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GE865 Hardware User Guide

1. 4 E f A g 1 a p ff e Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 16 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 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 amp VBATT_PA signals and must fulfill the following requirements POWER SUPPLY Nominal Supply Voltage 3 8 V Normal Operating Voltage Range 3 4 V 4 2 V Extended Operating Voltage Range 3 22 V 4 5 V NOTE The Operating Voltage Range MUST never be exceeded care must be taken in order to fulfill min max voltage requirement 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 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 17 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 5 2 Power Consumption The GE865 QUAD
2. E7 GND Ground Power G5 GND Ground Power G4 GND Ground Power G3 GND Ground Power H GND Ground Power H6 GND Ground Power RESERVED B6 C3 CA C5 C6 D5 D6 D7 E6 F7 F8 page 8 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 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 pin signal F1 F2 F3 VBATT amp VBATT PA G1 C2 C7 E5 E7 G5 G4 GND G3 H3 H6 B1 ON OFF A3 TXD C1 RESET A4 RXD A1 RTS D1 TXD_AUX E1 RXD_AUX H1 Service RTS should be connected to the GND on the module side if flow control is not used Cer forbidden without Telit Communications S p A written authorization All Rights Reserved page 9 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 3 1 1 BGA Balls Layout TOP VIEW SIMCLK SIMVCC SIMRST LEGENDA POWER SUPPLY GND RESERVED 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 g no oe re Rights Reserved l page 10 of 58 SS E 2 7 e i Reproduction forbidden without Telit Communications S p A written authorization Al d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09
3. 0V therefore the level translator IC shall not be powered by the 3 8V supply of the module Instead it must be powered from a 2 7V 2 9V dedicated power supply This is because in this way the level translator IC outputs on the module side i e GE865 inputs will work at 3 8V interface levels damaging the module inputs 158 od ET forbidden without Telit Communications S p A written authorization All Rights Reserved page 32 of 58 Ee o Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 An example of level translation circuitry of this kind is Vin C57p0 1uF L 281 E CDI 0 1 uF L 02 0 1uF RS232 Outputs from Module RS232 Outputs RS232 Inputs to Module f RS232 Inputs Vin IA The example is done with a SIPEX SP3282EB RS232 Transceiver that could accept supply voltages lower than 3V DC In this case Vin has to be set with a value compatible with the logic levels of the module Max 2 9V DC In this configuration the SP3282EB will adhere to EIA TIA 562 voltage levels instead of RS232 5 5V o sh ds d Ka ZE 4 f 2 547 d i d P E E D mr i ET _ S Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 33 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 Second solution could be done using a MAXIM transceiver MAX218 In this
4. 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 Power ON impulse Ge w 77 DND NOTE don t use any pull up resistor on the ONS 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 it or with a bar over the name raised up the device could be considered powered on 9 TIP To check if the device has powered on the hardware line PWRMON should be monitored After 900ms the line 7 o Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 A flow chart showing the proper turn on procedure is displayed below Start AT CMD PWRMON ON or 2s timeout Delay 1s Start AT CMD n without Telit Communications S p A written authorization All Rights Reserved page 12 of 58 d i E iu i Lid I Reproduction forbidde d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 For example 1 Let s assume you need to drive the ON pad with a totem pole output of a 3
5. 5 V microcontroller uP_OUT1 ON Q2 uP QUT41 S E BCB47BW S0T 323 Fs 3 6 Wesweses Oven LL Is Power ON OFF ingulse 2 Let s assume you need to drive the ON pad directly with an ON OFF button OND oom d page 13 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 4 2 Turning OFF the GE865 The turning off of the device can be done in three ways e by software command see GE865 Software User Guide e by hardware shutdown e 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 ON OFF LOW Delay 2s PWRMON OFF or 15s timeout ro fb 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 wee e E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 14 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 4 2 2 Hardware Unconditional Restart To unconditi
6. Whenever this signal is pulled low the GE865 is reset When the device is reset it stops any operation After the release of the reset GE865 is unconditionally shut down without doing any detach operation from the network where it is registered This behaviour is not a proper shut down because any GSM device is requested to issue a detach request on turn off For this reason the Reset signal must not be used to normally shutting down the device but only as an emergency exit in the rare case the device remains stuck waiting for some network response The RESET is internally controlled on start up to achieve always a proper power on reset sequence so there s no need to control this pin on start up It may only be used to reset a device already on that is not responding to any command NOTE do not use this signal to power off the GE865 Use the ON OFF signal to perform this function or the ATZSHDN command Reset Signal Operating levels Signal Min Max RESET Inputhigh 1 8V 2 1V RESET Input low OV 0 2V this signal is internally pulled up so the pin can be left floating if not used If unused this signal may be left unconnected If used then it must always be connected with an open collector transistor to permit to the internal circuitry the power on reset and under voltage lockout functions Y i AB Ng Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 29
7. assume that the device stays into transmission for short periods of time let s say few minutes and then remains for a quite long time in idle let s say one hour then the power supply has always the time to cool down between the calls and the heat sink could be smaller than the calculated one for 500mA maximum RMS current or even could be the simple chip package no heat sink Moreover in the 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 the 500mA being usually around 150mA 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 For the heat generated by the GE865 you can consider it to be during transmission 1W max during CSD VOICE calls and 2W max during class10 GPRS upload This generated heat will be mostly conducted to the ground plane under the GE865 you must ensure that your application can dissipate it n without Telit Communications S p A written authorization All Rights Reserved page 23 of 58 Reproduction forbidde Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 5 3 3 Power Supply PCB layout Guidelines As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the output to cut the current peaks and a protec
8. e JDR GPIO 03 I O GPIO03 Configurable GPIO CMOS2 8V 1uA mA INPUT 0 0 Alternate function GPIO_04 VO GPIO04 Configurable GPIO CMOS 2 8V 1uA 1mA INPUT 0 0 RF Transmission Control Alternate function GPIO_05 lO GPIOO05 Configurable GPIO CMOS 2 8V 1uA imA INPUT 0 0 RETXMON GPIO_06 I O GPIO06 Configurable GPIO CMOS2 8V 1uA MmA INPUT 0 0 EE ARE GPIO_07 I O GPIOO7 Configurable GPIO CMOS2 8V 1uA imA INPUT 0 0 e GPIO_08 I O GPIO08 Configurable GPIO CMOS2 8V 1uA imA INPUT 0 0 GPIO_09 I O GPIO09 Configurable GPIO CMOS 2 8V 1 1 1 Open Drain GPIO 10 I O GPIO10 Configurable GPIO CMOS 2 8V 1 1 1 Open Drain Not all GPIO pads support all these three modes e GPIO2 supports all three modes and can be input output Jamming Detect Output Alternate function e GPIO4 supports all three modes and can be input output RF Transmission Control Alternate function e GPIOS supports all three modes and can be input output RFTX monitor output Alternate function e GPIO6 supports all three modes and can be input output alarm output Alternate function e GPIO7 supports all three modes and can be input output buzzer output Alternate function page 39 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 11 1 GPIO Logic levels 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 GE865 interface circuits Absol
9. made against the Essential requirements of the R amp TTE Directive Articles 3 1 a and b safety and EMC respectively and any relevant Article 3 3 requirements The GE865 QUAD module is conforming with the following European Union Directives e R amp TTE Directive 1999 5 EC Radio Equipment amp Telecommunications Terminal Equipments e Low Voltage Directive 73 23 EEC and product safety e Directive 89 336 EEC for conformity for EMC In order to satisfy the essential requisite of the R amp TTE 99 5 EC directive the GE865 QUAD module is compliant with the following standards e GSM Radio Spectrum Standard EN 301 511 and 3GPP 51 010 1 e EMC Electromagnetic Compatibility Standards EN 301 489 1 and EN 301 489 7 LVD Low Voltage Directive Standards EN 60 950 In this document and the Hardware User Guide Software User Guide all the information you may need for developing a product meeting the R amp TTE Directive is included The GE865 QUAD module is conforming with the following US Directives e Use of RF Spectrum Standards FCC 47 Part 24 GSM 1900 e EMC Electromagnetic Compatibility Standards FCC47 Part 15 To meet the FCC s RF exposure rules and regulations 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 The system antenna s used for this
10. module must not exceed 3 dBi for mobile and fixed or mobile operating configurations 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 Cer forbidden without Telit Communications S p A written authorization All Rights Reserved page 56 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 14 SAFETY RECOMMANDATIONS 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 C Where it can interfere with other electronic devices in environments such as hospitals airports aircrafts etc C Where there is risk of explosion such as gasoline stations oil refineries etc It is responsibility of the user to enforce the country regulation and the specific environment regulation Do not disassemble the product any mark of tampering will compromise the warranty validity We recommend following 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 be conforming to the s
11. needs 10 2 Output Lines Characteristics Ear Differential Line out Drivers Path e line coupling DC e line type bridged e output load resistance 2140 e internal output resistance 4 Q typical e signal bandwidth 150 4000 Hz 3 dB e max differential output voltage 1310 MV ims typ open circuit e differential output voltage 328mVrms 16 O 12dBFS e SW volume level step 2dB e number of SW volume steps 10 For more detailed information about audio please refer to the Audio Settings Application Note 80000NT10007a wee 3 D Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 38 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 11 General Purpose I O The general purpose I O pads can be configured to act in three different ways e input e output e alternate function internally controlled Input pads can only be read and 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 GE865 firmware and acts depending on the function implemented For Logic levels please refer to chapter 7 The following GPIO are available on the GE865 QUAD GPIO 01 I O GPIOO1 Configurable GPIO CMOS 2 8V 1uA imA INPUT 0 0 GPIO 02 I O GPIO02 Configurable GPIO CMOS2 8V 1uA imA INPUT 0 0 lu
12. power consumptions are Preliminary Values GE865 QUAD Mode Average mA Mode description IDLE mode Stand by mode no call in progress AT CFUN 1 23 9 Normal mode full functionality of the module Disabled TX and RX module is not registered on the AT CFUN 4 22 network Power saving CFUN 0 module registered on the network and can receive voice call or an SMS but it is not possible AT CFUN 0 or to send AT commands module wakes up with an AT CFUN 5 eg 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 RX mode 1 slot in downlink 52 3 2 slot in downlink 65 2 GSM Receiving data mode 3 slot in downlink 78 6 4 slot in downlink 88 4 GSM TX and RX mode Min power level 78 1 GSM Sending data mode Max power level 200 1 GPRS class 10 TX and RX mode Min power level 123 7 GPRS Sending data mode Max power level 370 8 Power Off ROWER CGE 26uA 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
13. same of the recommended footprint 1 1 we suggest a thickness of stencil foil 2 120m wireless solutions GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 12 3 6 PCB pad design Non solder mask defined NSMD type is recommended for the solder pads on the PCB Recommendations for PCB pad dimensions Ball pitch mm 2 4 Solder resist opening diameter A mm 1 150 Metal pad diameter B mm 1 0 05 Placement of microvias not covered by solder resist is not recommended inside the Solder resist opening unless the microvia carry the same signal of the pad itself Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 51 of 58 wireless solutions GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 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 3 7 good solder ability protection high Immersion Au 0 05 0 15 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 12 3 7 Solder paste Lead free Solder paste Sn Ag Cu K sse forbidden without Telit Co
14. 04 09 12 DAC and ADC section 12 1 DAC Converter 12 1 1 Description The GE865 module provides a Digital to Analog Converter The signal named DAC OUT is available on BGA Ball G7 of the GE865 module and on pin 17 of PL102 on EVK2 Board CS1324 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 However an external low pass filter is necessary Min Max Units Voltage range filtered 0 2 6 Volt Range 0 1023 Steps The precision is 10 bits so if we consider that the maximum voltage is 2V the integrated voltage could be calculated with the following formula Integrated output voltage 2 value 1023 DAC OUT line must be integrated for example with a low band pass filter in order to obtain an analog voltage Lem Cer forbidden without Telit Communications S p A written authorization All Rights h page 45 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 12 1 2 Enabling DAC An AT command is available to use the DAC function The command is AT DAC lt enable gt lt value gt value scale factor of the integrated output voltage 0 1023 10 bit precision it must be present if lt enable gt 1 Refer to SW User Guide or AT Commands Reference Guide for the full description of this function NOTE The DAC frequency is selected internally D A converter must not be used during POWERSAVI
15. 65 during sleep periods dramatically reducing the sleep consumption to few pA In battery powered devices this feature will greatly improve the autonomy of the device 11 7 Using the Buzzer Output GPIO7 The GPIO7 pad when configured as Buzzer Output is controlled by the GE865 module and will drive with appropriate square waves a Buzzer driver This permits to your application to easily implement Buzzer feature with ringing tones or melody played at the call incoming tone playing on SMS incoming or simply playing a tone or melody when needed by your application A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the GPIO7 vk Q102 e EE BZ101 E M Hm AUN SOT 23 SMUS 1 227 ei i SMBT290 7A 3 3 y 2 D101 EE di Q101 MCL4 148 cos GFIOT 2 ZE ECRI4IW A soy SOT 323 Wis dnb Joh 1 E 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 Y SE AH Lr Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 42 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 11 8 Indication of network service availability The STAT LED pin status shows information on the network service availab
16. Ball Signal yo Function Note Type Audio E8 EAR AO Earphone signal output phase Audio D8 EAR AO Earphone signal output phase Audio B8 MIC Al Mic signal input phase Audio C8 MIC Al Mic signal input phase Audio SIM card interface A5 SIMCLK O External SIM signal Clock 1 8 3V A8 SIMRST O External SIM signal Reset 1 8 3V A6 SIMIO l O External SIM signal Data I O 4 7K Pull up 1 8 3V B7 SIMIN External SIM signal Presence active low 1 8 3V A7 SIMVCC External SIM signal Power supply for the SIM 1 8 3V Trace D1 TXD_AUX O Auxiliary UART TX Data CMOS 2 8V E1 RXD_AUX l Auxiliary UART RX Data CMOS 2 8V Prog Data HW Flow Control A3 C103 TXD Serial data input TXD from DTE CMOS 2 8V A4 C104 RXD O Serial data output to DTE CMOS 2 8V B3 C108 DTR DLE for Data terminal ready signal DTR from CMOS 2 8V M C105 RTS mei for Request to send signal RTS from CMOS 2 8V A2 C106 CTS O Output for Clear to send signal CTS to DTE CMOS 2 8V B5 C109 DCD o Aa for Data carrier detect signal DCD to CMOS 2 8V B2 C107 DSR O Output for Data set ready signal DSR to DTE CMOS 2 8V B4 C125 RING O Output for Ring indicator signal RI to DTE CMOS 2 8V DAC and ADC G7 DAC_OUT AO Digital Analog converter output D A F5 ADC_IN1 Al Analog Digital converter input A D F6 ADC_IN2 Al Analog Digital converter input A D Miscellaneous Functions C1 RESET l Reset input H2 VRTC AO VRTC Backup capacitor Power G8 STAT LED O Status indicat
17. HL e i lel wireless solutions GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 Making machines talk Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 Contents UNE o uS fe Aaaa 5 2 GE865 Mechanical Dimensions ecce eee eee esee ecce esee eere 6 3 GE865 module connections ems 7 St PINSOUT ee 7 3 1 1 BGA Balls Layout t 10 4 Hardware Commas Leon penA en nIRASARERARARSRRRARARARRRARARARRRARRSARRRARARAR RR ERAN ER RR ERAS SR RR ERAS En RSRAREN 11 41 Turning ON the Gy as cc enar Eee D eI ed esten ouem ie ice ein E e EE 11 42 Tuming OFF the GE8DD iine poesie nice on Roin ennECn cepa RR ce ee 14 4 2 1 Hardware sh tdoWrn ET 14 4 2 2 Hardware Unconditional Hestart essere nennen nemen sn nnne nnns 15 5 Power S ppiy Uode abc cad dd OCDE M MN CHR Glo d CA UE 17 5 1 Power Supply Requirements xis sciatica essecn ce e etr kn nnt ratto ntu S nur oua shee cepa cect enced 17 5 2 Power Consumpllon eu rato tose thua ko noh RE cuu ERR x Ru RE n nux cece nace FEE EERNMRERAR RN E n eee EEKERR KR K MEA 18 5 3 General Design Rules oie eee 19 5 3 1 Electrical Design Guidelines AA 19 5 8 1 1 tc 5V input Source Power Supply Design Guidelines esseesseesseesseessrtssressnnssrresnnernssennsennne 19 5 3 1 2 12V input Source Power Supply Design Guidelines esseesseesseesseesesssesrnrnssrsennnrns
18. Hz 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 e n 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 e For car PB battery the input voltage can rise up to 15 8V and this should be kept in mind when choosing components all components in the power supply must withstand this voltage e A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks a 100pF tantalum capacitor is usually suited e Make sure the low ESR capacitor on the power supply output usually a tantalum one is rated at least 10V e For Car applications a spike protection diode should be inserted close to the power input in order to clean the supply from spikes e A protection diode should be inserted close to the power input in order to save the GE865 QUAD PY from power polarity inversion This can be the same diode as for spike protection KR gilt E ut n without Telit Communications S p A written authorization All Rights Reserved page 20 of 58 Reproduction forbidde Ee o Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 An example of switching regulator with 12V input is in the below schematic it is spli
19. NG 12 1 3 Low Pass Filter Example R1 R2 R3 DAC OUT AAA AAA AAA 12k 12k 12k INPUT dac out OUTPUT C1 100nF C2 100nF C3 100nF GND S 8 GND GND Ven GND GND 3 E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved i page 46 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 12 2 ADC Converter 12 2 1 Description The on board A D are 11 bit converter They are able to read a voltage level in the range of 0 2 volts applied on the ADC pin input store and convert it into 11 bit word Min Max Units Input Voltage range 0 2 Volt AD conversion 11 bits Resolution 1 mV The GE865 QUAD module provides 2 Analog to Digital Converters The input lines are ADC_IN1 available on Ball F5 and Pin 19 of PL102 on EVK2 Board CS1324 ADC IN available on Ball F6 and Pin 20 of PL102 on EVK2 Board CS1324 12 2 2 Using ADC Converter An AT command is available to use the ADC function The command is ATZADCz1 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 DV EET forbidden without Telit Communications S p A written authorization All Rights h page 47 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 12 3 Mounting the GE865 on your Board 12 3 1 General The Telit GE865 module
20. Output Lines Characteristics icici cas rna nix n ak ri teens ama eua o ri S ana ano REO n E FR sx Enna aen E EaR PRI EE 38 11 General Purpose E 39 11 1 GPIO Logic levels Mw m M 40 11 2 Usi g a GPIO Pad as NEE ee 41 11 3 Using a GPIO Pad as OUTPUT sicssissccncsccsecsescesccessestecsnecsiacennenseceesdveccencantidewedsdecesnanenceweesneie 41 11 4 Using the RF Transmission Control GPIOA ceeeeeeeeeeeeeeneneenee nnns 41 11 5 Using the RFTXMON Output GPIOS 1eeeeeeeeeeeeeeeeeeeeeeee enne en nnnnnnnn nnns 41 11 6 Using the Alarm Output GPIOG eeeeeeeeeeeeeeeeeeeeeeeee nennen nnn nennen nnn nnn nnns 42 11 7 Using the Buzzer Output eege 42 11 8 Indication of network service availability ccce 43 11 9 RTO Bypass qol er 44 11 10 External SIM Holder Implementation nnnssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnna 44 12 DAC and El e E 45 12 1 DAG C NvVertet ec 45 12 1 1 RE le e RE 45 1242 Enabling RTE 46 124 83 sbow Pass Filter E e 46 12 2 ADC Convert e 47 12 2 1 Description Ve TE T 12 2 2 Using ADC Converter TE e 12 3 Mounting the GE865 on your Board eeeeeeeeeeseeeseeeeeee nennen nennen nennen nnns 48 2o GSMO EE 48 12 3 2 Module finishing amp dimensions essersi E 48 12 3 9 Sugge
21. a proper design 6 1 GSM Antenna Requirements As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE865 device shall fulfill the following requirements ANTENNA REQUIREMENTS Frequency range Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s Bandwidth 70 MHz in GSM850 80 MHz in GSM900 170 MHz in DCS amp 140 MHz PCS band Gain Gain lt 3dBi Impedance 50 ohm Input power gt 2 W peak power VSWR absolute lt 10 1 max VSWR lt T recommended When using the Telit GE865 since there s no antenna connector on the module the antenna must be connected to the GE865 through the PCB with the antenna pad BGA Ball H5 In the case that the antenna is not directly developed on the same PCB hence directly connected at the antenna pad of the GE865 then a PCB line is needed in order to connect with it or with its connector n Ab wee D Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 25 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 This line of transmission shall fulfill the following requirements ANTENNA LINE ON PCB REQUIREMENTS Impedance 50 ohm Max Attenuation 0 3 dB No coupling with other signals allowed Cold End Ground Plane of antenna shall be equipotential to the GE865 ground pins Further
22. be more forgiving The PCB traces to the GE865 and the Bypass capacitor must be wide enough to ensure no significant voltage drops occur when the 2A current peaks are absorbed This is for the same reason as previous point 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 100 500 kHz usually The use of a good common ground plane is suggested The placement of the power supply on the board should be done in such a way to guarantee that the high current return paths in the ground plane are not overlapped to any noise sensitive circuitry as the microphone amplifier buffer or earphone amplifier The power supply input cables should be kept separate from noise sensitive lines such as microphone earphone cables EET forbidden without Telit Communications S p A written authorization All Rights Reserved page 24 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 6 Antenna The antenna connection and board layout design are the most important part in the full product design and they strongly reflect on the product overall performances hence read carefully and follow the requirements and the guidelines for
23. case the compliance with RS232 5V is possible M SS 2 8V SS ON OFF MODULE RS232 MODULE RS232 ENABLE Another level adapting method could be done using a standard RS232 Transceiver MAX3237EAI adding some resistors to adapt the levels on the GE865 Input lines NOTE In this case has to be taken in account the length of the lines on the application to avoid problems in case of High speed rates on RS232 The RS232 serial port lines are usually connected to a DB9 connector with the following layout DCD RS232 a we DSR RS232 gt d C RX RS232 C no RTS RS232 7 TX_A Lu CTS RS232 5 DTR RS23e2 4 RI RS238e li re e e f 1 1 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 34 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 8 3 5V UART level translation If the OEM application uses a microcontroller with a serial port UART that works at a voltage different from 2 8 3V then a circuitry has to be provided to adapt the different levels of the two set of signals As for the RS232 translation there are a multitude of single chip translators For example a possible translator circuit for a 5V TRANSMITTER RECEIVER can be TC7TWZS34FK TxD 5Vv T40 2 Bv 2 BV TO TELIT TO OEN HABDWABE Tex MODULE Hat DV AxD_2 AY TE 7SZ 07AFE GMO TIP Note that t
24. d 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 GE865 QUAD cellular module within user application shall be done according to the design rules described in this manual IT L integrazione del modulo cellulare GSM GPRS GE865 QUAD all interno dell applicazione dell utente dovr rispettare le indicazioni progettuali descritte in questo manuale DE Die integration des GE865 QUAD GSM GPRS Mobilfunk Moduls in ein Ger t muB gem der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen SL Integracija GSM GPRS GE865 QUAD modula v uporabni ki aplikaciji bo morala upo tevati projektna navodila opisana v tem pirocniku SP La utilizaci n del modulo GSM GPRS GE865 QUAD debe ser conforme a los usos para los cuales ha sido desenado descritos en este manual del usuario FR L int gration du module cellulaire GSM GPRS GE865 QUAD dans l application de l utilisateur sera faite selon les r gles de conception d crites dans ce manuel HE toe
25. e Directive 99 05 regarding telecommunication equipments is available while the gt 2 4 nics CR n without Telit Communications S p A written authorization All Rights Reserved page 57 of 58 Reproduction forbidde d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 15 Document Change Log Revision Date Changes ISSUE 0 26 01 2009 First ISSUE 0 DRAFT ISSUE 1 05 02 2009 Updated current consumptions table ISSUE 2 15 02 2009 Updated Pinout description ISSUE 3 18 03 2009 Updated mechanical dimensions balls spacing charger description removed Added better explanation of pin H5 RF and H1 service ISSUE 4 02 04 2009 Updated VBATT supply Range DAC schematic Conformity assessment m Cer forbidden without Telit Communications S p A written authorization All Rights d page 58 of 58
26. ecurity and fire prevention regulations The product has to be handled with care avoiding any contact with the pins because electrostatic discharges may damage the product itself Same cautions have to be taken for the SIM checking carefully the instruction for its use Do not insert or remove the SIM when the product is in power saving mode The system integrator is responsible of the functioning of the final product therefore care has to be taken to the external components of the module as well as of any project or installation issue because the risk of disturbing the GSM network or external devices or having impact on the 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 of this requirement cannot be satisfied the system integrator has to assess the final product against the SAR regulation The European Community provides some Directives for the electronic equipments introduced on the market All the relevant information s are available on the European Community website http europa eu int comm enterprise rtte dir99 5 htm http europa eu int comm enterprise electr_equipment index_en htm The text of th
27. erein 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 All rights reserved 2009 Telit Communications S p A is Cond Cer forbidden without Telit Communications S p A written authorization All Rights Reserved page 4 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 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 designe
28. he TC7SZ07AE has open drain output therefore the resistor R2 is mandatory Le m e Cer forbidden without Telit Communications S p A written authorization All Rights Reserved page 35 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 NOTE The UART input line TXD rx uart of the GE865 is NOT internally pulled up with a resistor so there may be the need to place an external 47KQ pull up resistor either the DTR dtr uart and RTS rts uart input lines are not pulled up internally so an external pull up resistor of 47KQ may be required NOTE The input lines working at 2 8VCMOS can be pulled up with 47KQ In case of reprogramming of the module has to be considered the use of the RESET line to start correctly the activity The preferable configuration is having an external supply for the buffer TU dU EE S d y M Eun Y LIAE ZU Se j i 5 e fi 4 a i E e ET E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 36 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 9 Audio Section Overview The Base Band Chip of the GE865 Telit Module provides one audio Line usable in transmit Uplink and in receive Downlink direction 9 1 Microphone Paths Characteristic and Requirements n TIP being the microphone circuitry the more noise sensitive its design and layout mu
29. ility and Call status In the GE865 modules the STAT LED usually needs an external transistor to drive an external LED Therefore 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 Net search Not registered Period 1s Ton 0 5s turning off Slow blinking Registered full service Period 3s Ton 0 3s Permanently on a call is active VBAIT R101 330 5 0603 LY M676 Q251 26 DL101 M676 T N 10K ki lt STAT LED a 1 a 4 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 43 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 11 9 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 To this power output a backup capacitor can be added in order to increase the RTC autonomy during power off of the battery NO Devices must be powered from this pin 11 10 External SIM Holder Implementation Please refer to the related User Guide SIM Holder Design Guides 80000NT 100013 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 44 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02
30. mmunications S p A written authorization All Rights Goergen page 52 of 58 12 3 8 GE865 Solder reflow d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 The following is the recommended solder reflow profile o 4 r Temperature Critical Zone T to Tp 25 t 25 C to Peak IPC O20b 5 1 Profile Feature Average ramp up rate T to Tp Preheat Temperature Min Tsmin Temperature Max Tsmax Time min to max ts Tsmax to TL Ramp up Rate Time maintained above Temperature TL Time tL Peak Temperature Tp Time within BC of actual Peak Temperature tp Ramp down Rate Time 25 to Peak Temperature Pb Free Assembly 3 C second max 150 200 60 180 seconds 3 second max 217 60 150 seconds 245 0 50 10 30 seconds 6 C second max 8 minutes max NOTE All temperatures refer to topside of the package measured on the package body surface NOTE GE865 module can accept only one reflow process k n ee ec s Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved Y EU S S NT re page 53 of 58 Za o Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 12 4 Packing system The Telit GE865 modules are packaged on trays of 50 pieces each This is especially suitable f
31. more if the device is developed for the US market and or Canada market it shall comply with the FCC and or IC approval requirements This device is to be used only for mobile and fixed application In order to re use the Telit FCC IC approvals the antenna s used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co located or operating in conjunction with any other antenna or transmitter If antenna is installed with a separation distance of less than 20 cm from all persons or is co located or operating in conjunction with any other antenna or transmitter then additional FCC IC testing may be required End Users must be provided with transmitter operation conditions for satisfying RF exposure compliance Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed operating configurations 6 2 GSM Antenna PCB line Guidelines e Ensure that the antenna line impedance is 50 ohm e Keep the antenna line on the PCB as short as possible since the antenna line loss shall be less than 0 3 dB e Antenna line must have uniform characteristics constant cross section avoid meanders and abrupt curves e Keep if possible one layer of the PCB used only for the Ground plane e Surround on the sides over and under the antenna line on PCB with Ground avoid having other signal tracks facing directly the antenna line track e The ground around the antenna line o
32. n PCB has to be strictly connected to the Ground Plane by placing vias once per 2mm at least e Place EM noisy devices as far as possible from GE865 antenna line e Keep the antenna line far away from the GE865 power supply lines e f you have EM noisy devices around the PCB hosting the GE865 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 e f you don t have EM noisy devices around the PCB of GE865 by using a strip line on the superficial copper layer for the antenna line the line attenuation will be lower than a buried one EET forbidden without Telit Communications S p A written authorization All Rights Reserved page 26 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 6 3 GSM Antenna Installation Guidelines e Install the antenna in a place covered by the GSM signal e If the device antenna is located greater then 20cm from the human body and there are no co located transmitter then the Telit FCC IC approvals can be re used by the end product e If the device antenna is located less then 20cm from the human body or there are no co located transmitter then the additional FCC IC testing may be required for the end product Telit FCC IC approvals cannot be reused e Antenna shall not be installed inside metal cases e Antenna shall be installed also according A
33. n ona Sw S TYAN nm Joona MUNII nnum NR nv vpans moworwa gn Dy GE865 QUAD 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 d E z 5 i a EA E e a n Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 5 of 58 Ee o Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 2 GE865 Mechanical Dimensions The Telit GE865 QUAD module overall dimension are e Length 22mm e Width 22mm e Thickness 3 0 mm 3 e 1 DETAIL A SCALE SI KS SECTION A A x J f A oO OO OO 1 i i A Q 0010000 d i O10 O OO SN KS H J pee X incu Se 000006 Kee al T g O10 o CO S FOO 2 8 goo Oo 00 0000 giao os p 99000000 m 4 S oe Ae ve 2240 15 y i pt S a J n without Telit Communications S p A written authorization All Rights Reserved page 6 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 3 GE865 module connections 3 1 PIN OUT
34. 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 9 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 page 18 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 5 3 General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps e the electrical design e the thermal design e the PCB layout 5 3 1 Electrical Design Guidelines The electrical design of the power supply depends strongly from the power source where this power is drained We will distinguish them into three categories e 5V input typically PC internal regulator output e 12V input typically automotive e Battery 5 3 1 1 5V input Source Power Supply Design Guidelines e The desired output for the power supply is 3 8V hence there s not a big difference between the input source and the desired output and a linear regulator can be used A switching power supply will not be suited because of the low drop out requirements e When using a linear regulator a proper heat sink shall be provided in order to dissipate the power generated e A Bypass low ESR capacitor of ade
35. ntenna manufacturer instructions i d f Jv T i o W ip j 3 oft E l 2 ake 3 Ge d 0 vs LS d uM Ki d i d S a dell we J pea e E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 27 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 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 Telit GE865 interface circuits Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any digital pin CMOS 2 8 0 3V 3 1V when on Input level on any digital pin CMOS 1 8 0 3V 2 1V when on Input voltage on analog pins when on 0 8V 3 0V Operating Range Interface levels 2 8V CMOS Level Min Max Input high level 2 1V 3 0V Input low level OV 0 5V Output high level 2 2V 3 0V Output low level OV 0 35V For 1 8V signals Operating Range Interface levels 1 8V CMOS Level Min Max Input high level 1 6V 2 0V Input low level OV 0 4V Output high level 1 65V 2 0V Output low level OV 0 35V Current characteristics Level Typical Output Current 1mA Input Current 1uA page 28 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 7 1 Reset signal Signal Function UO Boa Ball RESET Phone reset A2 RESET is used to reset the GE865 QUAD modules
36. of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 8 Serial Ports The serial port on the Telit GE865 QUAD is the core of the interface between the module and OEM hardware 2 serial ports are available on the module e MODEM SERIAL PORT 1 MAIN e MODEM SERIAL PORT 2 AUX 8 1 MODEM SERIAL PORT Several configurations can be designed for the serial port on the OEM hardware but the most common are e RS232 PC com port e microcontroller UART 9 2 8V 3V Universal Asynchronous Receive Transmit e microcontroller UART 9 5V or other voltages different from 2 8V Depending from the type of serial port on the OEM hardware a level translator circuit may be needed to make the system work The only configuration that doesn t need a level translation is the 2 8V UART The serial port on the GE865 is a 2 8V UART with all the 7 RS232 signals It differs from the PC RS232 in the signal polarity RS232 is reversed and levels The levels for the GE865 UART are the CMOS levels Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any 0 3V 3 1V digital pad when on Input voltage on 0 3V 3 1V analog pads when on Operating Range Interface levels 2 8V CMOS Level Min Max Input high level Vi 2 1V 3 0 V Input low level Vi OV 0 5V Output high level Vou 2 2V 3 0V Output low level VoL OV 0 35V mee e Reproduction forbidden without Telit Communications S p A
37. onally 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 RESET NAN VV V Unconditional Restart NS E p impulse N O yeu END The following flow chart shows the proper Reset procedure Start AT CMD Delay 1s 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 Ag Budg s e H MULA LF ay ze p gt Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 15 of 58 Bah i4 uf D d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 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 gt _ gt RESET E 2 Q2 ee ao 1Fs TOR Wii be Y sses NOTE The RESET signal is internally pulled up so the pin can be left floating if not used EH d Mte LL d e Bez c 4 Cd e H
38. ontrol is implemented e Ou tr EE gp ithout Telit Communications S p A written authorization All Rights Reserved page 31 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 8 2 RS232 level translation In order to interface the Telit GE865 with a PC com port or a RS232 EIA TIA 232 application a level translator is required This level translator must e invert the electrical signal in both directions e change the level from 0 2 8V to 415 15V Actually the RS232 UART 16450 16550 16650 amp 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 OV 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 are 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 2 8V UART to the RS232 level The receiver is the translator from the RS232 level to 0 2 8V UART In order to translate the whole set of control lines of the UART you will need e 5drivers e 3 receivers CO The digital input lines working at 2 8V CMOS have an absolute maximum input voltage of 3
39. or led CMOS 1 8V B1 ON_OFF Input command for switching power ON or OFF 47K Pull Up Pull up to VRTC toggle command page 7 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 Ball Signal UO Function Note Type E2 PWRMON O Power ON Monitor CMOS 2 8V H5 Antenna O Antenna output 50 ohm RF Service pin shall be used to upgrade the module from ASC1 RXD AUX TXD_AUX The pin shall be tied low to enable the feature eil Seme only in case of a Reflashing activity It is ONOS AEV required for debug purpose to be connected to a test pad on the final application GPIO D3 GPIO 01 l O GPIOO1 Configurable GPIO CMOS 2 8V D2 GPIO 02 JDR l O GPIOO2 UO pin Jammer Detect Report CMOS 2 8V EA GPIO_03 l O GPIOO3 GPIO I O pin CMOS 2 8V H7 GPIO 04 TX DISAB UO GPIO04 Configurable GPIO TX Disable input CMOS 2 8V G2 GPIO 05 RFTXMON I O See Configurable GPIO Transmitter ON CMOS 2 8V H8 GPIO 06 ALARM UO GPIOO6 Configurable GPIO ALARM CMOS 2 8V G6 GPIO 07 BUZZER UO GPIOO7 Configurable GPIO Buzzer CMOS 2 8V D4 GPIO 08 UO GPIOO8 Configurable GPIO CMOS 2 8V F4 GPIO 09 VO GPIO09 4 7 K Pull Up Open Drain E3 GPIO_10 l O GPIO10 4 7 K Pull Up Open Drain Power Supply F1 VBATT Main power supply Baseband Power F2 VBATT_PA Main power supply Radio PA Power F3 VBATT_PA Main power supply Radio PA Power G1 GND Ground Power C2 GND Ground Power C7 GND Ground Power E5 GND Ground Power
40. or the GE865 according to SMT processes for pick amp place movement requirements GE8x5 modules x50 UPPER SIDE LOWER SIDE Multi DEVICE amp Packaging label NOTE These trays can withstand at the maximum temperature of 65 C i we d Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 54 of 58 La e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 12 4 1 Moisture sensibility The level of moisture sensibility of GE865 module is 3 in according with standard IPC JEDEC J STD 020 take care all the relatives requirements for using this kind of components page 55 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 13 Conformity Assessment Issues The GE865 QUAD module are assessed to be conform to the R amp TTE Directive as stand alone products so If the module is installed in conformance with Dai Telecom installation instructions require no further evaluation under Article 3 2 of the R amp TTE Directive and do not require further involvement of a R amp TTE Directive Notified Body for the final product In all other cases or if the manufacturer of the final product is in doubt then the equipment integrating the radio module must be assessed against Article 3 2 of the R amp TTE Directive In all cases assessment of the final product must be
41. quate capacity must be provided in order to cut the current absorption peaks close to the GE865 a 100uF tantalum capacitor is usually suited e Make sure the low ESR capacitor on the power supply output usually a tantalum one is rated at least 10V e A protection diode should be inserted close to the power input in order to save the GE865 from power polarity inversion LE page 19 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 An example of linear regulator with 5V input is 5V input linear regulator I I I I I I i I I D I I I I I I I 1 I I I if i 3 8V I i MEDE OUT LT18eBLO c ee I I 1 l sl aal C201 5 Y INPUT 2 z 1 4 pees See tenuF 1 sHIMT Deed Ganz reos 3 leg amal SN R202 per rur BER a7 i Enn SE 1 d 3m 5 E ECS CONT E FF aca 1 BH E i i i END BND ENE 1 1 Dani l ECH 1 1 LE 1 anos i I I I I i I I I 5 3 1 2 12V input Source Power Supply Design Guidelines e The desired output for the power supply is 3 8V hence due to the big difference between the input source and the desired output a linear regulator is not suited and shall not be used A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by the GE865 e When using a switching regulator a 500k
42. s have been designed in order to be compliant with a standard lead free SMT process 12 3 2 Module finishing amp dimensions gt ig L D haf am L H A L m Y aaa atat rn rie af m y 7 S _ s Eu Lo E 1 ff E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 48 of 58 Ee o Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 12 3 3 Suggested Inhibit Area In order to easily rework the GE865 is suggested to consider on the application a 1 5mm Inhibit area around the module Ooo0o0oo0200 OO0O000000 O00 O00 O00 Oooooocooo oo0oo000000 D OOOoOOO00 oooocdono ooo oooo Lan It is also suggested as common rule for an SMT component to avoid having a mechanical part of the application in direct contact with the module d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 12 3 4 Debug of the GE865 in production To test and debug the mounting of the GE865 we strongly recommend to foreseen test pads on the host PCB in order to check the connection between the GE865 itself and the application and to test the performance of the module connecting it with an external computer Depending by the customer application these pads include but are not limited to the following signals e TXD RXD ON OFF RESET GND VBATT TX AUX RX AUX PWRMON SERVICE 12 3 5 Stencil Stencil s apertures layout can be the
43. sennsennens 20 5 8 1 3 Battery Source Power Supply Design Guidelines esseesseesseesseesseesesssrsenntennnsnnnnnnnnneennsennens 22 5 3 2 Thermal Design Guidelines sees ener nennen neni nnns 23 5 3 3 Power Supply PCB layout Guidelines sess 24 LES 37 25 6 1 e AE MEET UN E iioi erben ek sitas eet erku esa aci enn cine CEP ER eis 25 6 2 GSM Antenna PCB line Guidelines eeeeeeeeeeeeeeeeeeeee eene e eene 26 6 3 GSM Antenna Installation Guidelines eeeeeeeeeeeeeeeeeeeeeeeee eene nennen 27 7 Logic level specifications me 28 rM cen mcm 29 MEE 1 Bo 9 pe 30 8 1 MODEM SERIAL PORT iiie trae E Eben El Re ELYEELRE n ExE o ES E LEER KE ge SE CHEHN QE UDEELE REX Enana Eanna 30 8 2 HS232 level U abi SIBITOFI EN 32 8 3 5V UART level tran Sal ion scisteicccisnesttciateiireientsaneisieheccibassateietetbeviestucteisieiectitaasetiieiiacecieciscs 35 9 Audio E e ue EE 37 9 1 Microphone Paths Characteristic and Requirements cccccesseeeseeeneeeeeeeeneeseeeeees 37 10 OUTPUT LINES Speaker EET forbidden without Telit Communications S p A written authorization All Rights Reserved page 2 of 58 Z e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 10 1 Short CES CEU eee iudice desto eee ot cout usn se ch ee cee eee 38 10 2
44. st be done with particular care The microphone path is balanced and the OEM circuitry should be balanced designed to reduce the common mode noise typically generated on the ground plane However also an unbalanced circuitry can be used for particular OEM application needs Mic differential microphone path EET forbidden without Telit Communications S p A written authorization All Rights h e line coupling AC e line type balanced e coupling capacitor 2 100nF e differential input resistance 50kQ e differential input voltage lt 1 03V 865MV ms e microphone nominal sensitivity 45 dBV Pa e analog gain suggested 20dB e echo canceller type handset page 37 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 10 OUTPUT LINES Speaker 10 1 Short description The Telit GE865 provides one audio paths in receive section gt the Ear lines EPN1 and EPP are the Differential Line Out Drivers they can drive an external amplifier or directly a 16 OQ earpiece at 12dBFS FS acronym of Full Scale It is equal to OdB the maximum Hardware Analog Receive Gain of BaseBand Chip The output is a B T L type Bridged Tie Load and the OEM circuitry shall be designed bridged to reduce the common mode noise typically generated on the ground plane and to get the maximum power output from the device however also a single ended circuitry can be designed for particular OEM application
45. sted Inhibit Area tae crane n Fare eee ders edet sued dh e desk orate si ie eh an 49 12 3 4 Debug of the GE865 in production nennen nnne ener 50 ERR SUM ll METTE 50 12 3 6 PCB pad design nter doeet tete Eti reden Ea ette Lu ER RR SEDE ERE Ee EXER eee 51 12 3 7 Solder PAaStO E 52 ERC HOER TEE 53 MEA PGK ING SV SUC EE 54 12 4 1 Mortie Ee le 55 13 Conformity Assessment ISSUCS cccceeeeseeeeeeeeeeeeeeeeeeeeeeeneeeeeeeeeeeseeeeeseeneeeeeeeeeenenees 56 14 SAFETY RECOMMANDA TION Sivsisiicatticicscectceencasiceencaancenncastieencnswdenecacicnnncesndeancestceancosncn 57 15 DOCUMENT Change LOgJ iueiscisidssiessddx av tuna dads a 2d aiaiai FARA Edd acd Cu VEI P RARI Ed dad EVE IRR UM dE 58 Cer forbidden without Telit Communications S DA written authorization All Rights Reserved page 3 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 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 h
46. t and therefore the pull up resistor may be omitted 11 4 Using the RF Transmission Control GPIO4 The GPIO4 pin when configured as RF Transmission Control Input permits to disable the Transmitter when the GPIO is set to Low by the application In the design is necessary to add a pull up resistor 47K to PWRMON 11 5 Using the RFTXMON Output GPIO5 The GPIO5 pin when configured as RFTXMON Output is controlled by the GE865 module and will rise when the transmitter is active and fall after the transmitter activity is completed For example if a call is started the line will be HIGH during all the conversation and it will be again LOW after hanged up The line rises up 300ms before first TX burst and will became again LOW from 500ms to 1sec after last TX burst n EM wee p D Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 41 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 11 6 Using the Alarm Output GPIO6 The GPIO6 pad when configured as Alarm Output is controlled by the GE865 module and will rise when the alarm starts and fall after the issue of a dedicated AT command This output can be used to power up the GE865 controlling microcontroller or application at the alarm time giving you the possibility to program a timely system wake up to achieve some periodic actions and completely turn off either the application and the GE8
47. t in 2 parts TO SWITCHING V IN OTP 12V INPUT RT201 MF R110 JI C230 C232 D202 1nF luF 202 n Zem P6SMB30A x 30A 100V 50V 0805 1210 Doe 77 77 77 n S D D D H H H C o iS 39V T202 ees RCR 110D 150 M 7 4 2 vm Loco OUT 1 NC3 NCI ala R210 C235 C236 C226 C227 10 0K 1000uF luF luF 1our ZXR XR 1 16V 16V sov sov 0603 10X16 0805 1210 CONT D GD GD QD G R212 4 7K 5 0603 7 GD ead R207 sov 4 7K 0603 EI 0603 SWITCHING REGULATOR page 21 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 5 3 1 3 Battery Source Power Supply Design Guidelines e The desired nominal output for the power supply is 3 8V and the maximum voltage allowed is 4 2V hence a single 3 7V Li lon cell battery type is suited for supplying the power to the Telit GE865 module 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 GE865 and damage it NOTE DON T USE any Ni Cd Ni MH and Pb battery types directly connected with GE865 Their use can lead to overvoltage on the GE865 and damage it USE ONLY Li lon battery types e A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks a 100pF tantalum capacitor is usually suited e Make sure
48. the low ESR capacitor usually a tantalum one is rated at least 10V e A protection diode should be inserted close to the power input in order to save the GE865 from power polarity inversion Otherwise the battery connector should be done in a way to avoid polarity inversions when connecting the battery e The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A the suggested capacity is from 500mAh to 1000mAh Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 22 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 5 3 2 Thermal Design Guidelines The thermal design for the power supply heat sink should be done with the following specifications e Average current consumption during transmission PWR level max 500mA e Average current consumption during transmission PWR level min 100mA e Average current during Power Saving CFUN 5 2 4mA e Average current during idle Power Saving disabled 24mA NOTE The average consumption during transmissions depends on the power level at which the device is requested to transmit by the network The average current consumption hence varies significantly Considering the very low current during idle especially if 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
49. tion diode on the input to protect the supply from spikes and polarity inversion The placement of these components is crucial for the correct working of the circuitry A misplaced component can be useless or can even decrease the power supply performances The Bypass low ESR capacitor must be placed close to the Telit GE865 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 ripple provided the PCB trace from the capacitor to the GE865 is wide enough to ensure a dropless connection even during the 2A 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 2A current peaks are absorbed Note that this is not made in order to save power loss but especially to avoid the voltage drops on the power line at the current peaks frequency of 216 Hz that will reflect on all the components connected to that supply introducing the noise floor at the burst base frequency For this reason while a voltage drop of 300 400 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 your application doesn t have audio interface but only uses the data feature of the Telit GE865 then this noise is not so disturbing and power supply layout design can
50. ute Maximum Ratings Not Functional Parameter Min Max Input level on any digital pin when on 0 3V 3 1V CMOS 2 8 Input level on any digital pin when on 0 3V 2 1V CMOS 1 8 Input voltage on analog pins when on 0 3V 3 0V Operating Range Interface levels 2 8V CMOS Level Min Max Input high level 2 1V 3 0V Input low level OV 0 5V Output high level 2 2V 3 0V Output low level OV 0 35V For 1 8V signals Operating Range Interface levels 1 8V CMOS Level Min Max Input high level 1 6V 2 0V Input low level OV 0 4V Output high level 1 65V 1 85V Output low level OV 0 35V ED ts zu MER S Ee i Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 40 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 11 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 2 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 2 8V CMOS then it can be buffered with an open collector transistor with a 47K pull up to 2 8V 11 3 Using a GPIO Pad as OUTPUT The GPIO pads when used as outputs can drive 2 8V CMOS digital devices or compatible hardware When set as outputs the pads have a push pull outpu
51. written authorization All Rights Reserved page 30 of 58 d e Telit GE865 Hardware User Guide 1vv0300799 Rev 4 02 04 09 The signals of the GE865 serial port are RS232 Signal GE865 Name Usage Pin QUAD PY Number Pad Number 1 DCD dcd uart B5 Data Carrier Detect Output from the GE865 that indicates the carrier presence 2 RXD A4 Transmit line see Note Output transmit line of GE865 UART tx uart 3 TXD A3 Receive line see Note Input receive of the GE865 UART rx uart 4 DTR dtr uart B3 Data Terminal Ready Input to the GE865 that controls the DTE READY condition 5 GND Con T ME5 Ground ground E7 G1 G3 G4 G5 H3 H6 6 DSR dsr_uart B2 Data Set Ready Output from the GE865 that indicates the module is ready 7 RTS rts_uart A1 Request to Send Input to the GE865 that controls the Hardware flow control 8 CTS cts uart Clear to Send Output from the GE865 that controls the Hardware flow control 9 RI ri uart Ring Indicator Output from the GE865 that indicates the incoming call condition NOTE According to V 24 RX TX signal names are referred to the application side therefore on the GE865 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 GE865 serial port and viceversa for RX p TIP For a minimum implementation only the TXD and RXD lines can be connected the other lines can be left open provided a software flow c

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