Integration Manual

LISA-U2 series - System Integration Manual
UBX-13001118 - R25 Features description Page 155 of 182
Figure 73 shows the flow diagram implemented for the Smart Temperature Supervisor.
IF STS
enabled
Read
temperature
IF
(t
-1
<Ti<t
+1
)
IF
(t
-2
<Ti<t
+2
)
Send
notification
(warning)
Send
notification
(dangerous)
Wait emergency
call termination
IF
emerg.
call in
progress
Shut the device
down
Yes
No
Yes
Yes
No
No
No
Yes
Send
shutdown
notification
Feature enabled
(full logic or
indication only)
IF
Full Logic
Enabled
Feature disabled:
no action
Temperature is
within normal
operating range
Yes
Tempetature
is within
warning area
Tempetature is
outside valid
temperature range
No
Featuere enabled
in full logic mode
Feature enabled in
indication only mode:
no further actions
Send
notification
(safe)
Previously
outside of
Safe Area
Tempetature
is back to safe
area
No
No
further
actions
Yes
Figure 73: Smart Temperature Supervisor (STS) flow diagram
3.16.2 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.