LENA-R8 series - System integration manual
UBX-22015376 - R02
System description
Page 9 of 116
C1-Public
LENA-R8 series modules internally consist of the cellular modem system and the GNSS receiver
system (avaialble with LENA-R8001M10 modules only), as described herein with more details than
the simplified block diagrams of
Cellular modem system
The cellular modem system is composed of the following main elements:
•
RF section
o
Power amplifiers (PA) amplify the Tx signal modulated by the RF transceiver
o
RF switch connect the antenna port (
ANT
) to the suitable Tx / Rx path
o
SAW RF duplexers and RF filters separate the Tx and Rx signal paths and provide RF filtering
o
26 MHz crystal oscillator generates the clock reference in active mode or connected mode.
•
Baseband processor IC, integrating:
o
Microprocessor and DSP for control functions and digital processing
o
Memory system, which includes NOR flash and PSRAM
o
Dedicated peripheral blocks for control of the USB, SIM and generic digital interfaces
o
RF transceiver performs modulation, up-conversion of baseband signals for transmission,
down-conversion and demodulation of the RF signals for reception
•
Power management IC, integrating:
o
Voltage regulators to derive all the internal supply voltages from
VCC
module supply input
o
Voltage sources for external use:
VSIM
and
V_INT
o
Hardware power on, power off, reset
o
Low power modes support
GNSS receiver system (LENA-R8001M10 modules only)
The GNSS receiver system of LENA-R8001M10 modules is composed of the following main elements:
•
u-blox UBX-M10050-KB concurrent GNSS chipset with SPG 5.10 FW version
•
Dedicated supply main input (
VCC_GNSS
) and backup supply input (
VBCKP_GNSS
)
•
SAW filter in front of an additional Low Noise Amplifier (LNA), followed by another SAW filter
•
26 MHz Temperature-Controlled Crystal Oscillator (TCXO) for the GNSS reference clock
•
32 kHz crystal for the GNSS RTC
1.4
Pin-out
lists the pin-out of the LENA-R8 series modules, with pins grouped by function.
Function Pin name
Pin no.
I/O Description
Remarks
Cellular
Power
VCC
51,52,53
I
Cellular supply
input
VCC supply circuit affects the RF performance and
compliance of the device integrating the module with
applicable required certification schemes.
See section
for description and requirements.
See section
for external circuit design-in.
V_BCKP
2
I/O Cellular RTC supply
input/output
Cellular RTC domain supply input/output.
See section
for functional description.
See section
for external circuit design-in.
V_INT
4
O
Cellular Generic
Digital Interfaces
supply output
V_INT = 1.8 V (typ.), generated by internal linear regulator
when the module is switched on.
Test-Point for diagnostic access is recommended.
See section
for functional description.
See section
for external circuit design-in.
GND
1,3,5,14,20,
22,30,32,
43,50,54,55,
57,58,60,61,
63-96
N/A Ground
GND pins are internally connected to each other.
External ground connection affects the RF and thermal
performance of the device.
See section
for functional description.
See section
for external circuit design-in.
