SARA-G450 - System integration manual
UBX-18046432 - R08
System description
Page 11 of 143
C1-Public
Function
Pin Name Pin No
I/O Description
Remarks
Auxiliary
UART
RXD_AUX 19
O
AUX UART data
output
Circuit 104 (RxD) in ITU-T V.24, for AT command, data
and GNSS tunneling.
It operates at V_INT voltage level.
Test-Point recommended for diagnostic purpose.
See section
for functional description.
See section
for external circuit design-in.
TXD_AUX 17
I
AUX UART data
input
Circuit 103 (TxD) in ITU-T V.24, for AT command, data
and GNSS tunneling.
It operates at V_INT voltage level.
Test-Point recommended for diagnostic purpose.
See section
for functional description.
See section
for external circuit design-in.
Additional
UART
for FW
upgrade
and Trace
RXD_FT
28
O
FT UART data
output
Circuit 104 (RxD) in ITU-T V.24, for FW upgrade via
dedicated tool, and diagnostics.
It operates at 3 V voltage level during FW upgrade,
otherwise at V_INT voltage level.
Test-Point recommended for diagnostic purpose.
See section
for functional description.
See section
for external circuit design-in.
TXD_FT
29
I
FT UART data
input
Circuit 103 (TxD) in ITU-T V.24, for FW upgrade via
dedicated tool, and diagnostics.
It operates at 3 V voltage level during FW upgrade,
otherwise at V_INT voltage level.
Test-Point recommended for diagnostic purpose.
See section
for functional description.
See section
for external circuit design-in.
DDC
SCL
27
O
I2C bus clock line
Fixed open drain, for communication with u-blox
positioning modules / chips.
It operates at V_INT voltage level.
External pull-up required.
See section
for functional description.
See section
for external circuit design-in.
SDA
26
I/O I2C bus data line
Fixed open drain, for communication with u-blox
positioning modules / chips.
It operates at V_INT voltage level.
External pull-up required.
See section
for functional description.
See section
for external circuit design-in.
Analog
Audio
MIC_BIAS 46
O
Microphone supply
output
Supply output (1.7 typ.) for the external microphone.
See section
for functional description.
See section
for external circuit design-in.
MIC_GND 47
I
Microphone analog
reference
Local ground for the external microphone (reference
for the differential analog audio input).
See section
for functional description.
See section
for external circuit design-in.
MIC_N
48
I
Differential analog
audio input
(negative)
Differential analog audio signal input (negative).
No internal DC blocking capacitor.
See section
for functional description.
See section
for external circuit design-in.
MIC_P
49
I
Differential analog
audio input
(positive)
Differential analog audio signal input (positive).
No internal DC blocking capacitor.
See section
for functional description.
See section
for external circuit design-in.
