SARA-G3 series - System Integration Manual
UBX-13000995 - R06
Objective Specification
System description
Page 83 of 218
1.13.8.2
Threshold definitions
When the module application operates at extreme temperatures with Smart Temperature Supervisor enabled,
the user should note that outside the valid temperature range the device automatically shuts down as
described above.
The input for the algorithm is always the temperature measured within the wireless module (Ti, internal).
This value can be higher than the working ambient temperature (Ta, ambient), since (for example)
during transmission at maximum power a significant fraction of DC input power is dissipated as heat. This
behavior is partially compensated by the definition of the upper shutdown threshold (t
+2
) that is slightly
higher than the declared environmental temperature limit.
defines the temperature thresholds.
Symbol
Parameter
Temperature
Remarks
t
-2
Low temperature shutdown
–40 °C
Equal to the absolute minimum temperature rating for the wireless
module (the lower limit of the extended temperature range)
t
-1
Low temperature warning
–30 °C
10 °C above t
-2
t
+1
High temperature warning
+85 °C
10 °C below t
+2
. The higher warning area for upper range
ensures that any countermeasures used to limit the thermal
heating will become effective, even considering some thermal
inertia of the complete assembly.
t
+2
High temperature shutdown
+95 °C
Equal to the internal temperature Ti measured in the worst case
operating condition at typical supply voltage when the ambient
temperature Ta in the reference setup (*) equals the absolute
maximum temperature rating (upper limit of the extended
temperature range)
(*) SARA-G3 series module mounted on a 79 mm x 62 mm x 1.41 mm 4-Layers PCB with a high coverage of copper in still
air conditions
Table 12: Thresholds definition for Smart Temperature Supervisor on the SARA-G3 series modules
The sensor measures board temperature inside the shields, which can differ from ambient
temperature.
1.13.9
AssistNow clients and GNSS integration
Not supported by SARA-G300 and SARA-G310 modules.
For customers using u-blox GNSS receivers, SARA-G350 modules feature embedded AssistNow clients.
AssistNow A-GPS provides better GNSS performance and faster Time-To-First-Fix. The clients can be
enabled and disabled with an AT command (see the
u-blox AT Commands Manual [2]).
SARA-G350 modules act as a stand-alone AssistNow client, making AssistNow available with no additional
requirements for resources or software integration on an external host micro controller. Full access to u-
blox positioning receivers is available via the SARA-G350 modules, through a dedicated DDC (I
2
C)
interface, while the available GPIOs can handle the positioning chipset / module power-on/off. This means
that the wireless module and the positioning chips and modules can be controlled through a single serial
port from any host processor.
