Ublox LENA-R8 Series Quick setup guide

UBX-22015376 - R02
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LENA-R8 series
Multi-mode LTE Cat 1bis modules
System integration manual
Abstract
This document describes the features and integration guidelines for the LENA-R8 series modules.
With 14 LTE bands and four GSM/GPRS bands, these modules offer universal network connectivity
and global coverage. The integrated GNSS receiver based on the u-blox M10 platform make the
modules ideal for demanding global tracking and telematic applications, enabling simpler, smaller
devices with uncompromised GNSS performance. Connectivity and location services are supported
and offer customer simple and efficient solution for cloud-based services such as CaaS and LaaS.

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Document information
Title
LENA-R8 series
Subtitle
Multi-mode LTE Cat 1bis modules
Document type
System integration manual
Document number
UBX-22015376
Revision and date
R02
04-Oct-2022
Disclosure restriction
C1-Public
Product status
Corresponding content status
Functional sample
Draft
For functional testing. Revised and supplementary data will be published later.
In development /
Prototype
Objective specification
Target values. Revised and supplementary data will be published later.
Engineering sample
Advance information
Data based on early testing. Revised and supplementary data will be published later.
Initial production
Early production information
Data from product verification. Revised and supplementary data may be published later.
Mass production /
End of life
Production information
Document contains the final product specification.
This document applies to the following products:
Product name
Type number
Modem version
Application version
PCN reference
Product status
LENA-R8001
LENA-R8001-00C
02.00
A01.07
UBX-22035617
Engineering sample
LENA-R8001M10
LENA-R8001M10-00C
N/A
N/A
N/A
Functional sample
u-blox or third parties may hold intellectual property rights in the products, names, logos and designs included in this document.
Copying, reproduction, modification or disclosure to third parties of this document or any part thereof is only permitted with the
express written permission of u-blox.
The information contained herein is provided “as is” and u-blox assumes no liability for its use. No warranty, either express or
implied, is given, including but not limited to, with respect to the accuracy, correctness, reliability and fitness for a particular
purpose of the information. This document may be revised by u-blox at any time without notice. For the most recent documents,
visit www.u-blox.com.
Copyright © u-blox AG.

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Contents
Document information................................................................................................................................2
Contents ..........................................................................................................................................................3
1System description...............................................................................................................................6
1.1 Overview........................................................................................................................................................6
1.2 Product features .........................................................................................................................................6
1.3 Architecture .................................................................................................................................................8
1.4 Pin-out ...........................................................................................................................................................9
1.5 Operating modes.......................................................................................................................................13
1.5.1 Overview..........................................................................................................................................13
1.5.2 Cellular operating modes ............................................................................................................14
1.5.3 GNSS operating modes ...............................................................................................................14
1.6 Cellular power management...................................................................................................................16
1.6.1 Cellular supply input (VCC) .........................................................................................................16
1.6.2 Cellular RTC supply input / output (V_BCKP)..........................................................................20
1.6.3 Cellular generic digital interfaces supply output (V_INT).....................................................20
1.7 Cellular system function interfaces......................................................................................................20
1.7.1 Cellular system power-on............................................................................................................20
1.7.2 Cellular system power-off ...........................................................................................................21
1.7.3 Cellular system reset ...................................................................................................................23
1.8 Cellular antenna interface.......................................................................................................................23
1.8.1 Cellular antenna RF interface (ANT).........................................................................................23
1.8.2 Cellular antenna detection (ANT_DET) ....................................................................................24
1.8.3 Cellular antenna dynamic tuning interface (RFCTRL1 / RFCTRL2)...................................25
1.9 Cellular SIM interface...............................................................................................................................25
1.9.1 Cellular SIM card / chip interface...............................................................................................25
1.9.2 Cellular SIM card detection interface .......................................................................................25
1.10Cellular serial communication interfaces ............................................................................................25
1.10.1 Cellular UART interfaces .............................................................................................................26
1.10.2 Cellular USB interface ..................................................................................................................27
1.10.3 Cellular I2C interface....................................................................................................................28
1.11Cellular audio interface ............................................................................................................................29
1.12Cellular clock output.................................................................................................................................29
1.13Cellular General Purpose Input/Output (GPIO)....................................................................................29
1.14Reserved pins (RSVD) ..............................................................................................................................29
1.15GNSS power management......................................................................................................................30
1.15.1 GNSS supply input (VCC_GNSS) ...............................................................................................30
1.15.2 GNSS backup supply input (VBCKP_GNSS)............................................................................30
1.16GNSS antenna interface..........................................................................................................................30
1.16.1 GNSS antenna RF interface (ANT_GNSS)...............................................................................30
1.16.2 GNSS LNA or antenna on/off control (ANT_ON) ....................................................................30

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1.17 GNSS serial communication interface .................................................................................................31
1.17.1 GNSS UART interface ..................................................................................................................31
1.18GNSS Peripheral Input/Output...............................................................................................................31
2Design-in................................................................................................................................................ 32
2.1 Overview......................................................................................................................................................32
2.2 Cellular power management...................................................................................................................33
2.2.1 Cellular supply input (VCC) .........................................................................................................33
2.2.2 Cellular RTC supply (V_BCKP) ....................................................................................................47
2.2.3 Cellular interface supply output (V_INT)..................................................................................48
2.3 Cellular system functions interfaces....................................................................................................49
2.3.1 Cellular power-on (PWR_ON)......................................................................................................49
2.3.2 Cellular reset (RESET_N).............................................................................................................49
2.4 Antenna interfaces...................................................................................................................................50
2.4.1 General guidelines for antenna interfaces ..............................................................................50
2.4.2 Cellular antenna RF interface (ANT).........................................................................................54
2.4.3 GNSS antenna RF interface (ANT_GNSS)...............................................................................58
2.4.4 Cellular and GNSS RF coexistence ............................................................................................62
2.4.5 Cellular antenna detection interface (ANT_DET) ..................................................................64
2.4.6 Cellular antenna dynamic tuning interface (RFCTRL1 / RFCTRL2)...................................66
2.5 Cellular SIM interface...............................................................................................................................67
2.6 Cellular serial communication interfaces ............................................................................................74
2.6.1 Cellular UART interfaces .............................................................................................................74
2.6.2 Cellular USB interface ..................................................................................................................79
2.6.3 Cellular I2C interface ....................................................................................................................81
2.7 Cellular audio interface ............................................................................................................................84
2.7.1 Cellular digital audio interface....................................................................................................84
2.8 Cellular General Purpose Input/Output (GPIO)....................................................................................87
2.9 Reserved pins (RSVD) ..............................................................................................................................88
2.10GNSS power management......................................................................................................................88
2.10.1 GNSS supply input (VCC_GNSS) ...............................................................................................88
2.10.2 GNSS backup supply input (VBCKP_GNSS)............................................................................89
2.11GNSS serial communication interface .................................................................................................90
2.11.1 GNSS UART interface ..................................................................................................................90
2.12GNSS Peripheral Input/Output...............................................................................................................90
2.13Module placement ....................................................................................................................................91
2.14Module footprint and paste mask .........................................................................................................92
2.15Thermal guidelines ...................................................................................................................................93
2.16Schematic for LENA-R8 series module integration...........................................................................94
2.17Design-in checklist....................................................................................................................................96
2.17.1 Schematic checklist .....................................................................................................................96
2.17.2 Layout checklist ............................................................................................................................97
2.17.3 Antenna checklist .........................................................................................................................97

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3Handling and soldering ..................................................................................................................... 98
3.1 Packaging, shipping, storage, and moisture preconditioning .........................................................98
3.2 Handling ......................................................................................................................................................98
3.3 Soldering .....................................................................................................................................................99
3.3.1 Soldering paste .............................................................................................................................99
3.3.2 Reflow soldering............................................................................................................................99
3.3.3 Optical inspection ...................................................................................................................... 100
3.3.4 Cleaning ....................................................................................................................................... 100
3.3.5 Repeated reflow soldering ....................................................................................................... 101
3.3.6 Wave soldering ........................................................................................................................... 101
3.3.7 Hand soldering............................................................................................................................ 101
3.3.8 Rework.......................................................................................................................................... 101
3.3.9 Conformal coating ..................................................................................................................... 101
3.3.10 Casting......................................................................................................................................... 101
3.3.11 Grounding metal covers............................................................................................................ 102
3.3.12 Use of ultrasonic processes..................................................................................................... 102
4Approvals.............................................................................................................................................103
4.1 Product certification approval overview............................................................................................ 103
4.2 US Federal Communications Commission notice........................................................................... 104
4.2.1 Safety warnings review the structure ................................................................................... 104
4.2.2 Declaration of conformity ........................................................................................................ 104
4.2.3 Modifications .............................................................................................................................. 104
4.3 Innovation, Science, Economic Development Canada notice ....................................................... 105
4.3.1 Declaration of Conformity........................................................................................................ 105
4.3.2 Modifications .............................................................................................................................. 105
4.4 European Conformance CE mark ....................................................................................................... 107
4.5 UK Conformity Assessed (UKCA) ....................................................................................................... 108
5Product testing .................................................................................................................................109
5.1 Validation testing and qualification ................................................................................................... 109
5.2 Production testing ................................................................................................................................. 110
5.2.1 u-blox in-series production test.............................................................................................. 110
5.2.2 Production test parameters for OEM manufacturers ....................................................... 110
Appendix .....................................................................................................................................................112
AMigration from LARA to LENA-R8 modules ............................................................................112
BGlossary ...............................................................................................................................................112
Related documentation .........................................................................................................................116
Revision history........................................................................................................................................116
Contact........................................................................................................................................................116

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1System description
1.1 Overview
LENA-R8 series modules offer simple global LTE Cat 1bis connectivity with fourteen LTE bands and
four 2G bands in the small LENA LGA form-factor (30 x 27 mm, 100-pin), which is easy to integrate in
compact designs, reducing logistics complexity for IoT devices that may be deployed in different
regions requiring different band combinations.
The module series is ideal for value-oriented IoT products, targeting the tracking and telematics
markets or other applications requiring broad global coverage. With broad band support and fallback
to 2G networks, the modules provide the best possible roaming coverage and make global tracking
with a single product SKU possible.
LENA-R8 series modules are highly integrated, providing out-of-the box support for MQTT Anywhere
and MQTT Flex services on the Thingstream platform, enabling seamless global roaming.
The modules can enable a wide range of applications with GNSS positioning requirements, ranging
from high performance stand-alone solutions to a simple out-of-box experience via LENA-R8001M10.
This product variant includes integrated GNSS receiver based on the u-blox M10 platform, supporting
concurrent reception of four GNSS (GPS, GLONASS, Galileo, BeiDou). The cellular modem and GNSS
subsystems are accessible via dedicated interfaces for large usage flexibility. Both subsystems can
be operated fully independently, facilitating the optimization of usage patterns to achieve the highest
performances with the most efficient power consumption.
The modules also support CellLocate, a network-based cellular location service.
LENA-R8 series modules are small in size and pin-compatible with other u-blox form factors, thereby
simplifying migration to LTE Cat 1bis from legacy 2G or 3G technologies, which are sunsetting.
1.2 Product features
Model
Region
Radio Access Technology
GNSS
u-blox
services
Interfaces
Features
Grade
LTE Category
LTE FDD bands
LTE TDD bands
UMTS/HSPA bands
GSM/GPRS bands
Internal GNSS receiver
External GNSS control via modem
IoT Security -as-a-Service
MQTT Anywhere / MQTT Flex
AssistNow software
CellLocate®
UART
USB 2.0
I2C
GPIOs
Digital audio
Root of Trust
Secure boot / update
Embedded MQTT / MQTT-SN
TCP/IP, UDP/IP, HTTP/FTP
TSL/DTLS
Dual stack IPv4 / IPv6
FOAT / FOTA
LwM2M
3GPP Power Saving Mode
eDRX
Last gasp
Jamming detection
Antenna and SIM detection
Antenna dynamic tuning
Rx Diversity
VoLTE
CSFB
Standard
Professional
Automotive
LENA-R8001
Global
1bis
1,2,3,4,5,7,8
12,20,28,66
38
40,41
Quad
●
●
●
●
2
1
1
5
●
●
●
●
●
●
●
○
○
●
●
○
○
●
●
LENA-R8001M10
Global
1bis
1,2,3,4,5,7,8
12,20,28,66
38
40,41
Quad
●
●
●
●
2
1
1
5
●
●
●
●
●
●
●
○
○
●
●
○
○
●
●
●= supported by initial and future product FW versions ○= support planned for future product FW versions
Table 1: LENA-R8 series main features summary

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LENA-R8 series modules include 2 variants:
•The LENA-R8001 modules, integrating a cellular system supporting multi-band LTE Cat 1bis and
2G radio access technologies for global deployments
•The LENA-R8001M10 modules, integrating the same multi-band LTE Cat 1bis and 2G cellular
system of LENA-R8001 modules plus a GNSS system based on the ultra-low-power u-blox M10
standard precision concurrent GNSS receiver. As illustrated in Figure 2, the cellullar and the GNSS
are independent subsystems of the module, internally interconnected by dedicated I2C interface,
with separate supply inputs and separate accessible interfaces for greatflexibility of use.
The modules provide Voice over LTE (VoLTE)
1
and Circuit-Switched-Fall-Back (CSFB) audio capability.
4G LTE
2G GSM/GPRS
GNSS (LENA-R8001M10 only)
3GPP Release 13 LTE Frequency and
Time Division Duplex (FDD/TDD)
General Packet Radio Service (GPRS)
Time Division Multiple Access (TDMA)
u-blox M10 standard precision receiver with
concurrent reception of up to four GNSS
LTE bands:
•FDD band 12 (700 MHz)
•FDD band 28 (700 MHz)
•FDD band 20 (800 MHz)
•FDD band 5 (850 MHz)
•FDD band 8 (900 MHz)
•FDD band 4 (1700 MHz)
•FDD band 66 (1700 MHz)
•FDD band 3 (1800 MHz)
•FDD band 2 (1900 MHz)
•FDD band 1 (2100 MHz)
•FDD band 7 (2600 MHz)
•TDD band 40 (2300 MHz)
•TDD band 41 (2600 MHz)
•TDD band 38 (2600 MHz)
GSM/GPRS bands:
•GSM 850
•E-GSM 900
•DCS 1800
•PCS 1900
GNSS signals:
•GPS / QZSS L1C/A (1575.42 MHz)
•Galileo E1-B/C (1575.42 MHz)
•GLONASS L1OF (1602 MHz +
k*562.5 kHz, k = –7,..., 5, 6)
•BeiDou B1I (1561.098 MHz),
B1C (1575.42 MHz)
LTE Power Class
•Power Class 3 (23 dBm)
GSM/GPRS (GMSK) Power Class
•Class 4 (33 dBm) for low bands
•Class 1 (30 dBm) for high bands
Protocols:
•UBX u-blox proprietary
•NMEA 2.1, 2.3, 4.0, 4.10 (default), 4.11
Data rate
•LTE category 1bis:
up to 10.3 Mbit/s DL,
up to 5.2 Mbit/s UL
Data rate
•GPRS multi-slot class 122:
up to 85.6 kbit/s DL,
up to 85.6 kbit/s UL
Assisted GNSS services:
•AssistNow Online
•AssistNow Offline
•AssistNow Autonomous
Table 2: LENA-R8 series LTE, 2G and GNSS characteristics summary
1
VoLTE support planned for future firmware versions
2
GPRS multi-slot class 12 implies a maximum of 4 slots in DL (reception), 4 slots in UL (transmission) with 5 slots in total.

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1.3 Architecture
Figure 1 summarizes the internal architecture of the LENA-R8001 modules.
UARTs
USB
VCC
V_BCKP
RF
Transceiver
Flash
Memory
Base Band
Processor
26 MHz
32 kHz
V_INT
PWR_ON
RESET_N
SIM
I2C
Digital Audio
GPIOs
Antenna Tuner
USB boot
Power
Management
ANT_DET
ANT
Power
Amplifiers
Duplexer
Filters
Switch
Power
Amplifiers
Filters
Filters
Filters
Figure 1: LENA-R8001 modules simplified block diagram
Figure 2 summarizes the internal architecture of the LENA-R8001M10 modules.
ANT_GNSS
UARTs
USB
LNA UBX-M10050
LNA_EN
RF_IN
V_BCKP 26 MHz
VCC
RTC VIO_SEL
EXTINT
TIMEPULSE
TCXO
ANT_ON
Time-Pulse
Ext-Int
Tx-Ready
I2C
UART UART_GNSS
V_BCKP
VBCKP_GNSS
VCC_GNSS
LDO_X_OUT
RF
Transceiver
32 kHz
V_CORE V_IO
V_RF
Flash
Memory
Base Band
Processor
26 MHz
32 kHz
V_INT
PWR_ON
RESET_N
SIM
I2C
Digital Audio
GPIOs
Antenna Tuner
USB boot
Power
Management
GNSS
System
Cellular
System
ANT_DET
ANT
Power
Amplifiers
Duplexer
Filters
Switch
Power
Amplifiers
Filters
Filters
Filters
SAW SAW
Figure 2: LENA-R8001M10 modules simplified block diagram
☞The “00C” product versions of the LENA-R8 series modules (meaning the LENA-R8001-00C and
the LENA-R8001M10-00C versions) do not support the antenna tuner interface on the RFCTRL1
and RFCTRL2 pins, which are intended to be left unconnected

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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 Figure 1 and Figure 2.
Cellular modem system
The cellular modem system is composed of the following main elements:
•RF section
oPower amplifiers (PA) amplify the Tx signal modulated by the RF transceiver
oRF switch connect the antenna port (ANT) to the suitable Tx / Rx path
oSAW RF duplexers and RF filters separate the Tx and Rx signal paths and provide RF filtering
o26 MHz crystal oscillator generates the clock reference in active mode or connected mode.
•Baseband processor IC, integrating:
oMicroprocessor and DSP for control functions and digital processing
oMemory system, which includes NOR flash and PSRAM
oDedicated peripheral blocks for control of the USB, SIM and generic digital interfaces
oRF transceiver performs modulation, up-conversion of baseband signals for transmission,
down-conversion and demodulation of the RF signals for reception
•Power management IC, integrating:
oVoltage regulators to derive all the internal supply voltages from VCC module supply input
oVoltage sources for external use: VSIM and V_INT
oHardware power on, power off, reset
oLow 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
Table 3 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 1.6.1 for description and requirements.
See section 2.2.1 for external circuit design-in.
V_BCKP
2
I/O
Cellular RTC supply
input/output
Cellular RTC domain supply input/output.
See section 1.6.2 for functional description.
See section 2.2.2 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 1.6.3 for functional description.
See section 2.2.3 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 1.6.1 for functional description.
See section 2.2.1 for external circuit design-in.

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Function
Pin name
Pin no.
I/O
Description
Remarks
GNSS
Power
VCC_GNSS
99
I
GNSS supply input
LENA-R8001M10 only.
GNSS supply input.
See section 1.15.1 for functional description.
See section 2.10.1 for external circuit design-in.
Internally not connected on LENA-R8001.
VBCKP_GNSS
100
I
GNSS backup
supply input
LENA-R8001M10 only.
GNSS backup supply input.
See section 1.15.2 for functional description.
See section 2.10.2 for external circuit design-in.
Internally not connected on LENA-R8001.
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 1.6.1 for functional description.
See section 2.2.1 for external circuit design-in.
Cellular
System
Control
PWR_ON
15
I
Cellular Power-on
input
Internal pull-up to VCC.
Test-Point for diagnostic access is recommended.
See section 1.7.1 for functional description.
See section 2.3.1 for external circuit design-in.
RESET_N
18
I
Cellular External
reset input
Internal pull-up to VCC.
Test-Point for diagnostic access is recommended.
See section 1.7.3 for functional description.
See section 2.3.2 for external circuit design-in.
Antenna
ANT
56
I/O
RF input/output for
cellular Tx/Rx
antenna
50 nominal characteristic impedance.
Antenna circuit affects the RF performance and
compliance of the device integrating the module with
applicable required certification schemes.
See section 1.8 for description and requirements.
See section 2.4 / 2.4.2 for external circuit design-in.
ANT_DET
59
I
Input for cellular
antenna detection
ADC for antenna presence detection function.
See section 1.8.2 for functional description.
See section 2.4.5 for external circuit design-in.
ANT_GNSS
31
I
RF input for GNSS
Rx antenna
LENA-R8001M10 only. RF input for GNSS Rx antenna,
50 Ωnominal impedance.
See section 1.16.1 for description and requirements.
See section 2.4 / 2.4.3 / 2.4.4 for external circuit design-in.
Internally not connected on LENA-R8001
ANT_ON
44
O
GNSS antenna
enable
LENA-R8001M10 only. GNSS peripheral output with
external GNSS active antenna control and/or external LNA
on/off control function, connected to internal LNA.
See section 1.16.2 for description and requirements.
See section 2.4.3 for external circuit design-in.
Internally not connected on LENA-R8001.
Cellular
SIM
VSIM
41
O
Cellular SIM supply
output
VSIM = 1.8 V / 3 V output as per the connected SIM type.
See section 1.9 for functional description.
See section 2.5 for external circuit design-in.
SIM_IO
39
I/O
Cellular SIM data
Internal pull-up to VSIM.
See section 1.9 for functional description.
See section 2.5 for external circuit design-in.
SIM_CLK
38
O
Cellular SIM clock
See section 1.9 for functional description.
See section 2.5 for external circuit design-in.
SIM_RST
40
O
Cellular SIM reset
See section 1.9 for functional description.
See section 2.5 for external circuit design-in.

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Function
Pin name
Pin no.
I/O
Description
Remarks
Cellular
UART
RXD
13
O
Cellular UART data
output
1.8 V output, UART Circuit 104 (RXD) per ITU-T V.24,
supporting AT and data, FOAT, Multiplexer.
Test-Point and series 0 for diagnostic to be considered.
See section 1.10.1.1 for functional description.
See section 2.6.1 for external circuit design-in.
TXD
12
I
Cellular UART data
input
1.8 V input, UART Circuit 103 (TXD) per ITU-T V.24,
supporting AT and data, FOAT, Multiplexer.
Internal active pull-up to V_INT.
Test-Point and series 0 for diagnostic to be considered.
See section 1.10.1.1 for functional description.
See section 2.6.1 for external circuit design-in.
CTS
11
O
Cellular UART clear
to send output
1.8 V output, UART Circuit 106 (CTS) per ITU-T V.24.
See section 1.10.1.1 for functional description.
See section 2.6.1 for external circuit design-in.
RTS
10
I
Cellular UART ready
to send input
1.8 V input, UART Circuit 105 (RTS) per ITU-T V.24.
Internal active pull-up to V_INT.
See section 1.10.1.1 for functional description.
See section 2.6.1 for external circuit design-in.
DSR
6
O
Cellular UART data
set ready output
1.8 V output, UART Circuit 107 (DSR) per ITU-T V.24.
Alternatively configurable as AUX UART RTS input.
See section 1.10.1.1 for functional description.
See section 2.6.1 for external circuit design-in.
RI
7
O
Cellular UART ring
indicator output
1.8 V output, UART Circuit 125 (RI) per ITU-T V.24.
Alternatively configurable as AUX UART CTS output.
See section 1.10.1.1 for functional description.
See section 2.6.1 for external circuit design-in.
DTR
9
I
Cellular UART data
terminal ready
input
1.8 V input, UART Circuit 108/2 (DTR) per ITU-T V.24.
Internal active pull-up to V_INT.
Alternatively configurable as AUX UART data input.
See section 1.10.1.1 for functional description.
See section 2.6.1 for external circuit design-in.
DCD
8
O
Cellular UART data
carrier detect
output
1.8 V input, UART Circuit 109 (DCD) per ITU-T V.24.
Alternatively configurable as AUX UART data output.
See section 1.10.1.1 for functional description.
See section 2.6.1 for external circuit design-in.
Cellular
Auxiliary
UART
DCD
8
O
Cellular AUX UART
data output
1.8 V output, AUX UART Circuit 104 (RXD) per ITU-T V.24,
supporting AT, data communication and GNSS tunneling.
The second auxiliary UART interface is disabled by
default, and it can be enabled by +USIO AT command.
See section 1.10.1.2 for functional description.
See section 2.6.1 for external circuit design-in.
DTR
9
I
Cellular AUX UART
data input
1.8 V input, AUX UART Circuit 103 (TXD) per ITU-T V.24,
supporting AT, data communication and GNSS tunneling.
Internal active pull-up to V_INT.
The second auxiliary UART interface is disabled by
default, and it can be enabled by +USIO AT command.
See section 1.10.1.2 for functional description.
See section 2.6.1 for external circuit design-in.
RI
7
O
Cellular AUX UART
clear to send output
1.8 V output, AUX UART Circuit 106 (CTS) per ITU-T V.24.
See section 1.10.1.2 for functional description.
See section 2.6.1 for external circuit design-in.
DSR
6
I
Cellular AUX UART
ready to send input
1.8 V input, AUX UART Circuit 105 (RTS) per ITU-T V.24.
Internal active pull-up to V_INT.
See section 1.10.1.2 for functional description.
See section 2.6.1 for external circuit design-in.

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Function
Pin name
Pin no.
I/O
Description
Remarks
GNSS
UART
TXD_GNSS
47
O
GNSS UART data
output
LENA-R8001M10 only. GNSS UART data output.
See section 1.17.1 for functional description.
See section 2.11.1 for external circuit design-in.
Internally not connected on LENA-R8001.
RXD_GNSS
48
I
GNSS UART data
input
LENA-R8001M10 only. GNSS UART data input.
See section 1.17.1 for functional description.
See section 2.11.1 for external circuit design-in.
Internally not connected on LENA-R8001.
Cellular
USB
VUSB_DET
17
I
Cellular USB detect
input
VBUS (5 V typ) must be connected to this pin during the
switch-on boot sequence of the module to enable the USB
interface, supporting AT / data communication, FOAT,
FW update by dedicated tool, diagnostic.
Test-Point for diagnostic / FW update very recommended
See section 1.10.2 for functional description.
See section 2.6.2 for external circuit design-in.
USB_D-
28
I/O
USB Data Line D-
USB interface supporting AT / data communication, FOAT,
GNSS tunneling, FW update by dedicated tool, diagnostic.
90 nominal differential impedance (Z0)
30 nominal common mode impedance (ZCM)
Pull-up or pull-down resistors and external series resistors
as required by the USB 2.0 specifications [11] are part of
the USB pin driver and need not be provided externally.
Test-Point for diagnostic / FW update very recommended
See section 1.10.2 for functional description.
See section 2.6.2 for external circuit design-in.
USB_D+
29
I/O
USB Data Line D+
USB interface supporting AT / data communication, FOAT,
GNSS tunneling, FW update by dedicated tool, diagnostic.
90 nominal differential impedance (Z0)
30 nominal common mode impedance (ZCM)
Pull-up or pull-down resistors and external series resistors
as required by the USB 2.0 specifications [11] are part of
the USB pin driver and need not be provided externally.
Test-Point for diagnostic / FW update very recommended
See section 1.10.2 for functional description.
See section 2.6.2 for external circuit design-in.
USB_BOOT
33
I
Cellular USB boot
Input to force FW update over cellular USB.
Test-Point for FW update very recommended.
See section 1.10.2 for functional description.
See section 2.6.2 for external circuit design-in.
Cellular
I2C
SCL
27
O
Cellular I2C clock
1.8 V open drain, for communication with external u-blox
GNSS chips / modules, and other I2C devices.
Internal 20 kactive pull-up to V_INT.
See section 1.10.3 for functional description.
See section 2.6.3 for external circuit design-in.
SDA
26
I/O
Cellular I2C data
1.8 V open drain, for communication with external u-blox
GNSS chips / modules, and other I2C devices.
Internal 20 kactive pull-up to V_INT.
See section 1.10.3 for functional description.
See section 2.6.3 for external circuit design-in.
Cellular
Audio
I2S_TXD
35
O
Cellular I2S
transmit data
Digital audio data output.
See sections 1.11 for functional description.
See sections 2.7 for external circuit design-in.
I2S_RXD
37
I
Cellular I2S receive
data
Digital audio data input.
See sections 1.11 for functional description.
See sections 2.7 for external circuit design-in.

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Function
Pin name
Pin no.
I/O
Description
Remarks
I2S_CLK
36
I
Cellular I2S bit clock
Digital audio bit clock.
See sections 1.11 for functional description.
See sections 2.7 for external circuit design-in.
I2S_WA
34
I
Cellular I2S word
alignment
Digital audio word alignment synchronization signal.
See sections 1.11 for functional description.
See sections 2.7 for external circuit design-in.
Clock
output
GPIO6
19
O
Cellular Clock
output
1.8 V clock output.
See section 1.12 for functional description.
See section 2.7 for external circuit design-in.
Cellular
GPIOs
GPIO1
16
I/O
Cellular GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.13 for functional description.
See section 2.8 for external circuit design-in.
GPIO2
23
I/O
Cellular GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.13 for functional description.
See section 2.8 for external circuit design-in.
GPIO3
24
I/O
Cellular GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.13 for functional description.
See section 2.8 for external circuit design-in.
GPIO4
25
I/O
Cellular GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.13 for functional description.
See section 2.8 for external circuit design-in.
GPIO5
42
I/O
Cellular GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.13 for functional description.
See section 2.8 for external circuit design-in.
GNSS
PIOs
TIMEPULSE
45
O
GNSS time pulse
LENA-R8001M10 only. GNSS time pulse output function.
See section 1.18 for functional description.
See section 2.12 for external circuit design-in.
Internally not connected on LENA-R8001.
EXTINT
46
I
GNSS external
interrupt
LENA-R8001M10 only. GNSS external interrupt function.
See section 1.18 for functional description.
See section 2.12 for external circuit design-in.
Internally not connected on LENA-R8001.
Cellular
Antenna
tuning
RFCTRL1
97
O
Cellular dynamic
antenna tuner
control output
Function not supported by current product versions.
See section 1.8.3 for functional description.
See section 2.4.6 for external circuit design-in.
RFCTRL2
98
O
Cellular dynamic
antenna tuner
control output
Function not supported by current product versions.
See section 1.8.3 for functional description.
See section 2.4.6 for external circuit design-in.
Reserved
RSVD
21, 49, 62
N/A
RESERVED pin
Pin reserved for future use. Internally not connected.
See sections 1.14 and 2.9
Table 3: LENA-R8 series modules pin definition, grouped by function
1.5 Operating modes
1.5.1 Overview
LENA-R8 series modules include 2 variants: the LENA-R8001 modules, integrating a cellular system,
and the LENA-R8001M10 modules, integrating the same cellular system of LENA-R8001 modules
plus a GNSS system based on the ultra-low-power u-blox M10 GNSS receiver.
As illustrated in Figure 2, the cellullar and the GNSS are completely independent subsystems of the
LENA-R8001M10 modules, internally interconnected by dedicated I2C interface, with separate
supply inputs and separate accessible interfaces for great usage flexibility, as each of the two
subsystems can be operated fully independently.

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1.5.2 Cellular operating modes
The cellular system of LENA-R8 series modules have several operating modes defined in Table 4.
General status
Operating mode
Definition
Power-down
Not-powered mode
VCC supply not present or below operating range: module is switched off.
Power-off mode
VCC supply within operating range and module is switched off.
Normal Operation
Idle mode
Module processor runs at the minimum frequency to save power consumption.
Active mode
Module processor runs at normal operating frequency to enable related functions.
Connected mode
RF Tx/Rx enabled with processor running at related operating frequency.
Table 4: Module operating modes definition
The initial operating mode of LENA-R8 series modules cellular system has the VCC supply not present
or below the operating range: the modules are switched off in not-powered mode.
Once a valid VCC supply is applied to LENA-R8 series modules’cellular system, it remains switched
off in the power-off mode. Then the proper toggling of the PWR_ON input line is necessary to trigger
the switch-on routine of the modules that subsequently enter the active mode.
LENA-R8 series modules cellular system is ready to operate when in active mode. The available
communication interfaces are ready, the cellular system can accept and respond to AT commands,
entering connected mode upon cellular RF signal reception / transmission.
LENA-R8 series modules cellular system switch from active mode to the low power idle mode
whenever possible, if the low power configuration is enabled by the +UPSV AT command. The low
power idle mode can last for different time periods according to the specific +UPSV AT command
setting, according to the DRX setting, and according to the concurrent activities executed.
LENA-R8 series modules cellular system can be gracefully switched off by the +CPWROFF AT
command, or by proper toggling of the PWR_ON input line.
Remove VCC
Switch ON:
•PWR_ON
Not powered
Power off
Switch OFF:
•AT+CPWROFF
•PWR_ON
Apply VCC
Incoming/outgoing data, or
other dedicatednetwork communication
No RF Tx/Rx in progress,
Communication dropped
ActiveConnected
If low power idle mode is enabled (AT+UPSV≠0),
low power idle mode is entered whenever possible
Idle
Low power idle mode exit
when requested
Figure 3: LENA-R8 series modules operating modes transitions
1.5.3 GNSS operating modes
☞LENA-R8001 modules do not include a GNSS receiver: GNSS operating modes are not available.
The GNSS system of LENA-R8001M10 modules, based on u-blox UBX-M10050-KB GNSS receiver,
supports different operating modes. These modes represent strategies of controlling the acquisition
and tracking engines to optimize performance and power consumption.

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1.5.3.1 GNSS continuous mode
The UBX-M10050-KB GNSS receiver uses dedicated signal processing engines optimized for signal
acquisition and tracking. The acquisition engine actively searches for and acquires signals during cold
starts or when insufficient signals are available during navigation. The tracking engine continuously
tracks and downloads all the almanac data and acquires new signals as they become available during
navigation. The tracking engine consumes less power than the acquisition engine.
The current consumption is lower when a valid position is obtained quickly after the start of the
receiver navigation, the entire almanac has been downloaded, and the ephemeris for each satellite in
view is valid. If these conditions are not met, the search for the available satellites takes more time
and consumes more power.
☞For further details about GNSS continuous mode, see the u-blox UBX-M10050-KB integration
manual [4] and the u-blox M10 SPG 5.10 interface description [5].
1.5.3.2 GNSS power save mode
Power Save Mode (PSM) allows a reduction in the GNSS system power consumption by selectively
switching parts of the receiver on and off. Power Save Mode (PSM) has two modes of operation:
•Power Save Mode Cyclic Tracking (PSMCT) operation is used when position fixes are required in
short periods of 0.5 s to 10 s.
•Power Save Mode On/Off (PSMOO) operation is used for periods longer than 10 s, and can be in
the order of minutes, hours, or days.
The mode of operation can be configured, and depending on the setting, the receiver demonstrates
different behavior: In on/off operation the receiver switches between phases of startup/navigation
and phases with low or almost no system activity (backup/sleep). In cyclic tracking the receiver does
not shut down completely between fixes, but uses low-power tracking instead.
☞BeiDou B1C is not supported in power save mode.
GPS, GLONASS, BeiDou B1I, Galileo and QZSS signals are supported in power save mode. BeiDou B1C
signal is not supported. The receiver is unable to download or process any SBAS data in GNSS power
save mode and it is therefore recommended to disable SBAS.
☞For further details about GNSS power save mode (operation, acquisition, cyclic tracking, on/off
mode, external control, configuration, satellite data download), see the u-blox UBX-M10050-KB
integration manual [4] and the u-blox M10 SPG 5.10 interface description [5].
1.5.3.3 GNSS backup mode
A backup mode is an inactive state where the power consumption is reduced to a fraction of that in
operating modes. The receiver maintains time information and navigation data to speed up the
receiver restart after backup or standby mode.
LENA-R8001M10 GNSS system supports hardware backup mode and software standby mode.
GNSS hardware backup mode
The hardware backup mode allows entering a backup state and resuming operation by switching the
power supplies on and off. The receiver automatically enters the hardware backup mode if the
VCC_GNSS is removed. The hardware backup mode always requires an independent backup battery.
VBCKP_GNSS must be supplied to maintain the backup domain (BBR and RTC) to allow better TTFF,
accuracy, availability, and power consumption at the next startup. As V_IO is not supplied, the PIOs
cannot be driven by an external host processor. If driving of the PIOs cannot be avoided, buffers are
required for isolating the PIOs.

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GNSS software standby mode
Software standby mode allows control over the backup state with the command UBX-RXM-PMREQ.
VCC_GNSS must be supplied, however V_CORE / V_RF supply is internally disabled. The internal V_IO
supply maintains the BBR, RTC, and PIOs.
Entering the software standby mode clears the RAM memory including the receiver configuration. To
maintain the configuration, store it on both RAM and battery-backed RAM (BBR) layers. Configuration
in OTP memory is always maintained.
The software standby mode can be set for a specific duration, or until the receiver is woken up by a
signal at a wake-up source defined in UBX-RXM-PMREQ. Possible wake-up source is the EXTINT pin.
See the u-blox M10 SPG 5.10 interface description [5] for more info on UBX-RXM-PMREQ message.
As the internal V_IO is supplied, the PIOs can be driven by an external host processor. No buffers are
required for isolating the PIOs, which reduces cost.
☞The "force" flag must be set in UBX-RXM-PMREQ to enter software standby mode.
☞VBCKP_GNSS should be left open if not used
☞For further details about GNSS backup mode, see the UBX-M10050-KB integration manual [4] and
the u-blox M10 SPG 5.10 interface description [5].
1.6 Cellular power management
1.6.1 Cellular supply input (VCC)
The cellular system of the LENA-R8 series modules must be supplied via the three VCC pins that
represent the cellular system power supply input.
The VCC pins are internally connected to the RF power amplifier and to the integrated Power
Management Unit: all supply voltages needed by the module are generated from the VCC supply by
integrated voltage regulators, including the V_INT supply for generic digital interfaces (as the UARTs,
I2C, I2S, GPIOs) and the VSIM supply for the SIM interface.
During operation, the current drawn by the LENA-R8 series modules through the VCC pins can vary
by several orders of magnitude. This ranges from the pulse of current consumption during GSM
transmitting bursts at maximum power level in connected mode (as described in section 1.6.1.3) to
the low current consumption during the low power idle mode (as described in section 1.6.1.4).
LENA-R8 series modules provide separate supply inputs over the three VCC pins:
•VCC pins #52 and #53 represent the supply input for the internal RF power amplifier, demanding
most of the total current drawn when RF transmission is enabled during a voice/data call
•VCC pin #51 represents the supply input for the internal baseband Power Management Unit and
the internal transceiver, demanding minor part of the total current drawn
Figure 4 provides a simplified block diagram of LENA-R8 series modules internal VCC supply routing.
53
VCC
52
VCC
51
VCC
LENA-R8 series
Power
Management
Unit
Memory
Baseband
Processor
Transceiver
LTE / 3G / 2G
Power Amplifiers
Figure 4: LENA-R8 series modules internal VCC supply routing simplified block diagram

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1.6.1.1 VCC supply requirements
Table 5 summarizes the requirements for the VCC module supply. See section 2.2.1 for all the
suggestions to properly design a VCC supply circuit compliant to the requirements listed in Table 5.
⚠VCC supply circuit affects the RF compliance of the device integrating LENA-R8 series modules
with applicable required certification schemes as well as antenna circuit design. RF performance
is optimized by fulfilling the requirements for the VCC supply summarized in Table 5.
Item
Requirement
Remark
VCC nominal voltage
Within VCC normal operating range:
3.4 V min. / 4.2 V max.
Operating within 3GPP / ETSI specifications: RF
performance is optimized when VCC PA voltage is inside
the normal operating range limits.
VCC voltage during
normal operation
Within VCC extended operating range:
3.2 V min. / 4.5 V max.
Operating with possible slight deviation in RF
performance outside normal operating range.
VCC voltage must be above the extended operating range
minimum limit to switch-on the module and to avoid
possible switch-off of the module.
Operation above VCC extended operating range is not
recommended and may affect device reliability.
VCC average current
Support with adequate margin the highest
averaged VCC current consumption value
in connected mode conditions specified in
the LENA-R8 series data sheet [1]
The highest averaged VCC current consumption can be
greater than the specified value according to the actual
antenna mismatching, temperature and VCC voltage.
For a safe design margin, use a VCC supply source that
can deliver double the typical average VCC current
consumption at maximum Tx power, normal ambient
temperature and normal voltage condition shown in the
LENA-R8 series data sheet [1].
See 1.6.1.3 / 1.6.1.2 for connected mode current profiles.
VCC peak current
Support with margin the highest peak VCC
current consumption value in connected
mode conditions specified in the LENA-R8
series data sheet [1]
The specified highest peak of VCC current consumption
occurs during GSM single transmit slot in 850/900 MHz
connected mode, in case of a mismatched antenna.
See 1.6.1.3 for 2G connected mode current profiles.
VCC voltage drop
during 2G Tx slots
Lower than 400 mV
VCC voltage drop directly affects the RF compliance with
applicable certification schemes.
Figure 7 describes VCC voltage drop during Tx slots.
VCC voltage ripple
during 2G/LTE Tx
Noise in the supply must be minimized
VCC voltage ripple directly affects the RF compliance
with applicable certification schemes.
Figure 7 describes VCC voltage ripple during Tx slots.
VCC under/over-shoot
at start/end of Tx
slots
Absent or at least minimized
VCC under/over-shoot directly affects the RF compliance
with applicable certification schemes.
Figure 7 describes VCC voltage under/over-shoot.
Table 5: Summary of VCC supply requirements
1.6.1.2 VCC consumption in LTE connected mode
During an LTE connection, the module may transmit and receive continuously due to the frequency
division duplex (FDD) mode of operation or it may transmit and receive alternatively due to the time
division duplex (TDD) mode of operation available with LTE radio access technology.
The current consumption depends on output RF power, which is always regulated by the network (the
current base station), sending power control commands to the module, indicating a maximum output
RF power of approximately 0.25 W down to a minimum output RF power of approximately 0.1 µW, so
that the current consumption may vary a lot as illustrated in Figure 5, showing an example of current
consumption profile versus time in the LTE FDD connected mode. Detailed current consumption
values can be found in LENA-R8 series data sheet [1].

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Time
[ms]
Current [mA]
Current consumpti on val ue
depends on TX power and
actual antennaload
1 slot
1 resource block
(0.5 ms) 1 LTE ra dioframe
(10 ms)
0
300
200
100
500
400
600
700
Figure 5: VCC current consumption profile versus time during LTE connection (TX and RX continuously enabled)
1.6.1.3 VCC consumption in 2G connected mode
When a GSM call is established, the VCC consumption is determined by the current consumption
profile typical of the GSM transmitting and receiving bursts.
The current consumption peak during a transmission slot is strictly dependent on the transmitted
power, which is regulated by the network. The transmitted power in the transmit slot is also the more
relevant factor for determining the average current consumption.
If the module is transmitting in 2G single-slot mode (as in GSM talk mode) in the 850 or 900 MHz
bands, at the maximum RF power control level (approximately 2 W or 33 dBm in the Tx slot/burst), the
current consumption can reach an high peak / pulse (see LENA-R8 series data sheet [1]) for 576.9 µs
(width of the transmit slot/burst) with a periodicity of 4.615 ms (width of 1 frame = 8 slots/burst), so
with a 1/8 duty cycle according to GSM TDMA (Time Division Multiple Access).
If the module is transmitting in 2G single-slot mode in the 1800 or 1900 MHz bands, the current
consumption figures are quite lower than the one in the low bands, due to the 3GPP specifications.
Figure 6 shows an example of the module current consumption profile versus time in GSM talk mode.
Time [ms]
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
GSM frame
4.615 ms
(1 frame = 8 slots)
Current [A]
200 mA
60-120 mA
1900 mA
Peak current depends
on TX power and actual
antenna load
GSM frame
4.615 ms
(1 frame = 8 slots)
60-120 mA 10-40 mA
0.0
1.5
1.0
0.5
2.0
Figure 6: VCC current consumption profile versus time during a GSM call (1 TX slot, 1 RX slot)
Figure 7 illustrates VCC voltage profile versus time during a GSM call, according to the related VCC
current consumption profile described in Figure 6.
Time
undershoot
overshoot
ripple
drop
Voltage
3.8 V
(typ)
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
GSM frame
4.615 ms
(1frame = 8 slots)
GSM frame
4.615 ms
(1frame = 8 slots)
Figure 7: Description of the VCC voltage profile versus time during a GSM call (1 TX slot, 1 RX slot)

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1.6.1.4 VCC consumption in low power idle mode
The power saving configuration is disabled by default, but it can be enabled using the appropriate AT
command (see the AT commands manual [2], +UPSV AT command). When power saving is enabled,
the module automatically enters low power idle mode whenever possible, reducing consumption.
When the power saving configuration is enabled and the module is registered or attached to a
network, the module automatically enters the low power idle mode whenever possible, but it must
periodically monitor the paging channel of the current base station (paging block reception), in
accordance to 2G / LTE requirements, waking up periodically to receive the paging block. In between,
the module enters low power idle mode whenever possible. This is known as discontinuous reception
(DRX). Figure 8 illustrates a typical example of the current consumption profile in this condition.
Detailed consumption values can be found in LENA-R8 series data sheet [1].
IDLE MODE ACTIVE MODE IDLE MODE
Active mode
enabled
Idle mode
enabled
Time [s]
Current [mA]
Time [ms]
Current [mA]
RX
enabled
0
100
0
100
Paging period
floor current
Figure 8: VCC current consumption profile with power saving enabled and module registered with the network: the module
is in low-power idle mode and periodically wakes up to active mode to monitor the paging channel for paging block reception
1.6.1.5 VCC consumption in active mode (low power idle mode disabled)
The active mode is the state where the module is switched on and ready to communicate with an
external device by the application interfaces (as the USB or the UART serial interface). The module
processor core is active, and the 26 MHz reference clock frequency is used.
If the low power idle mode configuration is disabled, as it is by default (see AT commands manual [2],
+UPSV AT commands for details), the module remains in active mode. Figure 9 illustrates a typical
example of the module current consumption profile in this condition. In such case, the module is
registered with the network and while active mode is maintained, the receiver is periodically activated
to monitor the paging channel for paging block reception. Detailed current consumption values can
be found in the LENA-R8 series data sheet [1].
ACTIVE MODE
Paging period
Time [s]
Current [mA]
Time [ms]
Current [mA]
RX
Enabled
0
100
0
100
Figure 9: VCC current consumption profile with power saving disabled and module registered with the network: active mode
is always held and the receiver is periodically activated to monitor the paging channel for paging block reception

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1.6.2 Cellular RTC supply input / output (V_BCKP)
When VCC voltage is within the valid operating range, the internal Power Management Unit (PMU)
supplies the Real Time Clock (RTC) of the LENA-R8 series modules’ cellular subsystem, and the same
supply voltage is available on the V_BCKP pin. If the VCC voltage is under the minimum operating limit
(e.g. during not powered mode), the V_BCKP pin can externally supply the RTC of the LENA-R8 series
modules’ cellular subsystem.
1.6.3 Cellular generic digital interfaces supply output (V_INT)
The V_INT output pin of the LENA-R8 series modules cellular system is connected to an internal 1.8 V
supply with a current capability specified in the LENA-R8 series data sheet [1]. This supply is
internally generated by a linear LDO regulator integrated in the Power Management Unit and it is
internally used to source the generic digital interfaces of the cellular module (as the UARTs, I2C, I2S,
GPIOs), as described in Figure 10. The output of this regulator is enabled when the cellular system is
switched on, and disabled when the cellular system is switched off.
BB processor
51
VCC
4V_INT
LDO
regulator
Digital I/O
Interfaces
Power
Management
Unit
LENA-R8 series
Memory
Figure 10: LENA-R8 series interfaces supply output (V_INT) simplified block diagram
1.7 Cellular system function interfaces
1.7.1 Cellular system power-on
When LENA-R8 series modules cellular system is not powered, it can be switched on as follows:
•Apply a voltage at the VCC module supply input within the operating range (see LENA-R8 series
data sheet [1], cellular system VCC operating input voltage), and then force a low level at the
PWR_ON input pin, which is normally set high by an internal pull-up, for a valid time period (see
LENA-R8 series data sheet [1], PWR_ON input line low time to trigger cellular system switch on).
When LENA-R8 series modules cellular system is in power-off mode (switched off, with a voltage at
the VCC supply input within the normal operating range reported in LENA-R8 series data sheet [1]),
it can be switched on by:
•Forcing a low level at the PWR_ON input pin, which is normally set high by an internal pull-up, for
a valid time period (see the LENA-R8 series data sheet [1], PWR_ON low time for switch on).
•RTC alarm, i.e. pre-programmed scheduled time by +CALA AT command.
The PWR_ON input line is intended to be driven by open drain, open collector, or contact switch.
As described in Figure 11, the PWR_ON input line is internally pulled up. The input voltage thresholds
are different from the other generic digital interfaces as indicated in LENA-R8 series data sheet [1].
Baseband
processor
15
PWR_ON
LENA-R8 series
Power-on/off
Power
management
Power-on/off
Figure 11: LENA-R8 series PWR_ON input description