SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 System description
Page 17 of 217
1.3 Pin-out
Table 3 lists the pin-out of the SARA-G3 and SARA-U2 series modules, with pins grouped by function.
VCC pins are internally connected to each other,
except for SARA-G3 modules product versions ‘02’
onwards.
VCC supply circuit affects the RF performance and
compliance of the device integrating the module
with applicable required certification schemes.
See section 1.5.1 for description and requirements.
See section 2.2.1 for external circuit design-in.
1, 3, 5, 14,
20-22, 30,
32, 43, 50,
54, 55,
57-61,
63-96
GND pins are internally connected to each other.
External ground connection affects the RF and
thermal performance of the device.
See section 1.5.1 for functional description.
See section 2.2.1 for external circuit design-in.
Real Time Clock
supply
input/output
V_BCKP = 2.3 V (typical) on SARA-G3 series.
V_BCKP = 1.8 V (typical) on SARA-U2 series.
V_BCKP is generated by internal low power linear
regulator when a valid VCC supply is present.
See section 1.5.2 for functional description.
See section 2.2.2 for external circuit design-in.
Generic Digital
Interfaces supply
output
V_INT = 1.8 V (typical), generated by internal DC/DC
regulator when the module is switched on.
Access by external test-point is recommended.
See section 1.5.3 for functional description.
See section 2.2.3 for external circuit design-in.
High input impedance: input voltage level must be
properly fixed, e.g. adding external pull-up.
Access by external test-point is recommended.
See section 1.6.1 for functional description.
See section 2.3.1 for external circuit design-in.
Internal 10 k pull-up to V_INT on SARA-G3,
Internal 10 k pull-up to V_BCKP on SARA-U2.
Access by external test-point is recommended.
See section 1.6.3 for functional description.
See section 2.3.2 for external circuit design-in.
Input for RTC reference clock, needed to enter the
low power idle mode and provide RTC functions.
See section 1.6.4 for functional description.
See section 2.3.3 for external circuit design-in.
32 kHz output suitable only to feed the EXT32K
input giving the RTC reference clock, allowing low
power idle mode and RTC function support.
See section 1.6.5 for functional description.
See section 2.3.3 for external circuit design-in.
RF input/output
for antenna
50 nominal characteristic impedance.
Antenna circuit affects the RF performance and
compliance of the device integrating the module
with applicable required certification schemes.
See section 1.7 for description and requirements.
See section 2.4 for external circuit design-in.
SARA-G340
SARA-G350
SARA-U2
Input for antenna
detection
ADC input for antenna detection function.
See section 1.7.2 for functional description.
See section 2.4.2 for external circuit design-in.
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