SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 System description Page 37 of 157
The SIM driver supports the PPS (Protocol and Parameter Selection) procedure for baud-rate selection,
according to the values determined by the SIM card or chip.
1.8.2 SIM detection interface
The GPIO5 pin is configured as an external interrupt to detect the SIM card mechanical / physical presence.
The pin is configured as input with an internal active pull-down enabled, and it can sense SIM card presence
only if cleanly connected to the mechanical switch of a SIM card holder as described in section 2.5:
Low logic level at GPIO5 input pin is recognized as SIM card not present
High logic level at GPIO5 input pin is recognized as SIM card present
For more details, see the SARA-R4/N4 series AT Commands Manual [2], +UGPIOC, +CIND and +CMER AT
commands.
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