Telit Communications S p A CE910B-DUAL CDMA Module User Manual CE910 Family Hardware User Guide

Telit Communications S.p.A. CDMA Module CE910 Family Hardware User Guide

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CE910 Series Hardware User

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1vv0301010 Rev.11 – 2015-10-27

CE910 Family Hardware User Guide

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Page 2 of 75

APPLICABILITY TABLE

PRODUCT

CE910-DUAL

CE910-SC

CE910B-DUAL

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SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Notice

While reasonable efforts have been made to assure the accuracy of this document, Telit assumes no

liability resulting from any inaccuracies or omissions in this document, or from use of the information

obtained herein. The information in this document has been carefully checked and is believed to be

entirely reliable. However, no responsibility is assumed for inaccuracies or omissions. Telit reserves

the right to make changes to any products described herein and reserves the right to revise this

document and to make changes from time to time in content hereof with no obligation to notify any

person of revisions or changes. Telit does not assume any liability arising out of the application or use

of any product, software, or circuit described herein; neither does it convey license under its patent

rights or the rights of others.

It is possible that this publication may contain references to, or information about Telit products

(machines and programs), programming, or services that are not announced in your country. Such

references or information must not be construed to mean that Telit intends to announce such Telit

products, programming, or services in your country.

Copyrights

This instruction manual and the Telit products described in this instruction manual may be, include or

describe copyrighted Telit material, such as computer programs stored in semiconductor memories or

other media. Laws in the Italy and other countries preserve for Telit and its licensors certain exclusive

rights for copyrighted material, including the exclusive right to copy, reproduce in any form,

distribute and make derivative works of the copyrighted material. Accordingly, any copyrighted

material of Telit and its licensors contained herein or in the Telit products described in this instruction

manual may not be copied, reproduced, distributed, merged or modified in any manner without the

express written permission of Telit. Furthermore, the purchase of Telit products shall not be deemed

to grant either directly or by implication, estoppel, or otherwise, any license under the copyrights,

patents or patent applications of Telit, as arises by operation of law in the sale of a product.

Computer Software Copyrights

The Telit and 3rd Party supplied Software (SW) products described in this instruction manual may

include copyrighted Telit and other 3rd Party supplied computer programs stored in semiconductor

memories or other media. Laws in the Italy and other countries preserve for Telit and other 3rd Party

supplied SW certain exclusive rights for copyrighted computer programs, including the exclusive

right to copy or reproduce in any form the copyrighted computer program. Accordingly, any

copyrighted Telit or other 3rd Party supplied SW computer programs contained in the Telit products

described in this instruction manual may not be copied (reverse engineered) or reproduced in any

manner without the express written permission of Telit or the 3rd Party SW supplier. Furthermore, the

purchase of Telit products shall not be deemed to grant either directly or by implication, estoppel, or

otherwise, any license under the copyrights, patents or patent applications of Telit or other 3rd Party

supplied SW, except for the normal non-exclusive, royalty free license to use that arises by operation

of law in the sale of a product.

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Usage and Disclosure Restrictions

License Agreements

The software described in this document is the property of Telit and its licensors. It is furnished by

express license agreement only and may be used only in accordance with the terms of such an

agreement.

Copyrighted Materials

Software and documentation are copyrighted materials. Making unauthorized copies is prohibited by

law. No part of the software or documentation 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 prior written permission of Telit

High Risk Materials

Components, units, or third-party products used in the product 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 and its supplier(s) specifically disclaim any expressed

or implied warranty of fitness for such High Risk Activities.

Trademarks

TELIT and the Stylized T Logo are registered in Trademark Office. All other product or service

names are the property of their respective owners.

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Contents

1. Introduction ...................................................... 8

1.1. Scope .......................................................... 8

1.2. Audience ....................................................... 8

1.3. Contact Information, Support ................................... 8

1.4. Document Organization .......................................... 9

1.5. Text Conventions .............................................. 10

1.6. Related Documents ............................................. 10

2. General Product Description ...................................... 11

2.1. Overview ...................................................... 11

2.2. Product Specifications ........................................ 12

2.3. RoHS Compliance ............................................... 12

3. CE910 Module Connections ......................................... 13

3.1. Pin-Out ....................................................... 13

3.1.1. LGA Pads Layout(CE910-DUAL & CE910B-DUAL) ....................... 18

3.1.2. LGA Pads Layout(CE910-SC) ....................................... 19

4. Hardware Commands ................................................ 20

4.1. Turning on the CE910 module ................................... 20

4.1.1. Initialization and Activation State ............................. 20

4.2. Turning off the CE910 module .................................. 24

4.2.1. Turning OFF by AT Command ....................................... 24

4.2.2. Turning OFF by tying low ON_OFF* ................................ 25

4.3. Summary of Turning ON and OFF the Module ...................... 26

4.4. Hardware Unconditional Shutdown ............................... 28

5. Power Supply ..................................................... 31

5.1. Power Supply Requirements ..................................... 31

5.2. Power Consumption ............................................. 32

5.3. General Design Rules .......................................... 33

5.3.1. Electrical Design Guidelines .................................... 33

5.3.2. + 5V Input Source Power Supply Design Guidelines ................ 33

5.3.3. +12V Input Source Power Supply Design Guidelines ................ 34

5.3.4. Battery Source Power Supply Design Guidelines ................... 35

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5.3.5. Thermal Design Guidelines ....................................... 35

5.3.6. Power Supply PCB layout Guidelines .............................. 36

6. Antenna .......................................................... 38

6.1. CDMA Antenna Requirements ..................................... 38

6.2. CDMA antenna – PCB line Guidelines ............................ 39

6.3. CDMA Antenna installation Guidelines ............................ 39

7. USB Port ......................................................... 41

8. Serial Port ...................................................... 42

8.1. Modem Serial Port 1 ........................................... 43

8.2. Modem Serial Port 2 ........................................... 45

8.3. RS232 Level Translation ....................................... 46

9. Audio Section Overview ........................................... 47

9.1. Analog Audio Interface(AVI) ................................... 47

9.1.1. MIC Connection .................................................. 48

9.1.2. LIN-IN Connection ............................................... 49

9.1.3. EAR Connection .................................................. 50

9.2. Digital Voice Interface(DVI) .................................. 51

9.2.1. CODEC Example ................................................... 51

10. General Purpose I/O .............................................. 52

10.1. Logic Level Specification ................................... 53

10.2. Using a GPIO Pad as Input ................................... 53

10.3. Using a GPIO Pad as Output .................................. 54

10.4. Indication of Network Service Availability .................. 54

10.5. RTC Bypass Output ........................................... 55

10.6. VAUX/PWRMON Power Output .................................... 55

11. ADC section ...................................................... 57

11.1. Description ................................................. 57

11.2. Using ADC Converter ......................................... 57

12. Test Point ....................................................... 58

13. Mounting CE910 on the Application ................................ 59

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13.1. General ..................................................... 59

13.2. Module Finishing & Dimensions ............................... 59

13.3. Recommended foot print for the application .................. 60

13.4. Stencil ..................................................... 61

13.5. PCB Pad Design .............................................. 61

13.6. Recommendations for PCB Pad Dimensions (mm) ................. 61

13.7. Solder Paste ................................................ 63

13.7.1. Solder Reflow .................................................. 63

14. Packing System ................................................... 65

14.1. Moisture Sensibility ........................................ 67

15. Application Design Guide ......................................... 68

15.1. Download and Debug Port ..................................... 68

16. Conformity Assessment Issues(Problèmes d'évaluation de conformité) 69

17. Safety Recommendations ........................................... 73

18. Document History ................................................. 74

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1. Introduction

1.1. Scope

The aim of this document is the description of typical hardware solutions useful for developing a

product with the Telit CE910 module.

1.2. Audience

This document is intended for Telit customers who are about to implement their applications using

our CE910 modules.

1.3. Contact Information, Support

For general contact, technical support, to report documentation errors and to order manuals, contact

Telit Technical Support Center (TTSC) at:

TS-EMEA@telit.com

TS-NORTHAMERICA@telit.com

TS-LATINAMERICA@telit.com

TS-APAC@telit.com

Alternatively, use:

http://www.telit.com/en/products/technical-support-center/contact.php

For detailed information about where to buy the Telit modules or for recommendations on accessories

and components visit:

http://www.telit.com

To register for product news and announcements or for product questions contact Telit Technical

Support Center (TTSC).

Our aim is to make this guide as helpful as possible. Please keep us informed of comments and

suggestions for improvements.

Telit appreciates feedback from the users of our information.

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1.4. Document Organization

This document contains the following chapters:

Chapter 1: “Introduction” provides a scope for this document, target audience, contact and support

information, and text conventions.

Chapter 2: “General Product Description” gives an overview of the features of the product.

Chapter 3: “CE910 Module Connections” deals with the pin out configuration and layout.

Chapter 4: “Hardware Commands” How to operate the module via hardware.

Chapter 5: “Power supply” Power supply requirements and general design rules.

Chapter 6: “Antenna” The antenna connection and board layout design are the most important parts in

the full product design.

Chapter 7: “USB Port” The USB port on the Telit CE910 is the core of the interface between the

module and OEM hardware.

Chapter 8: “Serial ports” Refers to the serial ports of the Telit CE910.

Chapter 9: “Audio Section overview” Refers to the audio blocks of the Base Band Chip of the CE910

Telit Module.

Chapter 10: “General Purpose I/O” How the general purpose I/O pads can be configured.

Chapter 11: “ADC section” Deals with this one kind of converter.

Chapter 12: “Test Point” Deals with Test Point.

Chapter 13: “Mounting CE910 on the Application” Mechanical dimensions and

recommendations on how to mount the module on the user’s board.

Chapter 14: “Packing System” Deals with packing system.

Chapter 15: “Application Design Guide” Deals with the design of host system for download or

upgrade.

Chapter 16: “Conformity Assessment Issues” provides some fundamental hints about the conformity

assessment that the final application might need.

Chapter 17: “Safety Recommendation” provides some safety recommendations that must be followed

by the customer in the design of the application that makes use of the Telit CE910.

Chapter 18: “Document History” provides document revision history of the Telit CE910.

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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

 CE910 Software User Guide, 1vv0301011

 CE910 AT Commands Reference Guide, 80399ST10111A

 Telit EVK2 User Guide, 1vv0300704

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2. General Product Description

2.1. Overview

The aim of this document is the description of typical hardware solutions useful for developing a

product with the Telit CE910 module.

In this document all the basic functions of a mobile device 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 all hardware

solutions and products that may be designed. Avoiding the discussed wrong solutions must be

considered as mandatory. While the suggested hardware configurations must not be considered

mandatory, the information given must be used as a guide and a starting point for properly developing

a product with the Telit CE910 module.

NOTE:

The integration of the CDMA 1xRTT module within a user application must be done according to the

design rules described in this manual.

The information presented in this document is believed to be accurate and reliable. However, no

responsibility is assumed by Telit Communication S.p.A. for its use, such as any infringement of

patents or other rights of third parties. No license is granted by implication or otherwise under any

patent rights of Telit Communication S.p.A. other than for circuitry embodied in Telit products. This

document is subject to change without notice.

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2.2. Product Specifications

CE910 Specifications

Air Interface

CDMA 1xRTT

Frequency Bands

CE910-DUAL : 800/1900MHz

CE910-SC : 800MHz

CE910B-DUAL : 800/1900MHz (BC0/BC10/BC1)

Data Service

CDMA 1xRTT: 153.6 Kbps (full-duplex)

Max. RF out power

 CDMA BC0: Power class 3 (24.5dBm) for 1xRTT

 CDMA BC1: Power class 2 (24.5dBm) for 1xRTT

 CDMA BC10 : Power class 2 (24.5dBm) for 1xRTT

Typical conducted sensitivity

 CDMA BC0: –108dBm

 CDMA BC1: –107dBm

 CDMA BC10: -108dBm

Device dimensions

28.2mm(L) x 28.2mm(W) x 2.05mm(T)

Weight

3.7g

Storage and Operating

Temperature Range

–40 ~ +85°C

Normal operating voltage

range

3.4 ~ 4.2V

IO voltage

1.8V

Interface

 144 Land-Grid-Array interface

 10 general I/O ports maximum including multi-

functional I/Os

 State LED output

 1 A/D converter

 Full RS232 CMOS UART: baud rate up to 4Mbps

 Reserved two wires CMOS UART for debugging

 USB 2.0: baud rate up to 12Mbps

Antenna

Primary antenna, 800/1900MHz

Audio

 Analog audio interface ( 1 EAR/MIC)

Message

SMS (MO/MT)

Approvals

CE910-DUAL & CE910B-DUAL:

 Regulatory: FCC, IC

 Carrier: Verizon, Sprint, Aeris

CE910-SC:

 Regulatory: SRRC, CCC

2.3. RoHS Compliance

As a part of Telit’s corporate policy of environmental protection, the CE910 complies with the RoHS

(Restriction of Hazardous Substances) directive of the European Union (EU directive 2002/95/EG).

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3. CE910 Module Connections

3.1. Pin-Out

Signal

I/O

Function

Type

USB FS 2.0 Communication Port

B15

USB_D+

I/O

USB differential Data(+)

C15

USB_D-

I/O

USB differential Data(-)

A13

VUSB

Power for the internal USB transceiver

Asynchronous UART – Prog. / data +HW Flow Control

N15

C103/TXD

Serial data input from DTE

CMOS 1.8V

M15

C104/RXD

Serial data output to DTE

CMOS 1.8V

M14

C108/DTR

Input for (DTR) from DTE

CMOS 1.8V

L14

C105/RTS

Input for (RTS) from DTE

CMOS 1.8V

P15

C106/CTS

Output for (CTS) to DTE

CMOS 1.8V

N14

C109/DCD

Output for (DCD) to DTE

CMOS 1.8V

P14

C107/DSR

Output for (DSR) to DTE

CMOS 1.8V

R14

C125/RING

Output for (RI) to DTE

CMOS 1.8V

Asynchronous Auxiliary UART

D15

TX_AUX

Auxiliary UART (TX Data to DTE)

CMOS 1.8V

E15

RX_AUX

Auxiliary UART (RX Data from DTE)

CMOS 1.8V

RUIM Interface(*NOTE)

RUIMVCC

Reserved but applicable only to RUIM variant :

Power supply for the RUIM

1.8/3V

RUIMIO

I/O

Reserved but applicable only to RUIM variant :

RUIM Data I/O

1.8/3V

RUIMCLK

Reserved but applicable only to RUIM variant :

RUIM Clock

1.8/3V

RUIMRST

Reserved but applicable only to RUIM variant :

RUIM Reset

1.8/3V

Digital Voice interface

DVI_WA0

I/O

Digital Voice interface (WA0)

1.8V

DVI_RX

Digital Voice interface (RX)

1.8V

DVI_TX

Digital Voice interface (TX)

1.8V

DVI_CLK

I/O

Digital Voice interface (CLK)

1.8V

Analog Voice Interface

EAR+

Earphone signal output, phase +

EAR-

Earphone signal output, phase -

MIC+

Microphone input, phase +

MIC-

Microphone input, phase -

Digital IO

GPIO_01

I/O

GPIO_01 / STAT LED

CMOS 1.8V

GPIO_02

I/O

GPIO_02

CMOS 1.8V

C10

GPIO_03

I/O

GPIO_03

CMOS 1.8V

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Signal

I/O

Function

Type

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

L15

GPIO_09

I/O

GPIO_09

CMOS 1.8V

G15

GPIO_10

I/O

GPIO_10

CMOS 1.8V

ADC Section

ADC_IN1

Analog to Digital converter input

A/D

RF Section

Antenna

I/O

CDMA Antenna (50Ohm)

Miscellaneous Functions

R13

HW_SHUTDOWN*

Hardware Unconditional Shutdown

Pull up to VBATT

R12

ON_OFF*

Input Command for Power ON

CMOS 1.8V

C14

VRTC

RTC Power

Power

R11

VAUX/PWRMON

Supply Output for external accessories / Power

ON Monitor

1.8V

Test Point

TP1

Test Point

TP2

Test Point

TP3

Test Point

TP4

Test Point

TP5

Test Point

TP6

Test Point

TP7

Test Point

Power Supply

VBATT

Main Power Supply (Baseband)

Power

VBATT

Main Power Supply (Baseband)

Power

VBATT_PA

Main Power Supply (Radio PA)

Power

VBATT_PA

Main Power Supply (Radio PA)

Power

VBATT_PA

Main Power Supply (Radio PA)

Power

VBATT_PA

Main Power Supply (Radio PA)

Power

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

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Signal

I/O

Function

Type

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

GND

Ground

P10

GND

Ground

R10

GND

Ground

M12

GND

Ground

B13

GND

Ground

P13

GND

Ground

E14

GND

Ground

Reserved

A10

Reserved

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Signal

I/O

Function

Type

B10

Reserved

N10

Reserved

A11

Reserved

B11

Reserved

N11

Reserved

P11

Reserved

A12

Reserved

B12

Reserved

D12

Reserved

N12

Reserved

P12

Reserved

D13

Reserved

E13

Reserved

F13

Reserved

G13

Reserved

H13

Reserved

J13

Reserved

K13

Reserved

L13

Reserved

M13

Reserved

N13

Reserved

A14

Reserved

D14

Reserved

F14

Reserved

G14

Reserved

H14

Reserved

J14

Reserved

K14

Reserved

F15

Reserved

H15

Reserved

J15

Reserved

*NOTE:

RUIM interface is reserved for Verizon/Sprint/Aeris variants and it is applicable only to RUIM

variant of CE910 (CE910-SC).

WARNING:

Reserved pins must not be connected.

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NOTE:

The following table is listing the main Pinout differences between the CE910 variants.

Product

BC0

BC10

BC1

Notes

CE910-DUAL

Yes

Reserved pads: A3, A5, A6, A7

CE910-SC

Yes

CE910B-DUAL

Yes

Reserved pads: A3, A5, A6, A7

NOTE:

If not used, almost all pins not in use must be left disconnected. The only exceptions are the following

pins:

PAD

Signal

Notes

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 it should be connected to a Test point.

C15

USB_D-

If not used it should be connected to a Test point.

A13

VUSB

If not used it should be connected to a Test point.

N15

C103/TXD

If not used it should be connected to a Test point.

M15

C104/RXD

If not used it 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 it should be connected to a Test point.

D15

TX_AUX

If not used it should be connected to a Test point.

E15

RX_AUX

If not used it should be connected to a Test point.

Main Antenna

C3,C4,C5,C6,C7,D3,E3

Test Point

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3.1.1. LGA Pads Layout(CE910-DUAL & CE910B-DUAL)

Top View

NOTE:

The pin defined as RES must be considered RESERVED and not connected on any pin in the

application. The related area on the application has to be kept empty.

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3.1.2. LGA Pads Layout(CE910-SC)

Top View

NOTE:

The pin defined as RES must be considered RESERVED and not connected on any pin in the

application. The related area on the application has to be kept empty.

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4. Hardware Commands

4.1. Turning on the CE910 module

To turn on the CE910, the pad ON_OFF* must be tied low for at least 1.5 second and then released.

The maximum current that can be drained from the ON_OFF* pad is 0.1 mA.

A simple circuit to power on the module is illustrated below:

4.1.1. Initialization and Activation State

Upon turning on CE910 module, the CE910 module is not active yet because the boot sequence of

CE910 is still executing internally. It takes about 10 seconds to complete the initialization of the

module internally.

For this reason, it would be useless to try to access CE910 during the Initialization state as below. The

CE910 module needs at least 10 seconds after the PWRMON goes High to become operational by

reaching the activation state.

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During the Initialization state, any kind of AT-command is not available. DTE must wait for the

Activation state to communicate with CE910.

To check if the CE910 has powered on, the hardware line VAUX/PWRMON must be monitored.

When VAUX/PWRMON goes high, the module has powered on.

NOTE:

Do not use any pull up resistor on the ON_OFF* line. It is pulled up with 200kΩ internally. Using a

pull up resistor may bring latch up problems on the CE910 power regulator and improper power

on/off of the module. The line ON_OFF* must be connected only in open collector configuration.

NOTE:

In this document all the lines are inverted. Active low signals are labeled with a name that ends with

"*" or with a bar over the name.

NOTE:

In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level

signal applied to the digital pins of the CE910 module when the module is powered OFF or during an

ON/OFF transition.

For example:

1. To drive the ON_OFF* pad with a totem pole output of a +3/5 V microcontroller (uP_OUT1):

2. To drive the ON_OFF* pad directly with an ON/OFF button:

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A flow chart the proper turn on procedure is displayed below:

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A flow chart showing the AT commands managing procedure is displayed below:

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4.2. Turning off the CE910 module

Turning off the device can be done in two ways:

 via AT command (see CE910 Software User Guide, AT#SHDN)

 by tying low pin ON_OFF*

Either ways, the device issues a detach request to network informing that the device will not be

reachable any more.

To turn OFF the CE910 the pad ON_OFF* must be tied low for at least 2.5 seconds and then released.

TIP:

To check if the device has powered off, hardware line PWRMON must be monitored.

The device is powered off when PWRMON goes low.

NOTE:

In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level

signal applied to the digital pins of the CE910 when the module is powered OFF or during an

ON/OFF transition.

4.2.1. Turning OFF by AT Command

The CE910 can be shut down by a software command.

When a shutdown command is sent, the CE910 goes into the finalization state and will shut down

PWRMON at the end of this state. The period of the finalization state can vary according to the state

of the CE910 so it cannot be fixed definitely.

Normally it will be 10 seconds after sending a shutdown command and DTE should monitor the status

of PWRMON to see the actual power off.

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4.2.2. Turning OFF by tying low ON_OFF*

To turn OFF the CE910 the pad ON_OFF* must be tied low for at least 2 seconds and then released.

The same circuitry and timing for the power on must be used.

When the hold time of ON_OFF* is above 2 seconds, the CE910 goes into the finalization state and

will shut down PWRMON at the end of this state.

The period of the finalization state can vary according to the state of the CE910 so it cannot be fixed

definitely.

Normally it will be 10 seconds after releasing ON_OFF* and DTE should monitor the status of

PWRMON to see the actual power off.

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4.3. Summary of Turning ON and OFF the Module

The chart below describes the overall sequences for turning ON and OFF the module.

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The following flow chart shows the proper turn off procedure:

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4.4. Hardware Unconditional Shutdown

The Unconditional shutdown of the module could be activated using the HW_SHUTDOWN*

line(pad R13).

WARNING:

The hardware unconditional shutdown must NOT be used during normal operation of the device since

it does not detach the device from the network. It shall be used as an emergency exit procedure.

To unconditionally shutdown the CE910, the pad HW_SHUTDOWN* must be tied low for at least

800 milliseconds and then released.

NOTE:

Do not use any pull up resistor on the HW_SHUTDOWN* line nor any totem pole digital output. It is

pulled up internally to VBATT with 57kΩ. Using an external pull up resistor may bring latch up

problems on the CE910 power regulator and improper functioning of the module.

The line HW_SHUTDOWN* must be connected only in open collector configuration.

The HW_SHUTDOWN* will generate an unconditional shutdown of the module without an

automatic restart.

The module will shutdown but will NOT perform the detach from the cellular network.

To proper power on again the module please refer to 4.1 Turning ON the CE910.

TIP:

The unconditional hardware shutdown must always be implemented on the boards and the software

must use it only as an emergency exit procedure.

A simple circuit to unconditionally shutdown the module is illustrated below:

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For example:

Let us assume you need to drive the HW_SHUTDOWN* pad with a totem pole output of a +3/5 V

microcontroller (uP_OUT2):

NOTE: In order to avoid a back powering effect it is recommended to avoid having any HIGH logic

level signal applied to the digital pins of the CE910 when the module is powered OFF or during an

ON/OFF transition.

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In the following flow chart is detailed the proper restart procedure:

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5. 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’s overall performance. Read carefully the requirements and the

guidelines that follow for a proper design.

5.1. Power Supply Requirements

The external power supply must be connected to VBATT & VBATT_PA signals and must fulfill the

following requirements:

Power Supply

Nominal Supply Voltage

3.8V

Normal Operating Voltage range

3.4V ~ 4.2V

Extended Operating Voltage range

3.4V ~ 4.5V

NOTE:

The Operating Voltage Range MUST never be exceeded. Special 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.

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5.2. Power Consumption

CE910

Mode

Average

(mA)

Mode Description

Power off current (Typical)

140uA(*1)

Standby mode

No call in progress (slot cycle index=2)

AT+CFUN=1

Normal mode; full functionality of the module

AT+CFUN=4

Disabled TX and RX; modules is not registered on the

network

AT+CFUN=5

1.1(*2)

Full functionality with power saving;

Module registered on the network can receive

incoming call sand SMS

Tx and Rx mode

A call in progress

Max Power Mode

750

CDMA 1x voice/data call

(*1)The off current is the total supply current from the main battery with the XO regulator ON,

19.2MHz XO ON and others are OFF.

(*2) Standby current consumption depends on network configuration or module configuration.

The current consumption value for CFUN= 5 is measured under slot cycle index=2.

TIP:

The electrical design for the power supply should be made ensuring it will be capable of a peak

current output of at least 1A.

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5.3. 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

5.3.1. Electrical Design Guidelines

The electrical design of the power supply depends strongly on 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

5.3.2. + 5V Input Source Power Supply Design Guidelines

 The desired output for the power supply is 3.8V, hence there is not a big difference

between the input source and the desired output so a linear regulator can be used. A

switching power supply will not be suitable because of the low drop-out requirements.

 When using a linear regulator, a proper heat sink must 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 CE910. A 100μF tantalum capacitor is usually suited.

 Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is

rated at least 10V.

 A protection diode must be inserted close to the power input in order to save the CE910

from power polarity inversion.

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An example of a linear regulator with 5V input:

5.3.3. +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 suitable and must not be

used. A switching power supply would be preferable because of its better efficiency,

especially with the 1A peak current load represented by CE910.

 When using a switching regulator, a 500 kHz 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 must 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 tantalum capacitor is usually suited for this.

 Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is

rated at least 10V.

 For car applications a spike protection diode must be inserted close to the power input in

order to clean the supply from spikes.

 A protection diode must be inserted close to the power input in order to save the CE910

from power polarity inversion. This can be the same diode as for spike protection.

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

5.3.4. 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.

A single 3.7V lithium-ion cell battery type is ideal to supply power to the Telit CE910 module.

WARNING:

The three battery cells (Ni/Cd or Ni/MH 3.6V nom. battery types or 4V PB types) MUST NOT be

used directly because their maximum voltage can rise over the absolute maximum voltage for the

CE910 and cause damage. USE only Li-Ion battery types.

 A bypass low (usually a 100uF tantalum) ESR capacitor with adequate capacity must be

provided in order to cut the current absorption peaks.

 Make sure the low ESR capacitor (usually a tantalum) is rated at least 10V.

 A protection diode must be inserted close to the power input in order to protect the CE910

module from power polarity inversions when connecting the battery.

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

1A. The suggested battery capacity is from 500mAh to 1000mAh.

5.3.5. Thermal Design Guidelines

The thermal design for the power supply heat sink must be done with the following specifications:

Average current consumption during CDMA 1x @PWR level max : 750 mA

NOTE:

The average consumption during transmissions depends on the power level at which the device is

requested to transmit via the network. The average current consumption hence varies significantly.

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Considering the very low current during idle, especially if the Power Saving function is enabled, it is

possible to consider from the thermal point of view that the device absorbs current significantly only

during calls.

If we assume that the device stays in transmission for short periods of time (a few minutes) and then

remains for quite a long time in idle (one hour), then the power supply always has time to cool down

between the calls and the heat sink could be smaller than the calculated for 750mA maximum RMS

current. There could even be a simple chip package (no heat sink).

Moreover in average network conditions the device is requested to transmit at a lower power level

than the maximum and hence the current consumption will be less than 750 mA (usually around 300

mA).

For these reasons the thermal design is rarely a concern and the simple ground plane where the power

supply chip is placed can be enough to ensure a good thermal condition and avoid overheating.

The heat generated by the CE910 must be taken into consideration during transmission at 24.5dBm

max during calls. This generated heat will be mostly conducted to the ground plane under the CE910.

The application must be able to dissipate heat.

In the CDMA 1x mode, since CE910 emits RF signals continuously during transmission, special

attention must be paid to how to dissipate the heat generated.

The current consumption will be up to about 750mA in CDMA 1x continuously at the maximum TX

output power (24.5dBm). Thus, you must arrange the area on the application PCB must be as large as

possible under CE910.

The CE910 must be mounted on the large ground area of the application board and make many

ground vias to dissipate the heat.

5.3.6. Power Supply PCB layout Guidelines

As seen in the electrical design guidelines, the power supply must have a low ESR capacitor on the

output to cut the current peaks and a protection diode on the input to protect the supply from spikes

and polarity inversion. The placement of these components is crucial for the correct operation of the

circuitry. A misplaced component can be useless or can even decrease the power supply performance.

 The bypass low ESR capacitor must be placed close to the Telit CE910 power input pads,

or if the power supply is a switching type, the capacitor can be placed close to the

inductor to cut the ripple if the PCB trace from the capacitor to CE910 is wide enough to

ensure a drop-less connection even during the 1A current peaks.

 The protection diode must be placed close to the input connector where the power source

is drained.

 The PCB traces from the input connector to the power regulator IC must be wide enough

to ensure no voltage drops occur when the 1A current peaks are absorbed. While a

voltage drop of hundreds of mV may be acceptable from the power loss point of view, the

same voltage drop may not be acceptable from the noise point of view. If the application

does not have an audio interface but only uses the data feature of the Telit CE910, then

this noise is not as disruptive and the power supply layout design can be more forgiving.

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 The PCB traces to CE910 and the Bypass capacitor must be wide enough to ensure no

significant voltage drops occur when the 1A current peaks are absorbed. This is a must

for the same above-mentioned reasons. Try to keep this trace as short as possible.

 The PCB traces connecting the switching output to the inductor and the switching diode

must be kept as short as possible by placing the inductor and the diode very close to the

power switching IC (only for switching power supply). This is done in order to reduce the

radiated field (noise) at the switching frequency (usually 100-500 kHz).

 The use of a good common ground plane is suggested.

 The placement of the power supply on the board must be done in a way to guarantee that

the high current return paths in the ground plane are not overlapped with any noise

sensitive circuitry such as the microphone amplifier/buffer or earphone amplifier.

The power supply input cables must be kept separate from noise sensitive lines such as

microphone/earphone cables.

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6. Antenna

The antenna connection and board layout design are the most important parts in the full product

design and they strongly reflect on the product’s overall performance. Read carefully and follow the

requirements and the guidelines for a proper design.

6.1. CDMA Antenna Requirements

The antenna for a Telit CE910 device must fulfill the following requirements:

CE910 Specifications

Frequency range

Depending on the frequency band(s) provided by the

network operator, the customer must use the most suitable

antenna for that/those band(s)

Bandwidth

70 MHz in CDMA BC0

53 MHz in CDMA BC10

140 MHz in CDMA BC1

Gain

Gain < 5.12dBi in CDMA BC0

Gain < 5.12dBi in CDMA BC10

Gain < 6.12dBi in CDMA BC1

Impedance

50 Ohm

Input power

> 24.5dBm Average Power in CDMA

VSWR absolute max

≤ 5:1 (Limit to avoid permanent damage)

VSWR recommended

≤ 2:1 (Limit to fulfill all regulatory requirement)

When using the Telit CE910, since there’s no antenna connector on the module, the antenna must be

connected to the CE910 antenna pad (K1) by means of a transmission line implemented in the PCB.

In the case that the antenna is not directly connected at the antenna pad of the CE910, then a PCB line

is required. This transmission line shall fulfill the following requirements:

Antenna Line on PCB Requirements

Characteristic Impedance

50Ohm

Max Attenuation

0.3dB

Coupling with other signals shall be avoided

Cold End (Ground Plane) of antenna shall be equipotential to the CE910 ground pads

Furthermore if the device is developed for the US and/or Canada market, it must comply with the

FCC and/or IC approval requirements:

This device is to be used only for mobile and fixed application. The antenna(s) used for this

transmitter must be installed to provide a separation distance of at least 20 cm from all persons and

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must not be co-located or operating in conjunction with any other antenna or transmitter. End-Users

must be provided with transmitter operation conditions for satisfying RF exposure compliance. OEM

integrators must ensure that the end user has no manual instructions to remove or install the CE910

module. Antennas used for this OEM module must not exceed 5dBi gain for mobile and fixed

operating configurations.

6.2. CDMA antenna – PCB line Guidelines

 Make sure that the transmission line’s characteristic impedance is 50ohm.

 Keep line on the PCB as short as possible since the antenna line loss shall be less than around

0.3dB.

 Line geometry should have uniform characteristics, constant cross section, avoid meanders and

abrupt curves.

 Any kind of suitable geometry/structure can be used for implementing the printed transmission

line afferent the antenna.

 If a Ground plane is required in line geometry, that plane has to be continuous and sufficiently

extended so the geometry can be as similar as possible to the related canonical model.

 Keep, if possible, at least one layer of the PCB used only for the Ground plane; If possible, use

this layer as reference Ground plane for the transmission line.

 It is wise to surround (on both sides) the PCB transmission line with Ground. Avoid having

other signal tracks facing directly the antenna line track.

 Avoid crossing any un-shielded transmission line footprint with other tracks on different layers.

 The Ground surrounding the antenna line on PCB has to be strictly connected to the main

Ground plane by means of via holes (once per 2mm at least) placed close to the ground edges

facing line track.

 Place EM noisy devices as far as possible from CE910 antenna line.

 Keep the antenna line far away from the CE910 power supply lines.

 If EM noisy devices are present on the PCB hosting the CE910, such as fast switching ICs, take

care of shielding them with a metal frame cover.

 If EM noisy devices are not present around the line use of geometries like Micro strip or

Grounded Coplanar Waveguide are preferred since they typically ensure less attenuation when

compared to a Strip line having same length.

6.3. CDMA Antenna installation Guidelines

 Install the antenna in a place covered by the CDMA signal.

 If the device antenna in the application is located greater then 20cm from the human body and

there are no co-located transmitters then the Telit FCC/IC approvals can be re-used by the end

product.

 Antenna shall not be installed inside metal cases.

 Antenna shall be installed also according to antenna manufacture instructions.

WARNING:

Consider a mechanical design and a low-capacitance ESD protection device to protect CE910 or

customer specific requirements from ESD event to Antenna port (K1).

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7. USB Port

The CE910 module includes a Universal Serial Bus (USB) transceiver, which operates at USB Full-

speed (12Mbits/sec) and slave mode only.

It is compliant with the USB 2.0 specification and can be used for diagnostic monitoring, control and

data transfers.

The table below describes the USB interface signals:

Signal

I/O

Function

Type

B15

USB_D+

I/O

USB differential Data(+)

C15

USB_D-

I/O

USB differential Data(-)

A13

VUSB

Power for the internal USB transceiver

The USB_DPLUS and USB_DMINUS signals have a clock rate of 60MHz. The signal traces should

be routed carefully. Trace lengths, number of vias and capacitive loading should be minimized. The

impedance value should be as close as possible to 100 Ohms differential.

The table below describes the VUSB specification:

Parameter

Min

Max

Input voltage

4.4V

5.0V

Input current

50mA

WARNING:

Consider a mechanical design and a low-capacitance ESD protection device to protect CE910 or

customer specific requirements from ESD event to USB lines (B15, C15 and A13).

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8. Serial Port

The serial ports on the Telit CE910 are the interface between the module and OEM hardware.

2 serial ports are available on the module:

 Modem Serial Port 1 (Main)

 Modem Serial Port 2 (Auxiliary)

Several configurations can be designed for the serial port on the OEM hardware.

The most common are:

 RS232 PC comport

 Microcontroller UART@1.8V(Universal Asynchronous Receiver Transmit)

 Microcontroller UART@5V or other voltages different from 1.8V

Depending on the type of serial port on the OEM hardware, a level translator circuit may be needed to

make the system work.

On the CE910 the ports are CMOS 1.8V.

The electrical characteristics of the serial port are explained in the following tables:

Absolute Maximum Ratings -Not Functional

Parameter

Min

Max

Input level on non-power pin with respect to ground

-0.3

+2.3V

Operating Range - Interface levels (1.8V CMOS)

Parameter

Min

Max

Input high level

1.5V

2.1 V

Input low level

0.35V

Output high level

1.35V

1.8V

Output low level

0.45V

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8.1. Modem Serial Port 1

The serial port 1 on the CE910 is a +1.8V UART with all 7 RS232 signals.

It differs from the PC-RS232 in the signal polarity (RS232 is reversed) and levels.

RS232

Pin #

Signal

CE910

Pad No.

Function

Usage

C109/DCD

N14

Data Carrier Detect

Output from the CE910 that

indicates the carrier presence

C104/RXD

M15

Transmit line *see Note

Output transmit line of the CE910

UART

C103/TXD

N15

Receive line *see Note

Input receive of the CE910 UART

C108/DTR

M14

Data Terminal Ready

Input to the CE910 that controls

the DTE READY condition

GND

C107/DSR

P14

Data Set Ready

Output from the CE910 that

indicates the module is ready

C106/CTS

P15

Clear to Send

Output from the CE910 that

controls the hardware flow control

C105/RTS

L14

Request to Send

Input to the CE910 that controls

the hardware flow control

C125/RI

R14

Ring Indicator

Output from the CE910 that

indicates the incoming call

condition

The following table shows the typical value(pulled inside the baseband chipset) and status for input

lines in all module states:

Signal/State

OFF

RESET

Powersaving

PU tied to

TXD

unknown

Pull Down

(21K~210K)

Pull Up

(39K~390K)

Pull Up

(39K~390K)

1.8V

RTS

Pull Down

(21K~210K)

DTR

Pull Up

(39K~390K)

NOTE:

According to V.24, RX/TX signal names are referred to the application side. Therefore, on the CE910

side these signals are on the opposite direction:

TXD on the application side will be connected to the receive line (here named C103/TXD)

RXD in the application side will be connected to the transmit line (here named C104/RXD)

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NOTE:

For minimum implementation, only the TXD and RXD lines must be connected, the other lines can be

left open provided a software flow control is implemented.

NOTE:

In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level

signal applied to the digital pins of the CE910 when the module is powered off or during an ON/OFF

transition.

NOTE:

High-speed UART supports up to 4Mbps. Please refer to the AT command User Guide in detail.

WARNING:

Consider a mechanical design and a low-capacitance ESD protection device to protect CE910 or

customer specific requirements from ESD event to UART port (M15, N15, P15 and L14).

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8.2. Modem Serial Port 2

The secondary serial port on the CE910 is a CMOS 1.8V with only RX and TX signals.

The signals of the CE910 serial port are:

PAD

Signal

I/O

Function

Type

D15

TX_AUX

Auxiliary UART (TX data to DTE)

CMOS 1.8V

E15

RX_AUX

Auxiliary UART (RX data from DTE)

CMOS 1.8V

NOTE:

In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level

signal applied to the digital pins of the CE910 when the module is powered off or during an ON/OFF

transition.

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8.3. RS232 Level Translation

In order to interface the Telit CE910 with a PC com port or a RS232 (EIA/TIA-232) application, a

level translator is required. This level translator must:

 Invert the electrical signal in both directions

 Change the level from 0/1.8V to +/-15V

Actually, the RS232 UART 16450, 16550, 16650 & 16750 chipsets accept signals with lower levels

on the RS232 side (EIA/TIA-562), allowing a lower voltage-multiplying ratio on the level translator.

Note that the negative signal voltage must be less than 0V and hence some sort of level translation is

always required. The simplest way to translate the levels and invert the signal is by using a single chip

level translator. There is a multitude of them, differing in the number of drivers and receivers and in

the levels (be sure to get a true RS232 level translator not a RS485 or other standards). By convention

the driver is the level translator from the 0-1.8V UART to the RS232 level. The receiver is the

translator from the RS232 level to 0-1.8V UART.

In order to translate the whole set of control lines of the UART you will need:

 5 drivers

 3 receivers

An example of RS232 level adaption circuitry could be accomplished using a MAXIM transceiver

(MAX218). In this case the chipset is capable of translating directly from 1.8V to the RS232 levels

(Example on 4 signals only).

The RS232 serial port lines are usually connected to a DB9 connector with the following layout:

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9. Audio Section Overview

The CE910 provides an analog audio interface and digital audio interface.

9.1. Analog Audio Interface(AVI)

The CE910 provides an analog audio interface; one differential input for audio to be

transmitted(Uplink) and a balanced output for audio to be received(Downlink).

The bias for the microphone has to be as clean as possible; the first connection (single ended) is

preferable since the Vmic noise and ground noise are fed into the input as common mode and then

rejected. This sounds strange; usually the connection to use in order to reject the common mode is the

balanced one. In this situation we have to recall that the microphone is a sound to current transducer,

so the resistor is the current to tension transducer, so finally the resistor feeds the input in balanced

way even if the configuration, from a microphone point of view, seems to be un-balanced.

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9.1.1. MIC Connection

If a “balanced way” is anyway desired, much more care has to be taken to VMIC noise and ground

noise.

TIP: Since the J-FET transistor inside the microphone acts as RF-detector-amplifier, ask vendor for a

microphone with anti-EMI capacitor (usually a 33pF or a 10pF capacitor placed across the output

terminals inside the case).

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9.1.2. LIN-IN Connection

If the audio source is not a mike but a different device, the following connections can be done. Place

100nF capacitor in series with both inputs, so the DC current is blocked. Place the 33pF-100Ohm-

33pF RF-filter, in order to prevent some EMI field to get into the high impedance high gain MIC

inputs. Since the input is differential, the common mode voltage noise between the two (different)

grounds is rejected, provided that both AF_IN+ & AF_IN- are connected directly onto the source.

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9.1.3. EAR Connection

The audio output of the CE910 is balanced, this is helpful to double the level and to reject common

mode (click and pop are common mode and therefore rejected). These outputs can drive directly a

small loudspeaker with electrical impedance not lower than 32Ohm.

TIP: in order to get the maximum audio level at a given output voltage level (dBspl/Vrms), the

following breaking through procedure can be used. Have the loudspeaker as close as you can to the

listener (this simplify also the echo cancelling); choose the loudspeaker with the higher sensitivity

(dBspl per W); choose loudspeakers with the impedance close to the limit in order to feed more

power inside the transducer (it increases the W/Vrms ratio). If this were not enough, an external

amplifier should be used.

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9.2. Digital Voice Interface(DVI)

The product is providing one Digital Audio Interface (DVI) on the following Pins:

Signal

I/O

Function

Type

DVI_WA0

I/O

Digital Voice interface (WA0)

1.8V

DVI_RX

Digital Voice interface (RX)

DVI_TX

Digital Voice interface (TX)

DVI_CLK

I/O

Digital Voice interface (CLK)

9.2.1. CODEC Example

Please refer to the Digital Voice Interface Application note.

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10. General Purpose I/O

The CE910 module is provided by a set of Digital Input / Output pins

Input pads can only be read; they report the digital value (high or low) present on the pad at the read

time.

Output pads can only be written or queried and set the value of the pad output.

An alternate function pad is internally controlled by the CE910 firmware and acts depending on the

function implemented.

The following GPIOs are available on the CE910:

Signal

I/O

Function

Type

Default

State

Note

GPIO_01

I/O

Configurable GPIO

CMOS 1.8V

INPUT

Alternate function

STAT_LED

GPIO_02

I/O

Configurable GPIO

CMOS 1.8V

INPUT

C10

GPIO_03

I/O

Configurable GPIO

CMOS 1.8V

INPUT

C11

GPIO_04

I/O

Configurable GPIO

CMOS 1.8V

INPUT

B14

GPIO_05

I/O

Configurable GPIO

CMOS 1.8V

INPUT

C12

GPIO_06

I/O

Configurable GPIO

CMOS 1.8V

INPUT

C13

GPIO_07

I/O

Configurable GPIO

CMOS 1.8V

INPUT

K15

GPIO_08

I/O

Configurable GPIO

CMOS 1.8V

INPUT

L15

GPIO_09

I/O

Configurable GPIO

CMOS 1.8V

INPUT

G15

GPIO_10

I/O

Configurable GPIO

CMOS 1.8V

INPUT

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10.1. Logic Level Specification

Where not specifically stated, all the interface circuits work at 1.8V CMOS logic levels.

The following table shows the logic level specifications used in the CE910 interface circuits:

Absolute Maximum Ratings -Not Functional

Parameter

Min

Max

Input level on any digital pin (CMOS 1.8) with respect to ground

-0.3V

2.3V

Operating Range - Interface levels (1.8V CMOS)

Parameter

Min

Max

Input high level

1.5V

2.1V

Input low level

0.0V

0.35V

Output high level

1.35V

1.8V

Output low level

0.0V

0.45V

Current characteristics

Parameter

Typical

Output Current

2mA

Input Current

30uA

10.2. Using a GPIO Pad as Input

The GPIO pads, when used as inputs, can be connected to a digital output of another device and report

its status, provided this device has interface levels compatible with the 1.8V CMOS levels of the

GPIO.

If the digital output of the device to be connected with the GPIO input pad has interface levels

different from the 1.8V CMOS, then it can be buffered with an open collector transistor with a 47KΩ

pull-up resistor to 1.8V.

NOTE:

In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level

signal applied to the digital pins of the module when it is powered OFF or during an ON/OFF

transition.

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10.3. Using a GPIO Pad as Output

The GPIO pads, when used as outputs, can drive 1.8V CMOS digital devices or compatible hardware.

When set as outputs, the pads have a push-pull output and therefore the pull-up resistor may be

omitted.

10.4. Indication of Network Service Availability

The STAT_LED pin status shows information on the network service availability and Call status. In

the CE910 modules, the STAT_LED usually needs an external transistor to drive an external LED.

Because of the above, the status indicated in the following table is reversed with respect to the pin

status:

LED status

Device Status

Permanently off

Device off

Fast blinking

(Period 1s, Ton 0,5s)

Net search / Not registered / turning off

Slow blinking

(Period 3s, Ton 0,3s)

Registered full service

Permanently on

a call is active

A schematic example could be:

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10.5. RTC Bypass Output

The VRTC pin brings out the Real Time Clock supply but it is NOT separate from the rest of the

digital part. So unlike other Telit’s products, CE910 series cannot support RTC function if VBATT is

not supplied. In this reason xE910 RTC Backup Application Note is NOT valid for CE910.

In summary in order to use RTC function with CE910, VBATT must be supplied from the application.

VRTC also supplies reference power to help CE910 check the time from SMPL (Sudden Momentary

Power Loss).

So it is recommended as best practice to connect VRTC to a shunt capacitor (VRTC to GND) and the

acceptable capacitor value is:

Parameter

Min

Keep-alive capacitor

on Pad no. = C14

6.8uF

NOTE:

VBATT must be supplied in order to use RTC function.

NOTE:

It is recommended to add a keep-alive capacitor on VRTC.

WARNING:

NO devices must be powered from this pin.

10.6. VAUX/PWRMON Power Output

A regulated power supply output is provided in order to supply small devices from the module. This

output is active when the module is ON and goes OFF when the module is shut down. The operating

range characteristics of the supply are:

Operating Range – VAUX/PWRMON power supply

Parameter

Min

Typical

Max

Output voltage

1.77V

1.8V

1.83V

Output current

200mA

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Output bypass capacitor

(Inside the module)

2.2μF

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11. ADC section

11.1. Description

The on board ADC is 12-bit converter. It is able to read a voltage level in the range of 0 ~ 1.2 volts

applied on the ADC pin input and store and convert it into 12 bit word.

Parameter

Min

Max

Units

Input Voltage range

1.2

Volt

AD conversion

bits

Resolution

< 1

Input Resistance

Mohm

The CE910 provides one Analog to Digital Converter.

The input line is named as ADC_IN1 and it is available on pad B1.

11.2. Using ADC Converter

An AT command is available to use the ADC function.

The command is AT#ADC=1,2. The read value is expressed in mV

Refer to SW User Guide or AT Commands Reference Guide for the full description of this function.

WARNING:

The ADC value read by AT command may present a certain level when it’s open(not loaded). It is not

an actual error and the ADC value is valid only if any input is asserted to ADC_IN1

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12. Test Point

These pins are needed in order to analyze CE910 on the application board.

The signals of the CE910 are:

PAD

Signal

I/O

Function

Type

TP1

Test Point

TP2

Test Point

TP3

Test Point

TP4

Test Point

TP5

Test Point

TP6

Test Point

TP7

Test Point

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13. Mounting CE910 on the Application

13.1. General

The CE910 has been designed in order to be compliant with a standard lead-free SMT process.

13.2. Module Finishing & Dimensions

The CE910 overall dimensions are:

 Length : 28.2 mm

 Width : 28.2 mm

 Thickness : 2.05 mm

 Weight : 4.7 g

Top view Bottom view

(Dimensions in mm)

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13.3. Recommended foot print for the application

144 pins

< Top View >

In order to easily rework the CE910 it is suggested to consider having a 1.5 mm placement inhibit

area around the module on the application.

It is also suggested, as a common rule for an SMT component, to avoid having a mechanical part of

the application in direct contact with the module.

NOTE:

In the customer application, the region under WIRING INHIBIT (see figure) must be clear from

signal or ground paths.

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13.4. Stencil

Stencil’s apertures layout can be the same as the recommended footprint (1:1). A suggested thickness

of stencil foil ≥ 120 µm.

13.5. PCB Pad Design

Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB.

PCB

Solder maskCopper pad

Solder Mask Defined

Copper pad

Non Solder Mask Defined

13.6. Recommendations for PCB Pad Dimensions (mm)

The recommendation for the PCB pads dimensions are described in the following image(dimensions

in mm)

It is not recommended to place via or micro-via not covered by solder resist in an area of 0.3 mm

around the pads unless it carries the same signal as the pad itself (see following figure).

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Holes in pad are allowed only for blind holes and not for through holes.

Recommendations for PCB Pad Surfaces:

Finish

Layer thickness (um)

Properties

Electro-less Ni / Immersion Au

3 ~ 7 / 0.05 ~ 0.15

good solder ability protection,

high shear force values

The PCB must be able to resist the higher temperatures which are occurring at the lead-free process.

This issue should be discussed with the PCB-supplier. Generally, the wettability of tin-lead solder

paste on the described surface plating is better compared to lead-free solder paste.

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13.7. Solder Paste

Lead free

Solder Paste

Sn/Ag/Cu

We recommend using only “no clean” solder paste in order to avoid the cleaning of the modules after

assembly.

13.7.1. Solder Reflow

The following is the recommended solder reflow profile:

Profile Feature

Pb-Free Assembly

Average ramp-up rate (TL to TP)

3℃/second max

Preheat

- Temperature Min (Tsmin)

- Temperature Max (Tsmax)

- Time (min to max) (ts)

150℃

200℃

60 ~ 180 seconds

Tsmax to TL

- Ramp-up Rate

3℃/second max

Time maintained above:

- Temperature (TL)

- Time (tL)

217℃

60 ~150 seconds

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Profile Feature

Pb-Free Assembly

Peak Temperature (TP)

245 +0/-5℃

Time within 5℃ of actual Peak Temperature (tP)

10 ~30 seconds

Ramp-down Rate

6 ℃/sec max

Time 25℃ to Peak Temperature

8 minutes max

NOTE:

All temperatures refer to topside of the package, measured on the package body surface.

WARNING:

The CE910 module withstands one reflow process only.

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14. Packing System

The CE910 modules are packaged on trays of 20 pieces each. These trays can be used in SMT

processes for pick & place handling.

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14.1. Moisture Sensibility

The CE910 is a Moisture Sensitive Device level 3, in accordance with standard IPC/JEDEC J-STD-

020, take care all the relative requirements for using this kind of components.

Moreover, the customer has to take care of the following conditions:

a) Calculated shelf life in sealed bag: 12 months at < 40°C and 90% relative humidity (RH).

b) Environmental condition during the production: 30°C / 60% RH according to IPC/JEDEC J-STD-

033A paragraph 5.

c) The maximum time between the opening of the sealed bag and the reflow process must be

168hours if condition b) “IPC/JEDEC J-STD-033A paragraph 5.2” is respected

d) Baking is required if conditions b) or c) are not respected

e) Baking is required if the humidity indicator inside the bag indicates 10% RH or more

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15. Application Design Guide

15.1. Download and Debug Port

One of the following options should be chosen in the design of host system in order to download or

upgrade the Telit’s software and debug CE910 when CE910 is already mounted on a host system.

CASE I:

Users who use both of UART and USB interfaces to communicate with CE910

- Must implement a download method in a host system for upgrading CE910 when it’s mounted.

CASE II:

Users who use USB interface only to communicate with CE910

- Must arrange UART port in a host system for debugging or upgrading CE910 when it’s mounted.

CASE III:

Users who use UART interface only to communicate with CE910

- Must arrange USB port in a host system for debugging or upgrading CE910 when it’s mounted.

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16. Conformity Assessment Issues(Problèmes

d'évaluation de conformité)

The CE910 is FCC/IC Approved as module to be installed in other devices. This device should be

used only for fixed and mobile applications and if the final product after integration is intended for

portable use, a new application and FCC is required.

Le CE910 est approuvé FCC/IC comme module à installer dans d'autres dispositifs. Ce dispositif doit

être utilisé uniquement pour des applications fixes et mobiles et si le produit fini est prévu après

intégration pour un usage portatif, une nouvelle application et la FCC est requise

The user is cautioned that this device should be used only as specified within this manual to meet RF

exposure requirements.

L'utilisateur est averti que ce dispositif doit être utilisé uniquement comme spécifié dans ce manuel

pour répondre aux normes d'exposition aux ondes rf.

Use of this device in a manner inconsistent with this manual could lead to excessive RF exposure

conditions.

L'utilisation de ce dispositif en quelque sorte contradictoire avec ce manuel a pu mener aux états

excessifs d'exposition de rf.

The CE910 is conforming to the following US Directives:

• Use of RF Spectrum. Standards: FCC47 Part 22&24

• EMC Standards: FCC47 Part 15

Le CE910 est conforme aux directives suivantes des USA

• Utilisation de spectre de rf. Normes : FCC47 partie 22&24

• Normes d'EMC : FCC47 partie 15

This device complies with Part 15 of the FCC Rules and complies with industry Canada license-

exempt RSS standard(s)

Ce dispositif est conforme à la partie 15 des règles FCC et est conforme avec l'industrie au Canada

exempts de licence standard RSS (s)

Operation is subject to the following two conditions:

(1) This device may not cause harmful interference, and

(2) This device must accept any interference, including interference that may cause undesired

operation of the device.

Le fonctionnement est sujet aux deux conditions suivantes :

(1) ce dispositif peut ne pas causer l'interférence nocive, et

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(2) ce dispositif doit accepter aucune interférence, y compris un interférence qui pourrait

causer le fonctionnement non désiré du dispositif.

The user must refer to below information to meet the FCC/IC's RF exposure rules and regulations

when they design:

Lors de la conception, l'utilisateur doit se référer à l'information ci-dessous pour remplir les

conditions et règlementations FCC/IC' d’exposition aux ondes RF:

• The system antenna(s) used for this transmitter must be installed to provide a separation

distance of at least 20 cm from all the persons and must not be co-located or operating in

conjunction with any other antenna or transmitter.

Le système d’antenne utilisé pour cet émetteur doit être installé à une distance d’au moins de

20 cm de toute personne et ne doit pas être co-implanté ou opérer en même temps que

n'importe quelle autre antenne ou émetteur.

• The system antenna(s) used for this module must not exceed 5.12dBi in CDMA BC0&BC10

and 6.12dBi in CDMA BC1 for mobile and fixed or mobile operating configurations.

Le système d’ antenne utilisé pour ce module ne doit pas dépasser 5.12dBi en CDMA

BC0&BC10 et 6.12dBi en CDMA BC1 pour des configurations mobiles et fixes ou des

configurations opérant en mode mobile.

• Users and installers must be provided with antenna installation instructions and transmitter

operating conditions for satisfying RF exposure compliance.

Manufacturers of mobile, fixed or portable devices incorporating this module are advised to

clarify any regulatory questions and to have their complete product tested and approved for

FCC compliance.

Les instructions d’installation de l’antenne ainsi que les conditions de fonctionnement de

l’émetteur doivent être remis aux utilisateurs et aux installateurs conformément à la

règlementation sur l’exposition aux ondes rf. Des fabricants des dispositifs mobiles, fixes ou

portables incorporant ce module sont invités à clarifier toutes les questions de normalisation

et à avoir leur produit complètement testé pour la mise en conformité FCC.

• CE910 is intended for the OEM integrator only.

CE910 est prévu pour l'intégrateur OEM seulement.

• The user is required to see the Grant of Equipment document for other restrictions.

L'utilisateur doit se referrer au document « Grant of equipment » pour d'autres restrictions.

• CE910 must be operated and used with a locally approved access point.

CE910 doit être actionné et utilisé avec un point d'accès localement approuvé.

• The radio transmitters (CE910-DUAL IC ID: 5131A-CE910DUAL & CE910B-DUAL IC ID:

5131A-CE910BDUAL) have been approved by Industry Canada to operate with the antenna

type listed in this manual with the maximum permissible gain and required antenna

impedance for each antenna type indicated. Antenna types not included in this list, having a

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gain greater than the maximum gain indicated for that type, are strictly prohibited for use

with this device.

L'émetteur radio (CE910-DUAL identification d'IC : 5131A-CE910DUAL & CE910B-

DUAL identification d'IC : 5131A-CE910BDUAL) a été approuvé par Industry Canada pour

fonctionner avec le type d'antenne énuméré dans ce manuel avec le gain autorisé maximum et

l'impédance d’antenne exigée pour chaque type d'antenne indiqué. Les types d'antenne non

inclus dans cette liste, ayant un gain supérieur au gain maximum indiqué pour ce type, sont

strictement interdits pour un usage avec ce dispositif.

The following regulatory and safety notices must be published in documentation supplied to the

end user of the product or system incorporating an adapter in compliance with local regulations.

• Host system including CE910 must be labeled with

“Contains transmitter module with

CE910-DUAL FCC ID: RI7CE910-DUAL and IC ID: 5131A-CE910DUAL

CE910B-DUAL FCC ID: RI7CE910B-DUAL and IC ID: 5131A-CE910BDUAL”

Les notices de normalisation et de sécurité doivent se trouver dans la documentation fournie à

l'utilisateur du produit ou du système incorporant un adaptateur conforme aux règlementations

locales.

• Le système hôte comprenant CE910 doit être marqué avec « Contient un module

émetteur avec

CE910-DUAL IDENTIFICATION FCC : RI7CE910-DUAL et identification IC :

5131A-CE910DUAL

CE910B-DUAL IDENTIFICATION FCC : RI7CE910B-DUAL et identification IC :

5131A-CE910BDUAL »

NOTE:

This equipment has been tested and found to comply with the limits for a Class B digital device,

pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection

against harmful interference in a residential installation. This equipment generates, uses and can

radiate radio frequency energy and, if not installed and used in accordance with the instructions, may

cause harmful interference to radio communications. However, there is no guarantee that interference

will not occur in a particular installation. If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the equipment off and on, the user is

encouraged to try to correct the interference by one or more of the following measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected

•Consult the dealer or an experienced radio/TV technician for help.

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WARNING:

Changes or modifications to this equipment not expressly approved by the party responsible for

compliance could void the user’s authority to operate the equipment.

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17. Safety Recommendations

READ CAREFULLY

Be sure the use of this product is allowed in the country and in the environment required. The use of

this product may be dangerous and has to be avoided in the following areas:

 Where it can interfere with other electronic devices in environments such as hospitals, airports,

aircrafts, etc.

 Where there is risk of explosion such as gasoline stations, oil refineries, etc. It is the

responsibility of the user to enforce the country’s regulations and the specific environmental

regulation.

Do not disassemble the product; any evidence of tampering will compromise the warranty validity.

Follow the instructions of the hardware user guides for a correct wiring of the product. The product

has to be supplied with a stabilized voltage source and the wiring has to conform to the security and

fire prevention regulations. The product has to be handled with care, avoiding any contact with the

pads because electrostatic discharges may damage the product itself.

The system integrator is responsible for the functioning of the final product; therefore, care has to be

taken with the external components of the module as well as of any project or installation issue

because of the risk of disturbing the CDMA network or external devices or having impact on security.

Should there be any doubt, please refer to the technical documentation and the regulations in force.

Every module has to be equipped with a proper antenna with specific characteristics. The antenna has

to be installed with care in order to avoid any interference with other electronic devices and has to

guarantee a minimum distance from the body (20 cm). In case this requirement cannot be satisfied,

the system integrator has to assess the final product against SAR regulations.

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18. Document History

Revision

Date

Changes

2012-07-12

Initial release for MKT sample

2012-08-06

8.1 Modem Serial Port1: added input resistances for input lines

10.5 RTC Bypass Output : updated application information

2012-12-20

2.2 Product Specifications updated : Device dimensions

3.1 Pin-out : Auxiliary UART and RUIM IF added,

LGA Pads Layout updated

4.2 Turning off the CE910 updated

4.4 Hardware Unconditional Shutdown updated

5.1 Power Supply Requirement updated

7 USB Port updated

8 Serial Port updated

12.2 Module Finishing & Dimensions updated

13. Packing System updated

13.1 Moisture Sensibility updated

14. Application Design Guide updated

2013-04-08

5.1 Power Supply Requirement updated : added the extended

operating voltage range

8.1 Modem Serial Port updated

9. Audio section overview updated

Added information for CE910-SC

14. Application Design Guide updated

2013-04-16

12.4 Stencil updated

2013-06-03

2.2 Product Specifications

- Storage and Operating Temperature Range updated

2013-12-12

2.2 Product Specification update

9.1.1 MIC Connection update.

10.5 RTC Bypass Output : updated application information

12.7 Solder reflow information updated

15 Conformity Assessment Issues update

2014-08-13

2.2 Product Specification update :Device weight

4.1 Turning on the CE910 updated

4.2 Turning off the CE910 updated

4.4 Hardware Unconditional Shutdown updated

5.2 Power consumption updated

11. ADC section updated

2014-11-10

3.1 Pin Out updated

10.5 RTC Bypass output updated

12. Test Point updated

12.2 Module Finishing & Dimensions

2015-02-09

3.1 Pin Out updated

2015-05-15

8.1 Modem Serial Port updated

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2015-10-27

Added CE910B-DUAL

Telit Communications S p A CE910B-DUAL CDMA Module User Manual CE910 Family Hardware User Guide

Telit Communications S.p.A. CDMA Module CE910 Family Hardware User Guide

User Manual

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