Telit Wireless Solutions UE866-N3G Installation manual

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 1 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
UE866 HARDWARE USER
GUIDE

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 2 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
APPLICABILITY TABLE
PRODUCTS
UE866-N3G
UE866-EU

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 3 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
DISCLAIMER
LEGAL NOTICE
These Specifications are general guidelines pertaining to product selection and application and may
not be appropriate for your particular project. Telit (which hereinafter shall include, its agents, licensors
and affiliated companies) makes no representation as to the particular products identified in this
document and makes no endorsement of any product. Telit disclaims any warranties, expressed or
implied, relating to these specifications, including without limitation, warranties or merchantability,
fitness for a particular purpose or satisfactory quality. Without limitation, Telit reserves the right to
make changes to any products described herein and to remove any product, without notice.
It is possible that this document may contain references to, or information about Telit products,
services and programs, that are not available in your region. Such references or information must not
be construed to mean that Telit intends to make available such products, services and programs in
your area.
USE AND INTELLECTUAL PROPERTY RIGHTS
These Specifications (and the products and services contained herein) are proprietary to Telit and its
licensors and constitute the intellectual property of Telit (and its licensors). All title and intellectual
property rights in and to the Specifications (and the products and services contained herein) is owned
exclusively by Telit and its licensors. Other than as expressly set forth herein, no license or other
rights in or to the Specifications and intellectual property rights related thereto are granted to you.
Nothing in these Specifications shall, or shall be deemed to, convey license or any other right under
Telit’s patents, copyright, mask work or other intellectual property rights or the rights of others.
You may not, without the express written permission of Telit: (i) copy, reproduce, create derivative
works of, reverse engineer, disassemble, decompile, distribute, merge or modify in any manner these
Specifications or the products and components described herein; (ii) separate any component part of
the products described herein, or separately use any component part thereof on any equipment,
machinery, hardware or system; (iii) remove or destroy any proprietary marking or legends placed
upon or contained within the products or their components or these Specifications; (iv) develop
methods to enable unauthorized parties to use the products or their components; and (v) attempt to
reconstruct or discover any source code, underlying ideas, algorithms, file formats or programming or
interoperability interfaces of the products or their components by any means whatsoever. No part of
these Specifications or any products or components described herein may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any language or computer language, in any
form or by any means, without the prior express written permission of Telit.

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 4 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
HIGH RISK MATERIALS
Components, units, or third-party products contained or used with the products described herein
are NOT fault-tolerant and are NOT designed, manufactured, or intended for use as on-line control
equipment in the following hazardous environments requiring fail-safe controls: the operation of
Nuclear Facilities, Aircraft Navigation or Aircraft Communication Systems, Air Traffic Control, Life
Support, or Weapons Systems (“High Risk Activities"). Telit, its licensors and its supplier(s) specifically
disclaim any expressed or implied warranty of fitness for such High Risk Activities.
TRADEMARKS
You may not and may not allow others to use Telit or its third party licensors’ trademarks. To the
extent that any portion of the products, components and any accompanying documents contain
proprietary and confidential notices or legends, you will not remove such notices or legends.
THIRD PARTY RIGHTS
The software may include Third Party Right software. In this case you agree to comply with all terms
and conditions imposed on you in respect of such separate software. In addition to Third Party Terms,
the disclaimer of warranty and limitation of liability provisions in this License shall apply to the Third
Party Right software.
TELIT HEREBY DISCLAIMS ANY AND ALL WARRANTIES EXPRESS OR IMPLIED FROM ANY
THIRD PARTIES REGARDING ANY SEPARATE FILES, ANY THIRD PARTY MATERIALS
INCLUDED IN THE SOFTWARE, ANY THIRD PARTY MATERIALS FROM WHICH THE SOFTWARE
IS DERIVED (COLLECTIVELY “OTHER CODE”), AND THE USE OF ANY OR ALL THE OTHER
CODE IN CONNECTION WITH THE SOFTWARE, INCLUDING (WITHOUT LIMITATION) ANY
WARRANTIES OF SATISFACTORY QUALITY OR FITNESS FOR A PARTICULAR PURPOSE.
NO THIRD PARTY LICENSORS OF OTHER CODE SHALL HAVE ANY LIABILITY FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND WHETHER
MADE UNDER CONTRACT, TORT OR OTHER LEGAL THEORY, ARISING IN ANY WAY OUT OF
THE USE OR DISTRIBUTION OF THE OTHER CODE OR THE EXERCISE OF ANY RIGHTS
GRANTED UNDER EITHER OR BOTH THIS LICENSE AND THE LEGAL TERMS APPLICABLE TO
ANY SEPARATE FILES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Copyright © Telit Communications PLC.

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 5 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
CONTENTS
1Introduction 8
1.1 Scope 8
1.2 Audience 8
1.3 Contact Information, Support 8
1.4 List of acronyms 9
1.5 Text Conventions 10
1.6. Related Documents 10
2Overview 11
3Pins Allocation 12
3.1 Pin-out 12
LGA Pads Layout 16
4Power Supply 17
4.1 Power Supply Requirements 17
4.2 Power Consumption 18
4.3 General Design Rules 19
Electrical Design Guidelines 19
+5V Source Power Supply Design Guidelines 19
+ 12V input Source Power Supply Design Guidelines 20
Battery Source Power Supply Design Guidelines 21
Thermal Design Guidelines 22
Power Supply PCB layout Guidelines 23
4.4 RTC Bypass out 24
4.5 VAUX Power Output 24
5Digital Section 25
5.1 Logic Levels Specification 25
5.2 Power on 26
5.3 Power off 29
5.4 Reset 30
5.5 Communication ports 33
USB 2.0 HS 33
SPI 34
SPI Connections 34
Serial Ports 35
MODEM SERIAL PORT 1 (USIF0) 35

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 6 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
MODEM SERIAL PORT 2 (USIF1) 37
RS232 LEVEL TRANSLATION 38
5.6 General Purpose I/O 39
Using a GPIO as INPUT 40
Using a GPIO as OUTPUT 40
Indication of network service availability 41
SIMIN Detection 42
5.7 External SIM Holder 42
5.8 ADC Converter 43
5.9 DAC Converter 44
Enabling DAC 44
LOW Pass filter Example 45
6RF Section 46
6.1 Bands Variants 46
6.2 TX Output Power 46
6.3 RX Sensitivity 47
6.4 Antenna Requirements 48
PCB design guidelines 48
PCB Guidelines in case of FCC Certification 50
Transmission line design 50
Transmission Line Measurements 51
Antenna Installation Guidelines 54
7Audio Section 55
7.1 Overview 55
7.2 Digital Voice Interface 55
CODEC Examples 55
8Mechanical Design 56
8.1 Drawing 56
9Application Design 57
9.1 Footprint 57
9.2 PCB pad design 58
9.3 PCB pad dimensions 58
9.4 Stencil 60
9.5 Solder paste 60
9.6 Solder reflow 60
10 Packaging 62
10.1 Tray 62

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 7 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
10.2 Moisture sensitivity 64
11 SAFETY RECOMMANDATIONS 65
12 FCC/IC Regulatory notices 66
13 Document History 69
13.1 Revisions 69

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 8 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
1 INTRODUCTION
1.1 Scope
The aim of this document is the description of some hardware solutions useful for developing a product
with the Telit UE866 module.
1.2 Audience
This document is intended for Telit customers, who are integrators, about to implement their applications
using our UE866 modules.
1.3 Contact Information, Support
For general contact, technical support services, technical questions and report documentation errors
contact Telit Technical Support at:
TS-[email protected]
[e-mail]
[e-mail]
Alternatively, use:
http://www.telit.com/support
For detailed information about where you can buy the Telit modules or for recommendations on
accessories and components visit:
http://www.telit.com
Our aim is to make this guide as helpful as possible. Keep us informed of your comments and
suggestions for improvements.
Telit appreciates feedback from the users of our information.

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 9 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
1.4 List of acronyms
Acronym
Description
TTSC
Telit Technical Support Centre
USB
Universal Serial Bus
HS
High Speed
DTE
Data Terminal Equipment
UMTS
Universal Mobile Telecommunication System
WCDMA
Wideband Code Division Multiple Access
HSDPA
High Speed Downlink Packet Access
HSUPA
High Speed Uplink Packet Access
UART
Universal Asynchronous Receiver Transmitter
HSIC
High Speed Inter Chip
SIM
Subscriber Identification Module
SPI
Serial Peripheral Interface
ADC
Analog – Digital Converter
DAC
Digital – Analog Converter
I/O
Input Output
GPIO
General Purpose Input Output
CMOS
Complementary Metal – Oxide Semiconductor
MOSI
Master Output – Slave Input
MISO
Master Input – Slave Output
CLK
Clock
MRDY
Master Ready
SRDY
Slave Ready
CS
Chip Select
RTC
Real Time Clock
PCB
Printed Circuit Board
ESR
Equivalent Series Resistance
VSWR
Voltage Standing Wave Radio
VNA
Vector Network Analyzer

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 10 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
1.5 Text Conventions
Danger – This information MUST be followed or catastrophic equipment failure
or bodily injury may occur.
Caution or Warning – Alerts the user to important points about integrating the
module, if these points are not followed, the module and end user equipment
may fail or malfunction.
Tip or Information – Provides advice and suggestions that may be useful when
integrating the module.
All dates are in ISO 8601 format, i.e. YYYY-MM-DD.
1.6. Related Documents
•Digital Voice Interface Application Note 80000NT10050A
•SPI Port Application Note 80000NT10053A
•SIM Holder Design Guides 80000NT10001a
•AT Commands Reference Guide 80378ST10091A
•Telit EVK2 User Guide 1vv0300704

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 11 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
2 OVERVIEW
The aim of this document is the description of some hardware solutions useful for developing a product
with the Telit UE866 module.
In this document all the basic functions of a mobile phone will be taken into account; for each one of
them a proper hardware solution will be suggested and eventually the wrong solutions and common
errors to be avoided will be evidenced. Obviously this document cannot embrace the whole hardware
solutions and products that may be designed. The wrong solutions to be avoided shall be considered
as mandatory, while the suggested hardware configurations shall not be considered mandatory, instead
the information given shall be used as a guide and a starting point for properly developing your product
with the Telit UE866 module. For further hardware details that may not be explained in this document
refer to the Telit UE866 Product Description document where all the hardware information is reported.
NOTICE:
(EN) The integration of the WCDMA UE866 cellular module within user
application shall be done according to the design rules described in this
manual.
(IT) L’integrazione del modulo cellulare WCDMA UE866 all’interno
dell’applicazione dell’utente dovrà rispettare le indicazioni progettuali descritte
in questo manuale.
(DE) Die Integration des UE866 WCDMA Mobilfunk-Moduls in ein Gerät muß
gemäß der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen.
(SL) Integracija WCDMA UE866 modula v uporabniški aplikaciji bo morala
upoštevati projektna navodila, opisana v tem priročniku.
(SP) La utilización del modulo WCDMA UE866 debe ser conforme a los usos
para los cuales ha sido deseñado descritos en este manual del usuario.
(FR) L’intégration du module cellulaire WCDMA UE866 dans l’application de
l’utilisateur sera faite selon les règles de conception décrites dans ce manuel.
(HE)
The information presented in this document is believed to be accurate and reliable. However, no
responsibility is assumed by Telit Communications S.p.A. for its use, nor any infringement of patents or
other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent rights of Telit Communications S.p.A. other than for circuitry embodied in
Telit products. This document is subject to change without notice.
UE866

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 12 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
3 PINS ALLOCATION
3.1 Pin-out
Pin
Signal
I/O
Function
Type
Comment
USB HS 2.0 COMMUNICATION PORT
E5
USB_D+
I/O
USB differential Data (+)
-
E6
USB_D-
I/O
USB differential Data (-)
-
D4 USB_VBUS AI
Power sense for the internal
USB transceiver.
-
Asynchronous Serial Port (USIF0) - Prog. / Data + HW Flow Control
B2 C109/DCD O
Output for Data carrier detect
signal (DCD) to DTE
CMOS 1.8V
B3 C125/RING O
Output for Ring indicator
signal (RI) to DTE
CMOS 1.8V
A3 C107/DSR O
Output for Data set ready
signal (DSR) to DTE
CMOS 1.8V
A2 C108/DTR I
Input for Data terminal ready
signal (DTR) from DTE
CMOS 1.8V
A1 C105/RTS I
Input for Request to send
signal (RTS) from DTE
CMOS 1.8V
B1 C106/CTS O
Output for Clear to send signal
(CTS) to DTE
CMOS 1.8V
A4 C103/TXD I
Serial data input (TXD) from
DTE
CMOS 1.8V
A5
C104/RXD
O
Serial data output to DTE
CMOS 1.8V
Asynchronous Auxiliary Serial Port (USIF1)
C2 RXD_AUX /SPI_MISO
I
O
Auxiliary UART (RX Data)
SPI_MISO
CMOS 1.8V
C1 TXD_AUX / SPI_MOSI
O
I
Auxiliary UART (TX Data)
SPI_MOSI
CMOS 1.8V
SIM card interface
C7 SIMVCC -
External SIM signal – Power
supply for the SIM
1.8 / 3V
B7
SIMRST
O
External SIM signal – Reset
1.8 / 3V
A7
SIMCLK
O
External SIM signal – Clock
1.8 / 3V
A6
SIMIO
I/O
External SIM signal – Data I/O
CMOS 1.8
X
SIMIN
I
Presence SIM input
1.8 / 3V
All GPI0 can be used
DIGITAL IO
C5
GPIO_01 / DVI_WA0
I/O
GPIO01 Configurable GPIO
CMOS 1.8V

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 13 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
/ Digital Audio Interface (WA0)
C6 GPIO_02 / JDR / DVI_RX I/O
GPIO02 I/O pin
/ Jammer Detect Report
/ Digital Audio Interface (RX)
CMOS 1.8V
D6 GPIO_03 / DVI_TX I/O
GPIO03 GPIO I/O pin
/ Digital Audio Interface (TX)
CMOS 1.8V
D5 GPIO_04 / DVI_CLK I/O
GPIO04 Configurable GPIO
Digital Audio Interface (CLK)
CMOS 1.8V
B5
GPIO_05
I/O
GPIO05 Configurable GPIO
CMOS 1.8V
B4 GPIO_06 I/O
GPIO06 Configurable GPIO
/ ALARM
CMOS 1.8V
C4 GPIO_07 I/O
GPIO07 Configurable GPIO
/ STATLED
CMOS 1.8V
Alternate Function STAT
LED
F11
SPI_CLK
I/O
SPI_CLK
CMOS 1.8V
E11
SPI_SRDY
I/O
SPI_SRDY
CMOS 1.8V
D11
SPI_MRDY
I/O
SPI_MRDY
CMOS 1.8V
ADC and DAC
F4 ADC_IN1 AI Analog/Digital converter input A/D
Accepted values 0 to 1.2V
DC
E4 DAC_OUT AO
Digital/Analog converter
output
D/A
RF SECTION
G2
Antenna
I/O
Antenna pad – 50 Ω
RF
Miscellaneous Functions
F5 VRTC AO
backup for the embedded
RTC supply (1.8V)
-
G4
RESET*
I
Reset Input
CMOS 1.8V
G6 VAUX / PWRMON O
1.8V stabilized output
Imax=100mA
/ Power ON monitor
Power
Power Supply
E2 VBATT -
Main power supply
(Baseband)
Power
E1
VBATT_PA
-
Main power supply (Radio PA)
Power
D1
GND
-
Ground
Power
F1
GND
-
Ground
Power
G1
GND
-
Ground
Power
D2
GND
-
Ground
Power
F2
GND
-
Ground
Power
C3
GND
-
Ground
Power
E3
GND
-
Ground
Power
F3
GND
-
Ground
Power

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 14 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
G3
GND
-
Ground
Power
F6
GND
-
Ground
Power
A8
GND
-
Ground
Power
G8
GND
-
Ground
Power
A11
GND
-
Ground
Power
G11
GND
-
Ground
Power
RESERVED
D3
RESERVED
-
RESERVED
G5
RESERVED
-
RESERVED
B6
RESERVED
-
RESERVED
D7
RESERVED
-
RESERVED
E7
RESERVED
-
RESERVED
F7
RESERVED
-
RESERVED
G7
RESERVED
-
RESERVED
B8
RESERVED
-
RESERVED
C8
RESERVED
-
RESERVED
D8
RESERVED
-
RESERVED
E8
RESERVED
-
RESERVED
F8
RESERVED
-
RESERVED
A9
RESERVED
-
RESERVED
B9
RESERVED
-
RESERVED
C9
RESERVED
-
RESERVED
D9
RESERVED
-
RESERVED
E9
RESERVED
-
RESERVED
F9
RESERVED
-
RESERVED
G9
RESERVED
-
RESERVED
A10
RESERVED
-
RESERVED
B10
RESERVED
-
RESERVED
C10
RESERVED
-
RESERVED
D10
RESERVED
-
RESERVED
E10
RESERVED
-
RESERVED
F10
RESERVED
-
RESERVED
G10
RESERVED
-
RESERVED
B11
RESERVED
-
RESERVED
C11
RESERVED
-
RESERVED

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 15 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
WARNING:
Reserved pins must not be connected
If not used, almost all pins should be left disconnected. The only exceptions are the following pins:
PAD
Signal
Note
E2
VBATT
E1
VBATT_PA
D1, F1, G1, D2, F2, C3, E3,
F3, G3, F6, A8, G8, A11,
G11
GND
G2
Antenna
A4
C103/TXD
If not used should be connected to a Test Point
A5 C104/RXD If not used should be connected to a Test Point
A1
C105/RTS
If not used should be connected to a Test Point
B1
C106/CTS
If not used should be connected to a Test Point
G6
VAUX / PWRMON
G4
RESET*
C1
TXD_AUX
If not used should be connected to a Test Point
C2
RXD_AUX
If not used should be connected to a Test Point
E5 USB D+
If not used should be connected to a Test Point or an
USB connector
E6 USB D-
If not used should be connected to a Test Point or an
USB connector
D4 USB_VBUS
If not used should be connected to a Test Point or an
USB connector
C7
SIMVCC
B7
SIMRST
A7
SIMCLK
A6
SIMIO
RTS pin should be connected to the GND (on the module side) if flow control is not used.
The above pins are also necessary to debug the application when the module is assembled on it so
we recommend connecting them also to dedicated test point.

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 16 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
LGA Pads Layout
TOP VIEW
A B C D E F G
1 C105/RTS C106/CTS TX AUX GND VBATT_PA GND GND
2 C108/DTR C109/DCD RX AUX GND VBATT GND ANT
3 C107/DSR C125/RING GND RFU GND GND GND
4 C103/TXD GPIO_06 GPIO_07 USB_VBUS DAC_OUT ADC_IN1 RESET*
5 C104/RXD GPIO_05 GPIO_01 GPIO_04 USB_D+ VRTC RESERVED
6 SIMIO RESERVED GPIO_02 GPIO_03 USB_D- GND VAUX/PWR
MON
7 SIMCLK SIMRST SIMVCC RESERVED RESERVED RESERVED RESERVED
8 GND RESERVED RFU RFU RFU RFU GND
9 RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED
10 RESERVED RESERVED RESERVED RESERVED RFU RESERVED RESERVED
11 GND RESERVED RESERVED SPI_MRDY SPI_SRDY SPI_CLK GND

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 17 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
4 POWER SUPPLY
The power supply circuitry and board layout are a very important part in the full product design and
they strongly reflect on the product overall performances, hence read carefully the requirements and
the guidelines that will follow for a proper design.
4.1 Power Supply Requirements
The external power supply must be connected to VBATT & VBATT_PA signals and must fulfil the
following requirements:
Power Supply
Value
Nominal Supply Voltage
3.8V
Normal Operating Voltage Range
3.40 V÷ 4.20 V
Extended Operating Voltage Range
3.10 V÷ 4.50 V
NOTE:
The Operating Voltage Range MUST never be exceeded; care must be taken
when designing the application’s power supply section to avoid having an
excessive voltage drop.
If the voltage drop is exceeding the limits it could cause a Power Off of the
module.
The Power supply must be higher than 3.22 V to power on the module
Overshoot voltage (regarding MAX Extended Operating Voltage) and drop in
voltage (regarding MIN Extended Operating Voltage) MUST never be
exceeded;
The “Extended Operating Voltage Range” can be used only with completely
assumption and application of the HW User guide suggestions.

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 18 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
4.2 Power Consumption
Mode
Average (mA)
Mode Description
Switched OFF
180uA
Module supplied but Switched Off
Idle mode (GSM/EDGE)
AT+CFUN=1
19
Normal mode: full functionality of the
module
AT+CFUN=4
16.5
Module is not registered on the network
AT+CFUN=5
1.2
Full functionality with power saving;
DRX9 (1.3mA in case of DRX5).
Operative mode (GSM)
CSD TX and RX Mode
GSM Voice Call
GSM 850/900 CSD PL5
220
DCS1800/ PCS1900 CSD PL0
167
GPRS 4TX+ 1RX
GPRS Sending Data Mode
GSM 850/900 PL5
580
DCS1800/ PCS1900 PL0
438
Idle mode (WCDMA)
AT+CFUN=1
19
Normal mode: full functionality of the
module
AT+CFUN=5
1.6 mA
Disabled TX and RX; DRX7
Operative mode (WCDMA)
WCDMA Voice
175
WCDMA voice call (TX = 10dBm)
WCDMA HSDPA (22dBm)
490
WCDMA data call (Cat 8, TX = 22dBm)
NOTE:
The electrical design for the Power supply should be made ensuring it will be
capable of a peak current output of at least 1 A.

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 19 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
4.3 General Design Rules
The principal guidelines for the Power Supply Design embrace three different design steps:
•the electrical design
•the thermal design
•the PCB layout.
Electrical Design Guidelines
The electrical design of the power supply depends strongly from the power source where this power is
drained. We will distinguish them into three categories:
•+5V input (typically PC internal regulator output)
•+12V input (typically automotive)
•Battery
+5V Source Power Supply Design Guidelines
•The desired output for the power supply is 3.8V, hence there's not a big difference between the
input source and the desired output and a linear regulator can be used. A switching power
supply will not be suited because of the low drop out requirements.
•When using a linear regulator, a proper heat sink shall be provided in order to dissipate the
power generated.
•A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks close to the Module, a 100μF capacitor is usually suited.
•Make sure the low ESR capacitor on the power supply output rated at least 10V.
•A protection diode should be inserted close to the power input, in order to save the UE866
from power polarity inversion. This can be the same diode as for spike protection.
An example of linear regulator with 5V input is:

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.12 •2017-02-10 20 of 70
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
+ 12V input Source Power Supply Design
Guidelines
•The desired output for the power supply is 3.8V, hence due to the big difference between the
input source and the desired output, a linear regulator is not suited and shall not be used. A
switching power supply will be preferable because of its better efficiency.
•When using a switching regulator, a 500kHz or more switching frequency regulator is preferable
because of its smaller inductor size and its faster transient response. This allows the regulator
to respond quickly to the current peaks absorption.
•In any case the frequency and Switching design selection is related to the application to be
developed due to the fact the switching frequency could also generate EMC interferences.
•For car PB battery the input voltage can rise up to 15,8V and this should be kept in mind when
choosing components: all components in the power supply must withstand this voltage.
•A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks, a 100μF capacitor is usually suited.
•Make sure the low ESR capacitor on the power supply output is rated at least 10V.
•For Car applications a spike protection diode should be inserted close to the power input, in
order to clean the supply from spikes.
•A protection diode should be inserted close to the power input, in order to save the UE866
from power polarity inversion. This can be the same diode as for spike protection.
An example of switching regulator with 12V input is in the below schematic: