User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R18 Advance Information System description
Page 17 of 206
Function Pin Name Module Pin No I/O Description Remarks
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.
I2S_TXD
SARA-G340
SARA-G350
SARA-U2
35
O /
I/O
I
2
S transmit data /
GPIO
1.8 V data output 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_WA
SARA-G340
SARA-G350
SARA-U2
34
O /
I/O
I
2
S word alignment /
GPIO
1.8 V word alignment 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.
CODEC_CLK
SARA-U2
19
O
Clock output
1.8 V master clock output for external audio codec
See section 1.10.2 for functional description.
See section 2.7.2 for external circuit design-in