User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R18 Advance Information System description
Page 16 of 206
Function Pin Name Module Pin No I/O Description Remarks
Auxiliary
UART
RXD_AUX
SARA-G3
28
O
Auxiliary UART
data output
1.8 V output, Circuit 104 (RXD) in ITU-T V.24,
for FW upgrade via EasyFlash tool and diagnostic.
AT command mode and GNSS tunneling
additionally
supported by product versions “02” onwards.
Access by external test-point is recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
TXD_AUX
SARA-G3
29
I
Auxiliary UART
data input
1.8 V input, Circuit 103 (TXD) in ITU-T V.24,
for FW upgrade via EasyFlash tool and diagnostic.
AT command mode and GNSS tunneling
additionally
supported by product versions “02” onwards.
Internal active pull-up to V_INT.
Access by external test-point is recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
USB
VUSB_DET
SARA-U2
17
I
USB detect input
High-Speed USB 2.0 interface input for VBUS (5 V typ)
USB supply sense. USB available for AT, data, GNSS
tunneling, SAP, FOAT, FW upgrade via EasyFlash tool,
diagnostic. Ethernet-over-USB
additionally supported
by product versions “x3” onwards.
Access by external test-point is recommended.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
USB_D-
SARA-U2
28
I/O
USB Data Line D-
High-Speed USB 2.0 interface data line for AT, data,
GNSS tunneling, SAP,
FOAT, FW upgrade via EasyFlash
tool, diagnostic. Ethernet-over-USB additionally
supported by product versions “x3” onwards.
90 : nominal differential impedance.
Pull-up, pull-
down and series resistors as required by
USB 2.0 specifications [14] are part of the USB pin
driver and need not be provided externally.
Access by external test-point is recommended.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
USB_D+
SARA-U2
29
I/O
USB Data Line D+
High-Speed USB 2.0 interface data line for AT, data,
GNSS tunneling, SAP, FOAT, FW upgrade via EasyFlash
tool, diagnostic. Ethernet-over-USB additionally
supported by product versions “x3” onwards.
90 : nominal differential impedance.
Pull-up, pull-
down and series resistors as required by
USB 2.0 specifications [14] are part of the USB pin
driver and need not be provided externally.
Access by external test-point is recommended.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
DDC
SCL
SARA-G340
SARA-G350
SARA-U2
27
O
I
2
C bus clock line
1.8 V open drain, for the 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.