Telit Communications S p A GE865 User Manual

GE865 Hardware User Guide

1vv0300799 Rev.6 - 04.06.09

Contents

GE865 Hardware User Guide

1vv0300799 Rev.6 - 04/06/09

1 Overview ........................................................................................................................... 5

2 GE865 Mechanical Dimensions....................................................................................... 6

3 GE865 module connections ............................................................................................ 7

3.1 PIN-OUT ................................................................................................................................ 7

3.1.1

BGA Balls Layout ........................................................................................................................... 10

4 Hardware Commands .................................................................................................... 11

4.1 Turning ON the GE865 ....................................................................................................... 11

4.2 Turning OFF the GE865 ..................................................................................................... 14

4.2.1

Hardware shutdown ....................................................................................................................... 14

4.2.2

Hardware Unconditional Restart .................................................................................................... 15

5 Power Supply.................................................................................................................. 17

5.1 Power Supply Requirements ............................................................................................ 17

5.2 Power Consumption .......................................................................................................... 18

5.3 General Design Rules ........................................................................................................ 19

5.3.1

Electrical Design Guidelines .......................................................................................................... 19

5.3.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 19

5.3.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 20

5.3.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 22

5.3.2

Thermal Design Guidelines ........................................................................................................... 23

5.3.3

Power Supply PCB layout Guidelines ........................................................................................... 24

6 Antenna ........................................................................................................................... 25

6.1 GSM Antenna Requirements ............................................................................................. 25

6.2 GSM Antenna - PCB line Guidelines................................................................................. 26

6.3 GSM Antenna - Installation Guidelines ............................................................................ 27

7 Logic level specifications .............................................................................................. 28

7.1 Reset signal ....................................................................................................................... 29

8 Serial Ports ..................................................................................................................... 30

8.1 MODEM SERIAL PORT ...................................................................................................... 30

8.2 RS232 level translation ...................................................................................................... 32

8.3 5V UART level translation ................................................................................................. 35

9 Audio Section Overview ................................................................................................ 37

9.1 Microphone Paths Characteristic and Requirements ..................................................... 37

10 OUTPUT LINES (Speaker) .............................................................................................. 38

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10.1 Short description ............................................................................................................... 38

10.2 Output Lines Characteristics ............................................................................................ 38

11 General Purpose I/O ....................................................................................................... 39

11.1 GPIO Logic levels .............................................................................................................. 40

11.2 Using a GPIO Pad as INPUT .............................................................................................. 41

11.3 Using a GPIO Pad as OUTPUT .......................................................................................... 41

11.4 Using the RF Transmission Control GPIO4 ..................................................................... 41

11.5 Using the RFTXMON Output GPIO5 ................................................................................. 41

11.6 Using the Alarm Output GPIO6 ......................................................................................... 42

11.7 Using the Buzzer Output GPIO7 ....................................................................................... 42

11.8 Indication of network service availability ......................................................................... 43

11.9 RTC Bypass out ................................................................................................................. 44

11.10 External SIM Holder Implementation ............................................................................ 44

12 DAC and ADC section .................................................................................................... 45

12.1 DAC Converter ................................................................................................................... 45

12.1.1 Description ..................................................................................................................................... 45

12.1.2 Enabling DAC ................................................................................................................................ 46

12.1.3 Low Pass Filter Example ............................................................................................................... 46

12.2 ADC Converter ................................................................................................................... 47

12.2.1 Description ..................................................................................................................................... 47

12.2.2 Using ADC Converter .................................................................................................................... 47

12.3 Mounting the GE865 on your Board ................................................................................. 48

12.3.1 General .......................................................................................................................................... 48

12.3.2 Module finishing & dimensions ...................................................................................................... 48

12.3.3 Suggested Inhibit Area .................................................................................................................. 49

12.3.4 Debug of the GE865 in production ................................................................................................ 50

12.3.5 Stencil ............................................................................................................................................ 50

12.3.6 PCB pad design ............................................................................................................................. 51

12.3.7 Solder paste ................................................................................................................................... 52

12.3.8 GE865 Solder reflow ...................................................................................................................... 53

12.4 Packing system .................................................................................................................. 54

12.4.1 Moisture sensibility ........................................................................................................................ 55

13 Conformity Assessment Issues .................................................................................... 56

14 SAFETY RECOMMANDATIONS ..................................................................................... 57

15 Document Change Log .................................................................................................. 58

GE865 Hardware User Guide

1vv0300799 Rev.6 - 04/06/09

DISCLAIMER

The information contained in this document is the proprietary information of Telit Communications S.p.A. and its affiliates (“TELIT”). The contents are confidential and any disclosure to persons other than the officers, employees, agents or subcontractors of the owner or licensee of this document, without the prior written consent of Telit, is strictly prohibited.

Telit makes every effort to ensure the quality of the information it makes available. Notwithstanding the foregoing, Telit does not make any warranty as to the information contained herein, and does not accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the information.

Telit disclaims any and all responsibility for the application of the devices characterized in this document, and notes that the application of the device must comply with the safety standards of the applicable country, and where applicable, with the relevant wiring rules.

Telit reserves the right to make modifications, additions and deletions to this document due to typographical errors, inaccurate information, or improvements to programs and/or equipment at any time and without notice. Such changes will, nevertheless be incorporated into new editions of this application note.

GE865

QUAD

GE865 Hardware User Guide

1vv0300799 Rev.6 - 04/06/09

1 Overview

The aim of this document is the description of some hardware solutions useful for developing a product with the

Telit GE865-QUAD 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 GE865-QUAD module. For further hardware details that may not be explained in this document refer to the Telit GE865 Product Description document where all the hardware information is reported.

NOTICE

(EN) The integration of the GSM/GPRS according to the design rules described in this manual.

(IT) L’integrazione del modulo cellulare GSM/GPRS dovrà rispettare le indicazioni progettuali descritte in questo manuale.

(DE) Die integration des diesem Dokument beschriebenen Kunstruktionsregeln erfolgen

GE865-QUAD

(SL) Integracija GSM/GPRS navodila, opisana v tem piročniku.

GE865-QUAD

(SP) La utilización del modulo GSM/GPRS sido deseñado descritos en este manual del usuario.

(FR) L’intégration du module cellulaire GSM/GPRS faite selon les règles de conception décrites dans ce manuel.

GE865-QUAD

GSM/GPRS Mobilfunk-Moduls in ein Gerät muß gemäß der in

modula v uporabniški aplikaciji bo morala upoštevati projektna

GE865-QUAD

cellular module within user application shall be done

GE865-QUAD

debe ser conforme a los usos para los cuales ha

GE865-QUAD

all’interno dell’applicazione dell’utente

dans l’application de l’utilisateur sera

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.

GE865 Hardware User Guide

1vv0300799 Rev.6 - 04/06/09

2 GE865 Mechanical Dimensions

The Telit GE865-QUAD module overall dimension are:

• Length: 22 mm

• Width: 22 mm

• Thickness: 3.0 mm

GE865 Hardware User Guide

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3 GE865 module connections

3.1 PIN-OUT

Ball Signal I/O Function Note Type

Audio

EAR- AO Earphone signal output, phase - Audio

EAR+ AO Earphone signal output, phase + Audio

MIC+ AI Mic.signal input; phase+ Audio

MIC- AI Mic.signal input; phase- Audio

SIM card interface

SIMCLK O External SIM signal – Clock 1,8 / 3V

SIMRST O External SIM signal – Reset 1,8 / 3V

SIMIO I/O External SIM signal – Data I/O 4.7K Pull up 1,8 / 3V

SIMIN I External SIM signal – Presence (active low) 1,8 / 3V

SIMVCC - External SIM signal – Power supply for the SIM 1,8 / 3V

Trace

TXD_AUX O Auxiliary UART (TX Data) CMOS 2.8V

RXD_AUX I Auxiliary UART (RX Data) CMOS 2.8V

Prog. / Data + HW Flow Control

C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V

C104/RXD O Serial data output to DTE CMOS 2.8V

C108/DTR I

C105/RTS I

C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V

C109/DCD O

C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V

C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V

DAC_OUT AO Digital/Analog converter output D/A

ADC_IN1 AI Analog/Digital converter input A/D

ADC_IN2 AI Analog/Digital converter input A/D

RESET* I Reset input

VRTC AO VRTC Backup capacitor Power

STAT_LED O Status indicator led CMOS 1.8V

ON_OFF* I

Input for Data terminal ready signal (DTR) from DTE Input for Request to send signal (RTS) from DTE

Output for Data carrier detect signal (DCD) to DTE

DAC and ADC

Miscellaneous Functions

Input command for switching power ON or OFF (toggle command).

CMOS 2.8V CMOS 2.8V

CMOS 2.8V

47K Pull Up Pull up to VRTC

GE865 Hardware User Guide

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Ball Signal I/O Function Note Type

PWRMON O Power ON Monitor CMOS 2.8V

Antenna O Antenna output – 50 ohm RF

Service pin shall be used to upgrade the module from ASC1 (RXD AUX, TXD_AUX).

Service I

GPIO_01 I/O GPIO01 Configurable GPIO CMOS 2.8V

GPIO_02 / JDR I/O GPIO02 I/O pin / Jammer Detect Report CMOS 2.8V

GPIO_03 I/O GPIO03 GPIO I/O pin CMOS 2.8V

GPIO_04 / TX_DISAB I/O GPIO04 Configurable GPIO / TX Disable input CMOS 2.8V

GPIO_05 / RFTXMON I/O

GPIO_06 / ALARM I/O GPIO06 Configurable GPIO / ALARM CMOS 2.8V

GPIO_07 / BUZZER I/O GPIO07 Configurable GPIO / Buzzer CMOS 2.8V

GPIO_08 I/O GPIO08 Configurable GPIO CMOS 2.8V

GPIO_09 I/O GPIO09 4.7 K Pull Up Open Drain

GPIO_10 I/O GPIO10 4.7 K Pull Up Open Drain

VBATT - Main power supply (Baseband) Power

VBATT_PA - Main power supply (Radio PA) Power

GND - Ground Power

The pin shall be tied low to enable the feature only in case of a Reflashing activity. It is required, for debug purpose, to be connected to a test pad on the final application.

GPIO

GPIO05 Configurable GPIO / Transmitter ON monitor

Power Supply

RESERVED

CMOS 2.8V

pin signal

F1,F2,F3

G1, C2, C7, E5, E7, G5, G4,

GE865 Hardware User Guide

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NOTE: RESERVED pins must not be connected

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

pins:

VBATT &

VBATT_PA

GND

G3, H3, H6

ON/OFF*

TXD

RESET*

RXD

RTS1 TXD_AUX RXD_AUX

Service

RTS should be connected to the GND ( on the module side) if flow control is not used

AUDIO

SIM CAR

ANTENNA

UART

DAC and ADC

MISCELLANEOUS

GPIO

POWER SUPPLY VBATT

POWER SUPPLY GND

RESERVED

GE865 Hardware User Guide

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3.1.1 BGA Balls Layout

TOP VIEW

A B C D E F G H

C105 /

RTS

C106/CTS C107/DSR GND GPIO_02 PWRMON

C103_TXD C108/DTR - GPIO_01 GPIO_10

C104/RXD C125/RING - GPIO_08 GPIO_03 GPIO_09 GND

SIMCLK C109/DCD - - GND ADC1 GND ANT

SIMIO - - - - ADC2 GPIO_07 GND

SIMVCC SIMIN GND - GND - DAC GPIO_04

ON_OFF RESET* TXD_AUX RXD_AUX VBATT GND SERVICE

VBATT_P

GPIO_05 VRTC

GND GND

SIMRST MIC+ MIC- EAR+ EAR- - STATLED GPIO_06

LEGENDA:

NOTE: The pin defined as H4 has to be considered RESERVED and not connected on any pin in the

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

GE865 Hardware User Guide

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4 Hardware Commands

4.1 Turning ON the GE865

To turn on the GE865 the pad ON# must be tied low for at least 1 seconds and then released. The maximum current that can be drained from the ON# pad is 0,1 mA. A simple circuit to do it is:

ON#

Power ON impulse

GND

NOTE: don't use any pull up resistor on the ON# line, it is internally pulled up. Using pull up resistor may bring to latch up problems on the GE865 power regulator and improper power on/off of the module. The line ON# must be connected only in open collector configuration.

NOTE: In this document all the lines that are inverted, hence have active low signals are labeled with a name that ends with”#" or with a bar over the name.

TIP: To check if the device has powered on, the hardware line PWRMON should be monitored. After 900ms the line raised up the device could be considered powered on.

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

GE865 Hardware User Guide

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GE865 Hardware User Guide

1vv0300799 Rev.6 - 04/06/09

For example: 1- Let's assume you need to drive the ON# pad with a totem pole output of a +3/5 V microcontroller (uP_OUT1):

10k

2- Let's assume you need to drive the ON# pad directly with an ON/OFF button:

GE865 Hardware User Guide

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4.2 Turning OFF the GE865

The turning off of the device can be done in three ways:

• by software command (see GE865 Software User Guide)

• by hardware shutdown

• by Hardware Unconditional Restart

When the device is shut down by software command or by hardware shutdown, it issues to the network a detach request that informs the network that the device will not be reachable any more.

4.2.1 Hardware shutdown

To turn OFF the GE865 the pad ON# must be tied low for at least 2 seconds and then released. The same circuitry and timing for the power on shall be used. The device shuts down after the release of the ON# pad.

TIP: To check if the device has powered off, the hardware line PWRMON should be monitored. When PWRMON goes

low, the device has powered off.

GE865 Hardware User Guide

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4.2.2 Hardware Unconditional Restart

To unconditionally Restart the GE865, the pad RESET# must be tied low for at least 200 milliseconds and then released. A simple circuit to do it is:

Unconditional Restart impulse

GND

The following flow chart shows the proper Reset procedure:

NOTE: don't use any pull up resistor on the RESET# line nor any totem pole digital output. Using pull up resistor may bring to latch up problems on the GE865 power regulator and improper functioning of the module. The line RESET# must be connected only in open collector configuration.

RESET#

GE865 Hardware User Guide

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NOTE: The unconditional hardware Restart should be always implemented on the boards and software should use it as an emergency exit procedure.

For example: 1- Let's assume you need to drive the RESET# pad with a totem pole output of a +3/5 V microcontroller (uP_OUT2):

10k

NOTE: The RESET# signal is internally pulled up so the pin can be left floating if not used

GE865 Hardware User Guide

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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 overall performances, hence read carefully the requirements and the guidelines that will 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 Normal Operating Voltage Range Extended Operating Voltage Range

NOTE: The Operating Voltage Range MUST never be exceeded; care must be taken in order to fulfill min/max voltage requirement

3.8 V

3.4 V - 4.2 V

3.22 V - 4.5 V

NOTE: 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.

GE865

QUAD

Mode

Average (

mA) Mode description

IDLE mode

RX mode

GSM TX and RX mode

GPRS (class 10) TX and RX mode

POWER OFF

GE865 Hardware User Guide

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5.2 Power Consumption

The GE865-QUAD power consumptions are: (Preliminary Values)

Stand by mode; no call in progress

AT+CFUN=1 23,9 Normal mode: full functionality of the module AT+CFUN=4 22

AT+CFUN=0 or

AT+CFUN=5

2,4

Disabled TX and RX; module is not registered on the

network

Power saving: CFUN=0 module registered on the network

and can receive voice call or an SMS; but it is not possible

to send AT commands; module wakes up with an

unsolicited code (call or SMS) or rising RTS line. CFUN=5

full functionality with power saving; module registered on

the network can receive incoming calls and SMS

1 slot in downlink 52,3 2 slot in downlink 65,2 3 slot in downlink 78,6 4 slot in downlink 88,4

Max power level 200,1

Max power level 370,8

Power Off <26uA

GSM Receiving data mode

GSM Sending data mode Min power level 78,1

GPRS Sending data mode Min power level 123,7

Module Powered Off

The GSM system is made in a way that the RF transmission is not continuous, else it is packed into bursts at a base frequency of about 216 Hz, and the relative current peaks can be as high as about 2A. Therefore the power supply has to be designed in order to withstand with these current peaks without big voltage drops; this means that both the electrical design and the board layout must be designed for this current flow. If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the supply; this will reflect on all the audio paths producing an audible annoying noise at 216 Hz; if the voltage drop during the peak current absorption is too much, then the device may even shutdown as a consequence of the supply voltage drop.

TIP: The electrical design for the Power supply should be made ensuring it will be capable of a peak current output of at least 2 A.

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Telit Communications S p A GE865 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual