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SimCom SIM548C HD V1.01, Проектирование аппаратного обеспечения

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SIM548C Hardware Design                                                       

 

 

Figure 35: Theory of the GPS RTC circuit 

 

4.6 The theory of the RESET Circuit   

There is a RESET IC in the module’s GPS part. If the input of the reset IC is lower than 2.3V, the 
“reset” pin will keep low; then the input voltage is higher than 2.3V, the RESET IC will output a 
low level voltage for about 220mS as a reset signal. After that the reset output pin will be kept 
high. So, if the user wants to reset the module’s GPS part, the GPS_M-RST should be pulled 
down longer than 10ms, and then pull it up. The theory of the RESET Circuit is shown in the 
figure:   

 

Figure 36: Theory of the RESET circuit 

SIM548C_HD_V1.01

                                                                                                               

        09.05.2008

 

 

68

Содержание SIM548C HD V1.01

Страница 1: ...Hardware Design SIM548C_HD_V1 01 ...

Страница 2: ...alidation of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customer s system integrator All specifications supplied herein are subject to change Copyright This document contains proprietary technical information which is the property of SIMCom Limited copying of this document and giving it to others and the using or communicatio...

Страница 3: ...the PWRKEY pin 32 3 5 Charging interface 32 3 5 1 Battery pack characteristics 33 3 5 2 Recommended battery pack 34 3 5 3 Implemented charging technique 35 3 5 4 Operating modes during charging 36 3 5 5 Charger requirements 38 3 6 Power saving 38 3 6 1 Minimum functionality mode 38 3 6 2 SLEEP mode slow clock mode 39 3 6 3 Wake up the GSM part from SLEEP mode 39 3 7 Summary of state transitions ex...

Страница 4: ...0 4 9 1 Coldstart 70 4 9 2 Warmstart 70 4 9 3 Hotstart 71 5 Antenna interface 72 5 1 GSM Antenna 72 5 1 1 GSM Antenna connector 72 5 1 2 GSM Antenna pad 72 5 1 3 Module RF output power 74 5 1 4 Module RF receive sensitivity 74 5 1 5 Module operating frequencies 74 5 2 GPS Antenna 74 5 2 1 GPS Antenna Connection 74 5 2 2 GPS Antenna Choice Consideration 75 6 Electrical reliability and radio charact...

Страница 5: ...90060 09T R 87 7 3 2 Adapter cabling 88 APPENDIX A PIN assignment of board to board connector 89 APPENDIX B Reference Circuit with external MCU GPS standalone application 91 APPENDIX C Reference Diagram with external MCU AGPS application 92 SIM548C_HD_V1 01 09 05 2008 5 ...

Страница 6: ...RD TO BOARD CONNECTOR 54 TABLE 19 PIN DEFINITION AMPHENOL SIM CARD HOLDER 56 TABLE 20 PIN DEFINITION MOLEX SIM CARD HOLDER 57 TABLE 21 PIN DEFINITION OF THE LCD INTERFACE 57 TABLE 22 ADC SPECIFICATION 58 TABLE 23 PIN DESCRIPTION OF THE GPIO INTERFACE 58 TABLE 24 BEHAVIOURS OF THE RI LINE 58 TABLE 25 WORKING STATE OF THE NETLIGHT 60 TABLE 26 BUZZER OUTPUT CHARACTERISTICS 61 TABLE 27 PIN DEFINITION ...

Страница 7: ...NNECTION OF SOFTWARE DEBUG 48 FIGURE 20 RS232 LEVEL CONVERTER CIRCUIT 49 FIGURE 21 SPEAKER INTERFACE CONFIGURATION 50 FIGURE 22 SPEAKER INTERFACE WITH AMPLIFIER CONFIGURATION 51 FIGURE 23 MICROPHONE INTERFACE CONFIGURATION 51 FIGURE 24 EARPHONE INTERFACE CONFIGURATION 52 FIGURE 25 SIM INTERFACE REFERENCE CIRCUIT WITH 8 PIN SIM CARD 54 FIGURE 26 SIM INTERFACE REFERENCE CIRCUIT WITH 6 PIN SIM CARD 5...

Страница 8: ...ASTRON1590060 09T R BOARD TO BOARD CONNECTOR 87 FIGURE 46 ASTRON BOARD TO BOARD CONNECTOR PHYSICAL PHOTO 87 FIGURE 47 MM9329 2700B 88 FIGURE 48 RF CONNECTOR MXTK 88 FIGURE 49 PHYSICAL SIM548C 90 FIGURE 50 REFERENCE CIRCUIT WITH EXTERNAL MCU STANDALONE APPLICATION FOR EXAMPLE 91 FIGURE 51 AGPS CONNECTION 92 SIM548C_HD_V1 01 09 05 2008 8 ...

Страница 9: ...sion Description of change Author 2008 05 09 1 01 Origin Tanshi Scope of the document This document is intended for the following versions of the SIMCom GSM GPRS GPS modules SIM548C GSM GPRS 850 900 1800 1900MHz Version SIM548C_HD_V1 01 09 05 2008 9 ...

Страница 10: ...name Remark 1 SIM548C_ATC SIM548C_ATC 2 GPS_AN01 GPS_AN01_GPS_Command_Examples 3 GPS_AN02 GPS_AN02_AGPS_Application 4 ITU T Draft new recommendation V 25ter Serial asynchronous automatic dialing and control 5 GSM 07 07 Digital cellular telecommunications Phase 2 AT command set for GSM Mobile Equipment ME 6 GSM 07 05 Digital cellular telecommunications Phase 2 Use of Data Terminal Equipment Data Ci...

Страница 11: ...viation Description ADC Analog to Digital Converter ARP Antenna Reference Point ASIC Application Specific Integrated Circuit BER Bit Error Rate BTS Base Transceiver Station CHAP Challenge Handshake Authentication Protocol CS Coding Scheme CSD Circuit Switched Data CTS Clear to Send DAC Digital to Analog Converter DRX Discontinuous Reception DSP Digital Signal Processor DTE Data Terminal Equipment ...

Страница 12: ...rd Authentication Protocol PBCCH Packet Switched Broadcast Control Channel PCB Printed Circuit Board PCS Personal Communication System also referred to as GSM 1900 PDU Protocol Data Unit PPP Point to point protocol RF Radio Frequency RMS Root Mean Square value RP Receive Protocol RTC Real Time Clock Rx Receive Direction SA Selective Availability SAR Specific Absorption Rate SIM Subscriber Identifi...

Страница 13: ...book abbreviations FD SIM fix dialing phonebook LD SIM last dialing phonebook list of numbers most recently dialed MC Mobile Equipment list of unanswered MT calls missed calls ME Mobile Equipment phonebook RC Mobile Equipment list of received calls SM SIM phonebook DC ME dialed calls list CPBW may not be applicable or this storage same as LD LA Last Number All list LND LNM LNR ON SIM or ME own num...

Страница 14: ...rface will give you the flexibility to develop customized applications z One serial GSM port and two serial GPS pots can help you easily develop your applications z Two audio channels include two microphones inputs and two speakers outputs These can be easily configured by AT command z Charge interface With the charge circuit integrated inside the SIM548C it is very suitable for the battery power ...

Страница 15: ...iant to GSM Phase 2 2 GSM class Small MS Transmitting power z Class 4 2W at EGSM 900 GSM 850 z Class 1 1W at DCS 1800 PCS 1900 GPRS connectivity z GPRS multi slot class 10 default z GPRS multi slot class 8 option z GPRS mobile station class B GPS features z GPS receiver with SiRFstar III chip set z Processor type ARM7 TDMI Temperature range z Operation Temperature Normal operation 30 C to 80 C Res...

Страница 16: ... 06 60 06 80 z Adaptive multi rate AMR z Echo Cancellation Serial GSM port and Debug port z Serial port Seven lines on Serial Port Interface z Serial Port can be used for CSD FAX GPRS service and send AT command of controlling module z Serial Port can use multiplexing function z Autobauding supports baud rate from 4800 bps to 115200bps z Debug Port Two lines on debug port interface DBG_TXD and DBG...

Страница 17: ...ing scheme 1 Timeslot 2 Timeslot 4 Timeslot CS 1 9 05kbps 18 1kbps 36 2kbps CS 2 13 4kbps 26 8kbps 53 6kbps CS 3 15 6kbps 31 2kbps 62 4kbps CS 4 21 4kbps 42 8kbps 85 6kbps 2 2 Functional diagram The SIM548C have two circuits parts GSM part and GPS part which are place on one PCB and have only one connector The following figure shows a functional diagram of the SIM548C and illustrates the mainly fu...

Страница 18: ...tion of SIM548C SIMCom can supply an Evaluation Board EVB that interfaces the SIM548C directly with appropriate power supply SIM card holder RS232 serial port handset port earphone port antenna and all GPIOs of the SIM548C For details please refer to the SIM548C EVB_UGD document SIM548C_HD_V1 01 09 05 2008 18 ...

Страница 19: ...ector pin description Power Supply PIN NAME I O DESCRIPTION DC CHARACTERISTICS VBAT 4 VBAT pins of the board to board connector are dedicated to connect the supply voltage The power supply of the GSM part of 548C has to be a single voltage source of VBAT 3 4V 4 5V It must be able to provide sufficient current in a transmitting burst which typically rises to 2A mostly These 4 pins are voltage input...

Страница 20: ...IC2N I Auxiliary positive and negative voice band input SPK1P SPK1N O Positive and negative voice band output SPK2P SPK2N O Auxiliary positive and negative voice band output BUZZER O Buzzer output AGND Analog ground Display interface DISP_DATA I O DISP_CLK O DISP_D C O DISP_CS O DISP_RST O LCD display interface VILmin 0V VILmax 0 9V VIHmin 2 0V VIHmax 3 2V VOLmin GND VOLmax 0 2V VOHmin 2 7V VOHmax...

Страница 21: ... Voltage supply for SIM card The voltage can be select by software automatically either 1 8V or 3V SIM_DATA I O SIM data output SIM_CLK O SIM clock SIM_PRESENCE I SIM card detection SIM_RST O SIM reset VILmin 0V VILmax 0 3 SIM_VDD VIHmin 0 7 SIM_VDD VIHmax SIM_VDD 0 3 VOLmin GND VOLmax 0 2V VOHmin SIM_VDD 0 2 VOHmax SIM_VDD AUXADC PIN NAME I O DESCRIPTION DC CHARACTERISTICS ADC0 I General purpose ...

Страница 22: ...e is GPRS data in transfer PPP or TCP or UDP In this case power consumption is related with network settings e g power control level uplink downlink data rates and GPRS configuration e g used multi slot settings POWER DOWN Normal shutdown by sending the AT CPOWD command or using the PWRKEY The power management ASIC disconnects the power supply from the base band part of the module and only the pow...

Страница 23: ...and GPRS DATA 3 3 Power supply The power supply of SIM548C GSM part is from a single voltage source of VBAT 3 4V 4 5V In some case the ripple in a transmitting burst may cause voltage drops when current consumption rise to typical peaks of 2A So the power supply must be able to provide sufficient current up to 2A For the VBAT input a local bypass capacitor is recommended A capacitor about 100µF lo...

Страница 24: ...ally with the 2A peak current in burst mode of the module The single 3 6V Li Ion cell battery type can be connected to the power supply of the module VBAT directly But the Ni_Cd or Ni_MH battery types must be used carefully since their maximum voltage can rise over the absolute maximum voltage for the module and damage it Figure 3 Reference circuit of the source power supply input The following fi...

Страница 25: ...rack on the host board into account The PCB traces from the VBAT pins of connector to the power source must be wide enough to ensure less voltage drops occur in the transmitting burst mode 3 3 3 Monitoring power supply To monitor the supply voltage you can use the AT CBC command which include three parameters charging status voltage percentage and voltage value in mV It returns charge state the ba...

Страница 26: ...de RDY should be received from the serial port all the time when the GSM part is power on Please refer to the chapter AT IPR in document 1 3 4 1 1 Turn on the GSM part using the PWRKEY pin Power on You can turn on the GSM part of the module by driving the PWRKEY to a low level voltage for some time and then release This pin is pulled up to VBAT in the module The maximum current that can be drained...

Страница 27: ...scribed in chapter 3 5 charger can be connected to the GSM part of the module s VCHG pin regardless of the module s operating mode If the charger is connected to the module s VCHG pin while the GSM part of the module is in POWER DOWN mode it will go into the GHOST mode Off and charging In this mode the module will not register to network and only a few AT commands can work in this mode For detaile...

Страница 28: ...e used as well as in normal mode Use the AT CALARM command to set the alarm time The RTC remains the alarm time if the GSM part of the module is power down by AT CPOWD 1 or by PWRKEY pin Once the alarm time is expired and executed the GSM part of the module will go into the Alarm mode In this case the GSM part of the module will send out an Unsolicited Result Code URC RDY ALARM MODE During alarm m...

Страница 29: ...ature Automatic shutdown Take effect if over temperature or under temperature is detected 3 4 2 1 Turn off the GSM part using the PWRKEY pin Power down You can turn off the GSM part of SIM548C by driving the PWRKEY to a low level voltage for some time Please refer to the turn on circuit The power down scenarios illustrate as figure 4 This procedure lets the module log off from the network and allo...

Страница 30: ...ent the commands can t be executed The GSM part enters the POWER DOWN mode only the RTC is still active POWER DOWN can also be indicated by STATUS pin which is a low level voltage in this mode Please refer to document 1 for detail about the AT command of AT CPOWD 3 4 2 3 Over voltage or under voltage automatic shutdown The module will constantly monitor the voltage applied on the VBAT if the volta...

Страница 31: ...module if the temperature is equal or higher than 85 the following URC will be presented CMTE 1 If the temperature 40 the following URC will be presented CMTE 1 The uncritical temperature range is 45 to 90 If the temperature 90 or 45 the module will be automatic shutdown soon If the temperature 90 the following URC will be presented CMTE 2 If the temperature 45 the following URC will be presented ...

Страница 32: ... module you need delay at least 500ms from detecting the STATUS low level on The restarting scenarios illustrates as the following figure STATUS VIL 0 6V Figure 9 Timing of restart GSM part 3 5 Charging interface The GSM part of the module has integrated a charging circuit for Li Ion batteries charging control which make it very convenient for applications to manage their battery charging A common...

Страница 33: ...ck compliant with these specifications is also important for the AT command AT CBC to monitor the voltage of battery or the AT CBC may return incorrect battery capacity values z The maximum charging voltage of the Li Ion battery pack is 4 2V and the capacity is recommended to 580mAh The capacity of battery packs down to 580mAh or more than 580mAh are allowed too z The battery pack should have a pr...

Страница 34: ...Lon Polymer battery charge protect parameter is required as following table Table 8 recommended battery protect circuit parameter Item Min Typ Max Over charge protect threshold V 4 25 4 3 4 35 Released Voltage from Over charge V 4 1 4 2 Over discharge protect threshold V 2 2 2 35 Released Voltage from Over discharge V 2 35 2 4 2 45 3 5 2 Recommended battery pack Following is the spec of recommende...

Страница 35: ... is driven by an external voltage this pin can be used to detect a external charger supply and provide most charging current through the GSM part of the module to battery when charging is in fast charge state The module VBAT pin give out charging current from the GSM part of the module to external battery TEMP_BAT pin is used for measuring the battery temperature Just let this pin open if battery ...

Страница 36: ...odule will enter fast charge state Fast charge controlled by the software Fast charge delivers a strong and constant current about 450mA through VBAT pin to the battery until battery voltage reach 4 2V Trickle charge After fast charging the battery voltage is approach the whole battery capacity voltage trick charge begins in this state the GSM part of the module charge the battery under constant v...

Страница 37: ...s connected and there is data in transfer Then the GSM part of the module will exit the SLEEP mode GHOST Mode Connect charger to module s VCHG pin while the GSM part of the module is in POWER DOWN mode IMPORTANT In GHOST mode not all the software tasks are running z Battery can be charged when GSM engine is not registered to GSM network z Only a few AT commands is available as listed below Note VB...

Страница 38: ... 1ms when charging current is switched off A 1 6A peak current is allowed for maximum 1ms when charging current is switched on 3 6 Power saving There are two methods for the module to enter into low current consumption status AT CFUN is used to set module into minimum functionality mode and DTR hardware interface signal can be used to lead system to be in SLEEP mode or slow clocking mode 3 6 1 Min...

Страница 39: ...er or exit the SLEEP mode in customer applications through DTR signal When DTR is in high level and there is no on air and hardware interrupt such as GPIO interrupt or data on serial port the GSM part of the module will enter SLEEP mode automatically In this mode the GSM part of the module can still receive paging or SMS from network In SLEEP mode the serial port is not accessible Note For some sp...

Страница 40: ... Connect charger to VCHG and connect battery to VBAT No direct transition but via Ghost mode or Normal mode Switch on from POWER DOWN mode by RTC Normal mode AT CPOWD or use PWRKEY pin Connect charger to VCHG and connect battery to VBAT then switch off module by AT CPOWD or using PWRKEY Connect charger to VCHG pin of module and connect battery to VBAT pin of module Set alarm by AT CALARM and then ...

Страница 41: ...ply of module can be provided by an external capacitor or a battery rechargeable or non chargeable through PIN 11 on the board to board connector There is a 10K resistance has been integrated in the GSM part of the module used for limiting current You need only a coin cell battery or a super cap to PIN 11 to backup power supply for RTC Note The VRTC couldn t be designed to a NC pin in your circuit...

Страница 42: ...hargeable Lithium coin cells such as the TC614 from Maxell or the TS621 from Seiko are also small in size but have higher capacity than the double layer capacitors resulting in longer backup times Typical charge curves for each cell type are shown in following figures Note that the rechargeable Lithium type coin cells generally come pre charged from the vendor ...

Страница 43: ...SIM548C Hardware Design Figure 14 Panasonic EECEMOE204A Charge Characteristic Figure 15 Maxell TC614 Charge Characteristic SIM548C_HD_V1 01 09 05 2008 43 ...

Страница 44: ...l size 6 8mm diameter and a nominal capacity of 0 2F to 0 3F giving hours of backup time 3 9 GSM Serial interface Table 13 Pin definition of the serial interfaces Name Pin Function DCD 25 Data carrier detection DTR 27 Data terminal ready RXD 29 Receive data TXD 31 Transmit data RTS 33 Request to send CTS 35 Clear to send Serial port RI 37 Ring indicator DBG_RXD 36 Receive data Debug port DBG_TXD 3...

Страница 45: ...e following signal as following figure shows Autobauding supports baud rate from 4800bps to 115200bps Serial port z TXD Send data to the RXD signal line of the DTE z RXD Receive data from the TXD signal line of the DTE Debug port z DBG_TXD Send data to the RXD signal line of the DTE z DBG_RXD Receive data from the TXD signal line of the DTE The logic levels are described in following table Table 1...

Страница 46: ...nly basic mode of multiplexing so far z Serial port supports the communication rates as following 300 1200 2400 4800 9600 19200 38400 57600 115200 Default as 115200bps z Autobauding supports baud rates as following 4800 9600 19200 38400 57600 and 115200bps Autobauding allows the GSM engine to automatically detect the baud rate configured in the host application The serial port of the GSM engine su...

Страница 47: ... as fixed baud rate the Unsolicited Result Codes like RDY should be received from the serial port all the time that GSM part of the module is power on Debug port z Two lines on Debug port z Only contains Data lines TXD and RXD z Debug Port only used for debugging It cannot be used for CSD call FAX call And the Debug port can not use multiplexing function It doesnot support autobauding function z D...

Страница 48: ... port don t support the RS232 level and it only supports the CMOS level Please refer to the table of Logic levels of serial ports pins for details about the voltage level You should add the level converter IC between the DCE and DTE If you connect it to the computer Please refer to the following figure SIM548C_HD_V1 01 09 05 2008 48 ...

Страница 49: ...Audio interface Name Pin Function MIC1P 42 Microphone1 input MIC1N 44 Microphone1 input SPK1P 41 Audio1 output AIN1 AOUT1 SPK1N 43 Audio1 output MIC2P 46 Microphone2 input MIC2N 48 Microphone2 input SPK2P 45 Audio2 output AIN2 AOUT2 SPK2N 47 Audio2 output The module provides two analogy input channels AIN1 and AIN2 which may be used for both microphone and line inputs The electret microphone is re...

Страница 50: ...nnels and deactivate the other one For more details please refer to document 1 Note Use AT command AT CHFA to select_audio channel 0 AIN1 AOUT1 normal audio channel the default value is 0 1 AIN2 AOUT2 aux_audio channel It is suggested that you adopt the one of the following two matching circuits in order to improve audio performance The difference audio signals have to be layout according to diffe...

Страница 51: ...SIM548C Hardware Design Figure 22 Speaker interface with amplifier configuration 3 10 2 Microphone interfaces configuration Figure 23 Microphone interface configuration SIM548C_HD_V1 01 09 05 2008 51 ...

Страница 52: ... 3 10 4 Referenced electronic characteristic Table 16 MIC Input Characteristics Table 17 SPK Output Characteristics Parameter Min Typ Max Unit Parameter Min Typ Max Unit Working Voltage 1 2 1 5 2 0 V Working Current 200 500 uA External Microphone Load Resistance 1 2 2 2 k Ohms SIM548C_HD_V1 01 09 05 2008 52 ...

Страница 53: ...ion please refer to document 1 The SIM interface supports the functionality of the GSM Phase 1 specification and also supports the functionality of the new GSM Phase 2 specification for FAST 64 kbps SIM intended for use with a SIM application Tool kit Both 1 8V and 3 0V SIM Cards are supported The SIM interface is powered from an internal regulator in the module having normal voltage 3V All pins r...

Страница 54: ...rface We recommend an Electro Static discharge device ST www st com ESDA6V1W5 or ON SEMI www onsemi com SMF05C for ESD ANTI The SIM_PRESENCE pin is used for detecting the SIM card removal You can use the AT command AT CSDT to set the SIMCARD configuration For detail of this AT command please refer to document 1 You can select the 8 pins SIM card holder The reference circuit about 8 pins SIM card h...

Страница 55: ...terface reference circuit with 6 pin SIM card 3 11 2 Design considerations for SIM card holder For 6 pin SIM card holder we recommend to use Amphenol C707 10M006 512 2 You can visit http www amphenol com for more information about the holder Figure 27 Amphenol C707 10M006 512 2 SIM card holder SIM548C_HD_V1 01 09 05 2008 55 ...

Страница 56: ...ode one is 3 0V 10 another is 1 8V 10 Current is about 10mA C2 SIM_RST SIM Card Reset C3 SIM_CLK SIM Card Clock C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SIM Card data I O For 8 pin SIM card holder we recommend to use Molex 91228 You can visit http www molex com for more information about the holder Figure 28 Molex 91228 SIM card holder SIM548C_HD_V1 01 09 05 2008 56 ...

Страница 57: ... interface that supports serial communication with LCD device These are composite pins that can be used as GPIO ports or LCD display interface according to your application When use as LCD interface the following table is the pin description LCD interface timing should be united with the LCD device Table 21 Pin definition of the LCD interface Name Pin Function DISP_DATA 28 Display data output DISP...

Страница 58: ...p Max Units Voltage range 0 2 4 V ADC Resolution 16 16 bits ADC accuracy 1 0 59 mV Sampling rate 5 Sec 1 ADC accuracy 12bits 3 14 General purpose input output GPIO Table 23 Pin description of the GPIO interface Pin Name Function 34 GPIO0 General Purpose Input Output Port 22 GPIO1 General Purpose Input Output Port Note This function is not supported in the default firmware There must be special fir...

Страница 59: ... Use AT command ATH the RI changes to HIGH SMS When receive SMS The RI will change to LOW and hold low level about 120ms then change to HIGH URC Some URCs triggers 120ms low level on RI For more details please refer to document 12 If the module is used as caller the RI on the board to board connector However when it is used as receiver following is timing of RI Figure 29 The GSM part Services as R...

Страница 60: ... not running 64ms On 800ms Off The GSM part of the module does not find the network 64ms On 3000ms Off The GSM part of the module find the network 64ms On 300ms Off GPRS communication We provide a reference circuitry for you shown as the following figure Figure 31 Reference circuit of NETLIGHT 3 17 Buzzer The BUZZER on the board to board connector can be used to drive a buzzer to indicate incoming...

Страница 61: ... as following figure Figure 32 Reference circuit of Buzzer Table 26 Buzzer Output Characteristics Parameter Min Typ Max Unit Working Voltage 2 4 2 8 3 3 V Working Current 2 mA Load Resistance 1 k Ohms SIM548C_HD_V1 01 09 05 2008 61 ...

Страница 62: ...enna input to serial position data output The processing steps involved are RF section In the RF section the GPS signal detected by the antenna is amplified filtered and converted to an intermediate frequency IF An A D converter converts the analogue intermediate frequency into a digital IF signal GPS channels The received digital IF signal bit stream is passed to the baseband section where it is ...

Страница 63: ...ta Power consumption 180mW with active antenna continuous mode 150mw with Passive antenna continuous mode Push to Fix reduces power by as much as 98 Note The operation of Push to Fix mode please refer to document 2 Protocols SiRF binary NMEA 0183 AI3 F SIRF Interface for AGPS RTCM for DGPS Position accuracy Autonomous 10m SBAS WASS EGNOS 5m Beacon DGPS 3m Receiver Tracking L1 C A code Channels 20 ...

Страница 64: ...mobile telecommunication network AGPS support based on the AGPS firmware Now the standard version of the firmware in the module does not support AGPS 4 3 Pin description Table 27 Pin definition Power Supply PIN NAME I O DESCRIPTION GPS_VCC I GPS_VCC pins of the board to board connector are dedicated to connect the supply voltage The power supply for GPS whole part has to be a single voltage source...

Страница 65: ...DC CHARACTERISTICS GPS_TXA O Serial data output for port A GPS_RXA I Serial data input for port A GPS_TXB O Serial data output for port B GPS_RXB I Serial data input for port B VILmin 0 3V VILmax 0 84V VIHmin 1 96V VIHmax 3 1 VOLmin GND VOLmax 0 7V VOHmin 2 1V VOHmax 2 8V Control signals PIN NAME I O DESCRIPTION GPS_BOOTSEL I For re programming the Flash it must be set to High GPS_M RST I Reset pi...

Страница 66: ...d through a 0R resistor Table 28 Consolidated PIN Characteristics PIN Default Direction GPS_TXA O GPS_RXA I GPS_TXB O GPS_RXB I 4 4 Turn on the GPS part To turn on the GPS module the GPS_VCC must be higher than 2 3V and should be kept on for 220ms at least The theory of turning on is shown in the following figure SIM548C_HD_V1 01 09 05 2008 66 ...

Страница 67: ...C is very important for the GPS module because the data kept in the SRAM is depended on the VRTC Please keep the VRTC on if you want to use the function of hotstart warmstart or Push To Fix mode There is a RTC LDO in our SIM548C module it can provide 1 5V voltage to the SRAM The theory of RTC circuit is shown in the following figure ...

Страница 68: ... then the input voltage is higher than 2 3V the RESET IC will output a low level voltage for about 220mS as a reset signal After that the reset output pin will be kept high So if the user wants to reset the module s GPS part the GPS_M RST should be pulled down longer than 10ms and then pull it up The theory of the RESET Circuit is shown in the figure Figure 36 Theory of the RESET circuit SIM548C_H...

Страница 69: ...pdate consisting of position time ephemeris data refreshing and RTC calibration When the PTF mode is enabled upon power on or a new PTF cycle the receiver will stay on full power until the good navigation solution is computed The stand by state will follow for the remainder of the period For example if it took 36 seconds to fix position and refresh ephemeris on the default period of 30 minutes the...

Страница 70: ...time and ephemeris data that the receiver has stored the external SRAM memory There are three different start up procedures 4 9 1 Coldstart The coldstart takes place when the receiver has no knowledge of its last position or time In this case the GPS RTC has not been running and no valid ephemeris data or almanac data is available The receiver has never been navigating or no battery backup memory ...

Страница 71: ...en running during that time Furthermore during the previous session the receiver must have been navigating to allow it to decode and store ephemeris data In Hotstart the receiver can announce in advance the currently visible satellites and is therefore able to quickly obtain and track the signal Due to the fact that ephemeris is already known there is no need to wait for the ephemeris broadcast to...

Страница 72: ... should be meet following requirement z GSM850 GSM900 0 5dB z DCS1800 PCS1900 1 0dB 5 1 1 GSM Antenna connector The module use MURATA s MM9329 2700 RA1 RF connector on the module side we recommend user use MURATA s MXTK92XXXXX as matching connector on the application side Please refer to appendix for detail info about MURATA s MXTK92XXXXX 5 1 2 GSM Antenna pad The antenna can be soldered to the pa...

Страница 73: ...SIM548C Hardware Design Figure 37 RF connector and RF pad The GSM part of SIM548C material properties PCB Material FR4 Antenna pad Gold plated pad SIM548C_HD_V1 01 09 05 2008 73 ...

Страница 74: ...ty of the GSM part Frequency Receive sensitivity GSM850 106dBm EGSM900 106dBm DCS1800 106dBm PCS1900 106dBm 5 1 5 Module operating frequencies Table 32 The GSM part operating frequencies Frequency Receive Transmit GSM850 869 894MHz 824 849MHz EGSM900 925 960MHz 880 915MHz DCS1800 1805 1880MHz 1710 1785MHz PCS1900 1930 1990MHz 1850 1910MHz 5 2 GPS Antenna 5 2 1 GPS Antenna Connection As same as the...

Страница 75: ... conductor with the module s GND The location of the GPS Antenna Connector and GPS antenna pad can be found in the following figure Figure 38 RF connector 5 2 2 GPS Antenna Choice Consideration To obtain excellent GPS reception performance a good antenna will always be required The antenna is the most critical item for successful GPS reception in a weak signal environment Proper choice and placeme...

Страница 76: ...ew ceramic LP antennas on the market that exhibit reasonable gain characteristics once properly mounted in the housing and when mated to an appropriate sized ground That is the key point to consider here When mated to an appropriate sized ground Usually the ground plane requirements are smaller for a LP antenna when compared to a patch but once again proper testing in an anechoic chamber is a mand...

Страница 77: ...er s design 6 Electrical reliability and radio characteristics 6 1 Absolute maximum ratings Absolute maximum rating for power supply and voltage on digital and analog pins of SIM548C are listed in table 33 and table 34 Table 33 Absolute maximum ratings GSM part Parameter Min Max Unit Peak current of power supply 0 3 0 A RMS current of power supply during one TDMA frame 0 0 7 A Voltage at digital p...

Страница 78: ...r Description Conditions Min Typ Max Unit Supply voltage Voltage must stay within the min max values including voltage drop ripple and spikes 3 4 4 0 4 5 V Voltage drop during transmit burst Normal condition power control level for Pout max 400 mV VBAT Voltage ripple Normal condition power control level for Pout max f 200kHz f 200kHz 50 2 mV Average supply current POWER DOWN mode SLEEP mode BS PA ...

Страница 79: ...PS_VCC Supply voltage 3 0 3 3 5 V IGPS_VCC Average supply current Continuous mode with antenna feeding on GPS_VCC_RF 65 110 mA Note Basing on current standard GSW3 soft version the power saving mode of GPS part is not available that results 65 mA IGPS_VCC remained while the GPS receiver is running in normal mode 6 4 Current consumption 6 4 1 The current consumption of the GSM part Table 38 Current...

Страница 80: ...l 19 Typical 142mA DCS 1800 PCS 1900 power level 0 450mA Typical 340mA power level 10 Typical 140mA power level 15 Typical 127mA DATA mode GPRS 4 Rx 1 Tx CLASS 8 EGSM 900 EGSM 850 power level 5 350mA Typical 270mA power level 10 Typical 160mA power level 19 Typical 120mA DCS 1800 PCS 1900 power level 0 300mA Typical 220mA power level 10 Typical 120mA power level 15 Typical 113mA Class 10 is defaul...

Страница 81: ...e user wants to save more current consumption of the GPS part he can pull down the POWER_CTRL of the MCU to stop the LDO outputting And this operation will cut off the power of the GPS part Note that the GPS_VRTC must be kept on 6 4 2 2 Push To Fix mode The circuit of this mode is shown in figure 40 SIM548C_HD_V1 01 09 05 2008 81 ...

Страница 82: ...is 30 minutes by default but can be anywhere between 10 seconds and 2 hours When the PTF mode is enabled upon power on or a new PTF cycle the receiver will stay on full power until the good navigation solution is computed The stand by state will follow for the remainder of the period If it took 36 seconds to fix position and refresh ephemeris on the default period of 30 minutes the receiver will s...

Страница 83: ... Fix mode the RTC battery must be 2 5V If the RTC battery level is lower than 2 5V the module will not go into PTF mode 2 Push To Fix mode is only available in protocol of SiRF binary please refer to the document 2 6 5 Electrostatic discharge The GSM engine is not protected against Electrostatic Discharge ESD in general Therefore it is subject to ESD handing precautions that typically apply to ESD...

Страница 84: ... The ESD endure statue measured table Temperature 25 Humidity 45 Part Contact discharge Air discharge VBAT GND 6KV 10KV DTR RXD TXD RTS DISP_DATA DISP_CLK 4KV 10KV Antenna port 4KV 8KV Other port 4KV 8KV SIM548C_HD_V1 01 09 05 2008 84 ...

Страница 85: ...echanics This chapter describes the mechanical dimensions of SIM548C 7 1 Mechanical dimensions Following shows the Mechanical dimensions of SIM548C Figure 42 Mechanical dimensions of module Unit mm SIM548C_HD_V1 01 09 05 2008 85 ...

Страница 86: ... application platform Use the connector ASTRON1491060 09T R and four pads to fix the SIM548C onto customer platform 7 3 Board to board connector We recommend ASTRON Company s1491060 09T R and 1590060 09T R as the board to board connector These high density SMT connectors are designed for parallel PCB to PCB applications SIM548C_HD_V1 01 09 05 2008 86 ...

Страница 87: ...9T R Figure 45 ASTRON1590060 09T R Board to Board connector Figure 46 ASTRON Board to Board connector physical photo Note The connector ASTRON ASTRON1491060 09T R is used in pin side 548C module and 1590060 09T R is used in socket side user side SIM548C_HD_V1 01 09 05 2008 87 ...

Страница 88: ...SIM548C Hardware Design 7 3 2 Adapter cabling Figure 47 MM9329 2700B Figure 48 RF connector MXTK For more information about the connector please visit http www murata com SIM548C_HD_V1 01 09 05 2008 88 ...

Страница 89: ...O 20 STATUS O 21 SIM_DATA I O 22 GPIO1 I O 23 SIM_CLK O 24 DISP_CS O 25 DCD O 26 DISP_CLK O 27 DTR I 28 DISP_DATA I O 29 RXD I 30 DISP_D C O 31 TXD O 32 DISP_RST O 33 RTS I 34 GPIO0 I O 35 CTS O 36 DBG_RXD I 37 RI O 38 DBG_TXD O 39 AGND 40 AGND 41 SPK1P O 42 MIC1P I 43 SPK1N O 44 MIC1N I 45 SPK2P O 46 MIC2P I 47 SPK2N O 48 MIC2N I 49 GPS_M RST I 50 GPS_BOOTSEL I 51 GPS_TXA O 52 GPS_TIMEMAR K O 53 ...

Страница 90: ...SIM548C Hardware Design The following figure is a top view of SIM548C module With the indication of Pin 1 2 59 and 60 Figure 49 physical SIM548C SIM548C_HD_V1 01 09 05 2008 90 ...

Страница 91: ...48C Hardware Design APPENDIX B Reference Circuit with external MCU GPS standalone application Figure 50 Reference Circuit with external MCU standalone application for example SIM548C_HD_V1 01 09 05 2008 91 ...

Страница 92: ...ith external MCU AGPS application The next Figure shows the connection for AGPS application DISP_DATA pin is used for TX and DISP_D C for RX For details please refer to AGPS application note document Figure 51 AGPS connection SIM548C_HD_V1 01 09 05 2008 92 ...

Страница 93: ...Contact us Shanghai SIMCom Wireless Solutions Ltd Add SIM Technology Building No 700 Yishan Road Shanghai P R China 200233 Tel 86 21 5427 8900 Fax 86 21 5427 6035 URL www sim com wm ...

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