SARA-R5 series - System integration manual
UBX-19041356 - R04 System description Page 38 of 118
C1-Public
1.9.4 SDIO interface
☞ The SDIO interface is not supported by the “00” product version of SARA-R5 series modules.
SARA-R5 series modules include a 1.8 V 4-bit Secure Digital Input Output interface over the SDIO_D0,
SDIO_D1, SDIO_D2, SDIO_D3, SDIO_CLK and SDIO_CMD pins, with the module acting as an SDIO
host, available for communications with compatible external SDIO devices, and for diagnostic
purpose.
1.9.5 DDC (I2C) interface
☞ Communication with an external GNSS receiver is not supported by SARA-R510M8S modules.
SARA-R5 series modules include a 1.8 V I2C-bus compatible DDC interface over the SDA and SCL pins,
available to communicate with an external u-blox GNSS receiver and with external I2C devices as for
example an audio codec: the SARA-R5 series module acts as an I2C master that can communicate
with I2C slaves in accordance with the I2C bus specifications [10].
The same 1.8 V I2C-bus compatible DDC interface is internally connected to the u-blox M8 GNSS
chipset integrated in SARA-R510M8S modules, as illustrated in Figure 4.
The SDA and SCL pins have internal active pull-up, so there is no need of additional pull-up resistors
on the external application board.
1.10 Audio
☞ Audio is not supported by “00” product version of SARA-R5 series modules.
SARA-R5 series modules include a 1.8 V I2S digital audio interface over the I2S_TXD, I2S_RXD,
I2S_CLK and I2S_WA pins for transferring digital audio data with an external compatible digital audio
device.
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