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AC75 Hardware Interface Description 

Strictly confidential / Preliminary  

s

 

AC75_HD_V00.202 

Page 78 of 120 

27.04.2006 

4 Antenna 

Interface 

The RF interface has an impedance of 50

Ω

. AC75 is capable of sustaining a total mismatch 

at the antenna connector without any damage, even when transmitting at maximum RF 
power. 
 
The external antenna must be matched properly to achieve best performance regarding 
radiated power, DC-power consumption, modulation accuracy and harmonic suppression. 
Antenna matching networks are not included on the AC75 PCB and should be placed in the 
host application.  
 
Regarding the return loss AC75 provides the following values in the active band: 

Table 17: Return loss in the active band

 

State of module 

Return loss of module 

Recommended return loss of application 

Receive > 8dB 

> 12dB  

Transmit  

not applicable  

> 12dB  

 
 
 

Summary of Contents for AC75

Page 1: ...Hardware Interface Description AC75 Siemens Cellular Engine Version 00 202 DocID AC75_HD_V00 202 s ...

Page 2: ...to be in accordance with the technical specifications provided in these guidelines Failure to comply with any of the required procedures can result in malfunctions or serious discrepancies in results Furthermore all safety instructions regarding the use of mobile technical systems including GSM products which also apply to cellular phones must be followed Siemens AG customers using or selling this...

Page 3: ... Signal to Reset Application s or External Device s 31 3 3 2 Signal States after Startup 32 3 3 3 Turn off AC75 34 3 3 3 1 Turn off AC75 Using AT Command 34 3 3 3 2 Leakage Current in Power Down Mode 35 3 3 3 3 Turn on off AC75 Applications with Integrated USB 36 3 3 4 Automatic Shutdown 37 3 3 4 1 Thermal Shutdown 37 3 3 4 2 Deferred Shutdown at Extreme Temperature Conditions 38 3 3 4 3 Monitorin...

Page 4: ...unter 74 3 17 Control Signals 75 3 17 1 Synchronization Signal 75 3 17 2 Using the SYNC Pin to Control a Status LED 76 3 17 3 Behavior of the RING0 Line ASC0 Interface only 77 3 17 4 PWR_IND Signal 77 4 Antenna Interface 78 4 1 Antenna Diagnostic 79 4 2 Antenna Connector 80 5 Electrical Reliability and Radio Characteristics 82 5 1 Absolute Maximum Ratings 82 5 2 Operating Temperatures 83 5 3 Stora...

Page 5: ...iring of ASC0 54 Table 14 DCE DTE wiring of ASC1 55 Table 15 Configuration combinations for the PCM interface 69 Table 16 Overview of DAI pin functions 70 Table 17 Return loss in the active band 78 Table 18 Values of the AT SAD parameter diag and their meaning 79 Table 19 Product specifications of Rosenberger SMP connector 80 Table 20 Absolute maximum ratings 82 Table 21 Board temperature 83 Table...

Page 6: ...PI interface 61 Figure 22 Characteristics of SPI modes 62 Figure 23 Audio block diagram 63 Figure 24 Single ended microphone input 65 Figure 25 Differential microphone input 66 Figure 26 Line input configuration with OpAmp 67 Figure 27 Differential loudspeaker configuration 68 Figure 28 Master PCM interface Application 70 Figure 29 Short Frame PCM timing 71 Figure 30 Long Frame PCM timing 71 Figur...

Page 7: ...T line must be pulled low for at least 1s and then released High state of IGT lets AC75 enter Normal mode 3 5 4 Replaced recommended polymer battery with new VARTA PoLiFlex battery 3 5 7 3 7 Described transition from Charge only to Normal mode by switching off Airplane mode 3 6 Added chapter on power saving 3 12 AC75 does not support generic USB 2 0 High Speed hubs 3 15 2 2 Added remarks on VMIC b...

Page 8: ...ion on the requirements to be considered for integrating further components 1 1 Related Documents 1 AC75 AT Command Set 00 202 2 AC75 Release Notes 00 202 3 DSB75 Support Box Evaluation Kit for Siemens Cellular Engines 4 Application 07 Rechargeable Lithium Batteries in GSM Applications 5 Multiplexer User s Guide 6 Multiplex Driver Developer s Guide for Windows 2000 and Windows XP 7 Multiplex Drive...

Page 9: ...nformity CHAP Challenge Handshake Authentication Protocol CPU Central Processing Unit CS Coding Scheme CSD Circuit Switched Data CTS Clear to Send DAC Digital to Analog Converter DAI Digital Audio Interface dBm0 Digital level 3 14dBm0 corresponds to full scale see ITU G 711 A law DCE Data Communication Equipment typically modems e g Siemens GSM engine DCS 1800 Digital Cellular System also referred...

Page 10: ...anization ITU International Telecommunications Union kbps kbits per second LED Light Emitting Diode Li Ion Li Lithium Ion Li battery Rechargeable Lithium Ion or Lithium Polymer battery Mbps Mbits per second MMI Man Machine Interface MO Mobile Originated MS Mobile Station GSM engine also referred to as TE MSISDN Mobile Station International ISDN number MT Mobile Terminated NTC Negative Temperature ...

Page 11: ... Short Message Service SPI Serial Peripheral Interface SRAM Static Random Access Memory TA Terminal adapter e g GSM engine TDMA Time Division Multiple Access TE Terminal Equipment also referred to as DTE Tx Transmit Direction UART Universal asynchronous receiver transmitter URC Unsolicited Result Code USB Universal Serial Bus USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave ...

Page 12: ...h the CE conformity mark 89 336 EC Directive on electromagnetic compatibility 73 23 EC Directive on electrical equipment designed for use within certain voltage limits Low Voltage Directive 95 94 EC Automotive EMC directive 2002 95 EC Directive of the European Parliament and of the Council of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic...

Page 13: ... Forum Certification Criteria ETSI EN 301 489 1 V1 4 1 Candidate Harmonized European Standard Telecommunications series Electro Magnetic Compatibility and Radio spectrum Matters ERM Electro Magnetic Compatibility EMC standard for radio equipment and services Part 1 Common Technical Requirements ETSI EN 301 489 7 V1 2 1 2000 09 Candidate Harmonized European Standard Telecommunications series Electr...

Page 14: ...ecautions must be observed during all phases of the operation usage service or repair of any cellular terminal or mobile incorporating AC75 Manufacturers of the cellular terminal are advised to convey the following safety information to users and operating personnel and to incorporate these guidelines into all manuals supplied with the product Failure to comply with these precautions violates safe...

Page 15: ...d cellular terminal or mobile when driving a vehicle unless it is securely mounted in a holder for speakerphone operation Before making a call with a hand held terminal or mobile park the vehicle Speakerphones must be installed by qualified personnel Faulty installation or operation can constitute a safety hazard IMPORTANT Cellular terminals or mobiles operate using radio signals and cellular netw...

Page 16: ...cording to Release 99 Version 5 the maximum output power in a multislot configuration may be lower The nominal reduction of maximum output power varies with the number of uplink timeslots used and amounts to 3 0dB for 2Tx 4 8dB for 3Tx and 6 0dB for 4Tx Power supply 3 3V to 4 5V Ambient operating temperature according to IEC 60068 2 Normal operation 30 C to 75 C Restricted operation 30 C 85 C Phys...

Page 17: ...a applications ease of programming no need for application microcontroller extremely cost efficient hardware and software design ideal platform for industrial GSM applications The memory space available for Java programs is around 1 7 MB in the flash file system and around 400k RAM Application code and data share the space in the flash file system and in RAM SIM Application Toolkit SAT Release 99 ...

Page 18: ...ace for transmission rates up to 6 5 Mbps Programmable with AT SSPI command If the SPI is active the I C interface is not available Audio 2 analog interfaces 2 microphone inputs and 2 headphone outputs with microphone power supply 1 digital interface PCM SIM interface Supported SIM cards 3V 1 8V Antenna 50Ohms External antenna can be connected via antenna connector Antenna diagnostic Module interf...

Page 19: ...signal Phonebook SIM and phone Evaluation kit DSB75 DSB75 Evaluation Board designed to test and type approve Siemens cellular engines and provide a sample configuration for application engineering 2 2 AC75 System Overview User Application AC75 Application Interface Charger Charging circuit UART Antenna Interface SPI USB DAC USB Host ASC0 modem ASC1 SIM Digital Audio Charge Power Supply I2 C Slave ...

Page 20: ...eiver RF power amplifier RF front end Antenna connector Digital Baseband Processer with DSP BATT GND IGT EMERG_RST ASC 0 5 SIM Interface CCIN CCRST CCIO CCCLK CCVCC D 0 15 A 0 24 RD WR CS WAIT RF Control Bus Interface RF Baseband NTC BATT_TEMP VDDLP SYNC Transceiver RF Power Amplifier SRAM Flash 6 5 8 8 AC75 I Q 4 Audio analog DAC_OUT 10 USB GPIO 3 10 I2C SPI SPI 2 2 VEXT ISENSE VSENSE VCHARGE CHA...

Page 21: ...ribed in the following chapters Power supply see Section 3 1 Charger interface see Section 3 5 SIM interface see Section 3 9 Serial interface ASC0 see Section 3 10 Serial interface ASC1 see Section 3 11 Serial interface USB see Section 3 12 Serial interface I C SPI see Section 3 13 and 3 14 Two analog audio interfaces see Section 3 15 Digital audio interface DAI see Section 3 15 and 3 15 4 10 line...

Page 22: ... Once registered to the GSM network paging with BTS is carried out The module is ready to send and receive GSM TALK Connection between two subscribers is in progress Power consumption depends on network coverage individual settings such as DTX off on FR EFR HR hopping sequences antenna GPRS IDLE EGPRS IDLE Module is ready for GPRS EGPRS data transfer but no data is currently sent or received Power...

Page 23: ...h back and forth between Normal mode and Airplane mode any time during operation Setting an alarm time with AT CALA followed by AT SMSO wakes the module up into Airplane mode at the scheduled time Charge only mode Limited operation for battery powered applications Enables charging while module is detached from GSM network Limited number of AT commands is accessible Charge only mode applies when th...

Page 24: ...or your application please pay specific attention to power losses Ensure that the input voltage VBATT never drops below 3 3V on the AC75 board not even in a transmit burst where current consumption can rise to typical peaks of 2A It should be noted that AC75 switches off when exceeding these limits Any voltage drops that may occur in a transmit burst should not exceed 400mV The measurement network...

Page 25: ... Supply Voltage VBATT The reference points for measuring the supply voltage VBATT on the module are BATT and GND both accessible at a capacitor located close to the board to board connector of the module Figure 4 Position of the reference points BATT and GND 3 2 3 Monitoring Power Supply by AT Command To monitor the supply voltage you can also use the AT SBV command which returns the value related...

Page 26: ...e SYSSTART indicates that the module has entered Normal mode SYSSTART AIRPLANE MODE indicates that the module has entered Airplane mode SYSSTART CHARGE ONLY MODE indicates that the module has entered the Charge only mode These URCs are indicated only if the module is set to a fixed bit rate i e they do not appear if autobauding is enabled AT IPR 0 Detailed explanations on AT SCFG AT CFUN AT CALA A...

Page 27: ... ready state of the module we recommend using hardware flow control which can be set with AT Q or AT ICF see 1 for details The default setting of AC75 is AT Q0 no flow control which shall be altered to AT Q3 RTS CTS handshake If the application design does not integrate RTS CTS lines the host application shall wait at least for the SYSSTART or SYSSTART AIRPLANE MODE URC However if the URCs are nei...

Page 28: ...6 Power on with IGT held low before switching on operating voltage at BATT If the IGT line is driven low for less than 400ms the module will instead of starting up send only the alert message SHUTDOWN after Illegal PowerUp to the host application The alert message appears on the serial interfaces ASC0 and ASC1 at a fixed bit rate of 115200bps If other fixed bit rates or autobauding are set the URC...

Page 29: ...or use as ON OFF switch at scfg meshutdown onignition on SCFG MEShutdown OnIgnition on OK Enable the ON OFF switch mode of IGT IGT can be used to switch on and off AC75 We strongly recommend taking great care before changing the switching mode of the IGT line To ensure that the IGT line works properly as ON OFF switch it is of vital importance that the following conditions are met Switch on condit...

Page 30: ...e launched During the Charge only mode AC75 is neither logged on to the GSM network nor are the serial interfaces fully accessible To switch from Charge only mode to Normal mode the ignition line IGT must be pulled low for at least 1 second When released the IGT line goes high and causes the module to enter the Normal mode See also Section 3 5 7 3 3 1 4 Reset AC75 via AT CFUN Command To reset and ...

Page 31: ... pulled to ground for 10ms Then after releasing the EMERG_RST line the module restarts if IGT is held low for at least 400ms Otherwise if IGT is not low the module switches off In this case it can be restarted any time as described in section 3 3 1 1 After hardware driven restart notification via SYSSTART or SYSSTART AIRPLANE URC is the same as in case of restart by IGT or AT command To register t...

Page 32: ...tion by AT command Signal name Undefined state during startup Defined state after initialization GPIO SPI I 2 C DAI SYNC L O CCIN I PU 100k I PU 100k CCRST L O CCIO L O CCCLK L O CCVCC L 2 9V RXD0 I PU O TXD0 I PU I PD 330k CTS0 L O RTS0 I PU I PD 330k DTR0 I PU I DCD0 L O DSR0 L O RING0 I PU O RXD1 H O TXD1 I PD 330k I PD 330k CTS1 L O RTS1 I PD 330k I PD 330k SPIDI I Tristate I Tristate SPICS I ...

Page 33: ...ary s AC75_HD_V00 202 Page 33 of 120 27 04 2006 Abbreviations used in Table 6 L Low output level H High output level I Input O Output PD Pull down with min 15µA and max 100µA PD k Fix pull down resistor PU Pull up with min 15µA and max 100µA PU k Fix pull up resistor ...

Page 34: ...esponse SMSO MS OFF OK SHUTDOWN After sending AT SMSO do not enter any other AT commands There are two ways to verify when the module turns off Wait for the URC SHUTDOWN It indicates that data have been stored non volatile and the module turns off in less than 1 second Also you can monitor the PWR_IND pin High state of PWR_IND definitely indicates that the module is switched off Be sure not to dis...

Page 35: ... host application 3 3 3 2 Leakage Current in Power Down Mode The leakage current in Power down mode varies depending on the following conditions If the supply voltage at BATT was disconnected and then applied again without starting up the AC75 module the leakage current ranges between 90µA and 100µA If the AC75 module is started and afterwards powered down with AT SMSO then the leakage current is ...

Page 36: ...ort each time the module is restarted Restart after shutdown with AT SMSO After entering the power down command AT SMSO on one of the interfaces ASC0 ASC1 USB the host application or Terminal program used on the USB VCOM port must be closed before the module is restarted by activating the IGT line Software reset with AT CFUN x 1 Likewise when using the reset command AT CFUN x 1 on one of the inter...

Page 37: ... is constantly monitored by an internal NTC resistor located on the PCB The NTC that detects the battery temperature must be part of the battery pack circuit as described in 3 5 3 The values detected by either NTC resistor are measured directly on the board or the battery and therefore are not fully identical with the ambient temperature Each time the board or battery temperature goes out of range...

Page 38: ...powerup This guard period has been introduced in order to allow the user to make an emergency call or a call to a phone number predefined with the AT SCTM command see Error Reference source not found for details The start of any of these calls extends the guard period until the end of the call Any other network activity may be terminated by shutdown upon expiry of the guard time If the temperature...

Page 39: ...voltage Shutdown if no Battery NTC is Present The undervoltage protection is also effective in applications where no NTC connects to the BATT_TEMP terminal Thus you can take advantage of this feature even though the application handles the charging process or AC75 is fed by a fixed supply voltage All you need to do is executing the write command AT SBC current which automatically enables the prese...

Page 40: ...lot Class If the temperature stays at the critical level or even continues to rise AC75 will not switch back to the higher class After a transition from EGPRS Multislot Class 10 to EGPRS Multislot Class 8 a possible switchback to EGPRS Multislot Class 10 is blocked for one minute The same applies when a transition occurs from GPRS Multislot Class 12 or 10 to GPRS Multislot Class 8 Please note that...

Page 41: ... within your application according to the Figure 46 3 5 2 Software Requirements Use the command AT SBC parameter current to enter the current consumption of the host application This information enables the AC75 module to correctly determine the end of charging and terminate charging automatically when the battery is fully charged If the current value is inaccurate and the application draws a curr...

Page 42: ...o NTC is present Ensure that the pack incorporates a protection circuit capable of detecting overvoltage protection against overcharging undervoltage protection against deep discharging and overcurrent Due to the discharge current profile typical of GSM applications the circuit must be insensitive to pulsed current On the AC75 module a built in measuring circuit constantly monitors the supply volt...

Page 43: ...5 When you choose a battery for your AC75 application you can take advantage of one of the following two batteries offered by VARTA Microbattery GmbH Both batteries meet all requirements listed above They have been thoroughly tested by Siemens proved to be suited for AC75 and are CE approved LIP 633450A1B PCM STB type Lithium Ion This battery is listed in the standard product range of VARTA It is ...

Page 44: ...ftware controlled charging Controlled over the CHARGEGATE Temperature conditions 0 C to 45 C Software controlled charging is done when the charger is present connected to VCHARGE and the battery voltage is at least above the undervoltage threshold Software controlled charging passes the following stages Power ramp Depending on the discharge level of the battery i e the measured battery voltage VBA...

Page 45: ...ture In these cases you can only switch the module off by disconnecting the charger To proceed from Charge only mode to another operating mode you have the following options provided that the battery voltage is at least above the undervoltage threshold To switch from Charge only mode to Normal mode you have two ways Hardware driven The ignition line IGT must be pulled low for at least 1 second Whe...

Page 46: ...r level PCL5 and GPRS Class 12 at the same time the current consumption is higher than the current supplied by the charger Charge only mode Connect charger to charger input of host application charging circuit and module s VCHARGE pin while AC75 is in Power down mode in Normal mode Connect charger to the VCHARGE pin then enter AT SMSO NOTE While trickle charging is in progress be sure that the hos...

Page 47: ...to use hardware flow control This is necessary since the CTSx signal is set reset every 0 9 2 7 seconds in order to indicate to the application when the UART is active Please refer to 1 for details on how to configure hardware flow control for the AC75 Note Although not explicitly stated all explanations given in this section refer equally to ASC0 and ASC1 and accordingly to CTS0 and CTS1 or RTS0 ...

Page 48: ...t 2 seconds RTSx has to be asserted for at least a dedicated debounce time in order to wake up the ME The debounce time specifies the minimum time period an RTSx signal has to remain asserted for the signal to be recognized as wake up signal and being processed The debounce time is defined as 8 4 615 ms TDMA frame duration and is used to prevent bouncing or other fluctuations from being recognized...

Page 49: ...ode Airplane OnStart on IGT 400 ms at low level then release IGT Regardless of AT SCFG configuration scheduled wake up set with AT CALA Normal mode AT SMSO AT SMSO if charger is connected AT SCFG MeOpMode Airplane on If AT SCFG MeOpMode Airplane OnStart on AT CFUN x 1 or EMERG_RST IGT 400 ms Charge only mode Disconnect charger Hardware driven If AT SCFG MeOpMode Airplane OnStart off IGT 1s at low ...

Page 50: ... charged by the BATT line of AC75 If the voltage supply at BATT is disconnected the RTC can be powered by the capacitor The size of the capacitor determines the duration of buffering when no voltage is applied to AC75 i e the larger the capacitor the longer AC75 will save the date and time A serial 1kΩ resistor placed on the board next to VDDLP limits the charge current of an empty capacitor or ba...

Page 51: ...8 for Molex ordering numbers Table 12 Signals of the SIM interface board to board connector Signal Description CCGND Separate ground connection for SIM card to improve EMC Be sure to use this ground line for the SIM interface rather than any other ground pin or plane on the module A design example for grounding the SIM interface is shown in Figure 46 CCCLK Chipcard clock various clock rates can be...

Page 52: ...er to meet the specifications of 3GPP TS 51 010 1 and to satisfy the requirements of EMC compliance To avoid possible cross talk from the CCCLK signal to the CCIO signal be careful that both lines are not placed closely next to each other A useful approach is using the CCGND line to shield the CCIO line from the CCCLK line To meet EMC requirements it is strongly recommended to add several capacito...

Page 53: ...S data and for controlling the GSM engine with AT commands Full Multiplex capability allows the interface to be partitioned into three virtual channels yet with CSD and fax services only available on the first logical channel Please note that when the ASC0 interface runs in Multiplex mode ASC1 cannot be used For more details on Multiplex mode see 5 The DTR0 signal will only be polled once per seco...

Page 54: ...e 13 DCE DTE wiring of ASC0 DCE DTE V 24 circuit Pin function Signal direction Pin function Signal direction 103 TXD0 Input TXD Output 104 RXD0 Output RXD Input 105 RTS0 Input RTS Output 106 CTS0 Output CTS Input 108 2 DTR0 Input DTR Output 107 DSR0 Output DSR Input 109 DCD0 Output DCD Input 125 RING0 Output RING Input ...

Page 55: ...module s TXD1 signal line Port RXD application receives data from the module s RXD1 signal line Figure 17 Serial interface ASC1 Features Includes only the data lines TXD1 and RXD1 plus RTS1 and CTS1 for hardware handshake On ASC1 no RING line is available The indication of URCs on the second interface depends on the settings made with the AT SCFG command For details refer to 1 Configured for 8 dat...

Page 56: ...wnloading firmware The USB I O pins are capable of driving the signal at min 3 0V They are 5V I O compliant To properly connect the module s USB interface to the host a USB 2 0 compatible connector is required Furthermore the USB modem driver delivered with AC75 must be installed as described below The USB host is responsible for supplying across the VUSB_IN line power to the module s USB interfac...

Page 57: ...where the usbmodem inf file is located Windows will copy the required software to your computer and configure the modem by assigning a free COM port If you are already using more than one COM port then the next free one will be allocated Click Finish to complete the installation Notes for Windows 2000 only During the installation procedure you will be prompted for the usbser sys driver Make sure t...

Page 58: ... to assign the next free COM port to AC75 and for example allocates a COM port already used by another modem you can manually select a free port as follows Open the Windows Device Manager select the installed Siemens AG WM USB Modem click Properties select the Advanced tab and click Advanced Port settings From the listbox COM Port Number choose a free port To make the changes take effect disconnec...

Page 59: ...I2CCLK and I2DAT are locked for use as SPI lines Vice versa the activation of the SPI locks both lines for I2 C Detailed information on the AT SSPI command as well explanations on the protocol and syntax required for data transmission can be found in 1 The I2 C interface can be powered from an external supply or via the VEXT line of AC75 If connected to the VEXT line the I2 C interface will be pro...

Page 60: ... 27 04 2006 GSM module I2CDAT I2CCLK GND I2CDAT I2CCLK GND Application VEXT Rp Rp Figure 20 I2 C interface connected to VEXT line of AC75 Note Good care should be taken when creating the PCB layout of the host application The traces of I2CCLK and I2CDAT should be equal in length and as short as possible ...

Page 61: ...ule and vice versa The SPI interface uses two independent lines for data input SPIDI and data output SPIDO GSM module Application SPICLK SPICLK SPICS SPICS SPIDO SPIDI SPIDI SPIDO Figure 21 SPI interface To configure and activate the SPI bus use the AT SSPI command If the SPI bus is active the two lines I2CCLK and I2DAT are locked for use as I2 C lines Detailed information on the AT SSPI command a...

Page 62: ...5_HD_V00 202 Page 62 of 120 27 04 2006 SPI MODE 0 SPI MODE 1 SPI MODE 2 SPI MODE 3 Clock phase Clock polarity SPICS SPIDO SPICLK SPIDI SPICS SPIDO SPICLK SPIDI SPICS SPIDO SPICLK SPIDI SPICS SPIDO SPICLK SPIDI Sample Sample Sample Sample Figure 22 Characteristics of SPI modes ...

Page 63: ...he audio interfaces can be configured for different audio modes via the AT SNFS command The electrical characteristics of the voiceband part vary with the audio mode For example sending and receiving amplification sidetone paths noise suppression etc depend on the selected mode and can be altered with AT commands except for mode 1 Both analog audio interfaces can be used to connect headsets with m...

Page 64: ...uit except for the internal voltage supply VMIC and the dedicated audio ground line AGND Both lines are well suited to feed a balanced audio application or a single ended audio application The AGND line on the AC75 board is especially provided to achieve best grounding conditions for your audio application As there is less current flowing than through other GND lines of the module or the applicati...

Page 65: ...s the microphone falls into the bias voltage range of 1 0V to 1 6V and the microphone feeding current meets its specification The MICNx input is automatically self biased to the MICPx DC level It is AC coupled via CK to a resistive divider which is used to optimize supply noise cancellation by the differential microphone amplifier in the module The VMIC voltage should be filtered if gains larger t...

Page 66: ...ler than Vpp 0 5V VMIC can be used to generate the MICP pin bias voltage as shown below In this case the bias voltage is only applied if VMIC is switched on Only if VMIC is switched on can the voltage applied to any MIC pin be in the range of 2 4V to 0V If these limits are exceeded undervoltage shutdown may be caused Consider that the maximum full scale input voltage is Vpp 1 6V The behavior of VM...

Page 67: ...er between VMIC and AGND is necessary to bias the input amplifier MICNx is automatically self biased to the MICPx DC level The VMIC voltage should be filtered if gains larger than 20dB are used The filter can be attached as a simple first order RC network RVMIC and CF If a high input level and a lower gain are applied the filter is not necessary Consider that if VMIC is switched off the signal vol...

Page 68: ...1 and EP2 Output EP1 is able to drive a load of 8Ohms while the output EP2 can drive a load of 32Ohms Each interface can be connected in differential and in single ended configuration Figure 27 shows an example of a differential loudspeaker configuration GSM module AGND EPNx EPPx Figure 27 Differential loudspeaker configuration Loudspeaker impedance EPP1 EPN1 ZL typ 8Ohm EPP2 EPN2 ZL typ 32Ohm ...

Page 69: ...equency For the PCM interface configuration the parameters clock mode and framemode of the AT SAIC command are used The following table lists possible combinations Table 15 Configuration combinations for the PCM interface Configuration clock mode framemode Master 256kHz short frame 0 0 0 Master 256kHz long frame 0 0 1 Master 512kHz short frame 1 0 0 Master 512kHz long frame 1 0 1 Slave 256kHz shor...

Page 70: ... I DAI2 FS Frame sync Master O DAI3 BITCLK Master O DAI4 FSIN Slave I DAI5 BCLKIN Slave I DAI6 nc I 3 15 4 1 Master Mode To clock input and output PCM samples the PCM interface delivers a bit clock BITCLK which is synchronous to the GSM system clock The frequency of the bit clock is 256kHz or 512kHz Any edge of this clock deviates less than 100ns Jitter from an ideal 256 kHz clock respective 512 k...

Page 71: ...lication is sampled at the falling edge of BITCLK BITCLK TXDAI RXDAI FS MSB MSB LSB LSB 14 13 14 13 1 1 12 12 2 2 MSB MSB 125 µs Figure 29 Short Frame PCM timing The timing of a PCM long frame is shown in Figure 30 16 bit data are transferred in both directions at the same time during the frame sync pulse FS is high For this reason the duration of a frame sync pulse is 16 BITCLK periods starting a...

Page 72: ... from the internal frame rate must not exceed 125ppm The internal frame rate of nominal 8kHz is synchronized to the GSM network The difference between the internal and the external frame rate is equalized by doubling or skipping samples This happens for example every second if the difference is 125ppm The resulting distortion can be neglected in speech signals The pins BITCLK and FS remain low in ...

Page 73: ...202 Page 73 of 120 27 04 2006 BCLKIN TXDAI RXDAI FSIN MSB MSB LSB LSB 14 13 14 13 1 1 12 12 2 2 MSB MSB 125 µs Figure 32 Slave PCM Timing Short Frame selected BCLKIN TXDAI RXDAI FSIN MSB MSB LSB LSB 14 13 14 13 1 1 12 12 2 2 MSB MSB 125 µs Figure 33 Slave PCM Timing Long Frame selected ...

Page 74: ...be configured and operated as pulse counter Both functions exclude each other The pulse counter disables the GPIO functionality and vice versa the GPIO functionality disables the pulse counter Detailed AT command descriptions can be found in 1 The pulse counter is designed to measure signals from 0 to 1000 pulses per second It can be operated either in Limit counter mode or Start Stop mode Dependi...

Page 75: ...ion factory default AT SSYNC 0 is recommended if you want your application to use the synchronization signal for better power supply control Your platform design must be such that the incoming signal accommodates sufficient power supply to the AC75 module if required This can be achieved by lowering the current drawn from other components installed in your application The timing of the synchroniza...

Page 76: ...st be connected to the host application The connected LED can be operated in two different display modes AT SSYNC 1 or AT SSYNC 2 For details please refer to 1 Especially in the development and test phase of an application system integrators are advised to use the LED mode of the SYNC pin in order to evaluate their product design and identify the source of errors To operate the LED a buffer e g a ...

Page 77: ...urrent consumption Therefore utilizing the RING0 line provides an option to significantly reduce the overall current consumption of your application The behavior of the RING0 line varies with the type of event When a voice fax data call comes in the RING0 line goes low for 1s and high for another 4s Every 5 seconds the ring string is generated and sent over the RXD0 line If there is a call in prog...

Page 78: ...The external antenna must be matched properly to achieve best performance regarding radiated power DC power consumption modulation accuracy and harmonic suppression Antenna matching networks are not included on the AC75 PCB and should be placed in the host application Regarding the return loss AC75 provides the following values in the active band Table 17 Return loss in the active band State of mo...

Page 79: ...ing procedure and the measuring result A peak deviation Vdisturb of 0 8V from ground is acceptable Vdisturb peak 0 8V maximum fdisturb 0Hz 5kHz Waveform DC sinus square pulse peak pulse width 100µs Rdisturb 5Ω Figure 38 Resistor measurement used for antenna detection Table 18 Values of the AT SAD parameter diag and their meaning Antenna connection status indicated by AT SAD diag Equivalent ranges ...

Page 80: ...µm NiP plating Dielectric PTFE Electrical ratings Nominal Impedance 50 Ω Operating frequency DC 2 GHz VSWR 1 10 DC to 2 GHz Insertion loss 0 1 dB x f GHz Center contact resistance max 6 mΩ Outer contact resistance max 2 mΩ Insulation resistance 5 GΩ Working voltage 335 V rms at sea level Dielectric withstanding voltage 500 V rms at sea level Mechanical ratings Durability 30 mating cycles Engagemen...

Page 81: ...AC75 Hardware Interface Description Strictly confidential Preliminary s AC75_HD_V00 202 Page 81 of 120 27 04 2006 Figure 39 Datasheet of Rosenberger SMP MIL Std 348 A connector ...

Page 82: ...upply voltage BATT 0 3 5 5 V Voltage at digital pins in POWER DOWN mode 0 3 0 3 V Voltage at digital pins in normal operation 0 3 3 05 or VEXT 0 3 V Voltage at analog pins in POWER DOWN mode 0 3 0 3 V Voltage at analog pins VMIC on4 0 3 2 75 V Voltage at analog pins VMIC off4 0 3 0 3 V Voltage at VCHARGE pin 0 3 5 5 V Voltage at CHARGEGATE pin 0 3 5 5 V VUSB_IN 0 3 5 5 V USB_DP USB_DN 0 3 3 5 V VS...

Page 83: ...ion about the NTCs for on board and battery temperature measurement automatic thermal shutdown and alert messages When data are transmitted over EGPRS or GPRS the AC75 automatically reverts to a lower Multislot Class if the temperature increases to the limit specified for normal operation and vice versa returns to the higher Multislot Class if the temperature is back to normal For details see Chap...

Page 84: ...High Condens 10 90 at 30 C 90 100 at 30 C ETS 300 019 2 1 T1 2 IEC 68 2 56 Cb ETS 300 019 2 1 T1 2 IEC 68 2 30 Db Air pressure Low High 70 106 kPa IEC TR 60271 3 1 1K4 IEC TR 60271 3 1 1K4 Movement of surrounding air 1 0 m s IEC TR 60271 3 1 1K4 Water rain dripping icing and frosting Not allowed Radiation Solar Heat 1120 600 W m2 ETS 300 019 2 1 T1 2 IEC 68 2 2 Bb ETS 300 019 2 1 T1 2 IEC 68 2 2 B...

Page 85: ...C 68 2 6 Shock half sinus Acceleration 500g Shock duration 1msec 1 shock per axis 6 positions x y and z DIN IEC 68 2 27 Dry heat Temperature 70 2 C Test duration 16h Humidity in the test chamber 50 EN 60068 2 2 Bb ETS 300 019 2 7 Temperature change shock Low temperature 40 C 2 C High temperature 85 C 2 C Changeover time 30s dual chamber system Test duration 1h Number of repetitions 100 DIN IEC 68 ...

Page 86: ...S 75 7 SPIDI GPIO4 74 8 GPIO7 GPIO3 73 9 GPIO6 GPIO2 72 10 GPIO5 GPIO1 71 11 I2CCLK_SPICLK I2CDAT_SPIDO 70 12 VUSB_IN USB_DP 69 13 DAI5 USB_DN 68 14 ISENSE VSENSE 67 15 DAI6 VMIC 66 16 CCCLK EPN2 65 17 CCVCC EPP2 64 18 CCIO EPP1 63 19 CCRST EPN1 62 20 CCIN MICN2 61 21 CCGND MICP2 60 22 DAI4 MICP1 59 23 DAI3 MICN1 58 24 DAI2 AGND 57 25 DAI1 IGT 56 26 DAI0 EMERG_RST 55 27 BATT_TEMP DCD0 54 28 SYNC C...

Page 87: ...ATT_TEMP I Connect NTC with RNTC 10kΩ 25 C to ground See Section 3 5 3 for B value of NTC Battery temperature measurement via NTC resistance NTC should be installed inside or near battery pack to enable proper charging and deliver temperature values If unused keep pin open ISENSE I VImax 4 65V ΔVImax to VBATT 0 3V at normal condition ISENSE is required for measuring the charge current For this pur...

Page 88: ...hes the mobile on This line must be driven low by an open drain or open collector driver Emergency reset I Internal pull up RI 5kΩ VILmax 0 2V at Imax 0 5mA VOHmin 1 75V VOHmax 3 05V Signal ______ Pull down 10ms Reset or turn off in case of emergency Pull down and release EMERG_RST Then activating IGT for 400ms will reset AC75 If IGT is not activated for 400ms AC75 switches off Data stored in the ...

Page 89: ...b use the AT SSYNC command If unused keep pin open RTC backup VDDLP I O RI 1kΩ VOmax 4 5V VBATT 4 3V VO 3 2V at IO 500µA VBATT 0V VI 2 7V 4 5V at Imax 15µA If unused keep pin open ASC0 Serial interface RXD0 TXD0 CTS0 RTS0 DTR0 DCD0 DSR0 RING0 O I O I I O O O VOLmax 0 2V at I 2mA VOHmin 2 55V at I 0 5mA VOHmax 3 05V VILmax 0 8V VIHmin 2 15V VIHmax VEXTmin 0 3V 3 05V Internal pull down at TXD0 RI 33...

Page 90: ...M interface are protected against ESD with a special diode array Usage of CCGND is mandatory CCIN I RI 100kΩ VILmax 0 6V at I 25µA VIHmin 2 1V at I 10µA VOmax 3 05V CCRST O RO 47Ω VOLmax 0 25V at I 1mA VOHmin 1 45V at I 0 5mA VOHmax 1 90V CCIO I O RI 4 7kΩ VILmax 0 45V VIHmin 1 35V VIHmax CCVCCmin 0 3V 2 00V RO 100Ω VOLmax 0 3V at I 1mA VOHmin 1 45V at I 0 5mA VOHmax 1 90V CCCLK O RO 100Ω VOLmax 0...

Page 91: ...C interface is not available If lines are unused keep pins open VUSB_IN I VINmin 4 0V VINmax 5 25V USB_DN I O USB USB_DP I O Differential Output Crossover voltage Range VCRSmin 1 5V VCRSmax 2 0V Line to GND VOHmax 3 6V VOHtyp 3 2V VOHmin 3 0V at I 0 5mA VOLmax 0 2V at I 2mA VIHmin 2 24V VILmax 0 96V Driver Output Resistance Ztyp 32Ohm Pullup at USB_DP Rtyp 1 5kOhm All electrical characteristics ac...

Page 92: ...step 3 No load Minimum differential resp single ended load 27Ohms The audio output can directly operate a 32 Ohm loudspeaker If unused keep pins open EPP1 O EPN1 O 4 2Vpp differential typical 0dBm0 6 0Vpp differential maximal 3 14dBm0 Measurement conditions Audio mode 5 Outstep 4 No load Minimum differential resp single ended load 7 5Ohms The audio output can directly operate an 8 Ohm loudspeaker ...

Page 93: ...Voltage ripple Normal condition power control level for Pout max f 200kHz f 200kHz 50 2 mV mV IVDDLP RTC Backup BATT 0V 25 µA OFF State supply current POWER DOWN mode7 50 100 µA SLEEP mode DRX 9 3 7 mA SLEEP mode DRX 5 4 6 mA SLEEP mode DRX 2 7 0 mA IBATT Average standby supply current 8 IDLE mode DRX 2 28 mA 7 Measured after module INIT switch ON the module and following switch OFF applied voltag...

Page 94: ...adio output power reduction with AT SCFG parameter ropr ropr 1 3 ropr 1 3 ropr 1 ropr 2 or 3 ropr 1 ropr 2 or 3 ropr 1 3 ropr 1 or 2 ropr 3 Current characteristics Burst current 50Ω antenna typ 1 75A 1 75A 1 75A 1 48A 1 26A 1 1A 1 4A peak 1 2A plateau 1 4A peak 1 2A plateau 1 1A peak 1 0A plateau Burst current total mismatch 3 2A 3 2A 3 2A 2 7A 2 3A 1 9A 1 8A peak 1 5A plateau 1 8A peak 1 5A plate...

Page 95: ...Bm Radio output power reduction with AT SCFG parameter ropr ropr 1 3 ropr 1 3 ropr 1 ropr 2 or 3 ropr 1 ropr 2 or 3 ropr 1 3 ropr 1 or 2 ropr 3 Current characteristics Burst current 50Ω antenna typ 1 3A 1 3A 1 3A 1 1A 0 95A 0 85A 1 0A peak 0 9A plateau 1 0A peak 0 9A plateau 0 9A peak 0 75A plateau Burst current total mismatch 2 2A 2 2A 2 2A 1 75A 1 5A 1 25A 1 3A peak 1 0A plateau 1 3A peak 1 0A p...

Page 96: ...ler before ADC 0 7 0 42dB 6dB steps inCalibrate Digital attenuation of input signal after ADC 0 32767 0dB 20 log inCalibrate 32768 outBbcGain EPP EPN analogue output gain of baseband controller after DAC 0 3 0 18dB 6dB steps outCalibrate n n 0 4 Digital attenuation of output signal after speech decoder before summation of sidetone and DAC Present for each volume step n 0 32767 6dB 20 log 2 outCali...

Page 97: ...ing the AT command parameters The parameters inBbcGain and inCalibrate can be set with AT SNFI All the other parameters are adjusted with AT SNFO Figure 41 Audio programming model mic Microphone feeding A D Speech coder sideTone MIC1 MIC2 A D Speech decoder TXDDAI RXDDAI 8Ohms EP1 EP2 32 Ohms GSM module ep VMIC io inBbcGain inCalibrate outCalibrate n outBbcGain AT parameters are given in brackets ...

Page 98: ...table Echo control Echo canceller ON ON ON ON OFF OFF Loss controller idle full attenuation 3dB 6dB 4dB 50dB 9dB 18dB 3dB 6dB OFF OFF Comfort noise generator ON ON ON ON OFF OFF Non linear processor ON ON ON ON OFF OFF MIC input signal for 0dBm0 10dBm0 f 1024 Hz 18mV 5 8mV 10 95mV 10 14mV 18mV 5 8mV 400mV 126mV 400mV 126mV EP output signal in mV rms 0dBm0 1024 Hz no load default gain 3 14 dBm0 475...

Page 99: ...inal differential output voltage peak to peak EPP1 to EPN1 2 8 2 9 V V 32 Ω no load Audio Mode 6 Volume 3 11 0 dBm0 Nominal level Output bias voltage Batt 2 V from EPP1 or EPN1 to AGND Output bias voltage 1 2 V from EPP2 or EPN2 to AGND Differential output gain settings gs at 6dB stages outBbcGain 18 0 dB Set with AT SNFO Fine scaling by DSP outCalibrate 0 dB Set with AT SNFO Differential output l...

Page 100: ...D MICP2 to MICN2 or AGND 1 6 V MICPx must be biased with 1 25V VMIC 2 Nominal input voltage peak to peak for 0dBm0 MICP1 to MICN1 or AGND MICP2 to MICN2 or AGND 1 1 V MICPx must be biased with 1 25V VMIC 2 Input amplifier gain in 6dB steps inBbcGain 0 42 dB Set with AT SNFI Fine scaling by DSP inCalibrate 0 dB Set with AT SNFI Microphone supply voltage VMIC 2 4 2 5 2 6 V VMIC current 2 mA Idle cha...

Page 101: ...5 960 MHz GSM 1800 1805 1880 MHz Frequency range Downlink BTS MS GSM 1900 1930 1990 MHz GSM 850 31 33 35 dBm E GSM 90015 31 33 35 dBm GSM 180016 28 30 32 dBm RF power ARP with 50Ω load GSM 1900 28 30 32 dBm GSM 850 124 E GSM 900 174 GSM 1800 374 Number of carriers GSM 1900 299 GSM 850 45 MHz E GSM 900 45 MHz GSM 1800 95 MHz Duplex spacing GSM 1900 80 MHz Carrier spacing 200 kHz Multiplex Duplex TD...

Page 102: ... remaining ports of AC75 are not accessible to the user of the final product since they are installed within the device and therefore are only protected according to the Human Body Model requirements AC75 has been tested according to the EN 61000 4 2 standard The measured values can be gathered from the following table Table 35 Measured electrostatic values Specification Requirements Contact disch...

Page 103: ...2 Page 103 of 120 27 04 2006 6 Mechanics 6 1 Mechanical Dimensions of AC75 Figure 42 shows the top view of AC75 and provides an overview of the board s mechanical dimensions For further details see Figure 43 Length 55 00mm Width 33 90mm Height 3 15mm Figure 42 AC75 top view Pin 80 Pin 1 ...

Page 104: ...AC75 Hardware Interface Description Strictly confidential Preliminary s AC75_HD_V00 202 Page 104 of 120 27 04 2006 All dimensions in mm Figure 43 Dimensions of AC75 ...

Page 105: ...lp you find appropriate spacers a list of selected screws and distance sleeves for 3mm stacking height can be found in Section 9 2 When using the two small holes take care that the screws are inserted with the screw head on the bottom of the AC75 PCB Screws for the large holes can be inserted from top or bottom For proper grounding it is strongly recommended to use large ground plane on the bottom...

Page 106: ... connector Parameter Specification 80 pin B2B connector Electrical Number of Contacts 80 Contact spacing 0 5mm 020 Voltage 50V Rated current 0 5A max per contact Contact resistance 50mΩ max per contact Insulation resistance 100MΩ Dielectric Withstanding Voltage 500V AC for 1 minute Physical Insulator material housing White glass filled LCP plastic flammability UL 94V 0 Contact material Plating Gol...

Page 107: ...AC75 Hardware Interface Description Strictly confidential Preliminary s AC75_HD_V00 202 Page 107 of 120 27 04 2006 Figure 44 Molex board to board connector 52991 0808 on AC75 ...

Page 108: ...AC75 Hardware Interface Description Strictly confidential Preliminary s AC75_HD_V00 202 Page 108 of 120 27 04 2006 Figure 45 Mating board to board connector 53748 0808 on application ...

Page 109: ...f the I2 C interface can be connected to an external power supply or to the VEXT line of AC75 The advantage of using VEXT is that when the module enters the Power down mode the I2 CI interface is shut down as well If you prefer to connect the resistors to an external power supply take care that the interface is shut down when the PWR_IND signal goes high in Power down mode The USB interface has di...

Page 110: ...AC75 Hardware Interface Description Strictly confidential Preliminary s AC75_HD_V00 202 Page 110 of 120 27 04 2006 Figure 46 AC75 sample application for Java ...

Page 111: ...75 consists of the following components Siemens AC75 cellular engine Development Support Box DSB75 SIM card reader integrated on DSB75 U FL R SMT antenna connector and U FL LP antenna cable Handset type Votronic HH SI 30 3 V1 1 0 Li Ion battery PC as MMI PC Power supply SIM RS 232 DSB75 Handset Li Ion battery GSM module Flex cable 100mm Antenna or 50 Ω cable to system simulator Antenna Figure 47 R...

Page 112: ...s for satisfying RF exposure com pliance Antennas used for this OEM module must not exceed 8 4dBi gain GSM 1900 and 2 9dBi GSM 850 for mobile and fixed operating configurations This device is approved as a module to be installed in other devices The FCC label of the module must be visible from the outside If not the host device is required to bear a second label stating Contains FCC ID QIPAC75 Man...

Page 113: ...umber L36880 N8811 A100 Votronic Handset VOTRONIC Votronic HH SI 30 3 V1 1 0 VOTRONIC Entwicklungs und Produktionsgesellschaft für elektronische Geräte mbH Saarbrücker Str 8 66386 St Ingbert Germany Phone 49 0 6 89 4 92 55 0 Fax 49 0 6 89 4 92 55 88 e mail contact votronic com SIM card holder incl push button ejector and slide in tray Molex Ordering numbers 91228 91236 Sales contacts are listed in...

Page 114: ...49 7066 9555 0 Fax 49 7066 9555 29 Email mxgermany molex com American Headquarters Lisle Illinois 60532 U S A Phone 1 800 78MOLEX Fax 1 630 969 1352 Molex China Distributors Beijing Room 1319 Tower B COFCO Plaza No 8 Jian Guo Men Nei Street 100005 Beijing P R China Phone 86 10 6526 9628 Phone 86 10 6526 9728 Phone 86 10 6526 9731 Fax 86 10 6526 9730 Molex Singapore Pte Ltd Jurong Singapore Phone 6...

Page 115: ...y although it is going to be updated in later versions of this document 9 2 1 Fasteners from German Supplier ETTINGER GmbH Sales contact ETTINGER GmbH http www ettinger de main cfm Phone 4981 04 66 23 0 Fax 4981 04 66 23 0 The following tables contain only article numbers and basic parameters of the listed components For further detail and ordering information please contact Ettinger GmbH Please n...

Page 116: ...erial Polyamide 6 6 Surface Black Internal diameter 2 2mm External diameter 4 0mm Flammability rating UL94 HB 2 spacers are delivered with DSB75 Support Board Article number 05 11 209 Threaded Stud M2 5 M2 Type E External thread at both ends Length 3 0mm Material Stainless steel X12CrMoS17 Thread 1 Length M2 5 6 0mm Thread 2 Length M2 8 0mm Width across flats 5 Recess yes Type External External ...

Page 117: ... Length 8 0mm Material Steel 4 8 Surface Zinced A2K Thread M2 Head diameter D 3 8mm Head height 1 30mm Type Slotted cheese head screw 2 screws are delivered with DSB75 Support Board Article number 01 14 141 Screw M2 DIN 84 ISO 1207 Length 10 0mm Material Steel 4 8 Surface Zinced A2K Thread M2 Head diameter D 3 8mm Head height 1 30mm Type Slotted cheese head screw ...

Page 118: ...SO 4032 Material Steel 4 8 Surface Zinced A2K Thread M2 Wrench size Ø 4 Thickness L 1 6mm Type Nut DIN UNC DIN934 2 nuts are delivered with DSB75 Support Board 9 3 Data Sheets of Recommended Batteries The following two data sheets have been provided by VARTA Microbattery GmbH Click here for sales contacts and further information http www varta microbattery com ...

Page 119: ...AC75 Hardware Interface Description Strictly confidential Preliminary s AC75_HD_V00 202 Page 119 of 120 27 04 2006 Figure 48 Lithium Ion battery from VARTA ...

Page 120: ...AC75 Hardware Interface Description Strictly confidential Preliminary s AC75_HD_V00 202 Page 120 of 120 27 04 2006 Figure 49 VARTA PoLiFlex Lithium Polymer battery ...

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