Ublox SARA-N210, System Integration Manual

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SARA-N2 series - System Integration Manual
UBX-17005143 - R06 System description Page 20 of 82
1.10 General Purpose Input/Output (GPIO)
SARA-N2 series modules provide the following pins:
 GPIO1 pin, working at the V_INT (1.8 V) voltage domain, supporting the Secondary UART data
output functionality (see section
1.9.2 and Table 8 )
 GPIO2 pin, working at the V_INT (1.8 V) voltage domain, not supported by "02" product versions

CTS pin, working at the VCC (3.6 V typical) voltage domain, supporting the Network status
indication and the RING indicator functionality (see section
1.9.1 and Table 8 )
For more details about how the pins can be configured, see SARA-N2 series AT Commands
Manual
[3] , +UGPIOC, +URING AT commands.
☞
Provide a test point connected to the GPIO1 pin for diagnostic purpose.
Function Description Default GPIO Configurable GPIOs
Network status indication Network status: registered home network,
registered roaming, data transmission, no
service -- CTS
RING indicator
Indicates an incoming message received by the
module or an URC event
-- CTS
Secondary UART Secondary UART data output for diagnostic
purpose, to capture diagnostic logs delivered
by the module GPIO1 GPIO1
Pin disabled
Tri-state with an internal active pull-down
enabled
CTS CTS
Table 8: GPIO custom functions configuration
1.11 Reserved pins (RSVD)
SARA-N2 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.