SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 Appendix
Page 196 of 217
LISA mounting option
with LISA paste mask
ANT pad
TOBY mounting option
with TOBY paste mask
ANT pad
SARA mounting option
with SARA paste mask
ANT pad ANT pad
LARA mounting option
with LARA paste mask
LISATOBY SARA LARA
Figure 98: Nested Design concept description: TOBY, LISA, SARA modules alternatively mounted on the same application board
The voltage level of all the digital interfaces of SARA and LISA modules is 1.8 V: this allows the direct connection
from a 1.8 V external device (e.g. application processor) to all the modules.
The following sections explain in detail all the points to consider during the migration between LISA and SARA
designs, implementing or not a nested design
For further details regarding SARA-G3 and LISA characteristics, usage, or settings, see the related module data
sheet [1], [4], [5], [6], system integration manual [7], [8], and the AT commands manual [3], [9].
A.2 Checklist for migration
Have you chosen the optimal SARA-G3 module?
For quad-band GSM/GPRS, full feature set, select the SARA-G350 module.
For dual-band GSM/GPRS, full feature set, select the SARA-G340 module.
For quad-band GSM/GPRS, reduced feature set, select the SARA-G310 module.
For dual-band GSM/GPRS, reduced feature set, select the SARA-G300 module.
Check SARA-G3 modules hardware requirements
Check power capabilities of the external supply circuit: SARA-G3 modules require large current pulses in
connected mode as well as LISA-U2 series modules when a 2G call is enabled. LISA-C2 series modules
do not require large current pulses due to the CDMA channel access technology.
Check supported bands for proper antenna circuit development: SARA-G3 modules frequency ranges
are within LISA-U2 modules ranges, but LISA-C2 modules range is quite different.
Check antenna detection requirements: SARA-G340 and SARA-G350 modules provide the antenna
detection function implementing an external application circuit between ANT_DET and ANT pins.
Check the module power-on requirements: Table 67 and relative section summarize differences
between SARA-G3 and LISA modules.
Check the module requirements to enter low power idle mode: SARA-G300 and SARA-G310 modules
require a 32 kHz signal at EXT32K input, which for example can be provided by the 32K_OUT output.
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