LISA-U2 series - System Integration Manual
UBX-13001118 - R19
Early Production Information
Features description
Page 151 of 175
3.15.2
Threshold Definitions
When the application of cellular module operates at extreme temperatures with Smart Temperature Supervisor
enabled, the user should note that outside the valid temperature range the device will automatically shut down
as described above.
The input for the algorithm is always the temperature measured within the cellular 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.
The temperature thresholds are defined according the Table 60.
Symbol
Parameter
Temperature
Remarks
t
-2
Low temperature shutdown
–40 °C
Equal to the absolute minimum temperature rating for the cellular
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
+77 °C
20°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
+97 °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)
(*)LISA-U2 module mounted on a 90 mm x 70 mm x 1.46 mm 4-Layers PCB with a high coverage of copper within climatic chamber
Table 60: Thresholds definition for Smart Temperature Supervisor on the LISA-U2 modules
The sensor measures board temperature inside the shields, which can differ from ambient temperature.
3.16
Bearer Independent Protocol
Not supported by "01", "x2" and "68" product versions.
The Bearer Independent Protocol is a mechanism by which a cellular module provides a SIM with access to the
data bearers supported by the network. With the Bearer Independent Protocol (BIP) for Over-the-Air SIM
provisioning, the data transfer from and to the SIM uses either an already active PDP context or a new PDP
context established with the APN provided by the SIM card.
For more details, see the
3.17
Multi-Level Precedence and Pre-emption Service
Not supported by "01", "x2" and "68" product versions.
The Multi-Level Precedence and Pre-emption Service (eMLPP) permits to handle the call priority. The maximum
priority associated to a user is set in the SIM: within this threshold, the user can assign different priorities to the
calls. This results in a differentiated treatment of the calls by the network in case of abnormal events such as
handovers to congested cells.
For more details, see the
