SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26
System description
Page 20 of 217
Function
Pin Name
Module
Pin No
I/O
Description
Remarks
DDC
SCL
SARA-G340
SARA-G350
SARA-U2
27
O
I
2
C bus clock line
1.8 V open drain, for communication with the
u-blox positioning modules / chips. Communication
with other external I
2
C-slave devices as an audio
codec is additionally supported by SARA-U2 series.
External pull-up required.
See section 1.9.4 for functional description.
See section 2.6.4 for external circuit design-in.
SDA
SARA-G340
SARA-G350
SARA-U2
26
I/O
I
2
C bus data line
1.8 V open drain, for the communication with
u-blox positioning modules / chips. Communication
with other external I
2
C-slave devices as an audio
codec is additionally supported by SARA-U2 series.
External pull-up required.
See section 1.9.4 for functional description.
See section 2.6.4 for external circuit design-in.
Analog
Audio
MIC_BIAS
SARA-G340
SARA-G350
46
O
Microphone
supply output
Supply output (2.2 V typ) for external microphone.
See section 1.10.1 for functional description.
See section 2.7.1 for external circuit design-in.
MIC_GND
SARA-G340
SARA-G350
47
I
Microphone
analog reference
Local ground for the external microphone (reference
for the analog audio uplink path).
See section 1.10.1 for functional description.
See section 2.7.1 for external circuit design-in.
MIC_N
SARA-G340
SARA-G350
48
I
Differential
analog audio
input (negative)
Differential analog audio signal input (negative)
shared for all the analog uplink path modes:
handset, headset, hands-free mode.
No internal DC blocking capacitor.
See section 1.10.1 for functional description.
See section 2.7.1 for external circuit design-in.
MIC_P
SARA-G340
SARA-G350
49
I
Differential
analog audio
input (positive)
Differential analog audio signal input (positive)
shared for all the analog uplink path modes:
handset, headset, hands-free mode.
No internal DC blocking capacitor.
See section 1.10.1 for functional description.
See section 2.7.1 for external circuit design-in.
SPK_P
SARA-G340
SARA-G350
44
O
Differential
analog audio
output (positive)
Differential analog audio signal output (positive)
shared for all the analog downlink path modes:
earpiece, headset and loudspeaker mode.
See section 1.10.1 for functional description.
See section 2.7.1 for external circuit design-in.
SPK_N
SARA-G340
SARA-G350
45
O
Differential
analog audio
output (negative)
Differential analog audio signal output (negative)
shared for all the analog downlink path modes:
earpiece, headset and loudspeaker mode.
See section 1.10.1 for functional description.
See section 2.7.1 for external circuit design-in.
Digital
Audio
I2S_CLK
SARA-G340
SARA-G350
SARA-U2
36
O /
I/O
I
2
S clock /
GPIO
1.8 V serial clock for PCM / normal I
2
S modes.
Pin configurable also as GPIO on SARA-U2 series.
Access by external test-point is recommended.
See section 1.10.2 for functional description.
See section 2.7.2 for external circuit design-in.
I2S_RXD
SARA-G340
SARA-G350
SARA-U2
37
I /
I/O
I
2
S receive data /
GPIO
1.8 V data input for PCM / normal I
2
S modes.
Pin configurable also as GPIO on SARA-U2 series.
Internal active pull-down to GND.
Access by external test-point is recommended.
See section 1.10.2 for functional description.
See section 2.7.2 for external circuit design-in.
