Telit Wireless Solutions GL865 Hardware User's Manual

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GL865 Hardware User Guide

1vv0300910 Rev.1 – 2011-07-22

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Page 1 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22...
Page 2 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 APPLICABILITY TABLE PRODUCT GL865 QUAD GL865 DUAL Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 2 of 79...
Page 3 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 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 officers, employees,...
Page 4: Table Of Contents
ONVENTIONS 1.6..............................8 ELATED OCUMENTS 1.7..............................8 OCUMENT ISTORY OVERVIEW ................................10 GL865 MECHANICAL DIMENSIONS .......................... 12 GL865 MODULE CONNECTIONS ..........................13 4.1. PIN-OUT .................................. 13 4.2................................16 AYOUT HARDWARE COMMANDS ............................17 5.1. GL865 ........................... 17 URNING 5.2.
Page 5 ONVERTER 12.2.1. Description ..............................67 12.2.2. Using ADC Converter ............................. 67 12.3. GL865 ........................... 67 EBUG OF THE IN PRODUCTION MOUNTING THE GL865 ON YOUR BOARD ......................69 13.1..................................69 ENERAL 13.2. & ..........................69 ODULE FINISHING DIMENSIONS 13.3.
Page 6: Introduction
Introduction 1.1. Scope The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GL865 module. 1.2. Audience This document is intended for Telit customers, who are integrators, about to implement their applications using our GL865 modules.
Page 7: Text Conventions
Chapter 8: “Logic Level specifications” Specific values adopted in the implementation of logic levels for this module. Chapter 9: “Serial ports” The serial port on the Telit GL865 is the core of the interface between the module and OEM hardware Chapter 10: “Audio Section overview”...
Page 8: Related Documents
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Caution Warning – Alerts user 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.
Page 10: Overview
1vv0300910 Rev.1 – 2011-07-22 Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GL865 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.
Page 11 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 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.
Page 12: Gl865 Mechanical Dimensions
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 GL865 Mechanical Dimensions The GL865 overall dimensions are: • Length: 24.4 mm • Width: 24.4 mm • Thickness: 2.7 mm • Weight 2.48 g Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...
Page 13: Gl865 Module Connections
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 GL865 module connections 4.1. PIN-OUT Signal Function Note Type Audio EAR- Earphone signal output, phase - Audio EAR+ Earphone signal output, phase + Audio MIC- Mic.signal input; phase- Audio MIC+ Mic.signal input; phase+...
Page 14 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Signal Function Note Type Miscellaneous Functions VRTC VRTC Backup Power RESET* Reset input CMOS 1.8V 2.8V stabilized output Imax=100mA Power Out V_AUX / PWRMON / Power ON monitor 2.8V Antenna Antenna output – 50...
Page 15 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 NOTE: If not used, almost all pins should be left disconnected. The only exceptions are the following pins: signal 38, 37 VBATT & VBATT_PA 32, 33, 35, 36, 46 AGND V_AUX / PWRMON...
Page 16: Pin Layout
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 4.2. Pin Layout TOP VIEW NOTE: The pin defined as NC/RFU has to be considered RESERVED and don’t connect on any pin in the application. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...
Page 17: Hardware Commands
Hardware Commands 5.1. Auto-Turning ON the GL865 To Auto-turn on the GL865, the power supply must be applied on the power pins VBATT and VBATT_PA, after 1000 m-seconds, the pin will be at the high logic level and the module V_AUX / PWRMON can be consider fully operating.
Page 18 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 GL865 when the module is powered OFF or during an ON/OFF transition. A flow chart showing the AT command managing procedure is displayed below: Start AT CMD.
Page 19: Turning Off The Gl865
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 5.2. Turning OFF the GL865 Turning off of the device can be done in two ways: • General turn OFF • Processor turn OFF General turn OFF – disconnect the power supply from the both power pins VBATT and VBATT_PA at the same time.
Page 20 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 GL865 when the module is powered OFF or during an ON/OFF transition. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...
Page 21: Resetting The Gl865
SIM responses. To unconditionally reboot the GL865, the pad RESET* must be tied low for at least 200 milliseconds and then released.
Page 22 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 GL865 when the module is powered OFF or during an ON/OFF transition. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...
Page 23: Power Supply
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 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 requirements and the guidelines that will follow for a proper design.
Page 24: Power Consumption
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 6.2. Power Consumption The GL865 power consumptions are: GL 865 Average Mode Mode description (mA) SWITCHED OFF Module power supplied only on VBATT_PA pin, Switched Off <5uA the VBATT pin is not power supplied.
Page 25: General Design Rules
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks close to the GL865, 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.
Page 26 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 An example of linear regulator with 5V input is: 6.3.1.2. + 12V input Source Power Supply Design Guidelines The desired output for the power supply is 3.8V, hence due to the big difference between the input source and the desired output, a linear regulator is not suited and shall not be used.
Page 27 1vv0300910 Rev.1 – 2011-07-22 A protection diode should be inserted close to the power input, in order to save the GL865 from power polarity inversion. This can be the same diode as for spike protection. An example of switching regulator with 12V input is in the below schematic (split in 2 parts): 6.3.1.3.
Page 28 The three cells Ni/Cd or Ni/MH 3,6 V Nom. battery types or 4V PB types MUST NOT BE USED DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the GL865 and damage NOTE: DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GL865.
Page 29: Thermal Design Guidelines
For the heat generated by the GL865, you can consider it to be during transmission 1W max during CSD/VOICE calls and 2W max during class10 GPRS upload.
Page 30: Power Supply Pcb Layout Guidelines
The Bypass low ESR capacitor must be placed close to the Telit GL865 power input pads or in the case the power supply is a switching type it can be placed close to the inductor to cut the...
Page 31 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 The power supply input cables should be kept separate from noise sensitive lines such as microphone/earphone cables. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 31 of 79...
Page 32: Antenna
(pin 34) by means of a transmission line implemented on the PCB. In the case the antenna is not directly connected at the antenna pad of the GL865, then a PCB line is needed in order to connect with it or with its connector.
Page 33: Gsm Antenna - Pcb Line Guidelines
Keep the antenna line far away from the GL865 power supply lines; If EM noisy devices are present on the PCB hosting the GL865, such as fast switching ICs, take care of the shielding of the antenna line by burying it inside the layers of PCB and surround it with Ground planes, or shield it with a metal frame cover.
Page 34 In the case FCC certification is required for an application using GL865, according to FCC KDB 996369 for modular approval requirements, the transmission line has to be similar to that implemented on GL865 interface board and described in the following chapter.
Page 35 HP8753E VNA (Full-2-port calibration) has been used in this measurement session. A calibrated coaxial cable has been soldered at the pad corresponding to GL865 RF output; a SMA connector has been soldered to the board in order to characterize the losses of the transmission line including the connector itself.
Page 36 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Line input impedance (in Smith Chart format, once the line has been terminated to 50 load) is shown in the following figure: Insertion Loss of G-CPW line plus SMA connector is shown below: Reproduction forbidden without Telit Communications S.p.A.
Page 37: Gsm Antenna - Installation Guidelines
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 7.4. GSM Antenna - Installation Guidelines Install the antenna in a place covered by the GSM signal. Antenna shall not be installed inside metal cases Antenna shall be installed also according Antenna manufacturer instructions.
Page 38: Logic Level Specifications
Logic level specifications Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels. The following table shows the logic level specifications used in the GL865 interface circuits: Absolute Maximum Ratings -Not Functional Parameter Input level on any digital -0.3V +3.1V...
Page 39: Reset Signal
Reset signal Signal Function RESET* Phone reset I RESET* is used to reset the GL865. Whenever this signal is pulled low, the GL865 is reset. When the device is reset it stops any operation. After release reset GL865 unconditionally shut down, without doing any detach operation from the network where it is registered.
Page 41: Serial Ports
The only configuration that doesn't need a level translation is the 2.8V UART. The serial port on the GL865 is a +2.8V UART with all the 7 RS232 signals.
Page 42 NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on the GL865 side these signal are on the opposite direction: TXD on the application side will be connected to the receive line (here named TXD/ rx_uart ) of the GL865 serial port and viceversa for RX.
Page 43: Rs232 Level Translation
GE865 when the module is powered off or during an ON/OFF transition. 9.2. RS232 level translation In order to interface the GL865 with a PC com port or a RS232 (EIA/TIA-232) application a level translator is required. This level translator must: •...
Page 45 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 An example of level translation circuitry of this kind is: The example is done with a MAXIM MAX3237 Transceiver that could accept supply voltages of 3V DC. Not exceeded with supply voltage higher then 3.1VDC because this is the higher voltage limit of...
Page 46 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Second solution could be done using a MAXIM transceiver (MAX218) In this case the compliance with RS232 (+-5V) is possible. Another level adapting method could be done using a standard RS232 Transceiver (MAX3237EAI) adding some resistors to adapt the levels on the GL865 Input lines.
Page 47: Uart Level Translation
Note that the TC7SZ07AE has open drain output; therefore the resistor R2 is mandatory. NOTE: The UART input line TXD (rx_uart) of the GL865 is NOT internally pulled up with a resistor, so there may be the need to place an...
Page 48 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 GL865 when the module is powered OFF or during an ON/OFF transition. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...
Page 49: Audio Section Overview
1vv0300910 Rev.1 – 2011-07-22 Audio Section Overview The Base Band Chip of the GL865 provides one input for audio to be transmitted (Uplink), that can be connected directly to a microphone or an audio source. The bias for the microphone is already provided by the product; so the connection can...
Page 50 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 capacitor (usually a 33pF or a 10pF capacitor placed across the output terminals inside the case). LINE-IN connection Vmic 220n MIC/AF_IN+ INPUT 220n MIC/AF_IN- AF_IN+ AF_IN- AGND MODULE Vmic 220n MIC/AF_IN+ INPUT...
Page 51 1vv0300910 Rev.1 – 2011-07-22 EAR connection connection EAR+ OUTPUT EAR- MODULE The audio output of the GL865 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 drive...
Page 52: Electrical Characteristics
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 10.1. Electrical Characteristics 10.1.1. Input Lines Microphone/Line-in path Line Type Differential ≥ 1µF Coupling capacitor Differential input 1k /2k /2.2k resistance Levels To have 0dBm0 @1KHz Differential input voltage AT#HFMICG=0 290mVrms AT#HFMICG=1...
Page 53: Output Lines
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 10.1.2. Output Lines EAR/Line-out Output Differential line Direct connection coupling =1.3÷1.6V) One EAR terminal Single-ended line connected via a DC-block coupling capacitor, the other one left open output load resistance ≥ 8 internal output (typ.)
Page 55: General Purpose I/O
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 GL865 firmware and acts depending on the function implemented. For Logic levels please refer to chapter 8.
Page 56: Gpio Logic Levels
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Also the UART ‘s control flow pins can be ubable as GPI/O. Pin Signal I/O Function Type Input / Default ON_OFF State Note output State state during current Reset Alternate Configurable CMOS...
Page 57: Using Agpio Pad As Input
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 GL865 when the module is powered OFF or during an ON/OFF transition. TIP: The V_AUX / PWRMON pin can be used for input pull up reference or/and for ON/OFF monitoring.
Page 58: Using The Alarm Output Gpio6
11.5. Using the Alarm Output GPIO6 The GPIO6 pad, when configured as Alarm Output, is controlled by the GL865 module and will rise when the alarm starts and fall after the issue of a dedicated AT command. This output...
Page 59: Magnetic Buzzer Concepts
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 +V buzzer SMBT2907A 4,7K D1N4148 33pF GPIO7 BCR141W NOTE: To correctly drive a buzzer a driver must be provided, its characteristics depend on the Buzzer and for them refer to your buzzer vendor.
Page 60: Frequency Behaviour
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Drawing of the Magnetic Buzzer. The disk and diaphragm are attracted to the core by the magnetic field. When an oscillating signal is moved through the coil, it produces fluctuating magnetic field...
Page 61: Working Current Influence
11.8. STAT LED Indication of network service availability The STAT_LED pin status shows information on the network service availability and Call status. In the GL865 modules, the STAT_LED usually needs an external transistor to drive an external LED. Therefore, status...
Page 62: Simin Detection
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 LED status Device Status Permanently off Device off Fast blinking Net search / Not (Period 1s, Ton registered / turning 0,5s) Slow blinking Registered full (Period 3s, Ton service 0,3s) Permanently on...
Page 63 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 supported range is from 1 to 8 (see chapter 11) AT#SIMINCFG? Read command reports the selected I/O pin in the format: #SIMINCFG: 1 AT#SIMINCFG =? Test command reports supported range of values for parameters in the format: #SIMINCFG : (0 –...
Page 64: Rtc Bypass Out
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 11.10. RTC Bypass out The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital part, allowing having only RTC going on when all the other parts of the device are off.
Page 65: Dac And Adc Section
12.1. DAC Converter 12.1.1. Description The GL865 provides a Digital to Analog Converter. The signal (named DAC_OUT) is available on pin 15 of the GL865. The on board DAC is a 10 bit converter, able to generate a analogue value based a specific input in the range from 0 up to 1023.
Page 66: Enabling Dac
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 12.1.2. Enabling DAC AT command is available to use the DAC function. The command is: AT#DAC= [<enable> [, <value>]] <value> - scale factor of the integrated output voltage (0..1023 - 10 bit precision) it must be present if <enable>=1...
Page 67: Adc Converter
Input Voltage Volt range AD conversion bits Resolution < 1 The GL865 module provides 2 Analog to Digital Converters. The input lines are: ADC_IN1 available on pin 13 ADC_IN2 available on pin 14 12.2.2. Using ADC Converter AT command is available to use the ADC function.
Page 68 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 test debug mounting GL865, strongly recommend to foreseen test pads on the host PCB, in order to check connection between GL865 itself application and to test the performance of the module connecting...
Page 69: Mounting The Gl865 On Your Board
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Mounting the GL865 on your Board 13.1. General The GL865 modules have been designed in order to be compliant with a standard lead-free SMT process. 13.2. Module finishing & dimensions Bottom View...
Page 70: Recommended Foot Print For The Application
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 13.3. Recommended foot print for the application Top View In order to easily rework the GE865 is suggested to consider on the application a 1.5 mm placement inhibit area around the module.
Page 71: Solder Paste
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 13.4. Solder paste Lead free Solder Sn/Ag/Cu paste We recommend to use only “no clean” solder paste in order to avoid the cleaning of the modules after assembly 13.4.1. GL865 Solder reflow The following is the recommended solder reflow profile Reproduction forbidden without Telit Communications S.p.A.
Page 72 NOTE: All temperatures refer to topside of the package, measured on the package body surface WARNING: The GL865 module withstands one reflow process only. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 72 of 79...
Page 73: Packing System
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Packing system The GL865 modules are packaged on trays of 20 pieces each. This is especially suitable for the GL865 according to SMT processes for pick & place movement requirements. NOTE: All temperatures refer to topside of the package, measured on...
Page 74: Moisture Sensibility
1vv0300910 Rev.1 – 2011-07-22 14.1. Moisture sensibility The level of moisture sensibility of GL865 is “3”, in according with standard IPC/JEDEC J-STD-020, take care all the relatives requirements for using this kind of components. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...
Page 75: Conformity Assessment Issues
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 Conformity Assessment Issues The Telit GL865 Module has been assessed in order to satisfy the essential requirements of the R&TTE Directive 1999/05/EC (Radio Equipment & Telecommunications Terminal Equipments) to demonstrate the conformity against the harmonised standards with the final involvement of a Notified Body.
Page 76: Safety Recommandations
GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 SAFETY RECOMMANDATIONS READ CAREFULLY Be sure the use of this product is allowed in the country and in environment required. this product dangerous and has to be avoided in the following areas:...
Page 77 GL865 Hardware User Guide 1vv0300910 Rev.1 – 2011-07-22 European Community provides some Directives electronic equipments introduced on the market. All the relevant information’s are available on the European Community website: http://ec.europa.eu/enterprise/sectors/rtte/documents/ text Directive 99/05 regarding telecommunication equipments is available, while the applicable Directives (Low Voltage and EMC) are available at: http://ec.europa.eu/enterprise/sectors/electrical...
Page 78 équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. The GL865-QUAD has been designed to comply with safety requirements for exposure to radio waves (SAR) in accordance with RSS-102. Please follow the instructions included in the user guide for product installation and use.
Page 79 Antenna types having a gain greater than the maximum gain indicated are strictly prohibited for use with this device. Le GL865-QUAD a été conçu pour se conformer aux exigences de sécurité pour l'exposition aux ondes radio (SAR) en conformité avec RSS-102. S'il vous plaît suivez les instructions incluses dans le guide utilisateur pour l'installation du produit et son utilisation.

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Gl865 quad

Telit Wireless Solutions GL865 Hardware User's Manual

1 Introduction

2 Overview

3 Gl865 Mechanical Dimensions

4 Gl865 Module Connections

5 Hardware Commands

6 Power Supply

7 Antenna

8 Logic Level Specifications

9 Serial Ports

10 Audio Section Overview

11 General Purpose I/O

12 Dac and Adc Section

13 Mounting the Gl865 on Your Board

14 Packing System

15 Conformity Assessment Issues

16 Safety Recommandations

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