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GE864 Harware User Guide

1. During the fast charge phase the process proceeds with a current limited charging this current limit depends on the required time for the complete charge and from the battery pack capacity During this phase the voltage across the battery terminals still raises but at a lower rate Once the battery voltage reaches its maximum voltage then the process goes into its third state Final charging The voltage measure to change the process status into final charge is very important It must be ensured that the maximum battery voltage is never exceeded otherwise the battery may be damaged and even explode Moreover for the constant voltage final chargers the constant voltage phase final charge must not start before the battery voltage has reached its maximum value otherwise the battery capacity will be highly reduced The final charge can be of two different types constant voltage or pulsed GE864 QUAD PY uses constant voltage r3 Jie te ds E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 23 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 The constant voltage charge proceeds with a fixed voltage regulator very accurately set to the maximum battery voltage and hence the current will decrease while the battery is becoming charged When the charging current falls below a certain fraction of the fast charge current value then the battery is consi
2. CU on the VBATT pads Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 15 of 77 P d e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 For example 1 Let s assume you need to drive the ON pad with a totem pole output of a 3 5 V microcontroller uP OUTTX ON z Q2 D DUT BC847BW Fs 3 5 4 ov LL Is Power ON OFF ingulse GND 2 Let s assume you need to drive the ON pad directly with an ON OFF button OND Reproduction forbidden without Telit Communications S p A written authorization All Rights d page 16 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 4 2 Turning OFF the GE864 QUAD PY The turning off of the device can be done in three ways e by software command see GE864 QUAD PY 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 GE864 QUAD PY the pad ON must be tied low for at least 2 seconds and then released The same circuitry and timing for the power on shall be used The device shuts down after the release of the ON pad TIP To check if the device has powered off the hardware line PWRMON should be monitore
3. EE 57 10 7 2 EVK2 Audio Lines Characteristics sessionen ie ea aaa Ea N AEE NE 58 11 General Ereegnes 59 11 1 Using a GPIO Pad as INPUT KT 59 11 2 Using a GPIO Pad as OUTPUT iere eie eeu eene rcu eie eoa re nu Cu re ue o ce e ca co Ene HE reo inea inaa 59 11 3 Using the RFTXMON Output GPIOD LLLLeeueeeeeeeLeeeeeeeeeeeee esee eren enne nnn 60 11 4 Using the Alarm Output GPIQG iiiiee nie e taki n niunt inu da uu am a UR Rau a a a end YR Ride 60 11 5 Using the Buzzer Output GRIOT gereest Eu bia aE CE kee HAN HK Rn EUR DELE YQ A 6S RENE FUERO ERA RA Ua nnn 61 11 6 Indication of network service availability eee 62 11 7 RIC Bypass QUE usce e anana Qd OE CEP BE C RS RU SEUE MC EK Mq IRI E Der bhOCOnN ranea aerea 63 11 8 VAUX1 power output EE 63 12 DAC and le E 64 12 1 DAC ee E EE 64 12 1 1 Bree 64 121 2 Enabling DAC cerne rentre tenet ede rene E Eee ebat er E ree Maus eae XE CHA 65 12123 LOW Pass Filler TN 65 12 2 ADC Converter neis noun nonna xk E RR NRER RRYRR NR ER KNYRR RENE RNRRNRERKYRNKRRRENRNR ERRNERRAVRRRRERR EXENN aaa 66 12 2 1 EENEG lege 66 12 2 2 Using ADC Converter 66 12 3 Mounting the GE864 on your Board esses enne 67 12 3 1 General 12 3 2 x Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserve
4. 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 4mA e Average current during idle Power Saving disabled 23mA 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 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
5. Hz 3 dB 655MVms open circuit DC balanced 280 150 4000 Hz 3 dB 500 mW 0280 1 350mW LIS page 58 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 11 General Purpose I O The general purpose UO 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 GE864 QUAD PY firmware and acts depending on the function implemented Not all GPIO pads support all these three modes GPIO5 supports all three modes and can be input output RFTX monitor output Alternate function GPIO6 supports all three modes and can be input output alarm output Alternate function GPIO7 supports all three modes and can be input output buzzer output Alternate function 11 1 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 connected to GPIO1 or can be buffered with an open co
6. VBATT TX TRACE RX TRACE PWRMON 12 3 5 Stencil Stencil s apertures layout can be the same of the recommended footprint 1 1 we suggest a thickness of stencil foil 120um Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 69 of 77 wireless solutions GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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 29 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 d BR Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 70 of 77 wireless solutions GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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
7. a starting point for properly developing your product with the Telit GE864 QUAD PY module For further hardware details that may not be explained in this document refer to the Telit GE864 QUAD PY Product Description document where all the hardware information is reported NOTICE EN The integration of the GSM GPRS GE864 QUAD PY 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 GE864 QUAD PY all interno dell applicazione dell utente dovra rispettare le indicazioni progettuali descritte in questo manuale DE Die integration des GE864 QUAD PY GSM GPRS Mobilfunk Moduls in ein Ger t mu gem der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen SL Integracija GSM GPRS GE864 QUAD PY modula v uporabni ki aplikaciji bo morala upo tevati projektna navodila opisana v tem piro niku SP La utilizaci n del modulo GSM GPRS GE864 QUAD PY 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 GE864 QUAD PY dans l application de l utilisateur sera faite selon les r gles de conception d crites dans ce manuel HE aen maa Sy PVR TYAN nt Joona Engt NNIT nw nu wean oworwa Yun Dy GE864 QUAD PY The information presented in this document is believed to be accurate and
8. 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 3V UART level to the RS232 level while the receiver is the translator from RS232 level to 0 3V UART In order to translate the whole set of control lines of the UART you will need Odriver 3 receiver NOTE The digital input lines working at 2 8VCMOS have an absolute maximum input voltage of 3 75V therefore the level translator IC shall not be powered by the 3 8V supply of the module Instead it shall be powered from a 2 8V 3 0V dedicated power supply This is because in this way the level translator IC outputs on the module side i e GE864 inputs will work at 3 8V interface levels stressing the module inputs at its maximum input voltage This can be acceptable for evaluation purposes but not on production devices NOTE In order to be able to do in circuit reprogramming of the GE864 firmware the serial port on the Telit GE864 shall be available for translation into RS232 and either it s controlling device shall be placed into tristate disconnected or as a gateway for the serial data when module reprogramming occurs Only RXD TXD GND and the On off module turn on pad are required to the reprogramming of the module the other lines are unused All applicator shall include in their design such a way of reprogramming the GE864 v Reproduction forbidden
9. on any 0 3V 3 75V digital pad when on Input voltage on 0 3V 3 0 V analog pads when on Operating Range Interface levels 2 8V CMOS Level Min Max Input high level Vin 2 1V 99V Input low level Vi OV 0 5V Output high level Vox 2 2V 3 0V Output low level Vo OV 0 35V UN j AE T Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 32 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 The signals of the GE864 serial port are RS232 Signal GE864 Name Usage Pin QUAD Number PY Pad Number 1 DCD D9 Data Carrier Detect Output from the GE864 QUAD PY that dcd uart indicates the carrier presence 2 RXD H8 Transmit line see Note Output transmit line of GE864 QUAD PY tx uart UART 3 TXD E7 Receive line see Note Input receive of the GE864 QUAD PY rx uart UART 4 DTR B7 Data Terminal Input to the GE864 QUAD PY that dtr uart Ready controls the DTE READY condition 5 GND A1 F1 H1 Ground ground L1 H2 L2 J3 Kore 6 DSR E11 Data Set Ready Output from the GE864 QUAD PY that dsr_uart indicates the module is ready 7 RTS F7 Request to Send Input to the GE864 QUAD PY that rts uart controls the Hardware flow control 8 CTS F6 Clear to Send Output from the GE864 QUAD PY that cts uart controls the Hardware flow control 9 RI ri uart B6 Ring Indicator Output from the GE864 QUAD PY that indicates the incoming call
10. periods dramatically reducing the sleep consumption to few pA In battery powered devices this feature will greatly improve the autonomy of the device CO NOTE During RESET the line is set to HIGH logic level page 60 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 11 5 Using the Buzzer Output GPIO7 The GPIO7 pad when configured as Buzzer Output is controlled by the GE864 QUAD PY 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 Q102 s2F BZ101 SOT 23 SMUS 1227 SMBT2907A A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the GPIOT 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 Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 61 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 11 6 Indication of network service availability The STAT LED pin status shows information on the network service availability and Call status In the GE864 modules the STAT LED usually needs an external transistor to drive an ex
11. 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 GE864 QUAD PY 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 GE864 QUAD PY you must ensure that your application can dissipate it CO Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 25 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 5 2 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 protection 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 GE864 QUAD PY 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 GE864 QUAD PY is wide enough to ensure a dropless connection even during the 2A current peaks The protection diode must be placed close to the
12. reliable However no responsibility is assumed by Telit Communication 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 Communication S p A other than for circuitry embodied in Telit products This document is subject to change without notice Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 7 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 2 GES864 Mechanical Dimensions The Telit GE864 module overall dimension are e Length 30 mm e Width 30 mm e Thickness 2 8 mm y li d D og e j D Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 8 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 3 GE864 module connections 3 1 PIN OUT Ball Signal UO Function Internal PULL UP Type Audio H9 EAR MT AO Handset earphone signal output phase Audio G10 EAR Mix AO Handset earphone signal output phase Audio H10 EAR HEI AO Handsfree ear output phase Audio J10 EAR HF AO Handsfree ear output phase Audio Handset mic signal input phase nom level J8 MIC_MT Al 50mVrms Audio Handset mic signal input phase nom level G9 MIC_MT Al 50mVrms Audio Hand
13. without Telit Communications S p A written authorization All Rights Reserved page 34 of 77 An example of level translation circuitry of this kind is RS232 LEVEL TRSANSLATOR Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 The RS232 serial port lines are usually connected to a DB9 connector with the following layout DCD RSe3 DSA_AS232 rae TX RS232 C n RTs RSse32 RX RS232 Cu CTS_AS232 DTR Rse32 Ca RI RS232 C Qu Lil E GND page 35 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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 TO TELIT TO DEM HARDWARE MODULE Hat DV AxD_2 BY TE 7SZ 07AFE GMO TIP This logic IC for the level translator and 2 8V pull ups not the 5V one can be powered directly from PWRMON D line of the GE864 QUAD PY Note that the TC7SZ07AE has open drain output therefore the resistor R2 is mandatory Reproduction forbidden without Telit Communications S p A writt
14. 1 489 1 and EN 301 489 7 e 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 GE864 QUAD PY module is conform 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 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 page 75 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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
15. Guidelines e Install the antenna in a place covered by the GSM signal e The Antenna 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 e Antenna shall not be installed inside metal cases e Antenna shall be installed also according Antenna manufacturer instructions Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 29 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 7 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 GE864 QUAD PY interface circuits Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any 0 3V 3 75V digital pin when on Input voltage on 0 3V 3 0 V analog pins when on Voltage on Buffered 0 3V 25V pins Operating Range Interface levels 2 8V CMOS Level Min Max Input high level 2 1V 3 3V Input low level OV 0 5V Output high level 2 2V 3 0V Output low level OV 0 35V For 2 0V signals Operating Range Interface levels 2 0V CMOS Level Min Max Input high level 1 6V 3 3V Input low level OV 0 4V Output high level 1 65V 2 2V Output low level OV 0 35V Current characteristics Level Typical Output Current 1mA Input Curr
16. Hardware User Guide 1vv0300694 Rev 7 08 02 07 12 4 Packing system The Telit GE864 modules are packaged on trays of 20 pieces each This is especially suitable for the GE864 according to SMT processes for pick amp place movement requirements ERN LOD i G Ju Wi 1 d amp 2 gd ZA Jo RU jg KEE T be tg d Je Du d ug iu P EM NIA Wo wi nir o raap Section A A The size of the tray is 329 x 176mm NOTE These trays can withstand at the maximum temperature of 65 C Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 73 of 77 P d e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 12 4 1 GE864 orientation on the tray Ref No rounded corner on module s printed circuit board FCC ID RI7GE364 IC 5131A GE864 ES Vi The modules on the tray are oriented as shown in A and the tray is oriented toward left as shown in B 9 mat 12 4 2 Moisture sensibility The level of moisture sensibility of GE864 module 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 au
17. JDR I O Telit GPIOO2 UO pin Jammer detect report CMOS 2 8V L9 TGPIO 07 BUZZER VO Telit GPIOO7 Configurable GPIO Buzzer CMOS 2 8V H6 TGPIO 16 lO Telit GPIO16 Configurable GPIO CMOS 2 8V K10 TGPIO 13 I O Telit GPIO13 Configurable GPIO CMOS 2 8V K8 TGPIO_05 RFTXMON I O TE Configurable GPIO Transmitter CMOS 2 8V L10 TGPIO 21 I O Telit GPIO21 Configurable GPIO CMOS 2 8V ER TGPIO 22 VO Telit GPIO22 Configurable GPIO EE H3 TGPIO 10 VO Telit GPIO10 Configurable GPIO CMOS 2 8V Power Supply J1 VBATT Main power supply Power K1 VBATT Main power supply Power m pue j Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page Du of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 Ball Signal UO Function Internal PULL UP Type J2 VBATT Main power supply Power K2 VBATT Main power supply Power A1 GND Ground Power F1 GND Ground Power H1 GND Ground Power L1 GND Ground Power H2 GND Ground Power L2 GND Ground Power J3 GND Ground Power K3 GND Ground Power L3 GND Ground Power K4 GND Ground Power K5 GND Ground Power D6 GND Ground Power K6 GND Ground Power L6 GND Ground Power A11 GND Ground Power F11 GND Ground Power L11 GND Ground Power RESERVED A10 A3 A4 x A5 A6 A7 A8 A9 B10 B11 B2 B8 B9 CA CR D2 D3 E1 E10 E3 E4 3 F2 F3 page 11 of 77 Ball Signal UO Funct
18. PULL UP Type DAC and ADC C7 DAC_OUT AO Digital Analog converter output D A J11 ADC_IN1 Al Analog Digital converter input A D H11 ADC_IN2 Al Analog Digital converter input A D G11 ADC_IN3 Al Analog Digital converter input A D Miscellaneous Functions A2 RESET l Reset input E2 VRTC AO VRTC Backup capacitor Power D8 STAT LED O Status indicator led CMOS 1 8V G1 CHARGE Al Charger input Power G2 CHARGE Al Charger input Power Input command for switching power ON or OFF J5 ONOFF ue Pul up to VBATT second D5 VAUX1 Power output for external accessories L8 PWRMON O Power ON Monitor CMOS 2 8V L4 Antenna O Antenna output 50 ohm RF GPIO G4 TGPIO 12 I O Telit GPIO12 Configurable GPIO CMOS 2 8V C2 TGPIO_03 I O Telit GPIOO3 Configurable GPIO CMOS 2 8V B3 TGPIO 04 I O Telit GPIO04 Configurable GPIO CMOS 2 8V c3 TGPIO 20 I O Telit GPIO20 Configurable GPIO CMOS 2 8V B4 TGPIO 14 lO Telit GPIO14 Configurable GPIO CMOS 2 8V D1 TGPIO 11 lO Telit GPIO11 Configurable GPIO CMOS 2 8V B1 TGPIO 19 I O Telit GPIO19 Configurable GPIO CMOS 2 8V C1 TGPIO 01 I O Telit GPIO01 Configurable GPIO CMOS 2 8V K7 TGPIO_18 VO Telit GPIO18 Configurable GPIO CMOS 2 8V H5 TGPIO_17 VO Telit GPIO17 Configurable GPIO CMOS 2 8V F5 TGPIO_15 I O Telit GPIO15 Configurable GPIO CMOS 2 8V K11 TGPIO_08 I O Telit GPIO08 Configurable GPIO CMOS 2 8V B5 TGPIO_06 ALARM VO Telit GPIOO6 Configurable GPIO ALARM CMOS 2 8V c9 TGPIO 09 VO Telit GPIOO9 GPIO UO pin CMOS 2 8V E6 TGPIO 02
19. S e leli wireless solutions GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 EN OR A Ves n a a pl bw L 4 D d Making machines talk rA e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 This document is relating to the following products GE GE GE864 QUAD 3990250648 GE864 PY 3990250650 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 2 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 Contents MESI r i PEERS 7 2 GE864 Mechanical Dimensions eeeeeeeesesesssseeeeeeee nennen nennen nnn nnn nnmnnn nnna 8 3 GE664 module connections iso cuoc conn no s san eege 9 M JJ Da LR SE 9 3 1 1 EI E 13 4 Hardware Eer 15 4 1 Turning ON the GE964 QUAD PY E 15 4 2 Turning OFF the GE864 QUAD PY use 17 4 2 1 Hardware shutdown RR ESEE EEEE 17 4 2 2 Hardware Unconditional Restart 17 MM Ve sl Ut 19 5 1 Power Supply Requirements ecce o eio on nr ren rein rin aon rr rane oen cona aoro apre aE I aiU rear p Ear 19 5 2 General Design RUNES eteetesegestt eessen eeh SEENEN EE 20 5 2 1 Electrical DESIGN GuldeliliGs i otc trie eee deri ber veta eee eedem y y nedee b eese ba be Ye teu Yd 20 5 2 1 1 5V input Source Power Supply Design Guidelines ssssnnsnsssssse
20. SW user guide or to GE864 QUAD PY AT commands specification for the full description of this function NOTE The DAC frequency is selected internally D A converter must not be used during POWERSAVING 12 1 3 Low Pass Filter Example R1 R2 R3 P1 AAA AAA AAA P3 12k 12k 12k INPUT dac out OUTPUT C1 100nF C2 100nF C3 L 100nF P2 P4 GND GND GND GND V GND I P Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 65 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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 lt 1 mV The GE864 QUAD PY module provides 3 Analog to Digital Converters The input lines are ADC_IN1 available on Ball J11 and Pin 19 of PL102 on EVK2 Board CS1152 ADC_IN2 available on Ball H11 and Pin 20 of PL102 on EVK2 Board CS1152 ADC_IN3 available on Ball G11 and Pin 21 of PL102 on EVK2 Board CS1152 12 2 2 Using ADC Converter An AT command is available to use the ADC function The command is ATHADC 1 2 The read value is expressed in mV Refer to SW user guide or to GEB64 QUAD PY AT commands specification for the full description of this fun
21. SW volume level step number of SW volume steps li 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 DC bridged 2140 4 Q typical 150 4000 Hz 3 dB 1310 mV qs typ open circuit 328mVrms 16 O 12dBFS 2dB 10 DC bridged 2140 40 gt 1 70 150 4000 Hz 3 dB 1310 mV qs typ open circuit 656 MVms typ open circuit 2dB 10 EU Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 52 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 10 3 General Design Rules There are several configurations for the audio output path but the various design requirements can be grouped into three different categories e handset earphone low power typically a handset e hands free earphone low power typically a earphone e car kit speakerphone high power typically a speaker The three groups have different power requirements usually the first two applications need only few mW of power which can be directly drained from the GE864 QUAD PY pads provided a suited speaker is used This direct connect design is the cheaper and simpler solution and will be suited for the most of the earphone design requirements There s no need to decouple the output ear lines if a suited earpiece is connected For the last group the speakerphone a power amplifier is required to raise the output power up to 5 10W require
22. User Guide 1vv0300694 Rev 7 08 02 07 AUDIO Signals balls SIM CARD interface balls TRACE Signals balls Prog data Hw Flow Control signals balls DAC and ADC signals balls MISCELLANEOUS functions signals balls TELIT GPIO balls POWER SUPPLY VBATT balls POWER SUPPLY GND balls RESERVED EE P 3 e Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 14 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 4 Hardware Commands 4 1 Turning ON the GE864 QUAD PY To turn on the GE864 QUAD PY 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 ONS jJ L A A A 7 Q1 EE MS NA A V V V s Power ON impulse NU Ca AA O R2 FTG os NOTE don t use any pull up resistor on the ON line it is internally pulled up Using pull up resistor may bring to latch up problems on the GE864 QUAD PY 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 D ends with a or with a bar over the name NOTE The GE864 QUAD PY turns fully on also by supplying power to the Charge pad provided there s a battery
23. 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 The text of the Directive 99 05 regarding telecommunication equipments is available while the applicable Directives Low Voltage and EMC are available at http europa eu int comm enterprise electr equipment index en htm page 76 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 15 Document Change Log Revision ISSUE O ISSUE 1 ISSUE 2 ISSUE 3 ISSUE 4 ISSUE 5 ISSUE 6 ISSUE 7 Date 12 06 06 22 11 05 19 12 05 07 02 06 07 09 06 03 10 06 23 10 06 08 02 07 Changes Release First ISSUE 0 Added notice on page 4 Added Paragr 10 Conformity Assessment Issues Added products order codes table Added Disclaimer Added Safety Recommendations Full Review of the manual Added ADC description Added DAC description Added Pinout and Process flow description Added Packaging TGPIO23 now RESERVED modi
24. are User Guide 1vv0300694 Rev 7 08 02 07 9 5 Microphone Buffering As seen previously a microphone shall be connected to the input pins of the GE864 QUAD PY through a buffer amplifier that boosts the signal level to the required value Again the buffered microphone circuitry can be balanced or unbalanced where possible it is always preferable a balanced solution The buffering circuit shall be placed close to the microphone or close to the microphone wire connector 9 5 1 Buffered Balanced Mic A sample circuit can be BALANCED MICROPHONE BUFFER 20dB 39 Ses M ER oS i ATK SS i 17 DECOUPLING CAPACITORS GND a U02 m EE o A T53Y8121D 2t a 15K vt i BES m v EE i ha 2 ne 2g z Bu C527 R6145 mo G __ 100m 47k T 1 1 Er un to i 3 FROM 1 a3 GE863 MIC m d So 33v o Ww ge ty So GND ann a UBD m SE T83VB121D em r ma o 15K oT ase E e EE IT 4 ee FI 150K This circuit has a gain of 10 times 20 dB and is therefore suited for the Mic MT input if you have a microphone with a sensitivity close to the suggested one 45 dBV ms Pa If your microphone has a different sensitivity or if the buffer is connected to the Mic HF inputs then a gain adjustment shall be done by changing resistors R604 and R606 if the required value is not a s
25. ass 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 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 GE864 QUAD PY 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 5 2 1 4 Battery Charge control Circuitry Design Guidelines The charging process for Li lon Batteries can be divided into 4 phases e Qualification and trickle charging e Fast charge 1 constant current e Final charge constant voltage or pulsed charging e Maintenance charge The qualification process consists in a battery voltage measure indicating roughly its charge status If the battery is deeply discharged that means its voltage is lower than the trickle charging threshold then the charge must start slowly possibly with a current limited pre charging process where the current is kept very low with respect to the fast charge value the trickle charging During the trickle charging the voltage across the battery terminals rises when it reaches the fast charge threshold level the charging process goes into fast charge phase
26. at the battery is not damaged by keeping it always fully charged Li lon rechargeable battery usually deteriorate when kept fully charged Last but not least in some applications it is highly desired that the charging process restarts when the battery is discharged and its voltage drops below a certain threshold GE864 QUAD PY internal charger does it As you can see the charging process is not a trivial task to be done moreover all these operations should start only if battery temperature is inside a charging range usually 5 C 45 C The GE864 QUAD PY measures the temperature of its internal component in order to satisfy this last requirement it s not exactly the same as the battery temperature but in common application the two temperature should not differ too much and the charging temperature range should be guaranteed NOTE For all the threshold voltages inside the GE864 QUAD PY all threshold are fixed in order to maximize Li lon battery performances and do not need to be changed NOTE In this application the battery charger input current must be limited to less than 400mA This can be done by using a current limited wall adapter as the power source NOTE When starting the charger from Module powered off the startup will be in CFUN4 to activate the normal mode a command AT CFUN 1 has to be provided d page 24 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 5 2 2 Thermal Design
27. be dangerous and has to be avoided in the following areas LI Where it can interfere with other electronic devices in environments such as hospitals airports aircrafts etc Q 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 security 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
28. ce load at high frequency in order to avoid auto oscillation this can be made with a capacitor 100nF in series with a resistor 150 When designing your application remember to provide an adequate bypass capacitor to the amplifier and place it close to the power input pin of the IC keeping the traces as short as possible 10 5Hands Free Earphone Low Power Design The same design considerations made for the handset are valid for the hands free earphone Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 55 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 10 6 Car Kit Speakerphone Design For the car kit speaker phone function the power output requirement is usually at least 4W therefore an amplifier is needed to boost the GE864 QUAD PY output The design of the amplifier shall comply with the following guidelines The input to the amplifier MUST be taken from the Ear HF audio path of the GE864 QUAD PY because of its echo canceller parameters suited to a car cabin use The amplifier shall have a gain of 30 40 times 29 32 dB to provide the desired output power of 5 10W with the signal from the GE864 QUAD PY Ear HF audio output lines If the amplifier has a fixed gain then it can be adjusted to the desired value by reducing the input signal with a resistor divider network The amplifier shall have a mute control to be used while not in conver
29. condition NOTE According to V 24 RX TX signal names are referred to the application side therefore on the GE864 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 GE864 serial port and viceversa for RX TIP For a minimum implementation only the TXD and RXD lines can be connected the other p lines can be left open provided a software flow control is implemented x Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 33 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 8 2 RS232 level translation In order to interface the Telit GE864 with a PC com port or a RS232 EIA TIA 232 application a level translator is required This level translator must invert the electrical signal in both directions change the level from 0 3V to 15 15V Actually the RS232 UART 16450 16550 16650 amp 16750 chipsets accept signals with lower levels on the RS232 side EIA TIA 562 allowing for 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 driver and receiver and
30. ction page 66 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 12 3 Mounting the GE864 on your Board 12 3 1 General The Telit GE864 modules have been designed in order to be compliant with a standard lead free SMT process 12 3 2 Module finishing amp dimensions Lead free Alloy Surface finishing Sn Ag Cu for all solder pads Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 67 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 12 3 3 Recommended foot print for the application GE864 CD OO Oo OO OO OO O CO OO 000000000 OO OO OO OO OO O O O 0 OO O00 O00 0 0 OO O OO 00 0 0 0 0 Kr O0 OO OO OO 0 O 0 OO O 0 0 0 O O O OQ OO OO 00000000 OOO OO C KG Si U0 0 3 2 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 68 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 12 3 4 Debug of the GE864 in production To test and debug the mounting of the GE864 we strongly recommend to foreseen test pads on the host PCB in order to check the connection between the GE864 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
31. d When PWRMON goes low the device has powered off 4 2 2 Hardware Unconditional Restart To unconditionally Restart the GE864 QUAD PY the pad RESET must be tied low for at least 200 milliseconds and then released The maximum current that can be drained from the ON pad is 0 15 mA A simple circuit to do it is RESET AAA LI V V EN j Unconditional Restart Wi ed impulse CN A CAM yoo 7 GND eos Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 17 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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 GE864 QUAD PY power regulator and improper functioning of the module The line RESET must be connected only in open collector configuration TIP 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 RESET 3 SS E Ge HE SE a 1F5 375 Me QO V 2 Reset Signal Operating levels Signal Min Max RESET Inputhigh 2 2V 3 3V RESET Input low OV 0 2V this signal is internally pulled u
32. d e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 TO SWITCHING VIN OTP 12V IHPUT RT201 MF R110 JI C230 C232 D202 1nF luF ses Zem P6SMB30A 5 30A 100V 50 0805 1210 DO 214AA 77 Lee Leed S N N A e D CN H H 1202 F EM U203 0n L5973D RCE LOD 150M VIN 2 sh A x 5 ue arla wcs NciL i i R210 C235 C236 C226 C227 10 0K 1000uF luF luF 1our ZXR XR 1 16v 16V sov sov 0603 10X16 0805 1210 CONT D aD Gp Gp R212 4 7K 5 0603 0603 SWITCHING REGULATOR Reproduction forbidden without Telit Communications S p A written authorization All Rights d page 22 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 5 2 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 GE864 QUAD PY 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 GE864 QUAD PY and damage it NOTE DON T USE any Ni Cd Ni MH and Pb battery types directly connected with GE864 QUAD PY Their D use can lead to overvoltage on the GE864 QUAD PY and damage it USE ONLY Li lon battery types e A Byp
33. d in a car cabin application All the designs shall comply with the following guidelines e Where possible use a bridged earphone circuitry to achieve the maximum power output from the device e Keep the earphone traces on the PCB and wires as short as possible e f your application requires a single ended earpiece and you want a direct connection then leave one of the two output lines open and use only the other referred to ground Remember that in this case the power output is 4 times lower than the bridged circuit and may not be enough to ensure a good voice volume e Make sure that the earphone traces in the PCB don t cross or run parallel to noisy traces especially the power line e The cable to the speaker shall be a twisted pair with both the lines floating for the bridged output type shielded with the shield to ground for the single ended output type 10 3 1 Noise Filtering The I O of the PCB should have a noise filter close to the connector to filter the high frequency GSM noise The filter can be a M formed by 2 capacitor and a inductance with the one capacitor of 39pF 0603 case and the other capacitor of 1nF 0603 the inductance shall have a value of 39uH CO Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 53 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 10 4 Handset Earphone Design As seen previously a 160 ea
34. d page 4 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 12 3 83 Recommended foot print for the application GEGGA sss 68 12 3 4 Debug of the GE864 in production eene nennen nnne nns 69 DE MEES gcn 69 12 3 0 PGB pad Ee EE 70 12 3 4 Soldernpaslte EE 71 12 3 8 GE864 Solder refiow nene nere en errem enn ener nene nennen 72 12 4 Packing SyeloPti ua secuiensntinnvidritlac assi iS GEaR E Fa MU EUM EF MM UK UM a aaaeaii aaaea REDDE ERE 73 12 4 1 GE864 orientation on the tray nce e teret ee te eee pede despide eu bebe eve tee degna ad 74 1242 Moisture sensibility 2 occ rete dese ecce ded epe eese cesa cec p ded evexit ee tace ue 74 13 Conformity Assessment ISSUES seen nnn nnn nnn nnn 75 14 SAFETY RECOMMANDATIONS ctia a a a aa a c aa a ac a a ads 76 15 Document Change Log aec D a 77 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 5 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 DISCLAIMER The information contained in this document is proprietary information of Telit Communications S p A Telit Communications S p A makes every effort to ensure the quality of the information it makes available Notwithstanding the foregoing Telit Communications S p A does not make any warranty as to the information contained herein and does not accept any liability for any injury loss
35. dered fully charged the final charge stops and eventually starts the maintenance The pulsed charge process has no voltage regulation instead the charge continues with pulses Usually the pulse charge works in the following manner the charge is stopped for some time let s say few hundreds of ms then the battery voltage will be measured and when it drops below its maximum value a fixed time length charging pulse is issued As the battery approaches its full charge the off time will become longer hence the duty cycle of the pulses will decrease The battery is considered fully charged when the pulse duty cycle is less than a threshold value typically 1096 the pulse charge stops and eventually the maintenance starts The last phase is not properly a charging phase since the battery at this point is fully charged and the process may stop after the final charge The maintenance charge provides an additional charging process to compensate for the charge leak typical of a Li lon battery It is done by issuing pulses with a fixed time length again few hundreds of ms and a duty cycle around 5 or less This last phase is not implemented in the GE864 QUAD PY internal charging algorithm so that the battery once charged is left discharging down to a certain threshold so that it is cycled from full charge to slight discharge even if the battery charger is always inserted This guarantees that anyway the remaining charge in the battery is a good percentage and th
36. designed a strong noise floor is generated on the ground and the supply this will reflect on all the audio paths producing an audible annoying noise at 216 Hz if the voltage drop during the peak current absorption is too much then the device may even shutdown as a consequence of the supply voltage drop TIP The electrical design for the Power supply should be made ensuring it will be capable of a peak current output of at least 2 A CO Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 19 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 5 2 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 2 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 5Vinput typically PC internal regulator output e 12V input typically automotive e Battery 5 2 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 re
37. duction forbidden without Telit Communications S p A written authorization All Rights Reserved 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 12 DAC and ADC section 12 1 DAC Converter 12 1 1 Description The GE864 QUAD PY module provides a Digital to Analog Converter The signal named DAC OUT is available on BGA Ball C7 of the GE864 QUAD PY module and on pin 17 of PL102 on EVK2 Board CS1152 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 E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 64 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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
38. ected to the GE864 QUAD PY through the PCB with the antenna pad In the case that the antenna is not directly developed on the same PCB hence directly connected at the antenna pad of the GE864 QUAD PY then a PCB line is needed in order to connect with it or with its connector CO Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 27 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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 GE864 QUAD PY ground pins Furthermore if the device is developed for the US market and or Canada market it shall comply to the FCC and or IC approval requirements This device is to be used only for mobile and fixed application The antenna s used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co located or operating in conjunction with any other antenna or transmitter End Users must be provided with transmitter operation conditions for satisfying RF exposure compliance OEM integrators must ensure that the end user has no manual instructions to remove or install the GE864 QUAD PY module Antennas used for this OEM module must not exceed 3dBi gai
39. en authorization All Rights Reserved page 36 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 NOTE The UART input line TXD rx uart of the GE864 QUAD PY is NOT internally pulled up with a resistor so there may be the need to place an external 47KQ pull up resistor either the DIR dtr uart and RTS rts uart input lines are not pulled up internally so an external pull up resistor of 47KQ may be required A power source of the internal interface voltage corresponding to the 2 8VCMOS high level is available at the PWRMON pin on the connector whose absolute maximum output current is 1mA A maximum of 9 resistors of 47 KO pull up can be connected to the PWRMON pin provided no other devices are connected to it and the pulled up lines are GE864 QUAD PY input lines connected to open collector outputs in order to avoid latch up problems on the GE864 QUAD PY Care must be taken to avoid latch up on the GE864 QUAD PY and the use of this output line to power electronic devices shall be avoided especially for devices that generate spikes and noise such as switching level translators micro controllers failure in any of these condition can severely compromise the GE864 QUAD PY functionality NOTE The input lines working at 2 8VCMOS can be pulled up with 47KQ resistors that can be connected directly to the PWRMON line provided they are connected as in this example NO OTHER devices than those suggested s
40. ent 1uA M e d Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 30 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 7 1 Reset signal Signal Function UO Boa Ball RESET Phonereset A2 RESET is used to reset the GE864 QUAD PY modules Whenever this signal is pulled low the GE864 QUAD PY is reset When the device is reset it stops any operation After the release of the reset GE864 QUAD PY 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 GE864 QUAD PY Use the ON OFF signal to perform this function or the ATHSHDN command Reset Signal Operating levels Signal Min Max RESET Inputhigh 2 0V 2 2V RESET Input low OV 0 2V this signal is internally pulled up so the pin can be left float
41. er Guide 1vv0300694 Rev 7 08 02 07 9 2 General Design Rules There are several configurations for the audio paths but the most effective difference is between balanced and unbalanced microphone configuration It is highly recommended to keep the whole microphone path balanced even if this means having 2 wires connecting the microphone instead of one needed plus ground in the unbalanced case The balanced circuitry is more suited because of its good common mode noise rejection reducing the 216 Hz burst noise produced during the GSM transmissions e Where possible use balanced microphone circuitry e Keep the microphone traces on the PCB and wires as short as possible e f your application requires an unbalanced microphone then keep the lines on the PCB balanced and unbalance the path close to the microphone wire connector if possible e For the microphone biasing voltage use a dedicated voltage regulator and a capacitor multiply circuit e Make sure that the microphone traces in the PCB don t cross or run parallel to noisy traces especially the power line e f possible put all around to the microphone lines a ground trace connected to the ground plane by several vias This is done in order to simulate a shielded trace on the PCB e The biasing circuit and eventually the buffer can be designed in the same manner for the internal and external microphones 9 3 Other considerations If your application is a hands free car k
42. ered as a thumb rule around 20aB For the earphone we shall distinguish two different types the earphones having the microphone sustained close to the mouth and the ones having the microphone on the earpiece cable The same considerations for the additional voice attenuation due to the distance from the microphone and the noise pick up can be made for the earphone having the microphone on the earpiece cable while the other kind of earphone shall be threaten as an handset p TIP how to compensate the losses in car cabin hands free condition The voice signal that in the normal spoken conditions produces on the microphone membrane an acoustic pressure of 4 7dBPa at 1kHz will have a further attenuation of 20dB due the 50cm distance Therefore a microphone having the suggested nominal sensitivity of 45dBV m Pa will produce a lower electrical that means MicVollage s 191777 0 33 40 Setting the microphone gain at 10dB 3 times the signal in the nominal conditions on the Mic HF inputs s of GE864 QUAD PY Telit Module will be Mic HF Level 0 33 10 3 1 10 d l l j M i Hence in these conditions the signal level on the Mic HF input pads of the GE864 QUAD PY is 10 dB 3 times lower than the nominal as suggested ges B EU Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 41 of 77 Z e Telit GE864 Hardware Us
43. errennenesrtnrrnnseestnnrrnrnneeree nn 20 5 2 1 2 12V input Source Power Supply Design Guidelines sse 21 5 2 1 3 Battery Source Power Supply Design Guidelines ssseeeee 23 5 2 1 4 Battery Charge control Circuitry Design Guidelines ccc eeeeeeeeeete eter eeneeeeeeaeeeeeenaeeeeeeaas 23 5 2 2 Thermal Design Guidellnes 2 cette aA AE abeat see bere gE dE 25 5 2 3 Power Supply PCB layout Guidelines AA 26 6 EE 27 6 1 GSM Antenna Requirements 2 2 sseeeseeeseeeseeeseeeseeeeeeeseeeseeesseeeseeeseenseeeseeeseeees 27 62 GSM Antenna PCB line Guidelines EENEG 28 63 GSM Antenna Installation Guidelines eseeeeeeeueeseeeeeeeeeeeeeee 29 7 Logic level specifications E 30 ZA E 5 poem rm 31 4E 217 fc e TRETEN 32 8 1 MODEM SERIAL PORT irr eres Serge lege codec deta thoes ege edd aad mne Eege ade Ne ee er 32 8 2 RS232 level translation eeeeeeee ei eeeeseeeeuee eene nenne nnn nhan nhan snas nsns nasa a sans ama asa r anna 34 BA 5V UART level translation cc ENEE DeEdeEgede Re aec Eee Ne ze in dea na Xe Cre ionge ENEE 36 9 Audio Section Overview eenegen 38 9 1 Microphone Paths Characteristic and Requirements sese 39 9 2 General Design Rules CO Reproduction forbidden without Telit Communications S p A written authorization All Right
44. f 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 page 26 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 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 a proper design 6 1 GSM Antenna Requirements As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE864 QUAD PY 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 3dBi Impedance 50 ohm Input power gt 2 W peak power VSWR absolute lt 10 1 max VSWR lt 2 1 recommended When using the Telit GE864 QUAD PY since there s no antenna connector on the module the antenna must be conn
45. fied low pass filter example for DAC 6 1 antenna characteristics Updated GE864 orientation on the tray layout Pinout updated Camera removed Added Stat Led and GPIO5 description added VAUX1 schematics updated for On_off reset level adapter 5V RS232 transceiver Power supply Modified Charger description page 77 of 77
46. gulator a proper heat sink shall be provided in order to dissipate the power generated e A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks close to the GE864 QUAD PY 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 GE864 QUAD PY from power polarity inversion ges ae Reproduction forbidden without Telit Communications S p A written authorization All Rights page of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 An example of linear regulator with 5V input is 5V input linear regulator I li l I I E l l l l l I I I I I l l I I E l l i 3 DM l MEDE OUT LT18eBLO c Lem I I 3 1 i RM aal C201 1 5 Y INPUT 2 z 1 4 pees See tenuF I Hh 1 ond d C203 L202 Acta aper Z E Rete g per rur DEN a7 i Enn SE 1 d 3m 5 E ECS CONT E FF aca 1 BM sto L l i BND BAD Ed i Aeos i san i d 1 open f l I I I it l I f 5 2 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
47. hone amplifier p TIP example of external microphone amplifier calculation Let s suppose to use the 1 differential microphone path In this case the maximum differential input voltage to Mic MI lines is 365MVims 1 03Vpp corresponding to 8 76dBV Now we can calculate the maximum voltage gain of an external microphone amplifier G4 MicLevel 20dB G 8 764BV 49 7 20 G 8 76 40 9 20 G youcan set G 20dB to use standard resistor values CO Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 40 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 O TIP environment consideration For hands free car kit microphone you must take into account the voice attenuation due to the distance between the microphone itself and the talker when designing the external microphone amplifier Not only you must consider that the microphone will pick up also ambient noise to overcome this problem it is preferable to set the gain of the microphone 10dB lower with respect to the calculated value for a nominal sensitivity The corresponding reduction in signal level will be compensated by an increased voice volume of the talker which will speak louder because of the ambient noise For a car cabin usually the distance between the microphone itself and the talker is 40 50cm in these conditions the attenuation can be consid
48. hould be powered with the PWRMON line otherwise the module functionality may be compromised It is important to consider that the added circuit must have consumption lower than 1mA 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 d Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 37 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 9 Audio Section Overview The Base Band Chip of the GE864 QUAD PY Telit Module provides two different audio blocks both in transmit Uplink and in receive Downlink direction MT lines should be used for handset function HF lines is suited for hands free function car kit These two blocks can be active only one at a time selectable by AXE hardware line or by AT command The audio characteristics are equivalent in transmit blocks but are different in the receive ones and this should be kept in mind when designing EXTERNAL AMPLIFIER ower Buffers E dg ES ul Diferential er 4 Differential Line Out Drivers Full Q O Ear_MT Ear_MT uiviooo orP S o x a 2 o 2 lt e Q 9 e x LL g 45dBV Pa Le K Reproduction forbidden without Telit Communications S p A written au
49. i R747 R720 4 i i 10K fy Ds j B dc Wei reu Re Ta ax ir a 0603 E m i ROSE 0603 1 A s 5 i C725 MEE m C720 R715 100nF PRRET 1 1 i00nF 47K iby 1 Eessen E iby OLOR te cece ee cece oe Baa F 15V e 0603 B03 0609 GNE GNG GND The above schematic can be used for a single ended buffered unbalanced microphone the required biasing circuitry is not included Note also that the capacitor C3 is not needed The gains of the two amplifiers are given by the formulas R719 R720 R711 R708 Gain not inverting buffer 1 Gain inverting buffer Assigning half of overall gain to each amplifier you will obtain the requested gain because of doubling the microphone signal path in fact by the use of two amplifiers the upper as inverting and the lower as not inverting configuration we obtain an additional 6dB gain 2 times Remember the not inverting amplifier section gain shall not be less than 1 Like for the balanced buffered microphone the amplifier overall gain can be modify changing the value of resistor R719 R720 and R711 and as a consequence the capacitors C726 and C727 It is advisable to change R708 only if you have difficulty to find a commercial value for R711 in this case change R708 as little as possible The 3dB bandwidth is given by the approximated formula considering C725 gt gt C726 lus C eos Reproduction forbidden without Telit Communications S p A writte
50. ing 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 CO Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 31 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 8 Serial Ports The serial port on the Telit GE864 QUAD PY is the core of the interface between the module and OEM hardware 2 serial ports are available on the module e MODEM SERIAL PORT e MODEM SERIAL PORT 2 DEBUG 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 2 8V 3V Universal Asynchronous Receive Transmit e microcontroller UART 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 GE864 QUAD PY 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 GE864 QUAD PY UART are the CMOS levels Absolute Maximum Ratings Not Functional Parameter Min Max Input level
51. 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 GE864 QUAD PY then this noise is not so disturbing and power supply layout design can be more forgiving The PCB traces to the GE864 QUAD PY 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 o
52. ion F4 G6 G7 H4 H7 J4 J6 J7 K9 L5 E5 L7 G5 G3 D7 C6 F8 C5 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 Internal PULL UP Type 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 J1 K1 J2 K2 A1 F1 H1 L1 H2 L2 J3 K3 L3 K4 K5 D6 K6 L6 A11 F11 L11 J5 E7 A2 H8 F7 signal VBATT GND ON OFF TXD RESET RXD RTS RTS should be connected to the GND on the module side if flow control is not used gic B Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 12 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 3 1 1 BGA Balls Layout TOP VIEW A B c D E F G H J K L 1 D PIO 19 PIO 0 PIO D CHARGE D BA BA D 2 RESET PIO 0 VRTC CHARGE BA BA 3 PIO 04 PIO 20 PIO 10 D D D 4 S PIO 14 SIMVCC PIO e D Antenna 5 F te VAUX1 PIO PIO D 6 D SC PIO 16 D 7 DAC_OUT PIO 18 E 8 I eom PIO m g PWRMON 9 2 gt PIO_09 SIMRST Ge 10 SIMCLK SIMIO RX_TRACE PIO PIO 11 D SIMIN TX_TRACE D ADC IN3 ADC IN2 ADC IN1 PIO_08 D Reproduction forbidden without Telit Communications S p A written authorization All Rights SZ page 13 of 77 Z e Telit GE864 Hardware
53. it scenario but you need to put microphone and speaker inside the same box e Try to have the maximum possible distance between them at least 7cm e Due to the fact the microphone type is very important if you use an omni directional one and this is the typical application please seal it on the rear side no back cavity in order not to collect unwanted signals e Try to make divergent the main axes of the two devices d Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 42 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 9 4 Microphone Biasing The electret microphones usually need a biasing voltage to work properly Refer to your microphone provider for the characteristics required Q NOTE The microphones have a hot wire were the positive biasing must be connected Us amp lly it is indicated by a symbol or a red point If the polarity of the bias is reversed then the microphone will not work properly For this reason be sure to respect the mic biasing polarity 9 4 1 Balanced Microphone Biasing The balanced microphone bias voltage should be obtained from a dedicated voltage regulator in order to eliminate the noise present on the power lines This regulator can be the same for all the audio paths The microphone should be supplied from a capacitor multiply circuit For example a circuit for the balanced microphone bia
54. l amplifier or directly a 16 Q earpiece at 12dBFS gt the Ear HF lines EPPA1 2 and EPPA2 are the Fully Differential Power Buffers they can directly drive a 160 speaker in differential balanced or single ended unbalanced operation mode FS acronym of Full Scale It is equal to OdB the maximum Hardware Analog Receive Gain of BaseBand Chip The Ear MT audio path should be used for handset function while the Ear HF audio path is suited for hands free function car kit Both receiver outputs are 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 needs ges ae Reproduction forbidden without Telit Communications S p A written authorization All Rights page of 77 10 2 Output Lines Characteristics Ear MT Differential Line out Drivers Path line coupling line type output load resistance internal output resistance signal bandwidth max differential output voltage differential output voltage SW volume level step number of SW volume steps Ear HF Power Buffers path line coupling line type output load resistance internal output resistance signal bandwidth max differential output voltage max single ended output voltage
55. llector transistor provided a 47KQ pull up resistor is connected as seen in the paragraph Error Reference source not found Error Reference source not found 11 2 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 output and therefore the pull up resistor may be omitted CO Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 59 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 11 3 Using the RFTXMON Output GPIO5 The GPIO5 pin when configured as RFTXMON Output is controlled by the GE864 QUAD PY 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 11 4 Using the Alarm Output GPIO6 The GPIO6 pad when configured as Alarm Output is controlled by the GE864 QUAD PY 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 GE864 QUAD PY 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 GE864 QUAD PY during sleep
56. mplifier background noise which may be audible during idle conditions is cut off A principle schematic may be Le la lo Re C3 EAR MTt T EAR MT vcc ea C1 A5 am rt fe GND GND EAR QUT HOOnF HMOOnF C2 al ges eos Reproduction forbidden without Telit Communications S p A written authorization All Rights mm page of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 The resulting gain and high pass cut can be obtained with the formula Gain He R2 1 req Hz freq y gasca L And an example of internal Ear amplifier could be INTERNAL EAR AMPLIFIER 12dB UB01 y LN4862M 1 1 1 i i i i hb a Sez ox on ss EE H TO SPEAKER 1 5 Le RS SA GIS Ke ug 5 i EI EAR CT vci SHUTDONN z st 1 a spass 2 zp 8 M FROM GE864 QUAD PY EAR CH vce BYPASS co 9 8 i ca21jce22 7 Joe m i 25 ER 1 JE4R MI 4GOnF 400nF Gi Gi i Cao2 i 15v 16v 400nF H 0503 0603 H hee 6801 SE pes Tu PL803 i Des 1815061 03F 1 0603 1 1 RB07 RBO6 e d 15 Dr Pe MUTE CONTROLLED 5 en d d nu Ve a ALWAYS ON osoa 0603 h cz e 1 D GND k 477 Zi i n H Some amplifier require a low impedan
57. n authorization All Rights Reserved page 48 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 1 1 freq Hz 22 R719 C726 22 R711 C727 The buffer bandwidth at 3dB shall be 4KHz Note that the biasing of the operational amplifier is given for the inverting amplifier by the series divider R714 R715 The 100nF capacitor C719 is needed to filter the noise that could be coupled to that divider For the not inverting operational amplifier the biasing is given by a different divider R715 R717 with the capacitor C720 and through a series resistor R718 of 470KQ TIP example of calculation Let s assume you have a microphone with a sensitivity of 45dBV Pa and you want to use it in 2nd differential microphone path Mic HF inputs in normal spoken conditions at acoustic pressure of 4 7dBPa As reported at page XX the electrical level output from the microphone will be MicLevel 45 4 7 49 7 dBV ms but we have to consider 20dB loss due to the higher distance from the mouth of the talker 50cm MicLevel 49 7 20 69 7 dBVins corresponding to MicVoltage 10 997 0 9 33 19 I 1 LI 1 In order to have a signal of 1 mV 4 at the Mic HF inputs as suggested at TIP environment consideration the buffer must have a gain G4 Mic HF MicVoltage 1 10 3 0 33 10 23 or 10 dB Keeping in mind that balancing the line will double
58. n authorization All Rights Reserved page 56 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 10 7 The Evaluation Kit for Telit Modules EVK2 10 7 1 Short Description Telit supplies the Evaluation Kit for Telit modules EVK2 to assist the designer to develop his own applications based on GE864 QUAD PY Telit module The EVK2 is formed by a mother board and a dedicated Telit module Interface Board with RF antenna connectors It provides a fully functional solution for a complete data phone application The motherboard has multiple power supply possibilities and is equipped with SIM card housing RS 232 serial port level translator direct USB1 1 connection and two audio input output paths The only items you have to provide are 1 a personal computer or microcontroller 2 a SIM card with a valid Network subscription 3 the audio accessories 4 a knowledge of AT commands programming 5 a power supply The connection between the EVK2 and your PC or other DTE are realized by standard RS232 or USB 1 1 ports The communications between your application and Telit Modules are realized connecting the Asynchronous Serial Interfaces of the modules Base Band Chips ASCO and ASC7 through gt a double stacked standard DB9 connector that provides 2 serial communication paths RS232 protocol up to 115Kbit sec gt a CMOS HUB that makes both serial interfaces accessible through one physical connecti
59. n 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 on 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 GE864 QUAD PY antenna line e Keep the antenna line far away from the GE864 QUAD PY power supply lines e f you have EM noisy devices around the PCB hosting the GE864 QUAD PY 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 GE864 QUAD PY by using a strip line on the superficial copper layer for the antenna line the line attenuation will be lower than a buried one page 28 of 77 rA e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 6 3 GSM Antenna Installation
60. nbalanced microphone biasing can be 4 3V MIC MIC Biasing Regulator E DE Capacity multiply carcuit EE U1 LPeS8HO0AIMSX 3 0 V 1N y OUT GND C1 sour ON OFF NCL 4v LOZA CONTB RA Mads GND fg Electret microphone p T 4 mMc E 1 4 i m Snielded i To Mic Buffer amplifier Cable Copes MIC i C3 2 i E d Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 44 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 NOTE In the unbalanced application the capacitor C3 shall be 200nF otherwise the frequency response will be cut at low band frequencies down to 300Hz This capacitor can be placed close to the MIC pad MIC HF or MIC MT depending on the audio path chosen or if possible it should be placed close to the shielded cable connector If the ground return path is well designed then it is possible to eliminate the C3 capacitor provided the buffer is close to the mic input NOTE The cable to the microphone should be shielded O NOTE The microphone changes with the value of R2 Usually the microphone sensitivity is characterized with 2kQ biasing resistance so try to keep the value of R2 around 2kQ For mic characteristics refer to the manufacturer page 45 of 77 Z e Telit GE864 Hardw
61. 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 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 71 of 77 12 3 8 GE864 Solder reflow Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 The following is the recommended solder reflow profile Temperature ts Preheat Critical Zone T to Tp t 25 C to Peak Time gt gt 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 5 C of actual Peak Temperature tp Ramp down Rate Time 25 C to Peak Temperature Pb Free Assembly 3 C second max 150 C 200 C 60 180 seconds 3 C second max equ 60 150 seconds 245 0 5 C 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 GE864 module can accept only one reflow process ae Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved a JS page 72 of 77 Ee e Telit GE864
62. on providing two way communication in compliance with USB version 1 1 specification The second one is the only possibility with portable personal computers that generally have not the RS232 port Furthermore the EVK2 allows to benefit of the special features of the new Telit Module versions with PYTHON Script Interpreter 1 e d fig i ur Z s T Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 57 of 77 The ASC1 port is used for 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 Continuous of debug messages of the PYTHON Script Interpreter requires PYTHON version modules 10 7 2 EVK2 Audio Lines Characteristics Low Power Audio1 Outputs Ear MI line line coupling line type load impedance signal bandwidth max output max differential output voltage Low Power Audio2 Outputs Ear_HF line line coupling line type load impedance signal bandwidth max single ended output voltage High Power Audio1 Audio2 Outputs line coupling line type load impedance signal bandwidth maximum power output THD N Reproduction forbidden without Telit Communica i i TL tions S p A written authorization All Rights Reserved AC single ended referred to GND 2160 150 4000 Hz 3 dB 655MV ms open circuit 164mV typ 16 Q 12dBFS AC single ended referred to GND 2160 150 4000
63. or damage of any kind incurred by use of or reliance upon the information Telit Communications S p A 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 Communications S p A reserves the right to make modifications additions and deletions to this document at any time and without notice 2006 2007 Telit Communications S p A li EU Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 6 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 1 Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE864 QUAD PY module In this document all the basic functions of a mobile phone will be taken into account for each one of them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced Obviously this document cannot embrace the whole hardware solutions and products that may be designed The wrong solutions to be avoided shall be considered as mandatory while the suggested hardware configurations shall not be considered mandatory instead the information given shall be used as a guide and
64. 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 GE864 QUAD PY e When using a switching regulator a 500kHz or more switching frequency regulator is preferable because of its smaller inductor size and its faster transient response This allows the regulator to respond quickly to the current peaks absorption 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 100yF 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 GE864 QUAD PY 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 it is split in 2 parts CO Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 21 of 77 P
65. p so the pin can be left floating if not used d d Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 18 of 77 p Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 o 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 GE864 QUAD PY power requirements are e Nominal Supply Voltage 3 8V e Max Supply Voltage 42V e Supply voltage range 34V 42V e Max Peak current consumption impulsive 1 5A e Max Average current consumption during GPRS transmission 370 mA e Max Average current consumption during VOICE CSD transmission 200 mA e Average current during Power Saving with CFUN 5 3mA e Average current during idle Power Saving disabled 22 mA 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 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
66. rential input voltage S 65mV 23MV ms e microphone nominal sensitivity 45 dBVms Pa analog gain suggested echo canceller type 10dB car kit hands free page 39 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 p TIP definition of the nominal sensitivity of the microphone lines The nominal sensitivity of the microphone lines indicates the voltage level on the GE864 QUAD PY pins present during normal spoken conditions For a handset the normal spoken conditions take place when the talker mouth is 7cm far from the microphone under these conditions the voice will produce an acoustic pressure of 4 7dBPa 1kHz on the microphone membrane p TIP electrical equivalent signal and operating voice levels At normal spoken conditions a microphone having the suggested nominal sensitivity of 45dBVms Pa will produce the electrical equivalent signal MicLevel 45 4 7 49 7 dByims that means s MicVoltage 10 97 3 3 10 Vins During a call this level varies according to the volume of the talker voice usually the following rough thumb rule for the dynamic range may be used 1 the talker is screaming This is the strongest voice level condition the signal increases by 20dB 2 the talker is whispering This is the lowest voice level condition the voice level decreases by 50dB These changes must be considered for designing the external microp
67. rpiece can be directly connected to the output pads EAR MIr and EAR MT of the GE864 QUAD PY This solution is often the more cost effective reducing the components count to a minimum There are several limitations to the use of this solution speaker direct connect imposes the speaker characteristics to be almost exactly the suggested ones otherwise the power output may be reduced if speaker impedance is bigger than 160 or the GE864 QUAD PY ear port may be damaged if speaker impedance is less than 150 The other limitation of the speaker direct connection is the power output capability of the GE864 QUAD PY which is limited and for some particular applications may not be enough For these reasons when the power output of the GE864 QUAD PY is not enough or if the speaker characteristics are different from the suggested then it is preferable to use an amplifier to increase the power and current output capabilities Again the output from the GE864 QUAD PY is bridged and both lines should be used where possible as inputs to the power amplifier This ensures a higher common mode rejection ratio reducing the GSM current busts noise on the speaker output In this case the EAR MT lines from the GE864 QUAD PY should be AC coupled with a ceramic capacitor of 100nF or bigger It is always desirable to have a mute control on the amplifier in order to turn it off while the device is not sending signal to the output in this manner the a
68. s Reserved page 3 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 9 3 Other considerations eerte reir nean npa kun ruga Yu ay RENE YE NR ER ERYRNERER KEEN FREE ERRERPEFEEKERYE FPE EFR LEER 42 T AME Wee oo M O 43 9 4 1 Balanced Microphone Biasing sss eene enne nennen nennen 43 9 4 2 Unbalanced Microphone BiaSing emere nennen nnne 44 35 MICFOPMONG Buffering o ii xe pD0 I exe LRpR IUD DIE CUERO a GAS eenaa 46 9 5 1 Buffered Balanced Mie 46 9 5 2 Buffered Unbalanced Single Ended Microphone cccccceeceeeeeeeeeeeeseeeeeseaeeseeeeeseeeessaeensnees 48 10 OUTPUT LINES Speaker xen a iaa aua aaa adag dada cancun a dada E UG UR 51 10 1 Short descripti me 51 10 2 Output Lines CharacteristlICs inrer see EES SE EE EES RRR RR XR RANA R ERE 52 10 3 General Design Rules nora ii cs uni REKRULR OR FR RE CR ED CR RR H uu E E EE EU RR RUNS 53 10 3 1 Noise Filtering nemen nennen nnnm nennen nennen nennen neret ener 53 10 4 Handset Earphone Desi axietxkna stadi iciaa ev3adARS GS RUE UMP Lb CKLOS Idl ds buo Dc inda apad Fb SM dO RE KE 54 10 5 Hands Free Earphone Low Power Design eee 55 10 6 Car Kit Speakerphone Design oe ricco reco onto eterne eeu NEE SE EEN ENEE soar UaEE 56 10 7 The Evaluation Kit for Telit Modules EVK2 sse 57 10 7 1 ee ugi nl e
69. sation This results in two benefits eliminating the background noise when not in conversation and saving power The power to the amplifier should be decoupled as much as possible from the GE864 QUAD PY power supply by either keeping separate wires and placing bypass capacitors of adequate value close to the amplifier power input pads The biasing voltage of the amplifier shall be stabilized with a low ESR e g a tantalum capacitor of adequate value NOTE The GE864 QUAD PY audio path connected to the car kit hands free amplifier MUST be Ear HF one otherwise the echo cancellation will not be done due to the difference in the echo canceller characteristics of the GE864 QUAD PY internal audio path from the external audio path Example of car kit amplifier schematic HIGH POWER EXT EAR AMPLIFIER IEN Suede e ecu leer i cles eL ecc E nM EE xml Ee Cu rn ver a H 5 EE i i zl m E4P HF4 i 1 T ES x C813 SEDES TO SPEAKER T Sep TT D BOHM IM Ee Lu as S Oe ne 4 in i ERSTES z JE P HF MODE Copa con Big 1 aoon opgoe 5 i ee Se E Sp EA 35v T PLOGd i d E d cai0 rang Dra g Se SE B MUTE CONTAOLLED i Bm mad a ALWAYS DN LUNT E Deos fig END SHO GND AMPLI POWER CONTROL CO Reproduction forbidden without Telit Communications S p A writte
70. sfree mic input phase nom level G8 MIC HF Al 3mVrms Audio Handsfree mic input phase nom level J9 MIC HF Al US Audio F9 AXE l Handsfree switching 100K CMOS 2 8V SIM card interface C10 SIMCLK Oo External SIM signal Clock 1 8 3V E9 SIMRST Oo External SIM signal Reset 1 8 3V D10 SIMIO I O External SIM signal Data I O 1 8 3V C11 SIMIN l External SIM signal Presence active low 47K 1 8 3V D4 SIMVCC External SIM signal Power supply for the SIM 1 8 3V Trace D11 TX TRACE Oo TX Data for debug monitor CMOS 2 8V F10 RX TRACE l RX Data for debug monitor CMOS 2 8V Prog Data HW Flow Control E7 C103 TXD l Serial data input TXD from DTE CMOS 2 8V H8 C104 RXD Oo Serial data output to DTE CMOS 2 8V B7 C108 DTR l GE for Data terminal ready signal DTR from CMOS 2 8V F7 C105 RTS l A for Request to send signal RTS from CMOS 2 8V F6 C106 CTS Oo Output for Clear to send signal CTS to DTE CMOS 2 8V D9 C409 DCD o GE for Data carrier detect signal DCD to CMOS 2 8V E11 C107 DSR O Output for Data set ready signal DSR to DTE CMOS 2 8V B6 C125 RING Oo Output for Ring indicator signal RI to DTE CMOS 2 8V On this line a maximum of 10nF bypass capacitor is allowed z Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 9 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 Ball Signal UO Function Internal
71. sing can be 3 By 3V MIC MIC Biasing Regulator Capacity multiply circuit H 1 H i T i i C1 i i Te L H l WW i i L i H Ww i GND H i i eee e ee ee ee ee ee ee ee ee e e e e e e e e e e e e e ee 4 H i Electret micropnone 1 RE SE SE E MICH C l i 1 d 1 i i To MIC Buffer amplifier i MEI a E 2 MIC CH Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 43 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 NOTE In the balanced application the resistors R2 and R3 must have the same value to keep the circuit balanced NOTE The cable to the microphone should not be shielded instead a twisted pair cable shall be used NOTE The microphone sensitivity changes with the value of R2 and R3 Usually the microphones are characterized with 2kO biasing resistance so try to keep the sum of R2 and R3 around 2kQ Refer to your microphone manufacturer for the mic characteristics 9 4 2 Unbalanced Microphone Biasing The unbalanced microphone biasing voltage should be obtained from a dedicated voltage regulator in order to eliminate the noise present on the power lines This regulator can be the same for all the audio paths The microphone should be supplied from a capacitor multiply circuit For example a circuit for the u
72. tandard one you can change R605 e R607 and as a consequence the capacitors C636 and C637 to maintain the bandwidth 150 4000Hz at 3dB ges B Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 46 of 77 Ee e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 The buffer gain is given by the formula R604 R606 Gain R605 R607 The C636 and C637 capacitors are placed in order to cut off the gain at higher frequencies than the transmitted GSM band the cutoff frequency 3dB should be 3500Hz in order to have 1dB at 3kHz The cutoff frequency is given by the formula 1 1 freq _____ IS 27 R604 C637 2r R606 C636 TIP example of calculation Let s assume you have a microphone with a sensitivity of 45 dBV m Pa and you want to use it in 1st differential microphone path Mic_MT inputs in normal spoken conditions at acoustic pressure of 4 7dBPa As reported at page 33 the electrical level output from the microphone will be MicLevel 45 4 7 49 7 dByrms corresponding to MicVoltage 10 721 A 3 10 Me When the talker is screaming we will have a signal of 330 MV mson the Mic MT inputs due to a 20dB higher Mic Level see TIP 1 with a buffer gain G4 G 20 log AmplifierOutput MicVoltage 20 log 330 10 33 10 20 log 10 20dB The corresponding val
73. ternal 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 VBATT R101 330 596 0603 LY M676 Q251 26 DL101 M676 UNS 10K Cu Cl STAT LED Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 62 of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 11 7 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 8 VAUX1 power output A regulated power supply output is provided in order to supply small devices from the module This output is active when the module is ON and goes OFF when the module is shut down The operating range characteristics of the supply are Operating Range VAUX1 power supply Min Typical Max Output voltage 2 75V 2 85V 2 95V Output current 100mA Output bypass capacitor 2 2uF page 63 of 77 APT Repro
74. the signal to calculate the resistor values assign half of required gain G4 to each amplifier section And therefore Gs 1 5times or 3 52dB Choosing as 10kQ as the input resistance the corresponding values for the resistors on the buffer will be R711 Gs R708 1 5 10 15 kQ R719 Gs 1 R720 1 5 1 10 5 kQ The commercial values of 15kQ and 5 6kQ be accepted e e Reproduction forbidden without Telit Communications S p A written authorization All Rights h page of 77 P d e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 As a consequence of the assigned values of the resistors the nominal values of C726 and C727 are C726 1 21 4000 R719 7 10 10 F C727 1 21 4000 R711 7 2 65 10 F modified in 6 8nF f 4181Hz and 2 7nF f 2 3931Hz because of commercial values Reproduction forbidden without Telit Communications S p A written authorization All Rights d page 50 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 10 OUTPUT LINES Speaker 10 1 Short description The Telit GE864 QUAD PY provides two audio paths in receive section Only one of the two paths can be active at a time selectable by AXE hardware line or by AT command You must keep in mind the different audio characteristics of the receive blocks when designing gt the Ear MT lines EPN1 and EPP1 are the Differential Line Out Drivers they can drive an externa
75. thorization All Rights page of 77 4 e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 9 1 Microphone Paths Characteristic and Requirements TIP being the microphone circuitry the more noise sensitive its design and layout must be done with particular care Both microphone paths are 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 TIP due to the difference in the echo canceller type the Mic MT audio path is suited for fb Handset applications while the Mic HF audio path is suited for hands free function car kit The Earphone applications should be made using the Mic HF audio path but DISABLING the echo canceller by software AT command If the echo canceller is left active with the Earphone then some echo might be introduced by the echo cancel algorithm Mic MT f differential microphone path line coupling AC e line type balanced e coupling capacitor 2 100nF e differential input resistance 50kQ e differential input voltage S 1 03V 365MV ims e microphone nominal sensitivity 45 dBV m Pa e analog gain suggested 20dB e echo canceller type handset Mic HF 2 differential microphone path e line coupling AC e line type balanced e coupling capacitor 2 100nF e differential input resistance 50kQ e diffe
76. thorization All Rights d page 74 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 13 Conformity Assessment Issues The GE864 QUAD PY module is 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 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 GE864 QUAD PY module is conform 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 GE864 QUAD PY 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 30
77. ues for the resistors on the buffer could be if we keep the input resistance 10kQ R604 R606 gain R607 gain R605 10 15 150 kQ The commercial values of 150kQ amp 15kQ are then chosen As a consequence the values of the capacitors C636 and C637 shall be C636 C637 1 21r 4000 R606 265 10 F A commercial value of 270pF gives a cutoff frequency of 3931Hz with an errorless than 1 8 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 47 of 77 Z e Telit GE864 Hardware User Guide 1vv0300694 Rev 7 08 02 07 9 5 2 Buffered Unbalanced Single Ended Microphone SINGLE ENDED MICROPHONE BUFFER 410 dB 33Y EXT MIG SINGLE iD HN EXT HIC SINGLE Tes n 3768 R714 4 DEIER 47K i GND 1 Di oer a U704 GE863 af TS3v91210 TCUE e Mic m nrag DECOUPLING CAPACITORS Og n va BEIER S be Ae Y EE ind E 2 m 4 2u O S EERS i C7419 R716 APE m MIC 550 1 1DDnF 47k ene iE xS dr SEN T i E Es 1 Hu BR TOMIC d pans osos E To 1 m 1 H E om s ERU huksi GE863 Mie PEGEEN oc jg f oi ESLAU i 1 GND BEND GNOD 1 434_EXT MIG SINGLE D e U701 GE GE863 SS TS8VB8121D SEET Mic 7 ua7 75 i I tay EXT MIC SINGLE S ad d i i OT II M i

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