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Telit Wireless Solutions HE920-EU Скачать руководство пользователя страница 34

 
 

 

 

HE920 Hardware User Guide

 

1vv0301014 Rev.9 – 2014-01-23

 

Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights 
Reserved. 

 

Page 34 of 84 

 

In GSM/GPRS mode, RF transmission is not continuous and it is packed into bursts at a base 
frequency of about 216 Hz, and the relative current peaks can be as high as about 2A.

 

Therefore the power supply has to be designed in order to withstand 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; this will reflect on all the audio paths producing an audible 
annoying noise at 216 Hz; if the voltage drops during the peak, current absorption is too much. 
The device may even shut down as a consequence of the supply voltage drop.

 

Содержание HE920-EU

Страница 1: ...HE920 Hardware User Guide 1vv0301014 Rev 9 2014 01 23...

Страница 2: ...dware User Guide 1vv0301014 Rev 9 2014 01 23 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 2 of 84 APPLICABILITY TABLE PRODUCT HE920 EU...

Страница 3: ...for Telit and its licensors certain exclusive rights for copyrighted material including the exclusive right to copy reproduce in any form distribute and make derivative works of the copyrighted mater...

Страница 4: ...slated into any language or computer language in any form or by any means without prior written permission of Telit High Risk Materials Components units or third party products used in the product des...

Страница 5: ...ions 13 2 3 Weight 13 2 4 Environmental requirements 14 2 4 1 Temperature range 14 2 4 2 RoHS compliance 14 2 5 Operating Frequency 14 3 HE920 Module Connections 16 3 1 PIN OUT 16 3 1 1 LGA Pads Layou...

Страница 6: ...Installation Guidelines 44 6 4 Antenna Diversity Requirements 44 6 5 GPS GNSS Antenna Requirements 45 6 5 1 Combined GPS GNSS Antenna 45 6 5 2 Linear and Patch GPS GNSS Antenna 45 6 5 3 LNA and Front...

Страница 7: ...1 Description 63 12 2 2 Using ADC Converter 63 13 Mounting the module on your board 64 13 1 General 64 13 2 Module Finishing Dimensions 65 13 3 Recommended foot print for the application 66 13 4 Sten...

Страница 8: ...2014 01 23 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 8 of 84 16 1 1999 5 EC Directive 79 16 2 FCC IC Regulatory notices 81 17 Safety...

Страница 9: ...ut to implement their applications using our HE920 module 1 3 Contact Information Support For general contact technical support to report documentation errors and to order manuals contact Telit s Tech...

Страница 10: ...nds How to control the module via hardware Chapter 5 Power Supply deals on supply and consumption Chapter 6 Antenna The antenna connection and board layout design are the most important parts in the f...

Страница 11: ...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 integratin...

Страница 12: ...ons to be avoided must be considered as mandatory while the suggested hardware configurations must not be considered mandatory instead the information given must be used as a guide and a starting poin...

Страница 13: ...without written authorization from Telit Communications S p A All Rights Reserved Page 13 of 84 2 2 HE920 Mechanical Dimensions The Telit HE920 module overall dimensions are Length 34 mm Width 40 mm T...

Страница 14: ...y meets the ETSI specifications 40 C 85 C The module is fully functional in all the temperature range Temperatures outside of the range 20 C 55 C might slightly deviate from ETSI specifications Storag...

Страница 15: ...251 45 MHz EGSM900 890 0 914 8 935 0 959 8 0 124 45 MHz 880 2 889 8 925 2 934 8 975 1023 45 MHz DCS1800 1710 2 1784 8 1805 2 1879 8 512 885 95MHz PCS1900 1850 2 1909 8 1930 2 1989 8 512 810 80MHz WCDM...

Страница 16: ...CTS to DTE 1 8V AE18 C109 DCD O Output for Data carrier detect signal DCD to DTE 1 8V AG18 C107 DSR O Output for Data set ready signal DSR to DTE 1 8V AJ18 C125 RING O Output for Ring indicator signal...

Страница 17: ...on S1 ANT_GPS I GPS Antenna 50Ohm RF V2 GPS_LNA_EN O Output enable for External LNA supply 1 8V Miscellaneous Function AP1 RESET I Reset Input 1 8V Active Low AS1 ON_OFF I Input Command for Power ON O...

Страница 18: ...ound B15 GND Ground B17 GND Ground C4 GND Ground C6 GND Ground D3 GND Ground D7 GND Ground E18 GND Ground F1 GND Ground G18 GND Ground H19 GND Ground M1 GND Ground N2 GND Ground P1 GND Ground P3 GND G...

Страница 19: ...AP13 GND Ground AP15 GND Ground AR2 GND Ground AR4 GND Ground AR6 GND Ground AR8 GND Ground AR10 GND Ground AR12 GND Ground AR14 GND Ground AR16 GND Ground AS5 GND Ground AS7 GND Ground AS9 GND Groun...

Страница 20: ...15 Reserved Reserved G2 Reserved Reserved H1 Reserved Reserved H3 Reserved Reserved H17 Reserved Reserved J2 Reserved Reserved J18 Reserved Reserved K1 Reserved Reserved K3 Reserved Reserved K17 Reser...

Страница 21: ...must be connected in order to enter HE920 s power saving mode NOTE RI pin must be connected in order to wake up the host when a call is coming in sleep mode of host NOTE RESERVED pins must not be conn...

Страница 22: ...Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 22 of 84 AS1 ON OFF AP1 RESET D19 USB_D F19 USB_D A18 USB_VBUS AH19 C103 TXD AF19 C104 RXD...

Страница 23: ...HE920 Hardware User Guide 1vv0301014 Rev 9 2014 01 23 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 23 of 84 3 1 1 LGA Pads Layout...

Страница 24: ...orbidden without written authorization from Telit Communications S p A All Rights Reserved Page 24 of 84 NOTE The pin defined as RES has to be considered RESERVED and not connected on any pin in the a...

Страница 25: ...ow 4 2 Initialization and Activation state Upon turning on HE920 module The HE920 is not activated yet because the boot sequence of HE920 is still going on internally It takes about 10 seconds to comp...

Страница 26: ...to latch up problems on the HE920 power regulator and improper power on off of the module The line ON_OFF must be connected only in open collector configuration NOTE In this document all the lines ar...

Страница 27: ...vice is shut down by software command or by hardware shutdown pad ON_OFF it issues to the network a detach request that informs the network that the device will not be reachable any more TIP To check...

Страница 28: ...into the finalization state and finally will shut down PWRMON at the end of this state The period of the finalization state can differ according to the situation in which the HE920 is so it cannot be...

Страница 29: ...When the hold time of ON_OFF is above 2 seconds HE920 goes into the finalization state and finally will shut down PWRMON at the end of this state The period of the finalization state can differ accor...

Страница 30: ...and then released A simple circuit to do it is NOTE Do not use any pull up resistor on the RESET line or any totem pole digital output Using pull up resistor may bring to latch up problems on the HE9...

Страница 31: ...ntroller uP_OUT2 4 5 Hardware Unconditional Shutdown Power Off The Unconditional Shutdown of the module could be activated using the SHDN line pad AN12 WARNIG The hardware unconditional Shutdown must...

Страница 32: ...istor may bring to latch up problems on the HE920 power regulator and improper functioning of the module The line SHDN must be connected only in open collector configuration The SHDN is generating an...

Страница 33: ...15 AT CFUN 4 WCDMA 13 Disabled TX and RX modules is not registered on the network GSM 13 AT CFUN 0 or AT CFUN 5 WCDMA 3 2 1 0 Power saving CFUN 0 module registered on the network and can receive voic...

Страница 34: ...2A Therefore the power supply has to be designed in order to withstand these current peaks without big voltage drops this means that both the electrical design and the board layout must be designed f...

Страница 35: ...battery 5 2 1 1 5V Input Source Power Supply Design Guidelines The desired output for the power supply is 3 8V hence there is not a big difference between the input source and the desired output and...

Страница 36: ...regulator to respond quickly to the current peaks absorption In any case the frequency and Switching design selection is related to the application to be developed due to the fact the switching freque...

Страница 37: ...14 01 23 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 37 of 84 An example of switching regulator with 12V input is in the below schemat...

Страница 38: ...e for HE920 and damage it NOTE Do not use any Ni Cd Ni MH and Pb battery types directly connected with HE920 Their use can lead to overvoltage on HE920 and damage it Use only Li Ion battery types A By...

Страница 39: ...ficantly only during calls If we assume that the device stays in transmission for short periods of time let us say few minutes and then remains for quite a long time in idle let us say one hour then t...

Страница 40: ...ection diode must be placed close to the input connector where the power source is drained The PCB traces from the input connector to the power regulator IC must be wide enough to ensure no voltage dr...

Страница 41: ...thorization from Telit Communications S p A All Rights Reserved Page 41 of 84 overlapped to any noise sensitive circuitry as the microphone amplifier buffer or earphone amplifier The power supply inpu...

Страница 42: ...s required in order to connect with it or with its connector This transmission line shall fulfill the following requirements Antenna Line on PCB Requirements Characteristic Impedance 50Ohm Max Attenua...

Страница 43: ...as short as possible since the antenna line loss shall be less than around 0 3dB Line geometry should have uniform characteristics constant cross section avoid meanders and abrupt curves Any kind of s...

Страница 44: ...ns 6 4 Antenna Diversity Requirements This product is including an input for a second RX antenna to improve the radio sensitivity The function is called Antenna Diversity ANTENNA REQUIREMENTS Frequenc...

Страница 45: ...nd adds a loss in the RF route In addition the combination of antennas requires an additional diplexer which adds significant power losses in the RF path 6 5 2 Linear and Patch GPS GNSS Antenna Using...

Страница 46: ...42MHz 2 0dB Max Insertion Loss 1597 5515 1605 886MHZ 2 0dB Max WARNING The HE920 software is implemented differently depending on the configurations of an external device Please refer to the AT comman...

Страница 47: ...his line of transmission shall fulfill the following requirements Antenna Line on PCB Requirements Characteristic Impedance 50Ohm Max Attenuation 0 3dB Coupling with other signals shall be avoided Col...

Страница 48: ...vices are around the PCB hosting the HE920 such as fast switching ICs take care of shielding of antenna line by burying it inside the layers of PCB and surround it with Ground planes or shield it with...

Страница 49: ...ions used in the Telit HE920 interface circuits NOTE Do not connect HE920 s digital logic signal directly to OEM s digital logic signal of with level higher than 2 7V for 1 8V CMOS signals For 1 8V CM...

Страница 50: ...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 There is no need to control this pin o...

Страница 51: ...nsfers The USB_DPLUS and USB_DMINUS signals have a clock rate of 480MHz The signal traces should be routed carefully Trace lengths number of vias and capacitive loading should be minimized The impedan...

Страница 52: ...voltages different from 1 8V Depending on 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 does not need a leve...

Страница 53: ...ata Set Ready Output from the HE920 that indicates the module is ready 7 RTS rts_uart AA18 Request to Send Input to the HE920 that controls the Hardware flow control 8 CTS cts_uart AK19 Clear to Send...

Страница 54: ...gnals 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 0V and hence some sort...

Страница 55: ...M transceiver MAX218 In this case the chipset is capable of translating directly from 1 8V to the RS232 levels Example on 4 signals only NOTE In this case has to be taken in account the length of the...

Страница 56: ...se refer to the xE920_Audio_Settings_Application_Note 80404NT10095A 10 2 Digital Audio HE920 module can be connected to external codec through digital interface The product is providing one Digital Au...

Страница 57: ...the function implemented The following GPIOs are available on the HE920 PAD Signal I O Function Type Drive Strength F9 GPIO_01 I O Configurable GPIO B PD 1 8V 2 mA E10 GPIO_02 I O Configurable GPIO B...

Страница 58: ...al pin when on 0 3V 2 7V Input voltage on analog pins when on 0 3V 2 7 V Operating Range Interface levels 1 8V CMOS Level HE920 Min Max Input high level 1 5V 2 1V Input low level 0 3V 0 5V Output high...

Страница 59: ...ation from Telit Communications S p A All Rights Reserved Page 59 of 84 11 3 Using a GPIO Pad as Output The GPIO pads when used as outputs can drive 1 8V CMOS digital devices or compatible hardware Wh...

Страница 60: ...High Logic level a GPIO when the maximum temperature is reached 11 5 Indication of Network Service Availability The STAT_LED pin status shows information on the network service availability and Call s...

Страница 61: ...To this power output a backup capacitor can be added in order to increase the RTC autonomy during power off of the battery NOTE NO devices must be powered from this pin 11 7 VAUX Power Output A regula...

Страница 62: ...023 Steps The precision is 1023 steps so if we consider that the maximum voltage is 1 8V the integrated voltage could be calculated with the following formula Integrated output voltage 1 8 value 1023...

Страница 63: ...to read a voltage level in the range of 0 2 volts applied on the ADC pin input and store and convert it into 8 bit word Min Max Units Input Voltage range 0 2 0 Volt AD conversion 8 bits Resolution 8 6...

Страница 64: ...ction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 64 of 84 13 Mounting the module on your board 13 1 General The HE920 modules have been designed i...

Страница 65: ...20 Hardware User Guide 1vv0301014 Rev 9 2014 01 23 Reproduction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 65 of 84 13 2 Module Finishing Dimensio...

Страница 66: ...pads Top View In order to easily rework the HE920 it is suggested to consider on the application having a 1 5 mm placement inhibit area around the module It is also suggested as a common rule for an...

Страница 67: ...ion from Telit Communications S p A All Rights Reserved Page 67 of 84 13 4 Stencil Stencil s apertures layout can be the same as the recommended footprint 1 1 we suggest a thickness of stencil foil 12...

Страница 68: ...uction forbidden without written authorization from Telit Communications S p A All Rights Reserved Page 68 of 84 13 6 Recommendations for PCB Pad Dimensions mm The recommendation for the PCB pads dime...

Страница 69: ...mendations for PCB Pad Surfaces Finish Layer thickness um Properties Electro less Ni Immersion Au 3 7 0 05 0 15 good solder ability protection high shear force values The PCB must be able to resist th...

Страница 70: ...authorization from Telit Communications S p A All Rights Reserved Page 70 of 84 13 7 Solder Paste Lead free Solder Paste Sn Ag Cu We recommend using only no clean solder paste in order to avoid the c...

Страница 71: ...smin Temperature Max Tsmax Time min to max ts 150 200 60 180 seconds Tsmax to TL Ramp up Rate 3 second max Time maintained above Temperature TL Time tL 217 60 150 seconds Peak Temperature Tp 245 0 5 T...

Страница 72: ...test and debug the mounting of HE920 we strongly recommend foreseeing test pads on the host PCB in order to check the connection between the HE920 itself and the application and to test the performanc...

Страница 73: ...o the various applications The customers have to pay special attention to this when they design their application board The length and width of the power lines need to be considered carefully and the...

Страница 74: ...be designed and what values the components should have NOTE FOR R1 The resistor value on SIMIO pulled up to SIMVCC should be defined accordingly in order to be compliant to 3GPP specification For HE9...

Страница 75: ...terface A8 SIMVCC External SIM signal Power supply for the SIM 8KV 15KV B11 SIMRST O External SIM signal Reset 8KV 15KV B9 SIMIO I O External SIM signal Data I O 8KV 15KV A10 SIMCLK O External SIM sig...

Страница 76: ...s software and debug HE920 when HE920 is already mounted on a host system Users who use both of UART and USB interfaces to communicate HE920 Must implement a download method in a host system for upgra...

Страница 77: ...TS WARNIG These trays can withstand a maximum temperature of 65 15 2 Moisture Sensibility The HE920 is a Moisture Sensitive Device level 3 in accordance with standard IPC JEDEC J STD 020 take care all...

Страница 78: ...ll Rights Reserved Page 78 of 84 c The maximum time between the opening of the sealed bag and the reflow process must be 168 hours if condition b IPC JEDEC J STD 033A paragraph 5 2 is respected d Baki...

Страница 79: ...ectrum use R TTE art 3 2 EN 300 440 2 V1 4 1 EN 301 511 V9 0 2 EN 301 908 1 V5 2 1 EN 301 908 2 V5 2 1 EMC R TTE art 3 1b EN 301 489 1 V1 9 2 EN 301 489 3 V1 4 1 EN 301 489 7 V1 3 1 EN 301 489 24 V1 5...

Страница 80: ...y lead to testing Telit Communications S p A recommends carrying out the following assessments RF spectrum use R TTE art 3 2 It will depend on the antenna used on the final product EMC R TTE art 3 1b...

Страница 81: ...rie Canada applicables aux appareils radio exempts de licence L exploitation est autoris e aux deux conditions suivantes 1 l appareil ne doit pas produire de brouillage et 2 l utilisateur de l apparei...

Страница 82: ...e harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the foll...

Страница 83: ...ns 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 func...

Страница 84: ...Updated 14 2 Bypass capacitor on Power supplies Updated 14 4 EMC recommendations Updated 15 2 Moisture Sensibility 3 2012 11 14 Updated 5 1 Power Supply Requirements Updated 6 1 GSM WCDMA Antenna Requ...

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