LENA-R8 series - System integration manual
UBX-22015376 - R02
System description
Page 30 of 116
C1-Public
1.15
GNSS power management
☞
LENA-R8001 modules do not include a GNSS receiver: GNSS power management is not available.
1.15.1
GNSS supply input (VCC_GNSS)
The
VCC_GNSS
pin is the main supply input for the GNSS system integrated in LENA-R8001M10
modules, providing power to the GNSS RF domains and internal LNA, the GNSS system core, the
GNSS digital peripheral I/O, the dedicated TCXO through an integrated LDO regulator, as is illustrated
in
Connecting an external DC power supply at the
VCC_GNSS
input is necessary for normal operations.
Voltage must be clean, stable, and tight at 1.8 V to properly supply the system with related parts.
During operation, the current drawn by the GNSS system may vary. For this reason, it is important
that the supply circuitry is able to support the peak power for a short time.
For more information about GNSS supply input, see the u-blox M10 standard precision GNSS chip
data sheet
1.15.2
GNSS backup supply input (VBCKP_GNSS)
The
VBCKP_GNSS
pin is the backup supply input for the GNSS system of the LENA-R8001M10
modules, designed to keep the GNSS backup RAM memory and the GNSS RTC alive in case of voltage
interruption at the main
VCC_GNSS
input pin.
Connecting an external DC power supply at the
VBCKP_GNSS
input is optional. If present, it enables
the hardware backup mode when the main
VCC_GNSS
supply is not present.
For more information about GNSS backup supply input, see the u-blox M10 standard precision GNSS
chip data sheet
1.16
GNSS antenna interface
☞
LENA-R8001 modules do not include a GNSS receiver: GNSS antenna interface is not available.
1.16.1
GNSS antenna RF interface (ANT_GNSS)
The
ANT_GNSS
pin represents the GNSS RF input of the LENA-R8001M10 modules, designed with
50
characteristic impedance and with an internal DC block, suitable for both active and/or passive
GNSS antennas due to the built-in SAW filter followed by an LNA followed by another SAW filter in
front of the integrated high performing u-blox M10 concurrent GNSS engine.
For more information about GNSS RF capabilities, see the u-blox M10 standard precision GNSS chip
data sheet
1.16.2
GNSS LNA or antenna on/off control (ANT_ON)
The
ANT_ON
output pin of LENA-R8001M10 modules is a 1.8 V peripheral output pin of the internal
u-blox M10 GNSS chipset, available to provide optional control for switching on/off the power supply
to an external active GNSS antenna or an external separate LNA as it controls at the same time the
internal LNA integrated in the module. This facility is provided to help minimize power consumption
in power save mode operation.
