SARA-R404M datasheet(14/43 Pages) U-BLOX

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SARA-R4 series - Data sheet

UBX-16024152 - R18

Interfaces

Page 14 of 43

The USB_D+ / USB_D- lines carry the USB data and signaling, while the VUSB_DET pin represents the

input to enable the USB interface by applying an external valid USB VBUS voltage (5.0 V typical).

☞ The USB interface is available as an AT command / data communication interface only if an

external valid USB VBUS voltage (5.0 V typical) is applied at the VUSB_DET input of the module

since the switch-on of the module, and then held during normal operations. In this case, the UART

will not be available.

☞ If the USB interface is enabled, the module does not enter the low power deep sleep mode: the

external USB VBUS voltage needs to be removed from the VUSB_DET input of the module to let it

enter the Power Saving Mode defined in 3GPP Rel.13.

SARA-R4 series modules provide by default a set of two USB functions:



AT commands and data communication



Diagnostic log

For more details regarding USB configurations / capabilities, see the SARA-R4 series system

integration manual [2].

2.5.3 SPI interface

☞ The SPI interface is not supported by the “00”, “01”, “02”, “52”, “63” and “73” product versions.

SARA-R4 series modules include a Serial Peripheral Interface for communications with compatible

external device.

The SPI interface can be made available as an alternative function, in a mutually exclusive way, over

the digital audio interface pins (I2S_WA / SPI_MOSI, I2S_RXD / SPI_MISO, I2S_CLK / SPI_CLK,

I2S_TXD / SPI_CS).

2.5.4 SDIO interface

☞ The SDIO interface is not supported by “00”, “01”, “02”, “52”, “63” and “73” product versions.

SARA-R4 series modules include a 4-bit Secure Digital Input Output interface (SDIO_D0, SDIO_D1,

SDIO_D2, SDIO_D3, SDIO_CLK, and SDIO_CMD) designed to communicate with external compatible

SDIO devices.

2.5.5 DDC (I2C) interface

☞ The DDC (I2C) interface is not supported by the “00” and “01” product versions.

SARA-R4 series modules include an I2C-bus compatible DDC interface (SDA, SCL) available to

communicate with a u-blox GNSS receiver and with external I2C devices as for example an audio

codec: the SARA-R4 series module acts as an I2C master that can communicate with I2C slaves in

accordance with the I2C-bus specifications [12].

The SDA and SCL pins have internal pull-up to V_INT, so there is no need of additional pull-up resistors

on the external application board.

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