SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R08
Objective Specification
Appendix
Page 170 of 188
A.3
Software migration
Software migration between SARA-G3 and LISA cellular modules is a straightforward procedure. Nevertheless
there are some differences to be considered with firmware version. Each cellular module supports AT commands
according to 3GPP standards:
TS 27.007
TS
27.005
TS
[13] and the u-blox AT command
extension. Backward compatibility has been maintained as far as possible.
For the complete list of supported AT commands and their syntax see the relevant AT commands manual
of the module [3], [9].
A.4
Hardware migration
SARA modules have been designed with backward compatibility to LISA series modules in mind but some minor
differences were unavoidable. These minor differences are however not relevant for the majority of the designs.
The following subsections describe the hardware differences between the interfaces of SARA-G3 modules and
LISA modules while Table 51 summarizes the detailed differences between the pins.
A.4.1
Supply interfaces
Module supply input (VCC)
The same compatible external circuit can be implemented for SARA and LISA modules even if there are minor
differences in the
VCC
input voltage ranges and some differences in the current consumption figures.
The voltage provided must be within the normal operating range limits to allow module switch-on and must be
above the minimum limit of the extended operating range to avoid module switch-off. For the detailed
VCC
input voltage ranges values see Table 51 or to the relative datasheet of the module [1], [4], [5], [6].
The SARA-G3 maximum average current consumption is lower than the LISA one due to the lower data rate or
the different channel access technology. SARA-G3 modules require large current pulses in connected-mode as
well as LISA-U series when a 2G call is enabled. LISA-C2 series do not require large current pulses due to the
CDMA channel access technology. For the detailed current consumption values see the related module
datasheet [1], [4], [5], [6].
Detailed supply circuit design-in guidelines are reported in section 2.2.1 and in the corresponding System
Integration Manual of the module [7], [8].
RTC supply input/output (V_BCKP)
The same compatible external circuit can be implemented for SARA and LISA-U series even if there are minor
differences in the
V_BCKP
typical output voltage and input voltage range as reported in Table 51 or in the
relative datasheet of the module [1], [4], [5], [6]. LISA-C2 series do not provide
V_BCKP
RTC supply input/output
as well as the whole RTC functionality.
Interfaces supply output (V_INT)
The same compatible external circuit can be implemented for SARA and LISA series: there are no differences in
the
V_INT
output characteristics.
