TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
System description
Page 65 of 164
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
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 14: 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
☞
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.
