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.
Function
Pin Name
Module
Pin No
I/O
Description
Remarks
Power
VCC
All
51, 52, 53 I
Module supply
input
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.
GND
All
1, 3, 5, 14,
20-22, 30,
32, 43, 50,
54, 55,
57-61,
63-96
N/A
Ground
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.
V_BCKP
All
2
I/O
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.
V_INT
All
4
O
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.
System
PWR_ON
All
15
I
Power-on input
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.
RESET_N
All
18
I
External reset
input
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.
EXT32K
SARA-G300
SARA-G310
31
I
32 kHz input
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.
32K_OUT
SARA-G300
SARA-G310
24
O
32 kHz output
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.
Antenna
ANT
All
56
I/O
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.
ANT_DET
SARA-G340
SARA-G350
SARA-U2
62
I
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.
