Telit Communications S p A UE910N3 User Manual

UE910 3G HARDWARE USER GUIDE

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 1 of 78

UE910-N3G

APPLICABILITY TABLE

PRODUCTS

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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.

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 3 of 78

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.

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CONTENTS

1 Introduction 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

2 Overview 11 3 Pins Allocation 12

3.1 Pin-out 12

LGA Pads Layout 19

4 Power Supply 20

4.1 Power Supply Requirements 20

4.2 Power Consumption 21

4.3 General Design Rules 22

Electrical Design Guidelines 22

+5V Source Power Supply Design Guidelines 22 + 12V input Source Power Supply Design Guidelines 23 Battery Source Power Supply Design Guidelines 24 Thermal Design Guidelines 25 Power Supply PCB layout Guidelines 26

4.4 RTC Bypass out 27

4.5 VAUX Power Output 27

5 Digital Section 28

5.1 Logic Levels Specification 28

5.2 Power on 29

5.3 Power off 34

5.4 Unconditional Shutdown 36

5.5 Communication ports 39

USB 2.0 HS 39 USB HSIC 40 SPI 41

SPI Connections 41

Serial Ports 42

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MODEM SERIAL PORT 1 (USIF0) 42 MODEM SERIAL PORT 2 (USIF1) 44 RS232 LEVEL TRANSLATION 45

5.6 General Purpose I/O 46

Using a GPIO as INPUT 47 Using a GPIO as OUTPUT 47 Indication of network service availability 48

5.7 External SIM Holder 49

5.8 ADC Converter 49

6 RF Section 50

6.1 Bands Variants 50

6.2 TX Output Power 50

6.3 RX Sensitivity 50

6.4 Antenna Requirements 51

PCB design guidelines 51 PCB Guidelines in case of FCC Certification 53

Transmission line design 53 Transmission Line Measurements 54 Antenna Installation Guidelines 56

7 Audio Section 57

7.1 Overview 57

7.2 Analog Voice Interface 57

MIC connection 58 LINE IN Connection 60 EAR Connection 61

7.3 Digital Voice Interface 62

CODEC Examples 62

8 Mechanical Design 63

8.1 Drawing 63

9 Application Design 64

9.1 Footprint 64

9.2 PCB pad design 65

9.3 PCB pad dimensions 65

9.4 Stencil 67

9.5 Solder paste 67

9.6 Solder reflow 67

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10 Packaging 69

10.1 Tray 69

10.2 Reel 70

Carrier Tape Detail 70 Reel Detail 71 Reel Box Detail 72

10.3 Moisture sensitivity 72

11 SAFETY RECOMMANDATIONS 73 12 FCC/IC Regulatory notices 74 13 Document History 77

13.1 Revisions 77

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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 UE910 module.

1.2 Audience

This document is intended for Telit customers, who are integrators, about to implement their applications using our UE910 modules.

1.3 Contact Information, Support

For general contact, technical support services, technical questions and report documentation errors contact Telit Technical Support at:

TS-EMEA@telit.com TS-AMERICAS@telit.com TS-APAC@telit.com

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.

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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

1.4 List of acronyms

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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.

1.5 Text Conventions

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  USB HSIC Port Application Note 80000NT10071A  AT Commands Reference Guide 80378ST10091A  Telit EVK2 User Guide 1vv0300704

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NOTICE:

(EN) The integration of the WCDMA UE910 cellular module within user application shall be done according to the design rules described in this manual.

(IT) L’integrazione del modulo cellulare WCDMA UE910 all’interno

dell’applicazione dell’utente dovrà rispettare le indicazioni progettuali descritte

in questo manuale. (DE) Die Integration des UE910 WCDMA Mobilfunk-Moduls in ein Gerät muß

gemäß der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen. (SL) Integracija WCDMA UE910 modula v uporabniški aplikaciji bo morala

upoštevati projektna navodila, opisana v tem priročniku. (SP) La utilización del modulo WCDMA UE910 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 UE910 dans l’application de l’utilisateur sera faite selon les règles de conception décrites dans ce manuel.

(HE)

UE910

2 OVERVIEW

The aim of this document is the description of some hardware solutions useful for developing a product with the Telit UE910 3G 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 UE910 module. For further hardware details that may not be explained in this document refer to the Telit UE910 Product Description document where all the hardware information is reported.

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.

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Signal

I/O

Function

Type

Comment

USB HS 2.0 COMMUNICATION PORT

B15

USB_D+

I/O

USB differential Data (+)

-

C15

USB_D-

I/O

USB differential Data (-)

-

A13

VUSB

I

Power sense for the internal USB transceiver.

-

Asynchronous Serial Port (USIF0) - Prog. / Data + HW Flow Control

N15

C103/TXD

I

Serial data input from DTE

CMOS 1.8V

M15

C104/RXD

O

Serial data output to DTE

CMOS 1.8V

M14

C108/DTR

I

Input for (DTR) from DTE

CMOS 1.8V

L14

C105/RTS

I

Input for Request to send signal (RTS) from DTE

CMOS 1.8V

P15

C106/CTS

O

Output for Clear to Send signal (CTS) to DTE

CMOS 1.8V

N14

C109/DCD

O

Output for (DCD) to DTE

CMOS 1.8V

P14

C107/DSR

O

Output for (DSR) to DTE

CMOS 1.8V

R14

C125/RING

O

Output for Ring (RI) to DTE

CMOS 1.8V

Asynchronous Auxiliary Serial Port (USIF1)

D15

TX_AUX

O

Auxiliary UART (TX Data to DTE)

CMOS 1.8V

E15

RX_AUX

I

Auxiliary UART (RX Data from DTE)

CMOS 1.8V

USB HSIC

A12

HSIC_USB_DATA

I/O

USB HSIC data signal

CMOS 1.2V

A11

HSIC_USB_STRB

I/O

USB HSIC strobe signal

CMOS 1.2V

H15

HSIC_SLAVE_WAKEUP

I

Slave Wake Up

CMOS 1.8V

Shared with SPI_MRDY

F15

HSIC_HOST_WAKEUP

O

Host Wake Up

CMOS 1.8V

Shared with SPI CLK

K15

HSIC_SUSPEND_REQUEST

O

Slave Suspend Request

CMOS 1.8V

Shared with GPIO08

J15

HSIC_HOST_ACTIVE

I

Active Host Indication

CMOS 1.8V

Shared with SPI_SRDY

SIM card interface

3 PINS ALLOCATION

3.1 Pin-out

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A6

SIMCLK

O

External SIM signal – Clock

1.8 / 3V

A7

SIMRST

O

External SIM signal – Reset

1.8 / 3V

A5

SIMIO

I/O

External SIM signal – Data I/O

1.8 / 3V

A4

SIMIN

I

External SIM signal – Presence (active low)

CMOS 1.8

A3

SIMVCC

-

External SIM signal – Power supply for the SIM

1.8 / 3V

Analog Audio

B2

EAR+

O

Analog Audio Interface (EAR+)

B3

EAR-

O

Analog Audio Interface (EAR-)

B4

MIC+

I

Analog Audio Interface (MIC+)

B5

MIC-

I

Analog Audio Interface (MIC-)

Digital Voice Interface (DVI)

B9

DVI_WA0

I/O

Digital Audio Interface (WA0)

CMOS 1.8V

B6

DVI_RX

I/O

Digital Audio Interface (RX)

CMOS 1.8V

B7

DVI_TX

I/O

Digital Audio Interface (TX)

CMOS 1.8V

B8

DVI_CLK

I/O

Digital Audio Interface (CLK)

CMOS 1.8V

SPI

D15

SPI_MOSI

I

SPI MOSI

CMOS 1.8V

Shared with TX_AUX

E15

SPI_MISO

O

SPI_MISO

CMOS 1.8V

Shared with RX_AUX

F15

SPI_CLK

I

SPI Clock

CMOS 1.8V

H15

SPI_MRDY

I

SPI_MRDY

CMOS 1.8V

J15

SPI_SRDY

O

SPI_SRDY

CMOS 1.8V

DIGITAL IO

C8

GPIO_01

I/O

GPIO_01 /STAT LED

CMOS 1.8V

Alternate Function STAT LED

C9

GPIO_02

I/O

GPIO_02

CMOS 1.8V

C10

GPIO_03

I/O

GPIO_03

CMOS 1.8V

C11

GPIO_04

I/O

GPIO_04

CMOS 1.8V

B14

GPIO_05

I/O

GPIO_05

CMOS 1.8V

C12

GPIO_06

I/O

GPIO_06

CMOS 1.8V

C13

GPIO_07

I/O

GPIO_07

CMOS 1.8V

K15

GPIO_08

I/O

GPIO_08

CMOS 1.8V

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L15

GPIO_09

I/O

GPIO_09

CMOS 1.8V

G15

GPIO_10

I/O

GPIO_10

CMOS 1.8V

ADC

B1

ADC_IN1

AI

Analog / Digital converter input

A/D

Accepted values 0 to 1.2V DC

RF SECTION

K1

ANTENNA

I/O

WCDMA Antenna (50 ohm)

RF

Miscellaneous Functions

R13

HW_SHUTDOWN*

I

HW Unconditional Shutdown

CMOS 1.8V

Active low

R12

ON_OFF*

I

Input command for power ON

CMOS 1.8V

Active low

C14

VRTC

I

VRTC Backup capacitor

Power

backup for the embedded RTC supply

R11

VAUX/PWRMON

O

Supply Output for external accessories / Power ON Monitor

1.8V

Power Supply

M1

VBATT

-

Main power supply (Baseband)

Power

M2

VBATT

-

Main power supply (Baseband)

Power

N1

VBATT_PA

-

Main power supply (Radio PA)

Power

N2

VBATT_PA

-

Main power supply (Radio PA)

Power

P1

VBATT_PA

-

Main power supply (Radio PA)

Power

P2

VBATT_PA

-

Main power supply (Radio PA)

Power

E1

GND

-

Ground

Power

G1

GND

-

Ground

Power

H1

GND

-

Ground

Power

J1

GND

-

Ground

Power

L1

GND

-

Ground

Power

A2

GND

-

Ground

Power

E2

GND

-

Ground

Power

F2

GND

-

Ground

Power

G2

GND

-

Ground

Power

H2

GND

-

Ground

Power

J2

GND

-

Ground

Power

K2

GND

-

Ground

Power

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L2

GND

-

Ground

Power

R2

GND

-

Ground

Power

M3

GND

-

Ground

Power

N3

GND

-

Ground

Power

P3

GND

-

Ground

Power

R3

GND

-

Ground

Power

D4

GND

-

Ground

Power

M4

GND

-

Ground

Power

N4

GND

-

Ground

Power

P4

GND

-

Ground

Power

R4

GND

-

Ground

Power

N5

GND

-

Ground

Power

P5

GND

-

Ground

Power

R5

GND

-

Ground

Power

N6

GND

-

Ground

Power

P6

GND

-

Ground

Power

R6

GND

-

Ground

Power

P8

GND

-

Ground

Power

R8

GND

-

Ground

Power

P9

GND

-

Ground

Power

P10

GND

-

Ground

Power

R10

GND

-

Ground

Power

M12

GND

-

Ground

Power

B13

GND

-

Ground

Power

P13

GND

-

Ground

Power

E14

GND

-

Ground

Power

RESERVED

C1

RESERVED

-

RESERVED

D1

RESERVED

-

RESERVED

B2

RESERVED

-

RESERVED

C2

RESERVED

-

RESERVED

D2

RESERVED

-

RESERVED

B3

RESERVED

-

RESERVED

C3

RESERVED

-

RESERVED

D3

RESERVED

-

RESERVED

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E3

RESERVED

-

RESERVED

F3

RESERVED

-

RESERVED

G3

RESERVED

-

RESERVED

H3

RESERVED

-

RESERVED

J3

RESERVED

-

RESERVED

K3

RESERVED

-

RESERVED

L3

RESERVED

-

RESERVED

B4

RESERVED

-

RESERVED

C4

RESERVED

-

RESERVED

B5

RESERVED

-

RESERVED

C5

RESERVED

-

RESERVED

C6

RESERVED

-

RESERVED

C7

RESERVED

-

RESERVED

N7

RESERVED

-

RESERVED

P7

RESERVED

-

RESERVED

N8

RESERVED

-

RESERVED

N9

RESERVED

-

RESERVED

A10

RESERVED

-

RESERVED

N10

RESERVED

-

RESERVED

N11

RESERVED

-

RESERVED

B12

RESERVED

-

RESERVED

D12

RESERVED

-

RESERVED

N12

RESERVED

-

RESERVED

P12

RESERVED

-

RESERVED

F14

RESERVED

-

RESERVED

G14

RESERVED

-

RESERVED

H14

RESERVED

-

RESERVED

J14

RESERVED

-

RESERVED

K14

RESERVED

-

RESERVED

N13

RESERVED

-

RESERVED

L13

RESERVED

-

RESERVED

J13

RESERVED

-

RESERVED

M13

RESERVED

-

RESERVED

K13

RESERVED

-

RESERVED

H13

RESERVED

-

RESERVED

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WARNING: Reserved pins must not be connected

G13

RESERVED

-

RESERVED

F13

RESERVED

-

RESERVED

B1

RESERVED

-

RESERVED

B11

RESERVED

-

RESERVED

B10

RESERVED

-

RESERVED

A9

RESERVED

-

RESERVED

A8

RESERVED

-

RESERVED

D14

RESERVED

-

RESERVED

A14

RESERVED

-

RESERVED

D13

RESERVED

-

RESERVED

E13

RESERVED

-

RESERVED

F1

RESERVED

-

RESERVED

R9

RESERVED

-

RESERVED

R7

RESERVED

-

RESERVED

P11

RESERVED

-

RESERVED

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PAD

Signal

Note

M1,M2,N1,N2,P1,P2

VBATT & VBATT_PA

E1, G1, H1, J1, L1, A2, E2, F2, G2, H2

J2,K2,L2,R2,M3,N3,P3,R3,D4,M4, N4,P4,R4,N5,P5,R5,N6,P6,R6,P8,

R8,P9,P10,R10,M12,B13,P13,E14

GND

R12

ON/OFF*

R13

HW_SHUTDOWN*

B15

USB_D+

If not used should be connected to a

Test Point or an USB connector

C15

USB_D-

If not used should be connected to a

Test Point or an USB connector

A13

VUSB

If not used should be connected to a

Test Point or an USB connector

N15

C103/TXD

If not used should be connected to a

Test Point

M15

C104/RXD

If not used should be connected to a

Test Point

L14

C105/RTS

If the flow control is not used it should

be connected to GND

P15

C106/CTS

If not used should be connected to a

Test Point

D15

TXD_AUX

If not used should be connected to a

Test Point

E15

RXD_AUX

If not used should be connected to a

Test Point

K1

MAIN ANTENNA

A6

SIMCLK

A7

SIMRST

A5

SIMIO A4

SIMIN

If not used, almost all pins should be left disconnected. The only exceptions are the following pins:

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.

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A B C D E F

G H J K L M N P R

1

RES

GND

RES

GND

ANT

GND

VBATT

_PA

VBATT

_PA

2

GND

SPK+

RES

GND

VBATT

_PA

VBATT

_PA

GND 3

SIMVC

C

SPK -

RES

GND

4

SIMIN

MIC+

RES

GND GND

GND

5

SIMIO

MIC -

RES

GND

6

SIMCL

K

DVI_RX

RES

GND

7

SIMRS

T

DVI_TX

RES

8

RES

DVI_CLK

GPIO_0

1

RES

GND

GND 9

RES

DVI_WA

0

GPIO_0

2

RES

GND

RES

10

RES

GPIO_0

3

RES

GND

11

HSIC_

USB_S

TRB

RES

GPIO_0

4

RES

VAUX/ PWRM

ON

12

HSIC_

USB_D

ATA

RES

GPIO_0

6

RES

GND

RES

ON_OF

F*

13

VUSB

GND

GPIO_0

7

RES

GND

HW_SH

UTDO

WN*

14

RES

GPIO_05

VRTC

RES

GND

RES

C105/R

TS

C108/D

TR

C109/D

CD

C107/D

SR

C125/R

ING

15 USB_D+

USB_D

-

TX AUX

RX

AUX

SPI_CL

K

GPIO_1

0

SPI_M

RDY

SPI_SR

DY

GPIO_0

8

GPIO_0

9

C104/R

XD

C103/T

XD

C106/C

TS

LGA Pads Layout

TOP VIEW

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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.

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:

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Mode

Average (mA)

Mode Description

Switched Off

180 uA

Module supplied but switched off

AT+CFUN=5

1.6

Disabled TX and RX; DRX7

WCDMA Voice

170

WCDMA voice call (TX = 10dBm)

WCDMA HSDPA (22dBm)

538

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.

4.2 Power Consumption

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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.

An example of linear regulator with 5V input is:

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+ 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.

An example of switching regulator with 12V input is in the below schematic:

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WARNING: The three cells Ni/Cd or Ni/MH 3,6 V Nom. battery types or 4V PB types MUST NOT BE USED DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the UE910 and damage it.

NOTE: DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with UE910. Their use can lead to overvoltage on the UE910 and damage it. USE ONLY Li-Ion battery types.

Battery Source Power Supply Design Guidelines

The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit UE910 module.

 A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current

absorption peaks, a 100μF tantalum capacitor is usually suited.

 Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.  A protection diode should be inserted close to the power input, in order to save the UE910 from

power polarity inversion. Otherwise the battery connector should be done in a way to avoid polarity inversions when connecting the battery.

 The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A;

the suggested capacity is from 500mAh to 1000mAh.

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Telit Communications S p A UE910N3 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual