Wireless Module Interface Signal Description
Pin No.	PIO	Signal Name	Signal Description
1, 7, 18, 33, 39, 45, 51, 57, 63, 69, 75	–	GND	Ground
2, 4, 72, 74	–	VDD_3V3_B	3.3V
9	PA11	SDMMC1_CK	SDIO Clock Input
11	PA10 or PA11	SDMMC1_CMD or FXCOM4_IO2 SPI CLK	SDIO Command or SPI Clock Input
13	PA9	SDMMC1_DAT0	SDIO Data 0 or SPI MISO
15	PA6 or PA13	SDMMC1_DAT1 or FXCOM4_IO4 SPI CS	SDIO Data 1 or SPI Chip Select (CS)
17	PA7 or PA10	SDMMC1_DAT2 or FXCOM4_IO0 SPI MOSI	SDIO Data 2 or SPI MOSI
19	PA8	SDMMC1_DAT3	SDIO Data 3
21	WKUP0 or PC17	WKUP or IRQN	Wake host (interrupt) or Output (UART/SPI/SDIO)
22	PA15	FLEXCOM5_IO1_RXD	UART Rx connected to Bluetooth UART TxD Output
32	PA16	FLEXCOM5_IO0_TXD	UART Tx connected to Bluetooth UART RxD Input
34	PA14	FLEXCOM5_IO3_CTS	UART CTS connected to Bluetooth UART RTS Output
36	PA30	FLEXCOM5_IO4_RTS	UART RTS connected to Bluetooth UART CTS Input
38	–	MODE_SELECT_1/DFU_RX	Mode Select Input 1 of the M.2 Interface configuration
40	PC16	WIRELESS_WAKE	Wake Wireless Device Input
42	–	MODE_SELECT_2/DFU_TX	Mode Select Input 2 of the M.2 Interface configuration
44	–	MBUS_1_COEX_PTA_BT-PRIORITY	PTA Bluetooth Priority Input
46	–	MBUS_1_COEX_PTA_WLAN-ACTIVE	PTA Wireless LAN Active Output
48	–	MBUS_1_COEX_PTA_BT-ACTIVE	PTA Bluetooth Priority Input
50	–	XIN32.768K	32.768 kHz clock module input
54	NRST or PC25	NRST or NRST_OUT	Reset
58	PA24	M.2_I²C_DATA	TWI Data
60	PA25	M.2_I²C_CLK	TWI Clock
62	PC31	M.2_INT	TWI interrupt