Integration Manual

TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R26 System description
Page 67 of 162
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), as (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 20.
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
+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)
* +90 °C for TOBY-L201-02S and MPCI-L201-02S product versions
** Module mounted on a 79 mm x 62 mm x 1.46 mm 4-Layers PCB with a high coverage of copper within climatic chamber
Table 20: Thresholds definition for Smart Temperature Supervisor
The sensor measures board temperature inside the shields, which can differ from ambient temperature.
1.15.15 SIM Access Profile (SAP)
Not supported by “00”, “01”, “02”, “60” and “62” product versions.
SIM access profile (SAP) feature allows cellular modules to access and use a remote (U)SIM card instead of the local
SIM card directly connected to the module (U)SIM interface.
The modules provide a dedicated USB SAP channel for communication with the remote (U)SIM card.
The communication between u-blox cellular modules and the remote SIM is conformed to client-server paradigm:
the module is the SAP client establishing a connection and performing data exchange to an SAP server directly
connected to the remote SIM that is used by the module for cellular network operations. The SAP communication
protocol is based on the SIM Access Profile Interoperability Specification [29].
u-blox cellular modules do not support SAP server role: the module acts as SAP client only.
A typical application using the SAP feature is the scenario where a device such as an embedded car-phone with
an integrated TOBY-L2 module uses a remote SIM included in an external user device (e.g. a simple SIM card reader
or a portable phone), which is brought into the car. The car-phone accesses the cellular network using the remote
SIM in the external device.
u-blox cellular modules, acting as an SAP client, can be connected to an SAP server by a completely wired
connection, as shown in Figure 30.