LISA-U1 series - System Integration Manual
3G.G2-HW-10002-3
Preliminary
System description
Page 79 of 125
The “Network status indication” mode can be provided only on one pin per time: it is not possible to
simultaneously set the same mode on another pin.
The pin configured to provide the “Network status indication” function is set as
o
Continuous Output / Low, if no service (no network coverage or not registered)
o
Cyclic Output / High for 100 ms, Output / Low for 2 s, if registered home 2G network
o
Cyclic Output / High for 50 ms, Output / Low for 50 ms, Output / High for 50 ms, Output / Low for
2 s, if registered home 3G network
o
Cyclic Output / High for 100 ms, Output / Low for 100 ms, Output / High for 100 ms, Output / Low
for 2 s, if registered visitor 2G network (roaming)
o
Cyclic Output / High for 50 ms, Output / Low for 50 ms, Output / High for 50 ms, Output / Low for
100 ms, if registered visitor 3G network (roaming)
o
Continuous Output / High, if voice or data 2G/3G call enabled
The pin configured to provide the “Network status indication” function can be connected on the application
board to an input pin of an application processor or can drive a LED by a transistor with integrated resistors
to indicate network status.
General purpose input
:
All the GPIOs (
GPIO1
,
GPIO2
,
GPIO3
,
GPIO4
and
GPIO5
) can be configured as input to sense high or low
digital level through AT+UGPIOR command, setting the parameter <gpio_mode> of AT+UGPIOC command
to 1.
The “General purpose input” mode can be provided on more than one pin per time: it is possible to
simultaneously set the same mode on another pin (also on all the GPIOs).
None GPIO pin is by default configured as “General purpose input”.
The pin configured to provide the “General purpose input” function is set as
o
Input, to sense high or low digital level by AT+UGPIOR command.
The pin can be connected on the application board to an output pin of an application processor to sense the
digital signal level.
General purpose output
:
All the GPIOs (
GPIO1
,
GPIO2
,
GPIO3
,
GPIO4
and
GPIO5
) can be configured as output to set the high or
the low digital level through AT+UGPIOW command, setting the parameter <gpio_mode> of +UGPIOC AT
command to 0.
The “General purpose output” mode can be provided on more than one pin per time: it is possible to
simultaneously set the same mode on another pin (also on all the GPIOs).
None GPIO pin is by default configured as “General purpose output”.
The pin configured to provide the “General purpose output” function is set as
o
Output / Low, if the parameter <gpio_out_val> of AT+UGPIOW command is set to 0
o
Output / High, if the parameter <gpio_out_val> of AT+UGPIOW command is set to 1
The pin can be connected on the application board to an input pin of an application processor to provide a
digital signal.
Pad disabled
:
All the GPIOs (
GPIO1
,
GPIO2
,
GPIO3
,
GPIO4
and
GPIO5
) can be configured in tri-state with an internal
active pull-down enabled, as a not used pin, setting the parameter <gpio_mode> of +UGPIOC AT command
to 255.
The “Pad disabled” mode can be provided on more than one pin per time: it is possible to simultaneously
set the same mode on another pin (also on all the GPIOs).
The pin configured to provide the “Pad disabled” function is set as
o
Tri-state with an internal active pull-down enabled
