SARA-G3 series - System Integration Manual
UBX-13000995 - R06 Objective Specification Appendix
Page 199 of 218
SPI interface
SARA-G3 and LISA-C2 modules do not provide an SPI interface such as is available on LISA-U
modules (5-wire IPC interface for AT command, data communication, MUX functionality, FW upgrade over
AT).
DDC (I
2
C) interface
The same compatible external circuit can be implemented for SARA-G350 and LISA series: A 1.8 V DDC
(I
2
C bus compatible) interface is provided to communicate with u-blox GNSS receivers.
SARA-G300, SARA-G310 and LISA-U200-00S modules do not support the DDC (I
2
C) interface.
LISA-C2 modules will support the DDC (I
2
C) interface in the upcoming firmware releases.
All LISA-U2 modules, except LISA-U200-00S, additionally support the communication with I
2
C slaves by
means of dedicated AT commands, other than u-blox positioning receivers over the same DDC (I
2
C)
interface.
A.4.6 Audio interfaces
Analog audio interfaces
Differential analog audio input is provided on the MIC_P / MIC_N pins of SARA-G350 modules (without
internal DC blocking capacitor) and LISA-C2 series, LISA-U120, and LISA-U130 modules (with an
internal DC blocking capacitor).
Supply output and local ground for an external microphone is provided on the MIC_BIAS / MIC_GND pins
of SARA-G350 modules only: the supply for an external microphone has to be provided by an external
LDO linear regulator with the other modules.
Differential analog audio output is provided on the SPK_P / SPK_N pins of SARA-G350, LISA-U120,
LISA-U130 modules (16 ohm load capable) and LISA-C2 series modules (32 ohm load capable).
SARA-G300/G310, LISA-U100/U110, LISA-U200-00S modules do not provide analog audio interfaces.
LISA-U2 series modules do not provide analog audio interfaces, but analog audio can be provided with
external audio codec connected to a digital audio interface of all LISA-U2 series modules except LISA-
U200-00S (e.g. the 4-wire I
2
S digital audio interface provided instead of the 4 analog audio pins). The
modules provide control of the external codec by means of the I
2
C interface and clock reference by means
of the CODEC_CLK pin.
For further details regarding analog audio interfaces characteristics, usage, and settings, refer to the
relevant module datasheet [1], [3], [4], [5], System Integration Manual 1.10.1, 2.6.1, [6], [7], and AT
commands manual [2], [8].
Digital audio interfaces
The digital audio interface is provided on the I2S_TXD, I2S_RXD, I2S_CLK, I2S_WA pins of SARA-G350
modules (1.8 V, PCM & Normal I2S modes, master, fixed sample rate) and LISA-U120/U130 and all
LISA-U2 series modules except LISA-U200-00S (1.8 V, PCM & Normal I2S modes, master & slave,
configurable sample rate). It is provided on the PCM_DO, PCM_DI, PCM_CLK, PCM_SYNC pins of
LISA-C2 series modules (1.8 V, PCM). The same compatible external circuit can be implemented
according to external digital audio device capabilities.
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