SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 System description Page 44 of 157
1.11 General Purpose Input/Output
SARA-R4/N4 series modules include six pins (GPIO1-GPIO6) which can be configured as General Purpose
Input/Output or to provide custom functions via u-blox AT commands (for more details see the SARA-
R4/N4 series AT Commands Manual [2], +UGPIOC, +UGPIOR, +UGPIOW AT commands), as summarized
in Table 8.
Network status indication
Network status: registered / data transmission, no service
Enable/disable the supply of a u-blox GNSS receiver
connected to the cellular module by the DDC (I2C)
interface
Sense when a u-blox GNSS receiver connected to the
module is ready for sending data by the DDC (I2C)
interface
SIM card physical presence detection
Module switched off or in PSM low power deep sleep
mode, versus active or connected mode
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO5, GPIO6
Input to trigger last gasp notification
Input to sense high or low digital level
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO5, GPIO6
Output to set the high or the low digital level
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
Tri-state with an internal active pull-down enabled
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO5, GPIO6
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO5, GPIO6
Table 8: SARA-R4/N4 series modules GPIO custom functions configuration
1.12 Reserved pins (RSVD)
SARA-R4/N4 series modules have pins reserved for future use, marked as RSVD.
All the RSVD pins are to be left unconnected on the application board, except for the RSVD pin number
33 that can be externally connected to ground.
Not supported by “00” and “01” product versions
Not supported by “00”, “01” and SARA-R410M-02B product versions
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