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1.8.3
Cellular antenna dynamic tuning interface (RFCTRL1 / RFCTRL2)
☞
Cellular antenna dynamic tuner interface support is planned for future firmware versions.
LENA-R8 series modules' cellular system includes 2 output pins (RFCTRL1 / RFCTRL2) for real time
control of an external antenna tuning IC according to the actual cellular band used by the module.
These pins, paired with an external antenna tuner IC or RF switch, can be used to:
•
tune antenna impedance to reduce power losses due to mismatch
•
tune antenna aperture to improve total antenna efficiency
•
select the optimal antenna for each operating band
1.9 Cellular SIM interface
1.9.1
Cellular SIM card / chip interface
LENA-R8 series modules provide a high-speed SIM/ME interface, including automatic detection and
configuration of the voltage required by the connected SIM card or chip.
Both 1.8 V and 3 V SIM types are supported: activation and deactivation with an automatic voltage
switch from 1.8 V to 3 V is implemented, according to the ISO-IEC 7816-3 specifications.
The VSIM supply output pin provides internal short circuit protection to limit the start-up current and
protect the device in short circuit situations.
1.9.2
Cellular SIM card detection interface
The GPIO5 pin is configured by default to detect the external SIM card mechanical / physical presence.
The pin is configured as input, and it can sense SIM card presence as intended to be properly
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
1.10 Cellular serial communication interfaces
LENA-R8 series modules provide the following serial communication interfaces:
•
Main primary UART: serial interface available for the communication with a host application
processor, supporting AT and data communication, multiplexer functionality, and FW update by
means of FOAT (see section 1.10.1.1).
•
Auxiliary secondary UART interface: serial interface available for the communication with a host
application processor, supporting AT and data communication, and GNSS tunneling (see section
1.10.1.2).
•
USB: Universal Serial Bus 2.0 compliant interface available for the communication with a host
application processor, supporting AT and data communication, GNSS tunneling, FW update by
means of the FOAT, FW update by means of dedicated tool, and diagnostics (see section 1.10.2).
•
I2C interface: I2C-bus compliant interface available for the communication with external u-blox
GNSS chips or modules (LARA-R8001 only), and with external I2C devices as an audio codec (see
section 1.10.3).
UBX-22015376 - R02
C1-Public
LENA-R8 series - System integration manual
System description
Page 25 of 116
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