Datasheet

LARA-R2 series - Data Sheet
UBX-16005783 - R15 Interfaces Page 17 of 48
2.5.4 DDC (I
2
C) interface
☞ Communication with u-blox GNSS receivers over DDC (I
2
C) is not supported by LARA-R204-02B
and LARA-R211-02B product versions.
LARA-R2 series modules include an I
2
C-bus compatible DDC interface (SDA, SCL) available to
communicate with a u-blox GNSS receiver and with external I
2
C devices as an audio codec: the LARA-
R2 module acts as an I
2
C master which can communicate with I
2
C slaves in accordance with the I
2
C
bus specifications [17].
For more details regarding the DDC (I
2
C) interface usage and the integration with a u-blox GNSS
receiver, see the LARA-R2 series System Integration Manual [2], the GNSS Implementation
Application Note [4], and the I
2
C and GNSS AT commands description in the u-blox AT Commands
Manual [1].
2.5.5 SDIO interface
☞ The SDIO interface is not supported by the “02” and “62” module product versions.
LARA-R2 series modules include a 4-bit Secure Digital Input Output interface (SDIO_D0, SDIO_D1,
SDIO_D2, SDIO_D3, SDIO_CLK, SDIO_CMD) designed to communicate with external compatible
u-blox short range radio communication Wi-Fi modules.
2.6 Audio
☞ Audio is not supported by LARA-R204-02B and LARA-R220-62B module product versions.
LARA-R2 series modules support Voice over LTE (VoLTE) as well as Circuit-Switched Fall-Back (CSFB)
from LTE to 3G or 2G radio bearer for providing audio services.
LARA-R2 series modules include a 4-wire I
2
S digital audio interface (I2S_TXD, I2S_RXD, I2S_CLK,
I2S_WA) that can be configured by AT command in PCM mode (short synchronization signal) or in
normal I
2
S mode (long synchronization signal) to transfer digital audio data to/from an external device
as an audio codec.
For more details regarding internal audio processing system capabilities, I
2
S digital audio interface
possible configurations, usage and guideline for the integration with an external digital audio device
as an audio codec, see the LARA-R2 series System Integration Manual [2] and the audio sections in
the u-blox AT Commands Manual [1].
2.7 Clock output
LARA-R2 series modules provide master digital clock output functionality on the GPIO6 pin, which can
be configured to provide a 13 MHz or 26 MHz square wave. This is mainly designed to feed the master
clock input of an external audio codec, as the clock output can be configured in “Audio dependent”
mode (generating the square wave only when the audio path is active), or in “Continuous” mode.
For more details, see the u-blox AT Commands Manual [1], +UMCLK AT command.