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GE865 Hardware User Guide

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1. 12 2 2 Using ADC Converter ersinnen e Ts e aeaa ea Ule che d a eae si dedanotnctdcepeestuevaencaeevadecdeeectaceden eta deddnesadeasaneosteete 13 MOUNTING THE GE865 ON YOUR BOARD ccconococcnccccnnonnanananonononanananananonnnnnnnanananonononannnnnananonnnnnnnanananonencnnnananananenes 57 DSP UGENERAM css n 57 13 2 MODULE FINISHING amp DIMENSIONS ccessscccccesssssseececeseesssueeesceseeceeeeeseeeeeecesseeseeeseeeeseeesaseeeeeceseeaeseeaeeeeeseseesseeeeeeeseeesaaeees 57 13 3 RECOMMENDED FOOT PRINT FOR THE APPLICATION cccccccccceceseccceeeseeeeseeeseseeeeeeeeeeeeeeeeeeeeeeeeeeeeseeeseeeeeeeeseeeeeeeeeeeeeeeeseeeeeeeeenanes 58 13 4 DEBUG OF THE GE865 IN PRODUCTION ADS A a a a a aaaeei ea a Ea eaa aa e EASE 13 6 PCB PAD DESIGN 13 7 SOLDER P cC 1371 CIS oko SOIGER refl OW Em 14 PACKING SYSTEM 525525555252555255625655565546525562656556522650265265021655450216626c0s19spas5sl ssi so sies paso si ossi ous espe ossi o esos esos Posse pas 64 1A MS ToTg Td SET d 65 15 CONFORMITY ASSESSMENT ISSUES ee eeeeeeeeeeee esee eene n enhn nnn nnn nnn nn unu nu nu nni iniu niin ananunununu n inan nnn nnnnna 66 16 SAFETY RECOMMANDATIONS eeeeeeeeeeeee esee eene n nnn n nnn nnnnnnuunun
2. f 55 z Y m Y V at 3 Hs T fes ta 14 me iF LE wee e E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 7 of 7 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 1 5 Text Conventions Danger This information MUST be followed or catastrophic equipment failure or bodil injury may occur Caution or Warning Alerts the user to important points about integrating the module if these points are not followed the module and end user equipment may fail or malfunction Tip or Information Provides advice and suggestions that may be useful when i integrating the module All dates are in ISO 8601 format i e YYYY MM DD 1 6 Related Documents e Telit s GSM GPRS Family Software User Guide 1vv0300784 e Audio settings application note 80000NT10007a e Digital Voice Interface Application Note 80000NT10004a e GE865 Product description e SIM Holder Design Guides 80000NT10001a e AT Commands Reference Guide 80000ST10025a e Telit EVK2 User Guide 1vv0300704 Aerodicten forbidden without Telit Communications S p A written authorization All Rights Reserved page 8 of 8 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 1 7 Document History Revision ISSUE 0 ISSUE 1 ISSUE 2 ISSUE 3 ISSUE 4 ISSUE 5 ISSUE 6 ISSUE 7 ISSUE 8 ISSUE 9 ISSUE 10 H Reproduction for
3. 30A DO 21444 Tad2 RCR 110D 150 4 SWITCHING REGULATOR 6 3 1 3 Battery Source Power Supply Design Guidelines e The desired nominal output for the power supply is 3 8V and the maximum voltage allowed is 4 2V hence a single 3 7V Li lon cell battery type is suited for supplying the power to the Telit GE865 module page 27 of 27 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 WARNING The three cells Ni Cd or Ni MH 3 6 V Nom battery types or 4V PB types MUST NOT BE USED DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the GE865 and damage it NOTE DON T USE any Ni Cd Ni MH and Pb battery types directly connected with GE865 Their use can lead to overvoltage on the GE865 and damage it USE ONLY Li lon battery types e A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks a 100uF 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 GE865 from power polarity inversion Otherwise the battery connector should be done in a way to avoid polarity inversions when connecting the battery e The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A the suggested capacity is from 500mAh to 1000mAh gt Reprodu
4. Frequency range Panawidih 170 MHz in DCS amp 140 MHz PCS band Gain Gain lt 3dBi Impedance 500 Input power gt 2 W peak power VSWR absolute max lt 10 1 VSWR recommended lt 2 1 When using the GE865 since there s no antenna connector on the module the antenna must be connected to the GE865 through the PCB with the antenna pad BGA Ball H5 In the case that the antenna is not directly developed on the same PCB hence directly connected at the antenna pad of the GE865 then a PCB line is needed in order to connect with it or with its connector ee e s Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 31 of 31 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 This line of transmission shall fulfill the following requirements ANTENNA LINE ON PCB REQUIREMENTS Impedance 500 Max Attenuation 0 3 dB No coupling with other signals allowed Cold End Ground Plane of antenna shall be equipotential to the GE865 ground pins Furthermore if the device is developed for the US market and or Canada market it shall comply with the FCC and or IC approval requirements This device is to be used only for mobile and fixed application In order to re use the Telit FCC IC approvals the antenna s used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co located or operating in c
5. see following figure 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 Immersion Au 0 05 0 15 high shear force values The PCB must be able to resist the higher temperatures which are occurring at the lead free process This issue should be discussed with the PCB supplier Generally the wettability of tin lead solder paste on the described surface plating is better compared to lead free solder paste 13 7 Solder paste Lead free Solder paste Sn Ag Cu TR forbidden without Telit Communications S p A written authorization All Rights pee page 61 of 61 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 13 7 1 GE865 Solder reflow The following is the recommended solder reflow profile Le Critical Zone T to Tp T E ts Preheat Temperature 25 t 25 C to Peak gt i Time gt IPC O20b 5 1 Profile Feature Pb Free Assembly Average ramp up rate T to Tp 3 C second max Preheat Temperature Min Tsmin 150 Temperature Max Tsmax 200 Time min to max ts 60 180 seconds Tsmax to TL Ramp up Rate 3 C second max Time maintained above Temperature TL 2175 Time tL 60 150 seconds Peak Temperature Tp 245 0 5 C Time within 5
6. C of actual Peak 10 30 seconds Temperature tp Ramp down Rate 6 C second max Time 25 to Peak Temperature 8 minutes max ams C EET forbidden without Telit Communications S p A written authorization All Rights Reserved page 62 of 62 lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 NOTE All temperatures refer to topside of the package measured on the package body surface WARNING The GE865 module withstands one reflow process only page 63 of 63 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 14 Packing system The GE865 modules are packaged on trays of 50 pieces each This is especially suitable for the GE865 according to SMT processes for pick amp place movement requirements GE8x5 modules x50 Humidity indicator stripe UPPER SIDE Silica gel bag x2 1 E s LT See Pl mee z Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 64 of 64 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 NOTE All temperatures refer to topside of the package measured on the package body surface A WARNING These trays can withstand at the maximum temperature of 65 C 14 1 Moisture sensibility The level of moisture sensibility of GE865 is 3 in according wi
7. DCD dcd uart B5 Data Carrier Detect the carrier presence 2 eee A4 Transmit line see Note Output transmit line of GE865 UART 3 Gin A3 Receive line see Note Input receive of the GE865 UART i 1 Input to the GE865 that controls the 4 DTR dtr uart B3 Data Terminal Ready DTE READY condition C2 C7 E5 E7 G1 G3 5 GND G4 G5 H3 Ground ground H6 Output from the GE865 that indicates 6 DSR dsr_uart B2 Data Set Ready the module is ready Input to the GE865 that controls the 7 RTS rts_uart A1 Request to Send Elardware omo oniro Output from the GE865 that controls 8 CTS cts_uart A2 Clear to Send aria io contol 9 RI ri uart B4 Ring Indicator Output from the GE865 that indicates the incoming call condition NOTE According to V 24 RX TX signal names are referred to the application side therefore on the GE865 side these signal are on the opposite direction TXD on the application side will be connected to the receive line here named TXD rx_uart of the GE865 serial port and viceversa for RX NOTE For a minimum implementation only the TXD and RXD lines can be connected the other lines can be left open provided a software flow control is implemented ii ee e s Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 37 of 37 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 9 2 RS232 level translation fi i In or
8. E 15 5 HARDWARE COMMANDS m 16 5 1 TURNING ON THE GE865 5 2 TURNING OFF THE GE865 5 34RESETTING TBE GES GS risene vett ert hne eere va iaa 5 3 1 Hardware Unconditional restart eee eee hn h ananas hahahaha AEE VE AAEN a aas a sa sa saa asa saa 21 6 POWER SUPPLY f eii 23 6 1 POWER SUPPLY REQUIREMENTS cucvcoocinciana cid cuand cdacvcuucvaaesaspaccuanvseseducuddsuseas cacesavesaagvseeeddnu geapudan ei eo a eai oea oea anair 23 6 2 POWER CONSUMPTION iscsseisasitscsccncdachainetatalecduaaacsscscncdasssaQetescawacinelantedecteunaseagensecesassanlanus al sinaddsunddasesiernedan adsupuieanacangease sheen 24 6 3 GENERAL DESIGN RULES iia dad a 25 6 3 1 Electrical Design E 5 d tibt piane tne Po Ye aaa RVONS BERE EEE VOIE aude BARES RE RE ERR ERA TRE EERE 25 6 3 2 Thermal Design Guidelines ies rre tree he FIR Re ER ERA ed REIR FERE UR DENT REX ERA VE V ORE ERE EAR Rede REN EUR S ER cidade 29 6 3 3 Power Supply PCB layout Guidelines sees sss seeseeseee eese ennnnnn nnns n taa aas asses satia sas a s sss s asia dass nass s arsi a4 30 7 nuit EE p 31 7 1 GSM ANTENNA REQUIREMENTS eeee 7 2 GSM ANTENNA PCB LINE GUIDELINES 7 3 GSM ANTENNA INSTALLATION GUI
9. Refer to SW User Guide or AT Commands Reference Guide for the full description of this function Lem Aerodicten forbidden without Telit Communications S p A written authorization All Rights h page 56 of 56 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 13 Mounting the GE865 on your Board 13 1 General The GE865 modules have been designed in order to be compliant with a standard lead free SMT process 13 2 Module finishing amp dimensions d Pin A1 00006000 OOO o OOOO ooooloooo EN pa m EN ptm a SO o0 0 O00 O ERIS o Bae NS A Oo C o 9000 PER YY C Iw Qi Q O OOO o JOOO O olo O00 LI Reproduction for zu i bidden without Telit Communications S p A written authorization All Rights Reserved page 57 of 57 lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 13 3 Recommended foot print for the application 22 10 ANT TP 22 10 00000000 0000000N N 00000008 O 3 f 4 m O E In order to easily rework the GE865 is suggested to consider on the application a 1 5mm Inhibit area around the module It is also suggested as common rule for an SMT component to avoid having a mechanical part of the application in direct contact with the module O NOTE In the customer application the region under INHIBIT WIRING 1 see figure must be clear fro
10. a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced Obviously this document cannot embrace the whole hardware solutions and products that may be designed The wrong solutions to be avoided shall be considered as mandatory while the suggested hardware configurations shall not be considered mandatory instead the information given shall be used as a guide and a starting point for properly developing your product with the Telit GE865 module For further hardware details that may not be explained in this document refer to the Telit GE865 Product Description document where all the hardware information is reported NOTICE EN The integration of the GSM GPRS GE865 cellular module within user application shall be done according to the design rules described in this manual IT L integrazione del modulo cellulare GSM GPRS GE865 all interno dell applicazione dell utente dovr rispettare le indicazioni progettuali descritte in questo manuale DE Die Integration des GE865 GSM GPRS Mobilfunk Moduls in ein Ger t mu gem der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen SL Integracija GSM GPRS GE865 modula v uporabni ki aplikaciji bo morala upo tevati projektna navodila opisana v tem pirocniku SP La utilizaci n del modulo GSM GPRS GE865 debe ser conforme a los usos para los cuales ha sido dese ado descritos en este manual del usuario FR L
11. amp TTE Directive Furthermore the GE865 Module module is FCC Approved as module to be installed in other devices This device is to be used only for fixed and mobile applications If the final product after integration is intended for portable use a new application and FCC is required The GE865 Module is conforming to the following US Directives Use of RF Spectrum Standards FCC 47 Part 24 GSM 1900 EMC Electromagnetic Compatibility Standards FCC47 Part 15 This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation 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 H sh Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 66 of 66 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 The system antenna s used for this module must not exceed 1 4dBi 850MHz and 3 0dBi 1900MHz for mobile and fixed or mobile operating configurations Users and installers must be provided with antenna installation i
12. forbidden without Telit Communications S p A written authorization All Rights page 43 of 43 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 10 1 Electrical Characteristics must be done with particular care Both microphone paths are balanced and the OEM circuitry must be balanced designed to reduce the common mode noise typically generated on the ground plane However the customer can use the unbalanced circuitry for particular application TIP Being the microphone circuitry the more noise sensitive its design and layout 10 1 1 Input Lines Line Coupling AC Line Type Balanced Coupling capacitor 2 100nF Differential input resistance 50kQ Differential input voltage lt 1 03Vpp MicG 0dB WARNING AC means that the signals from the microphone have to be connected to input lines of the module through capacitors which value has to be gt 100nF Not respecting this constraint the input stages will be damaged e STOR WARNING when particular OEM application needs a Single Ended Input configuration it is forbidden connecting the unused input directly to Ground but only through a capacitor which value has to be gt 100nF Don t forget that in Single Ended configuration the useful input signal will be halved is C EET forbidden without Telit Communications S p A written authorization All Rights Reserved page 44 of 44 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2
13. 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 In any case the frequency and Switching design selection is related to the application to be developed due to the fact the switching frequency could also generate EMC interferences 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 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 For Car applications a spike protection diode should be inserted close to the power input in order to clean the supply from spikes e A protection diode should be inserted close to the power input in order to save the GE865 from power polarity inversion This can be the same diode as for spike protection Cond EET forbidden without Telit Communications S p A written authorization All Rights h page 26 of 26 lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 An example of switching regulator with 12V input is in the below schematic split in 2 parts E 5 TO e s SWITCHING R g 12V INPUT E a V IN
14. int gration du module cellulaire GSM GPRS GE865 dans l application de l utilisateur sera faite selon les r gles de conception d crites dans ce manuel HE mcr omo de pra HANA 0t 15022 newer mma ng a7 WPAN NOLIN EM OY GE865 QUAD The information presented in this document is believed to be accurate and reliable However no responsibility is assumed by Telit Communications S p A for its use nor any infringement of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent rights of Telit Communications S p A other than for circuitry embodied in Telit products This document is subject to change without notice page 10 of 10 lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 3 GE865 Mechanical Dimensions The GE865 overall dimensions are e Length 22 mm e Width 22 mm e Thickness 3 0 mm me A SCALE 1 A SECTION A A id 9 0009000 Q 000000 r eae K 2 gt 0000000 n S SEE DETAIL E Mo o0 l0 000 a p SEA bM Lo A B oooco oo0oO0 T 46000000 A Ooo 0 0 ooo T 4 i 0 05 z page 11 of 11 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 4 QGE865 module connections 4 1 PIN OUT Ball Signal 1 0 Function Note Type Audio E8 EAR AO Earphone signal output phase Audio D8 EAR AO Earphone signal output phase A
15. maximum current that can be drained from the ON pad is 0 1 mA A simple circuit to do it is ON Power ON impulse NS NOTE Don t use any pull up resistor on the ON line it is internally pulled up Using pull up resistor may bring to latch up problems on the GE865 power regulator and improper power on off of the module The line ON must be connected only in open collector configuration A EET forbidden without Telit Communications S p A written authorization All Rights Reserved page 16 of 16 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 NOTE In this document all the lines that are inverted hence have active low signals are labelled with a name that ends with or with a bar over the name TIP To check if the device has powered on the hardware line PWRMON should be monitored After 900ms the line raised up the device could be considered powered on NOTE It is mandatory to avoid sending data to the serial ports during the first 200mS of the module startup NOTE It is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE865 when the module is powered off Reproduction forbidden without Telit Communications S p A written authorization All Rights LA page 17 of 17 lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 A flow chart showing the proper turn on p
16. of the integrated output voltage 0 1023 10 bit precision it must be present if lt enable gt 1 Refer to SW User Guide or AT Commands Reference Guide for the full description of this function NOTE The DAC frequency is selected internally D A converter must not be used during POWERSAVING 12 1 3 Low Pass Filter Example R1 R2 R3 DAC OUT AAN ARA ANN 12k 12k 12k INPUT dac out OUTPUT C1 100nF C2 100nF C3 100nF GHD a 8 GND GND VGND GND GND 1 ll i 5 E S s N is Li 1 y 8 mt iF Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 55 of 55 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 12 2 ADC Converter 12 2 1 Description The on board A D are 11 bit converter They are able to read a voltage level in the range of 0 2 volts applied on the ADC pin input store and convert it into 11 bit word Min Max Units Input Voltage range 0 2 Volt AD conversion 11 bits Resolution 1 mV The GE865 module provides 2 Analog to Digital Converters The input lines are ADC IN1 available on Ball F5 and Pin 19 of PL102 on GE865 Interface Board CS1324 ADC IN2 available on Ball F6 and Pin 20 of PL102 on GE865 Interface Board CS1324 12 2 2 Using ADC Converter An AT command is available to use the ADC function The command is AT ADC 1 2 The read value is expressed in mV
17. page 6 of 6 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 1 4 Document Organization This document contains the following chapters Chapter 1 Introduction provides a scope for this document target audience contact and support information and text conventions Chapter 2 Overview provides an overview of the document Chapter 3 GE865 Mechanical Dimensions Chapter 4 GE865 Module Connections deals with the pin out configuration and layout Chapter 5 Hardware Commands How to operate on the module via hardware Chapter 6 Power supply Power supply requirements and general design rules Chapter 7 Antenna The antenna connection and board layout design are the most important parts in the full product design Chapter 8 Logic Level specifications Specific values adopted in the implementation of logic levels for this module Chapter 9 Serial ports The serial port on the Telit GE865 is the core of the interface between the module and OEM hardware Chapter 10 Audio Section overview Refers to the audio blocks of the Base Band Chip of the GE865 Telit Modules Chapter 11 General Purpose I O How the general purpose I O pads can be configured Chapter 12 DAC and ADC Section Deals with these two kind of converters Chapter 13 Mounting the GE865 on the application board Recommendations and specifics on how to mount the module on the user s board
18. with the pins because electrostatic discharges may damage the product itself Same cautions have to be taken for the SIM checking carefully the instruction for its use Do not insert or remove the SIM when the product is in power saving mode The system integrator is responsible of the functioning of the final product therefore care has to be taken to the external components of the module as well as of any project or installation issue because the risk of disturbing the GSM network or external devices or having impact on the security Should there be any doubt please refer to the technical documentation and the regulations in force Every module has to be equipped with a proper antenna with specific characteristics The antenna has to be installed with care in order to avoid any interference with other electronic devices and has to guarantee a minimum distance from the body 20 cm In case of this requirement cannot be satisfied the system integrator has to assess the final product against the SAR regulation P Eds Cua n without Telit Communications S p A written authorization All Rights Reserved page 68 of 68 Reproduction forbidde lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 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 ent
19. 009 10 1 2 Output Lines o TIP We suggest driving the load differentially thus the output swing will double and the need for the big output coupling capacitor avoided However if particular OEM application needs also a Single Ended S E circuitry can be implemented but the output power will be reduced four times The OEM circuitry shall be designed to reduce the common mode noise typically generated on the ground plane getting the maximum power output from the device low resistance tracks WARNING When in Single Ended configuration the unused output line must be left open if this constraint is not respected the output stage will be damaged EAR MT Output Lines line coupling single ended AC differential DC output load resistance 2140 internal output resistance 4 Q typical signal bandwidth 150 4000 Hz e 3dB max differential output voltage 1 31 Vms typical open circuit differential output voltage 328MV ms 16 Q 12aBFS volume increment 2 dB per step volume steps 10 OdBFS is the normalized overall Analog Gain equal to 3 7V p differential A a precuela forbidden without Telit Communications S p A written authorization All Rights Reserved page 45 of 45 lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 11 General Purpose I O The general purpose I O pads can be configured to act in three different ways input output alternate function intern
20. 300799 Rev 10 22 09 2009 Ball Signal 1 0 Function Note Type E2 PWRMON O Power ON Monitor CMOS 2 8V H5 Antenna O Antenna output 50 Q RF Service pin shall be used to upgrade the module from ASC1 RXD AUX TXD AUX The pin shall be tied low to enable the feature only in case of a SW Update activity It is ONOS ZEN required for debug purpose to be connected to a test pad on the final application GPIO GPIO01 Configurable GPIO Digital Audio H1 Service D3 GPIO_01 DVILWAO I O Interface WAO CMOS 2 8V Bee ovos zav E4 GPIO_03 DVI_TX 1 0 GPIO03 GPIO I O HH Audio Interface CMOS 2 8V H7 GPIO_04 TX_DISAB I O GPIO04 Configurable GPIO TX Disable input CMOS 2 8V G2 GPIO 05 RFTXMON 1 0 GPIOO05 S dE Transmitter ON CMOS 2 8V H8 GPIO 06 ALARM VO GPIOO6 Configurable GPIO ALARM CMOS 2 8V G6 GPIO 07 BUZZER VO GPIOO7 Configurable GPIO Buzzer CMOS 2 8V D4 GPIO_08 DVI_CLK 1 0 GRIDO a a ee CMOS 2 8V F4 GPIO_09 VO GPIO09 4 7 K Pull Up Open Drain E3 GPIO_10 VO GPIO10 4 7 K Pull Up Open Drain Power Supply F1 VBATT Main power supply Baseband Power F2 VBATT PA Main power supply Radio PA Power F3 VBATT PA Main power supply Radio PA Power G1 GND Ground Power C2 GND Ground Power C7 GND Ground Power E5 GND Ground Power E7 GND Ground Power G5 GND Ground Power G4 GND Ground Power G3 GND Ground Power H3 GND Ground Power H6 GND Ground Power RESERVED B6 C3 C4 C5 C6 D5 D6 D7
21. 5 inputs will work at 3 8V interface levels damaging the module inputs Pip Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 38 of 38 lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 An example of level translation circuitry of this kind is Vin A i C570 1uF a E cn 4i 0 1uF LE C27 0 1uF O 4uF RS232 Outputs from Module RS232 Outputs d y MAE Y RS232 Inputs 20 to Module 4 ko RS232 Inputs 418 OUT lt Vin 5 Lean gt _ 13 ONLINE Logic Level Select The example is done with a SIPEX SP3282EB RS232 Transceiver that could accept supply voltages lower than 3V DC NOTE In this case Vin has to be set with a value compatible with the logic levels of the module Max 2 9V DC In this configuration the SP3282EB will adhere to EIA TIA 562 voltage levels instead of RS232 5 5V D t i 4 EnA i H P 14 x EU y Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 39 of 39 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 Second solution could be done using a MAXIM transceiver MAX218 In this case the compliance with RS232 5V is possible am T 2 84 5 Pa ON OFF MODULE RS232 MODULE RS232 ENABLE Another level adapting method could be done using a standard RS232 Transceiver
22. 9 8 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 GE865 interface circuits Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any digital pin 0 3V 3 1V CMOS 2 8 when on Input level on any digital pin 0 3V 42 1V CMOS 1 8 when on Input voltage on analog pins 0 3V 3 0V when on Operating Range Interface levels 2 8V CMOS Level Min Max Input high level 2 1V 3 0V Input low level OV 0 5V Output high level 2 2V 3 0V Output low level oV 0 35V For 1 8V signals Operating Range Interface levels 1 8V CMOS Level Min Max Input high level 1 6V 2 0V Input low level OV 0 4V Output high level 1 65V 2 0V Output low level OV 0 35V Current characteristics Level Typical Output Current 1mA Input Current 1uA wee 3 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 34 of 34 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 8 1 Reset signal Signal Function 1 0 Bga Ball RESET Phone reset C1 RESET is used to reset the GE865 Whenever this signal is pulled low the GE865 is reset When the device is reset it stops any operation After the release of the reset GE865 is unconditionally shut down without doing any detach operation from the netwo
23. DELINES eee eene nnns nnns siis sa asas eese s essa a ese se esses saa ataa nandana aiai 33 8 LOGIC LEVEL SPECIFICATIONS 5 e iae roa ra aea aua rao ea eo ge eaae Eae ee dare aua nido reune cage deae Eae a dave Gua issver dossa suisses ossei 34 miU ML 35 9 IpiMuenjc 36 93 MODEMESERIAL POR Toa A asada 36 9 2 IRS23 25 EVEL TRANSLATION voices ii a es dc 38 9 3 5V UART LEVEL TRANSLATIONS ciccaassiisescccceicessteasvastocarchedaceecscobadasssasoeeddavheaneesuaccbaestaasngsecuadgaes dude sdaasiedansnd bibaeaueeaneeimecoaddeaanseds 41 10 AUDIO SECTION OVERVIEW scscasicscicteccccccccecevecicciecccasccveccbuccuecicascuiesiccseascascebecsaudcnecatauevassiscevencdvcebeiceuicnseascdevusssceusenss 43 10 1 ELECTRICAL CHARACTERISTICS 5 y o eas 4 ee n without Telit Communications S p A written authorization All Rights Reserved page 4 of 4 i mea p d Reproduction forbidde lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 10 12 QUEDUELINGS RN 45 11 GENERAL PURPOSE I O 46 TAL WGP IO LOGIC MEVEUS E TIZ USINGA GPIO PADAS INPUT siascsciscendssiheescic adaevaaziageccagencaaagaiscaasisdnedianceuceguastsiaeibeassnsinaedads dadeads w scuedssaiaan
24. E6 page 13 of 13 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 Ball Signal 1 0 Function Note Type F7 F8 A WARNING Reserved pins must not be connected NOTE If not used almost all pins should be left disconnected The only exceptions are the following pins pin signal F1 F2 F3 VBATT amp VBATT_PA G1 C2 C7 E5 E7 G5 G4 G3 H3 H6 GND B1 ON OFF A3 TXD C1 RESET A4 RXD A1 RTS D1 TXD_AUX E1 RXD_AUX H1 Service el KO EET forbidden without Telit Communications S p A written authorization All Rights A rea page 14 of 14 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 4 1 1 BGA Balls Layout TOP VIEW SIMCLK SIMVCC SIMRST LEGENDA POWER SUPPLY GND RESERVED NOTE The pin defined as H4 has to be considered RESERVED and not connected on any pin in the application The related area on the application has to be kept empty Fr nS C precuela forbidden without Telit Communications S p A written authorization All Rights Reserved page 15 of 15 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 5 Hardware Commands 5 1 Turning ON the GE865 To turn on the GE865 the pad ON must be tied low for at least 1 second and then released When the power supply voltage is lower than 3 4V the pad ON must be tied low at least 3 seconds The
25. HL e i leli wireless solutions GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 Making machines talk lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 APPLICABILITY TABLE PRODUCT e i a 24 n np at e ge i Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 2 of 2 a lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 DISCLAIMER The information contained in this document is the proprietary information of Telit Communications S p A and its affiliates TELIT The contents are confidential and any disclosure to persons other than the officers employees agents or subcontractors of the owner or licensee of this document without the prior written consent of Telit is strictly prohibited Telit makes every effort to ensure the quality of the information it makes available Notwithstanding the foregoing Telit does not make any warranty as to the information contained herein and does not accept any liability for any injury loss or damage of any kind incurred by use of or reliance upon the information Telit disclaims any and all responsibility for the application of the devices characterized in this document and notes that the application of the device must comply with the safety standards of the applicable country and where applicable with the relevant wiring rules Telit rese
26. MAX3237EAI adding some resistors to adapt the levels on the GE865 Input lines NOTE In this case has to be taken in account the length of the lines on the application to avoid problems in case of High speed rates on RS232 The RS232 serial port lines are usually connected to a DB9 connector with the following layout DCD Rs232 e DSR RS232 5 a C RX R5232 lt 7 n RTS RS2324 TX AS232 fi CTS RS232 5 DTR AS232 lt la RI_RS292e CL li tar 1 1 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 40 of 40 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 9 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 42 8V TXD 5V ial TXD 2 8V GND To TELIT To OEM HARDWARE ot RXD 95V RXD 2 8V TC7S207AFE GND TIP Note that the TC7SZO7AE has open drain output therefore the resistor R2 is mandatory NOTE The UART input line TXD rx uart of the GE865 is NOT internally pulled up with a resistor so there may be the need to place an exte
27. al SIM Holder Implementation Please refer to the related User Guide SIM Holder Design Guides 80000NT10001a Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 53 of 53 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 12 DAC and ADC section 12 1 DAC Converter 12 1 1 Description The GE865 provides a Digital to Analog Converter The signal named DAC OUT is available on BGA Ball G7 of the GE865 and on pin 17 of PL102 on GE865 Interface Board CS1324 The on board DAC is a 10 bit converter able to generate a analogue value based a specific input in the range from O up to 1023 However an external low pass filter is necessary Min Max Units Voltage range filtered 0 2 6 Volt Range 0 1023 Steps The precision is 10 bits so if we consider that the maximum voltage is 2V the integrated voltage could be calculated with the following formula Integrated output voltage 2 value 1023 DAC OUT line must be integrated for example with a low band pass filter in order to obtain an analog voltage Lem EET forbidden without Telit Communications S p A written authorization All Rights h page 54 of 54 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 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
28. ally controlled Input pads can only be read they report the digital value high or low present on the pad at the read time Output pads can only be written or queried and set the value of the pad output An alternate function pad is internally controlled by the GE865 firmware and acts depending on the function implemented For Logic levels please refer to chapter 8 The following table shows the available GPIO on the GE865 1 0 Type Input Default ON_OFF State output State state during current Reset GPIO_01 W O GPIOO1 Configurable GPIO CMOS 2 8V tuA tmA INPUT 0 GPIO 02 I O GPIO02 Configurable GPIO CMOS 2 8V 1uA imA INPUT 0 0 On JDR GPIO_03 I O GPIO03 Configurable GPIO CMOS 2 8V 1uA 1mA INPUT 0 0 Alternate function GPIO 04 l O GPIO04 Configurable GPIO CMOS 2 8V 1uA 1mA INPUT 0 0 RF Transmission Control 7 Alternate function GPIO_05 I O GPIO05 Configurable GPIO CMOS 2 8V 1uA imA INPUT 0 0 RETXMON GPIO 06 I O GPIO06 Configurable GPIO CMOS 2 8V 1uA imA INPUT 0 0 go Ee J Alternate function GPIO 07 I O GPIOO7 Configurable GPIO CMOS 2 8V 1uA 4mA INPUT 0 0 BUZZER GPIO 08 l O GPIOO8 Configurable GPIO CMOS 2 8V 1uA imA INPUT 0 0 GPIO 09 l O GPIOO09 Configurable GPIO CMOS 2 8V 1 1 1 Open Drain GPIO 10 lO GPIO10 Configurable GPIO CMOS 2 8V 1 1 1 Open Drain Not all GPIO pads support all these three modes e GPIO2 supports all three modes and can be input output Jamming Detect Output Alternate function e GPIO4 support
29. be placed close to the inductor to cut the ripple provided the PCB trace from the capacitor to the GE865 is wide enough to ensure a dropless connection even during the 2A current peaks e The protection diode must be placed close to the input connector where the power source is drained e The PCB traces from the input connector to the power regulator IC must be wide enough to ensure no voltage drops occur when the 2A current peaks are absorbed Note that this is not made in order to save power loss but especially to avoid the voltage drops on the power line at the current peaks frequency of 216 Hz that will reflect on all the components connected to that supply introducing the noise floor at the burst base frequency For this reason while a voltage drop of 300 400 mV may be acceptable from the power loss point of view the same voltage drop may not be acceptable from the noise point of view If your application doesn t have audio interface but only uses the data feature of the Telit GE865 then this noise is not so disturbing and power supply layout design can be more forgiving e The PCB traces to the GE865 and the Bypass capacitor must be wide enough to ensure no significant voltage drops occur when the 2A current peaks are absorbed This is for the same reason as previous point Try to keep this trace as short as possible e The PCB traces connecting the Switching output to the inductor and the switching diode must be kept as short as possible by p
30. bidde Date 2009 01 26 2009 02 15 2009 02 15 2009 03 18 2009 04 02 03 06 2009 04 06 2009 2009 05 26 2009 06 18 2009 07 27 2009 09 22 Changes First ISSUE 0 DRAFT Updated current consumptions table Updated Pinout description Updated mechanical dimensions balls spacing charger description removed Added better explanation of pin H5 RF and H1 service Updated VBATT supply Range DAC schematic Conformity assessment Updated section 13 FCC Conformity assessment Updated section 13 FCC Conformity assessment Applied new layout minor editing Edited PCB pad design par 13 1 6 Updated all schematic drawings Updated Chapter 10 Audio Section Substituted GE865 QUAD with GE865 Corrected GE864 QUAD PY with GE865 Updated Overview section Changed par 5 1 Turning ON and par 6 1 Power supply Requirements Changed par 13 3 and par 15 Conformity Assessment Issues Added DVI pins description Updated table of power consumptions Added note on chapters 5 1 5 2 9 3 Corrected chapter 1 1 n without Telit Communications S p A written authorization All Rights Reserved page 9 of 9 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 2 Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE865 module In this document all the basic functions of a mobile phone will be taken into account for each one of them
31. ceasecabweaiageteaccadses 11 3 UsINGA GPIO PAD AS OUTPUT 1c eoo as a dis 11 4 USING THE RF TRANSMISSION CONTROL GPIO4 11 5 USING THE RFTXMON OurPur GPIO5 11 6 USING THE ALARM OUTPUT GPIOSG 11 7 USING THE BUZZER OUTPUT GPIQ7 1 erre etie ee eu een enu ue ane Seer eR e FR Ya a Eo sega e dde Ea dua eade ar a RI RE aa va dh 11 8 MAGNETIC BUZZER eol ddake T 118 1 Short Descrip tION um 118 2 Freguency BehavioUF ite a EE AE e RE EERE 11 8 3 Power Supply Influence cscccccccceesssscsccccesesessseseeeceeseaeeeeeseseeesseeseeseeseeeessssaseceseesasssescesseeesaseaescecseuauasaesseeeeseeegaa 11 8 4 Working Current Influence esie seeese essen esee rn sen nn nn nan RR RR noni a RR RR NENEN RR AT ansa sesta ERNEK iia ERNE seni n as 11 9 INDICATION OF NETWORK SERVICE AVAILABILITY csessscccccsesesssseecceseeessaeeecceseesceesaseeeeceseeesaseeeeceeceesuseeeeceseeaaseeeeseeeeeseeseaaaes 11 10 EO T Coo Ue 11 11 EXTERNAL SIM HOLDER IMPLEMENTATION cccesssssscecccecscessseeecceseesessseesceeseesseessseeecesceessaaeeeeceseceessaeeeeeeceessaaeasaeseeeeseesaaaes 12 DAC AND ADC SECTION m 54 12 DAG CONVERTER teo 12 1 1 Description 12 1 2 Enabling DAC 12 1 3 Low Pass Filter Example PZ ADE CONVERTER Mirina a a eae uate vcsun tutu UE LI LM EL MOLDE I Ld reU T 1221 DESC c EE
32. ction forbidden without Telit Communications S p A written authorization All Rights Reserved page 28 of 28 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 6 3 2 Thermal Design Guidelines la The thermal design for the power supply heat sink should be done with the following specifications Average current consumption during transmission max PWR level 500mA Average current consumption during transmission min PWR level 100mA Average current during Power Saving CFUN 5 2 4mA Average current during idle Power Saving disabled 24mA NOTE The average consumption during transmissions depends on the power level at which the device is requested to transmit by the network The average current consumption hence varies significantly gt Ti A 1 cay f i TS pas Y ee e s Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 29 of 29 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 th
33. der to interface the GE865 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 2 8V to 15 15V Actually the RS232 UART 16450 16550 16650 8 16750 chipsets accept signals with lower levels on the RS232 side EIA TIA 562 allowing a lower voltage multiplying ratio on the level translator Note that the negative signal voltage must be less than OV and hence some sort of level translation is always required The simplest way to translate the levels and invert the signal is by using a single chip level translator There are a multitude of them differing in the number of drivers and receivers and in the levels be sure to get a true RS232 level translator not a RS485 or other standards By convention the driver is the level translator from the 0 2 8V UART to the RS232 level The receiver is the translator from the RS232 level to 0 2 8V UART In order to translate the whole set of control lines of the UART you will need e 5 drivers e 3 receivers NOTE The digital input lines working at 2 8V CMOS have an absolute maximum input voltage of 3 0V therefore the level translator IC shall not be powered by the 3 8V supply of the module Instead it must be powered from a 2 7V 2 9V dedicated power supply This is because in this way the level translator IC outputs on the module side i e GE86
34. e Battery 6 3 1 1 5V input Source Power Supply Design Guidelines 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 When using a linear regulator a proper heat sink shall be provided in order to dissipate the power generated A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks close to the GE865 a 100pF tantalum capacitor is usually suited Make sure the low ESR capacitor on the power supply output usually a tantalum one is rated at least 10V A protection diode should be inserted close to the power input in order to save the GE865 from power polarity inversion page 25 of 25 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 An example of linear regulator with 5V input is Svinow Linear Requiscor 6 3 1 2 12V input Source Power Supply Design Guidelines e The desired output for the power supply is 3 8V hence due to the big difference between the input source and the desired output a linear regulator is not suited and shall not be used A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by the GE865 e When using a switching regulator a 500kHz or more switching
35. e calculated one for 500mA maximum RMS current or even could be the simple chip package no heat sink Moreover in the average network conditions the device is requested to transmit at a lower power level than the maximum and hence the current consumption will be less than the 500mA being usually around 150mA For these reasons the thermal design is rarely a concern and the simple ground plane where the power supply chip is placed can be enough to ensure a good thermal condition and avoid overheating For the heat generated by the GE865 you can consider it to be during transmission 1W max during CSD VOICE calls and 2W max during class10 GPRS upload This generated heat will be mostly conducted to the ground plane under the GE865 you must ensure that your application can dissipate it lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 6 3 3 Power Supply PCB layout Guidelines As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the output to cut the current peaks and a 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 e The Bypass low ESR capacitor must be placed close to the Telit GE865 power input pads or in the case the power supply is a switching type it can
36. e module e MODEM SERIAL PORT 1 MAIN e MODEM SERIAL PORT 2 AUX 9 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 9 5V or other voltages different from 2 8V Depending from the type of serial port on the OEM hardware a level translator circuit may be needed to make the system work The only configuration that doesn t need a level translation is the 2 8V UART The serial port on the GE865 is a 2 8V UART with all the 7 RS232 signals It differs from the PC RS232 in the signal polarity RS232 is reversed and levels The levels for the GE865 UART are the CMOS levels Absolute Maximum Ratings Not Functional Parameter Min Max Input level on any 0 3V 3 1V digital pad when on Input voltage on 0 3V 3 1V analog pads when on Operating Range Interface levels 2 8V CMOS Level Min Max Input high level Vi 2 1V 3 0V Input low level Vi OV 0 5V Output high level Von 2 2V 3 0V Output low level Vo OV 0 35V 6 Aerodicten forbidden without Telit Communications S p A written authorization All Rights h page 36 of 36 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 The signals of the GE865 serial port are RS232 Signal GE865 Name Usage Pin Pad Number Number Output from the GE865 that indicates 1
37. ent NOTE Overshoot voltage regarding MAX Extended Operating Voltage and drop in voltage regarding MIN Extended Operating Voltage MUST never be exceeded The Extended Operating Voltage Range can be used only with completely assumption and application of the HW User guide suggestions NOTE When the power supply voltage is lower than 3 4V to turn ON the module the pad ON must be tied low for at least 3 seconds See para 5 1 A Ea EET forbidden without Telit Communications S p A written authorization All Rights Reserved page 23 of 23 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 6 2 Power Consumption The GE865 power consumptions are Average Mode mA Mode description Switched SWITCHED Module supplied but Switched Off IDLE mode AT CFUN 1 19 0 Normal mode full functionality of the module AT CFUN 4 18 0 Disabled TX and RX module is not registered on the network 3 9 Paging Multiframe 2 2 9 Paging Multiframe 4 AINE PEND er es 2 1 Paging Multiframe 6 1 9 Paging Multiframe 8 1 6 Paging Multiframe 9 CSD TX and RX mode GSM900 CSD PL5 305 0 GSM VOICE CALL DCS1800 CSD PLO 208 0 GPRS class 10 1TX GSM900 PL5 264 0 GPRS Sending data mode DCS1800 PLO 176 0 GPRS class 10 2TX GSM900 PL5 473 8 GPRS Sending data mode DCS1800 PLO 307 8 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 abo
38. erprise 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 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 69 of 69
39. eserved page 47 of 47 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 11 2 Using a GPIO Pad as INPUT The GPIO pads when used as inputs can be connected to a digital output of another device and report its status provided this device has interface levels compatible with the 2 8V CMOS levels of the GPIO If the digital output of the device to be connected with the GPIO input pad has interface levels different from the 2 8V CMOS then it can be buffered with an open collector transistor with a 47K pull up to 2 8V 11 3 Using a GPIO Pad as OUTPUT The GPIO pads when used as outputs can drive 2 8V CMOS digital devices or compatible hardware When set as outputs the pads have a push pull output and therefore the pull up resistor may be omitted 11 4 Using the RF Transmission Control GPIO4 The GPIO4 pin when configured as RF Transmission Control Input permits to disable the Transmitter when the GPIO is set to Low by the application In the design is necessary to add a pull up resistor 47K to 2 8V 11 5 Using the RFTXMON Output GPIO5 The GPIO5 pin when configured as RFTXMON Output is controlled by the GE865 module and will rise when the transmitter is active and fall after the transmitter activity is completed For example if a call is started the line will be HIGH during all the conversation and it will be again LOW after hanged up The line rises up 300ms before first TX burst and will became again LOW f
40. lacing the inductor and the diode very close to the power switching IC only for switching power supply This is done in order to reduce the radiated field noise at the switching frequency 100 500 kHz usually The use of a good common ground plane is suggested The placement of the power supply on the board should be done in such a way to guarantee that the high current return paths in the ground plane are not overlapped to any noise sensitive circuitry as the microphone amplifier buffer or earphone amplifier e The power supply input cables should be kept separate from noise sensitive lines such as microphone earphone cables Aerodicten forbidden without Telit Communications S p A written authorization All Rights Reserved page 30 of 30 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 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 7 1 GSM Antenna Requirements As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE865 device shall fulfil the following requirements ANTENNA REQUIREMENTS Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s 70 MHz in GSM850 80 MHz in GSM900
41. llowing flow chart shows the proper turnoff procedure N Delay 1 5s TIP To check if the device has been powered off the hardware line PWRMON must be monitored The device is powered off when PWRMON goes low It is recommended to avoid having HIGH logic levels applied to the digital pins during the ON OFF transitions and when the module is switched off icona E EET forbidden without Telit Communications S p A written authorization All Rights h page 20 of 20 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 5 3 Resetting the GE865 5 3 1 Hardware Unconditional restart STOP WARNING The hardware unconditional Restart must not be used during normal operation of the device since it does not detach the device from the network It shall be kept as an emergency exit procedure to be done in the rare case that the device gets stacked waiting for some network or SIM responses To unconditionally reboot the GE865 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 NOTE Do not use any pull up resistor on the RESET line nor any totem pole digital output Using pull up resistor may bring to latch up problems on the GE865 power regulator and improper functioning of the module The line RESET must be connected only in open collector configuration TIP The unconditional hardware resta
42. m signal or ground paths a M iu a Pp 35 pm Y PEY con ti Reproduction forbidden without Telit Communications S p A written authorization All Rights Res page 58 of 58 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 13 4 Debug of the GE865 in production To test and debug the mounting of the GE865 we strongly recommend to foreseen test pads on the host PCB in order to check the connection between the GE865 itself and the application and to test the performance of the module connecting it with an external computer Depending by the customer application these pads include but are not limited to the following signals e TXD e RXD e ON OFF e RESET e GND e VBATT e TX_AUX e RX_AUX e PWRMON e SERVICE 13 5 Stencil Stencil s apertures layout can be the same of the recommended footprint 1 1 we suggest a thickness of stencil foil 2 120um wireless solutions GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 13 6 PCB pad design Non solder mask defined NSMD type is recommended for the solder pads on the PCB Recommendations for PCB pad dimensions Ball pitch mm 2 4 Solder resist opening diameter A mm 1 150 Metal pad diameter B mm 1 0 05 page 60 of 60 wireless solutions GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 It is recommended no microvia without solder resist cover under the module and no microvia around the pads
43. ns S p A written authorization All Rights Reserved page 49 of 49 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 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 11 8 Magnetic Buzzer Concepts 11 8 1 Short Description A magnetic Buzzer is a sound generating device with a coil located in the magnetic circuit consisting of a permanent magnet an iron core a high permeable metal disk and a vibrating diaphragm A Diaphragm W hen a direct current is applied Drawing of the Magnetic Buzzer The disk and diaphragm are attracted to the core by the magnetic field When an oscillating signal is moved through the coil it produces a fluctuating magnetic field which vibrates the diaphragm at a frequency of the drive signal Thus the sound is produced relative to the frequency applied Input Signal Vibration Shape of Resonator T H s di D ic i y a P ES E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 50 of 50 i mE lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 11 8 2 Frequency Behaviour The frequency behaviour represents the effectiveness of the reproduction of the applied signals Because performance is related to a square driving waveform whose amplitude varies from OV to Vp
44. ns S p A written authorization All Rights Reserved page 51 of 51 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 11 9 Indication of network service availability The STAT LED pin status shows information on the network service availability and Call status In the GE865 modules the STAT LED usually needs an external transistor to drive an external LED Therefore the status indicated in the following table is reversed with respect to the pin status LED status Device Status Permanently off Device off Fast blinking Net search Not registered Period 1s Ton 0 5s turning off Slow blinking Period 3s Ton 0 3s Registered full service Permanently on a call is active A schematic example could be VBATT R101 330 5 0603 i DL101 LY M amp amp Q25 1 26 lt STAT LED f he i Qai s Xa r wee 1 a b Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 52 of 52 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 11 10 RTC Bypass out The VRTC pin brings out the Real Time Clock supply which is separate from the rest of the digital part allowing having only RTC going on when all the other parts of the device are off 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 11 Extern
45. nstructions 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 a U i Li e Reproduction forbidde n without Telit Communications S p A written authorization All Rights Reserved i page 67 of 67 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 16 SAFETY RECOMMANDATIONS READ CAREFULLY Be sure the use of this product is allowed in the country and in the environment required The use of this product may be dangerous and has to be avoided in the following areas Q Where it can interfere with other electronic devices in environments such as hospitals airports aircrafts etc U 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
46. nunihhui ni nun nana n cnn ncna nn nanns 68 i d Bara o Zt TRENT Lu au 5 n without Telit Communications S p A written authorization All Rights Reserved page 5 of 5 i mea p d Reproduction forbidde lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 1 Introduction 1 1 Scope The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE865 module 1 2 Audience This document is intended for Telit customers who are integrators about to implement their applications using our GE865 modules 1 3 Contact Information Support For general contact technical support to report documentation errors and to order manuals contact Telit s Technical Support Center TTSC at TS EMEA telit com TS NORTHAMERICA telit com TS LATINAMERICA telit com TS APAC telit com Alternatively use http www telit com en products technical support center contact php For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit http www telit com To register for product news and announcements or for product questions contact Telit s Technical Support Center TTSC Our aim is to make this guide as helpful as possible Keep us informed of your comments and suggestions for improvements Telit appreciates feedback from the users of our information orization All Rights Reserved
47. onjunction with any other antenna or transmitter If antenna is installed with a separation distance of less than 20 cm from all persons or is co located or operating in conjunction with any other antenna or transmitter then additional FCC IC testing may be required End Users must be provided with transmitter operation conditions for satisfying RF exposure compliance Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed operating configurations 7 2 GSM Antenna PCB line Guidelines e Ensure that the antenna line impedance is 500 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 GE865 antenna line e Keep the antenna line far away from the GE865 power supply lines f you have EM noisy devices around the PCB hosting the GE865 such as fast switching ICs take care of the shielding of the antenna line by burying it inside the layers of PCB and
48. p if you modify the waveform e g from square to sinus the frequency response will change 11 8 3 Power Supply Influence Applying a signal whose amplitude is different from that suggested by the manufacturer the performance change following the rule if resonance frequency f increases amplitude decreases Because resonance frequency depends on acoustic design by lowering the amplitude of the driving signal the response bandwidth tends to become narrow and vice versa Summarizing Vm 1 gt fo Vo 4 gt fof The risk is that the f could easily fall outside of new bandwidth consequently the SPL could be much lower than the expected WARNING It is very important to respect the sense of the applied voltage never apply to the pin a voltage more positive than the pin if this happens the diaphragm vibrates in the opposite direction with a high probability to be expelled from its physical position This damages the device permanently n m 11 8 4 Working Current Influence In the component data sheet you will find the value of MAX CURRENT this represents the maximum average current that can flow at nominal voltage without current limitation In other words it is not the peak current which could be twice or three times higher If driving circuitry does not support these peak values the SPL will never reach the declared level or the oscillations will stop Pl Reproduction forbidden without Telit Communicatio
49. rk where it is registered This behaviour is not a proper shut down because any GSM device is requested to issue a detach request on turn off For this reason the Reset signal must not be used to normally shutting down the device but only as an emergency exit in the rare case the device remains stuck waiting for some network response The RESET is internally controlled on start up to achieve always a proper power on reset sequence so there s no need to control this pin on start up It may only be used to reset a device already on that is not responding to any command NOTE Do not use this signal to power off the GE865 Use the ON OFF signal to perform this function or the ATZSHDN command Reset Signal Operating levels Signal Min Max RESET Input high 1 8V 2 1V RESET Input low OV 0 2V this signal is internally pulled up so the pin can be left floating if not used If unused this signal may be left unconnected If used then it must always be connected with an open collector transistor to permit to the internal circuitry the power on reset and under voltage lockout functions AB Ng Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 35 of 35 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 9 Serial Ports The serial port on the GE865 is the core of the interface between the module and OEM hardware 2 serial ports are available on th
50. rnal 47KQ pull up resistor either the DTR dtr uart and RTS rts uart input lines are not pulled up internally so an external precuela forbidden without Telit Communications S p A written authorization All Rights Reserved page 41 of 41 lel it GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 NOTE The input lines working at 2 8VCMOS can be pulled up with 47KO 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 It is recommended to disable any HIGH logic level applied to the digital pins when the module is switched off B Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 42 of 42 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 10 Audio Section Overview The Base Band Chip of the GE865 provides one audio path both in Uplink transmit and in Downlink receive direction as shown in the next figure For more information refer to Telit document 80000NT10007a Audio Settings Application Note Baseband Audio Front End Balanced Ear o Single ended Earpiece Drivers 16 Load EPN1 Balanced a a Single ended 100nF xgoldafe skd Audio Section Block Diagram E 2 EET
51. rocedure is displayed below Start AT ED ON_OFF HIGH Delay 1s Start AT CMD n without Telit Communications S p A written authorization All Rights Reserved page 18 of 18 i E tu i m I Reproduction forbidde lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 For example 1 Let s assume you need to drive the ON pad with a totem pole output of a 3 5 V microcontroller uP_OUT1 R1 10K uP OUT2 5 0402 3 3 V__ 1 V 1 4 Power ON OFF impulse 2 Let s assume you need to drive the ON pad directly with an ON OFF button GND 5 2 Turning OFF the GE865 Turning off of the device can be done in two ways e via AT command see GE865 Software User Guide ATZSHDN e by tying low pin ON Either ways the device issues a detach request to network informing that the device will not be reachable any more To turn OFF the GE865 the pad ON must be tied low for at least 2 seconds and then released A Pulse duration less than 2 seconds should also start the power off procedure but this is not guaranteed j lI W ah i F i E i i 3 gt Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 19 of 19 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 The same circuitry and timing for the power on must be used The device shuts down after the release of the ON pad The fo
52. rom 500ms to 1s after last TX burst m d h y s Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 48 of 48 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 11 6 Using the Alarm Output GPIO6 The GPIO6 pad when configured as Alarm Output is controlled by the GE865 module and will rise when the alarm starts and fall after the issue of a dedicated AT command This output can be used to power up the GE865 controlling microcontroller or application at the alarm time giving you the possibility to program a timely system wake up to achieve some periodic actions and completely turn off either the application and the GE865 during sleep periods dramatically reducing the sleep consumption to few pA In battery powered devices this feature will greatly improve the autonomy of the device 11 7 Using the Buzzer Output GPIO7 The GPIO7 pad when configured as Buzzer Output is controlled by the GE865 module and will drive a Buzzer driver with appropriate square waves 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 A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the GPIO7 TR2 V buzzer SMBT2907A Reproduction forbidden without Telit Communicatio
53. rt must always be implemented on the boards and the software must use it as an emergency exit procedure A simple circuit to do it is RESET F Unconditional Reboot Impulse ND Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 21 of 21 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 In the following flow chart is detailed the proper restart procedure Reset LOW Delay 200ms Reset HIGH Delay 1s Start AT CMD For example 1 Let us assume you need to drive the RESET pad with a totem pole output of a 3 5 V microcontroller uP_OUT2 zu page 22 of 22 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 6 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 6 1 Power Supply Requirements The external power supply must be connected to VBATT amp VBATT PA signals and must fulfill the following requirements POWER SUPPLY Nominal Supply Voltage 3 8V Normal Operating Voltage Range 3 4 V 4 20V Extended Operating Voltage Range 3 22 V 4 50 V NOTE The Operating Voltage Range MUST never be exceeded care must be taken in order to fulfil min max voltage requirem
54. rves the right to make modifications additions and deletions to this document due to typographical errors inaccurate information or improvements to programs and or equipment at any time and without notice Such changes will nevertheless be incorporated into new editions of this application note All rights reserved O 2009 Telit Communications S p A u2 Ea e oroduelan forbidden without Telit Communications S p A written authorization All Rights Reserved page 3 of 3 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 Contents APPLICABILITY TABlEscoiniioanaaa adds diia 2 1 INTRODUCTION 6 LAS COPE EUER 1 2 AUDIENCE 1 3 CONTACT INFORMATION SUPPORT 1 4 DOCUMENT ORGANIZATION 2 da Bn Rh a d E XX CHAR Ca Fa C CEPR odas C d D a Sa P e RE LR RR FR v ER aan pA Suse idee c 8 T6 RELATED DOCUMENTS ca adi 8 17 DOCUMENT HISTORY dee 9 2 UTA NS 10 3 GE865 MECHANICAL DIMENSIONS 3 sccccccicciceccicccesccseavensecceiccnsstcuveccedecevensdavcuseccetsctecdeutecsedscesseseevensacseisesectoeasestesenee 11 4 GE865 MODULE CONNECTIONS 2 5 1 0 a aaro eoo an cbeadecin dheducescenguccecceauancteadseaccdecuseiceasecgecetsesbedeadsaiacuesusedseaauboecee 12 MRLelbmec EEUU 12 ATT BGA BAONS LO OU T EE
55. s all three modes and can be input output RF Transmission Control Alternate function a E Reproduction forbidden without Telit Communications S p A written authorization All Rights h page 46 of 46 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 e GPIO5 supports all three modes and can be input output RFTX monitor output Alternate function e GPIO6 supports all three modes and can be input output alarm output Alternate function e GPIO7 supports all three modes and can be input output buzzer output Alternate function 11 1 GPIO Logic levels Where not specifically stated all the interface circuits work at 2 8V CMOS logic levels The following table shows the logic level specifications used in the GE865 interface circuits Absolute Maximum Ratings Not Functional Input level on any digital pin 0 3V 3 1V when on CMOS 2 8 Input level on any digital pin 0 3V 2 1V when on CMOS 1 8 Input voltage on analog pins 0 3V 3 0V when on Operating Range Interface levels 2 8V CMOS Input high level 2 1V 3 0V Input low level OV 0 5V Output high level 2 2V 3 0V Output low level OV 0 35V For 1 8V signals Operating Range Interface levels 1 8V CMOS Input high level 1 6V 2 0V Input low level OV 0 4V Output high level 1 65V 1 85V Output low level OV 0 35V 3 n La s Reproduction forbidden without Telit Communications S p A written authorization All Rights R
56. surround it with Ground planes or shield it with a metal frame cover e f you don t have EM noisy devices around the PCB of GE865 by using a strip line on the superficial copper layer for the antenna line the line attenuation will be lower than a buried one zt AA EN gt y 3 ig Tq LOBATAN i ae f 5 4 ab D IS r Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 32 of 32 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 7 3 GSM Antenna Installation Guidelines e Install the antenna in a place covered by the GSM signal e If the device antenna is located greater then 20cm from the human body and there are no co located transmitter then the Telit FCC IC approvals can be re used by the end product e f the device antenna is located less then 20cm from the human body or there are no co located transmitter then the additional FCC IC testing may be required for the end product Telit FCC IC approvals cannot be reused Antenna shall not be installed inside metal cases e Antenna shall be installed also according Antenna manufacturer instructions H E nr M 5 AE 1 ad a si j E i 2 ake i s d DH vs A ul uM i E ga 2 an ERUNT re J pan 2 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 33 of 33 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 200
57. th standard IPC JEDEC J STD 020 take care all the relatives requirements for using this kind of components f gt T l i gt l Mg E t mp M Jj ml A a Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 65 of 65 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 15 Conformity Assessment Issues The Telit GE865 Module has been assessed in order to satisfy the essential requirements of the R amp TTE Directive 1999 05 EC Radio Equipment amp Telecommunications Terminal Equipments to demonstrate the conformity against the harmonised standards with the final involvement of a Notified Bogy If the module is installed in conformance to the Telit installation manuals 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 the 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 This Hardware User Guide contain all the information you may need for developing a product meeting the R
58. udio B8 MIC Al Mic signal input phase Audio C8 MIC Al Mic signal input phase Audio SIM card interface A5 SIMCLK O External SIM signal Clock 1 8 3V A8 SIMRST O External SIM signal Reset 1 8 3V A6 SIMIO VO External SIM signal Data I O 4 7K Pull up 1 8 3V B7 SIMIN External SIM signal Presence active low 1 8 3V A7 SIMVCC y External SIM al supply for the 1 8 3V Trace D1 TXD_AUX O Auxiliary UART TX Data CMOS 2 8V El RXD_AUX l Auxiliary UART RX Data CMOS 2 8V Prog Data HW Flow Control A3 C103 TXD l Serial data input TXD from DTE CMOS 2 8V A4 C104 RXD O Serial data output to DTE CMOS 2 8V B3 C108 DTR Input for Data a signal DTR from CMOS 2 8V M C105 RTS Input for Request Dd signal RTS from CMOS 2 8V A2 C106 CTS O Output for Clear to send signal CTS to DTE CMOS 2 8V B5 C109 DCD O Output for Data ae signal DCD to CMOS 2 8V B2 C107 DSR O Output for Data set ready signal DSR to DTE CMOS 2 8V B4 C125 RING O Output for Ring indicator signal RI to DTE CMOS 2 8V DAC and ADC G7 DAC OUT AO Digital Analog converter output D A F5 ADC_IN1 Al Analog Digital converter input A D F6 ADC_IN2 Al Analog Digital converter input A D Miscellaneous Functions C1 RESET Reset input H2 VRTC AO VRTC Backup capacitor Power G8 STAT_LED O Status indicator led CMOS 1 8V B1 ON_OFF Input command for switching power ON or 47K Pull Up Pull up to VRTC OFF toggle command page 12 of 12 lelit GE865 Hardware User Guide 1vv0
59. ut 216 Hz and the relative current peaks can be as high as about 2A Therefore the power supply has to be designed in order to withstand with these current peaks without big voltage drops this means that both the electrical design and the board layout must be designed for this current flow If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the supply this will reflect on all the audio paths producing an audible annoying noise at 216 Hz if the voltage drop during the peak current absorption is too much then the device may even shutdown as a consequence of the supply voltage drop NOTE 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 Reproduction forbidde F Eds Cua n without Telit Communications S p A written authorization All Rights Reserved page 24 of 24 lelit GE865 Hardware User Guide 1vv0300799 Rev 10 22 09 2009 6 3 General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps e the electrical design e the thermal design e the PCB layout 6 3 1 Electrical Design Guidelines The electrical design of the power supply depends strongly from the power source where this power is drained We will distinguish them into three categories 5V input typically PC internal regulator output 12V input typically automotiv

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