XT55/56 Siemens Cellular Engine Version: DocID: 02.96 XT55/56_hd_v02.96 XT55/56_hd_v02.96 Page 1 of 125 s Hardware Interface Description XT55/56 Hardware Interface Description Confidential / Preliminary 18.08.
XT55/56 Hardware Interface Description Confidential / Preliminary s Document Name: XT55/56 Hardware Interface Description Version: 02.96 Date: August 18, 2005 DocId: XT55/56_hd_v02.96 Status: Confidential / Preliminary General Notes Product is deemed accepted by recipient and is provided without interface to recipient’s products. The documentation and/or product are provided for testing, evaluation, integration and information purposes.
XT55/56 Hardware Interface Description Confidential / Preliminary s Contents 0 Document History .........................................................................................................8 1 Introduction .................................................................................................................11 1.1 Supported Software and Hardware Releases .....................................................11 1.2 Related Documents ..................................................
XT55/56 Hardware Interface Description Confidential / Preliminary s 3.8 3.9 RTC Backup for GSM Part of XT55/56 ................................................................56 Serial Interfaces of the XT55/56 GSM Part .........................................................57 3.9.1 Features Supported on the first Serial Interface of GSM Part (ASC0)...57 3.9.2 Features Supported on the second Serial Interface of GSM Part (ASC1) ...........................................................................
XT55/56 Hardware Interface Description Confidential / Preliminary 6.6 6.7 6.8 s 6.5.5 Voiceband Transmit Path.....................................................................107 Air Interface of the XT55/56 GSM Part ..............................................................108 Electrostatic Discharge ......................................................................................109 Reliability Characteristics..................................................................................
XT55/56 Hardware Interface Description Confidential / Preliminary s Figure 33: Never use antenna connector and antenna pad at the same time ....................... 82 Figure 34: Restricted area around antenna pad..................................................................... 82 Figure 35: GPS antenna connector (U.FL-R-SMT connector) ............................................... 83 Figure 36: Mechanical dimensions of U.FL-R-SMT connector...............................................
XT55/56 Hardware Interface Description Confidential / Preliminary s Table 26: Operating temperatures ......................................................................................... 88 Table 27: Electrical description of application interface ......................................................... 91 Table 28: Power supply ratings (GSM part) ........................................................................... 96 Table 29: Power supply ratings (GPS part)...................................
XT55/56 Hardware Interface Description Confidential / Preliminary 0 s Document History Preceding document: "XT55/56 Hardware Interface Description" Version 02.94 New document: "XT55/56 Hardware Interface Description" Version 02.96 Chapter What is new 1.4 Deleted section “Compliance with international rules and regulations”. 3.3.1.1 Added further details of timing after power-up. 3.6.2, 0, 3.6.5.1 More detailed description of RTS wake-up. 3.12.2.
XT55/56 Hardware Interface Description Confidential / Preliminary s Preceding document: "XT55 Hardware Interface Description" Version 02.06 New document: "XT55/56 Hardware Interface Description" Version 02.06a Chapter What is new Throughout document Added XT56. 4.4 Notes about power supply of RTC and SRAM of GPS part. 5.3 Table 23: Corrected Hirose part number U.FL-LP-068. 10 Added Siemens ordering number for module XT56. Preceding document: "XT55 Hardware Interface Description" Version 01.
XT55/56 Hardware Interface Description Confidential / Preliminary s Preceding document: "XT55 Hardware Interface Description" Version 01.00 New document: "XT55 Hardware Interface Description" Version 01.00a Chapter What is new General Notes Added trademark notice regarding SiRF Software 7.1 Figure 51: Mechanical dimensions of XT55/56 – added new drawing Preceding document: "XT55/56 Hardware Interface Description" Version 00.02 New document: "XT55/56 Hardware Interface Description" Version 01.
s XT55/56 Hardware Interface Description Confidential / Preliminary 1 Introduction This document describes the hardware interface of the Siemens XT55/56 module that connects to the cellular device application and the air interface. As XT55/56 is intended to integrate with a wide range of application platforms, all functional components are described in great detail. This guide therefore covers all information needed to design and set up cellular applications incorporating the XT55/56 module.
XT55/56 Hardware Interface Description Confidential / Preliminary 1.
XT55/56 Hardware Interface Description Confidential / Preliminary 1.3 s Terms and Abbreviations Abbreviation Description AD Analog / Digital ADC Analog-to-Digital Converter AFC Automatic Frequency Control AGC Automatic Gain Control ANSI American National Standards Institute ARFCN Absolute Radio Frequency Channel Number ARP Antenna Reference Point ASC0 / ASC1 Asynchronous Controller.
XT55/56 Hardware Interface Description Confidential / Preliminary Abbreviation Description DTR Data Terminal Ready DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic Compatibility ESD Electrostatic Discharge ETS European Telecommunication Standard FCC Federal Communications Commission (U.S.
XT55/56 Hardware Interface Description Confidential / Preliminary s Abbreviation Description PA Power Amplifier PAP Password Authentication Protocol PBCCH Packet Switched Broadcast Control Channel PCB Printed Circuit Board PCL Power Control Level PCM Pulse Code Modulation PCN Personal Communications Network, also referred to as DCS 1800 PCS Personal Communication System, also referred to as GSM 1900 PDU Protocol Data Unit PLL Phase Locked Loop PPP Point-to-point protocol PRN Pseud
XT55/56 Hardware Interface Description Confidential / Preliminary Abbreviation Description WAAS Wide Area Augmentation System s Phonebook abbreviations FD SIM fixdialing 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 ON Own numbers (MSISDNs) stored on SIM or ME RC Mobile Equipment list of received calls SM SIM phonebook XT55/56_hd_v02.96 Page 16 of 125 18.08.
XT55/56 Hardware Interface Description Confidential / Preliminary 1.4 s Type Approval XT55/56 has been approved to comply with the directives and standards listed below and is labeled with the CE conformity mark.
XT55/56 Hardware Interface Description Confidential / Preliminary s ETSI EN 301 489-07 “V1.2.
XT55/56 Hardware Interface Description Confidential / Preliminary 1.5 s Safety Precautions The following safety precautions must be observed during all phases of the operation, usage, service or repair of any cellular terminal or mobile incorporating XT55/56. 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.
XT55/56 Hardware Interface Description Confidential / Preliminary s Road safety comes first! Do not use a hand-held cellular terminal or mobile when driving a vehicle, unless it is securely mounted in a holder for handsfree operation. Before making a call with a hand-held terminal or mobile, park the vehicle. Handsfree devices must be installed by qualified personnel. Faulty installation or operation can constitute a safety hazard.
XT55/56 Hardware Interface Description Confidential / Preliminary 2 s Product Concept Designed for use on any GSM network in the world, Siemens XT55 is a tri-band GSM/GPRS engine that works on the three frequencies GSM 900 MHz, GSM 1800 MHz and GSM 1900 MHz and supports also GPS technology for satellite navigation. XT56 is a tri-band GSM/GPRS engine that works on the three frequencies GSM 850MHz, GSM 1800 MHz and GSM 1900 MHz and supports also GPS technology for satellite navigation.
s XT55/56 Hardware Interface Description Confidential / Preliminary 2.1 XT55/56 Key Features at a Glance Table 1: XT55/56 key features Feature Implementation Power supply Supply voltage 3.3V – 4.8V for the GSM / GPRS module Separate power supply source: 3.
XT55/56 Hardware Interface Description Confidential / Preliminary s Feature Implementation FAX Group 3: Class 1, Class 2 SIM interface Supported SIM card: 3V External SIM card reader has to be connected via interface connector (note that card reader is not part of XT55/56) External antenna GSM / GPRS: GPS: Connected via 50 Ohm antenna connector or antenna pad. Separate GPS antenna connector. See Figure 49 for details.
s XT55/56 Hardware Interface Description Confidential / Preliminary Table 2: GSM coding schemes and maximum net data rates over air interface Coding scheme 1 Timeslot 2 Timeslots 4 Timeslots CS-1: 9.05 kbps 18.1 kbps 36.2 kbps CS-2: 13.4 kbps 26.8 kbps 53.6 kbps CS-3: 15.6 kbps 31.2 kbps 62.4 kbps CS-4: 21.4 kbps 42.8 kbps 85.
XT55/56 Hardware Interface Description Confidential / Preliminary 2.2 s Circuit Concept The XT55/56 module comprises the following major functional components: GSM / GPRS baseband block: • Baseband controller operating at 26MHz • Power supply ASIC • Stacked Flash / SRAM • Application interface (board-to-board connector) GSM RF block: • RF transceiver • RF power amplifier / FEM • Antenna connector GPS block: • Processor type: ARM7/TDMI • Processor speed: depending on GPS software, e.g. 12.
s XT55/56 Hardware Interface Description Confidential / Preliminary Active GPS antenna GSM antenna GSM – GSM module XT55 XT56 GPS – Modul GPS module Modul GSM_RXD0 ASC0 GSM_TXD0 6 Modem Status lines ASC1 Serial data 2 Serial data 1 GSM_RXD1 GSM_TXD1 GSM_RTS1 GSM_CTS1 SDO2 SDI2 SDI1 SDO1 80 pin B2B 80 pin B2B Customer application Serial 1 GSM Serial 0 GSM Serial 2 Serial 1 GPS GPS Figure 2: Block diagram of serial interface concept XT55/56_hd_v02.96 Page 26 of 125 18.08.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3 GSM Application Interface The GSM part of the XT55/56 module incorporates several sub-interfaces described in the following chapters: • Power supply and charging control (see Chapters 3.2 and 3.3) • Dual serial GSM interface (see Chapter 3.9) • Two analog audio interfaces and a digital audio interface (see Chapter 3.10) • SIM interface (see Chapter 3.
XT55/56 Hardware Interface Description Confidential / Preliminary Mode Function POWER DOWN Normal shutdown after sending the AT^SMSO command. s The Power Supply ASIC (PSU-ASIC) disconnects the supply voltage from the baseband part of the circuit. Only a voltage regulator in the PSU-ASIC is active for powering the RTC. Software is not active. The serial interfaces are not accessible. Operating voltage (connected to GSM_BATT+) remains applied.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.2 Power Supply The power supply for the GSM part of the XT55/56 module has to be a single voltage source of VGSM_BATT+= 3.3V...4.8V. It must be able to provide sufficient current in a transmit burst which typically rises to 1.6A. All the key functions for supplying power to the device are handled by an ASIC power supply.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.2.2 Minimizing Power Losses When designing the power supply for your application please pay specific attention to power losses. Ensure that the input voltage VGSM_BATT+ never drops below 3.3V on the GSM part of the XT55/56 board, not even in a transmit burst where current consumption can rise to typical peaks of 1.6A. It should be noted that the GSM part of the XT55/56 module switches off when exceeding these limits.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.3 s Power Up / Down Scenarios In general, be sure not to turn on GSM part of the XT55/56 module while it is out of the operating range of voltage and temperature stated in Chapters 6.2 and 6.3. The GSM part of the XT55/56 would immediately switch off after having started and detected these inappropriate conditions. 3.3.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.3.1.1 Turn on the GSM Part of XT55/56 Using the Ignition Line GSM_IGT (Power on) To switch on the XT55/56 GSM part the GSM_IGT (Ignition) signal needs to be driven to ground level for at least 100ms and not earlier than 10ms after the last falling edge of GSM_VDD. This can be accomplished using an open drain/collector driver in order to avoid current flowing into this pin. GSM_BATT+ min. 10ms HiZ min. 100ms HiZ GSM_IGT ca.
s XT55/56 Hardware Interface Description Confidential / Preliminary Assertion of GSM_CTS indicates that the module is ready to receive data from the host application. In addition, if configured to a fixed bit rate (AT+IPR≠0), the module will send the URC “^SYSSTART” which notifies the host application that the first AT command can be sent to the module.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.0V GSM_BATT+ 0V GSM_IGT HiZ HiZ 10ms min. 100ms max. 1ms Figure 6: Timing of power-on process if GSM_VDDLP is fed from external source 3.3.1.3 Turn on the GSM Part of XT55/56 Using the GSM_POWER Signal As detailed in Chapter 3.5.4, the charging adapter can be connected regardless of the module’s operating mode (except for Alarm mode).
XT55/56 Hardware Interface Description Confidential / Preliminary s Table 5: AT commands available in Alarm mode AT command Function AT+CALA Set alarm time AT+CCLK Set date and time of RTC AT^SBC In Alarm mode, you can only query the present current consumption and check whether or not a charger is connected. The battery capacity is returned as 0, regardless of the actual voltage (since the values measured directly on the cell are not delivered to the module).
XT55/56 Hardware Interface Description Confidential / Preliminary 3.3.2.1 s Turn off GSM Part of the XT55/56 Module Using AT^SMSO The best and safest approach to powering down the XT55/56 GSM part is to issue the AT^SMSO command. This procedure lets the GSM engine log off from the network and allows the software to enter into a secure state and safe data before disconnecting the power supply. The mode is referred to as POWER DOWN mode. In this mode, only the RTC stays active.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.3.2.2 Caution: s Emergency Shutdown Using GSM_EMERGOFF Pin Use the GSM_EMERGOFF pin only when, due to serious problems, the software is not responding for more than 5 seconds. Pulling the GSM_EMERGOFF pin causes the loss of all information stored in the volatile memory since power is cut off immediately. Therefore, this procedure is intended only for use in case of emergency, e.g. if XT55/56 fails to shut down properly.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.3.3 s Automatic Shutdown Automatic shutdown takes effect if • the XT55/56 board is exceeding the critical limits of overtemperature or undertemperature • the battery is exceeding the critical limits of overtemperature or undertemperature • undervoltage is detected The automatic shutdown procedure is equivalent to the power-down initiated with the AT^SMSO command, i.e.
XT55/56 Hardware Interface Description Confidential / Preliminary s Table 6: Temperature dependent behavior Sending temperature alert (15 s after start-up, otherwise only if URC presentation enabled) ^SCTM_A: 1 Caution: Tamb of battery close to over temperature limit. ^SCTM_B: 1 Caution: Tamb of board close to over temperature limit. ^SCTM_A: -1 Caution: Tamb of battery close to under temperature limit. ^SCTM_B: -1 Caution: Tamb of board close to under temperature limit.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.3.3.4 s Undervoltage Shutdown if no Battery NTC is Present The undervoltage protection is also effective in applications, where no NTC connects to the GSM_BATT_TEMP terminal. Thus, you can take advantage of this feature even though the application handles the charging process or XT55/56 is fed by a fixed supply voltage.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.4 s Automatic GPRS Multislot Class Change Temperature control is also effective for operation in GPRS Multislot Class 10. If the board temperature increases to the limit specified for restricted operation1) while data are transmitted over GPRS, the module automatically reverts from GPRS Multislot Class 10 (2 Tx) to Class 8 (1Tx). This reduces the power consumption and, consequently, causes the board’s temperature to decrease.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.5 Charging Control of the GSM Part The GSM part of the XT55/56 module integrates a charging management for Li-Ion batteries. You can skip this chapter if charging is not your concern, or if you are not using the implemented charging algorithm. XT55/56 has no on-board charging circuit. To benefit from the implemented charging management you are required to install a charging circuit within your application.
s XT55/56 Hardware Interface Description Confidential / Preliminary Table 7: Bill of material for external charging circuit Part Description SI3441DV p-chan 2.5V (G-S) MOSFET VISHAY: SI3441DV-T1 (TSOP-6) NEC: 1SS355 100mA Si-diode (UMD2) ROHM: Toshiba: 1SS352TPH3 CRS04 1A Schottky diode Toshiba: CRS04 4V3 250mW; 200mA; 4.3V Z-Diode (SOD323) Philips: ESDA6V1-5W6 ESD protection TRANSIL™ STM: array 470R, 3k3, 10k Resistor, e.g.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.5.1 Battery Pack Characteristics The charging algorithm has been optimized for a Li-Ion battery pack that meets the characteristics listed below. It is recommended that the battery pack you want to integrate into your XT55/56 application is compliant with these specifications. This ensures reliable operation, proper charging and, particularly, allows you to monitor the battery capacity using the AT^SBC command (see [1] for details).
XT55/56 Hardware Interface Description Confidential / Preliminary 3.5.2 s Recommended Battery Pack Specification Table 8: Specifications of recommended battery pack Battery type Li-Ion Nominal voltage 3.6V Capacity 800mAh NTC 10kΩ ± 5% @ 25°C, B (25/85)=3435K ± 3% Overcharge detection voltage 4.325 ± 0.025V Overcharge release voltage 4.075 ± 0.025V Overdischarge detection voltage 2.5 ± 0.05V Overdischarge release voltage 2.9 ± 0.5V Overcurrent detection 3 ± 0.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.5.3 s Implemented Charging Technique If the external charging circuit follows the recommendation of Figure 8, the charging process consists of trickle charging and processor controlled fast charging. For this solution, the fast charging current provided by the charger or any other external source must be limited to 500mA.
XT55/56 Hardware Interface Description Confidential / Preliminary s Voltage 4.3 4.2 End of charging 3.8 3.4 100ms 2 ... 0.1s 100ms 0.1 ... 2s 3.0 Constant current tOFF = 100 ms tON = 100 ms Time Figure 10: Charging process Note: Do not connect the charger to the GSM_BATT+ lines.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.5.4 Operating Modes during Charging Of course, the battery can be charged regardless of the engine's operating mode. When the GSM engine is in Normal mode (SLEEP, IDLE, TALK, GPRS IDLE or GPRS DATA mode), it remains operational while charging is in progress (provided that sufficient voltage is applied). The charging process during the Normal mode is referred to as Charge mode.
XT55/56 Hardware Interface Description Confidential / Preliminary s Features of Charge-only mode Once the GSM engine enters the Charge-only mode, the AT command interface presents an Unsolicited Result Code (URC) which reads: ^SYSSTART CHARGE-ONLY MODE Note that this URC will not appear when autobauding was activated (due to the missing synchronization between DTE and DCE upon start-up). Therefore, it is recommended to select a fixed baudrate before using the Charge-only mode.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.6 s Power Saving SLEEP mode reduces the functionality of the GSM part of the XT55/56 module to a minimum and, thus, minimizes the current consumption to the lowest level. Settings can be made using the AT+CFUN command. For details see below and [1]. SLEEP mode falls into two categories: • NON-CYCLIC SLEEP mode AT+CFUN=0 • CYCLIC SLEEP modes, selectable with AT+CFUN=5, 6, 7, 8 or 9.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.6.3 s CYCLIC SLEEP Mode (AT+CFUN=5, 6, 7, 8) The major benefit over the NON-CYCLIC SLEEP mode is that the serial interface is not permanently blocked and that packet switched calls may go on without terminating the selected CYCLIC SLEEP mode. This allows the GSM part of the XT55/56 to become active, for example to perform a GPRS data transfer, and to resume power saving after the GPRS data transfer is completed.
s XT55/56 Hardware Interface Description Confidential / Preliminary activity. If the start bit of a received character is detected within these 9.2 ms, GSM_CTS will be activated and the proper reception of the character will be guaranteed. GSM_CTS will also be activated if any character is to be sent.
s XT55/56 Hardware Interface Description Confidential / Preliminary Wake up XT55/56 from SLEEP Mode A wake-up event is any event that causes the module to draw current. Depending on the selected mode the wake-up event either switches SLEEP mode off and takes XT55/56 back to AT+CFUN=1, or activates XT55/56 temporarily without leaving the current SLEEP mode. Definitions of the state transitions described in Table 11: Quit = XT55/56 exits SLEEP mode and returns to AT+CFUN=1.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.6.5.1 s Wake-up via /RTS0 and RTS1 (if AT+CFUN=0 or AT+CFUN=9) During the CYCLIC SLEEP modes 5, 6, 7, and 8, GSM_RTS0 and GSM_RTS1 are conventionally used for flow control: The assertion of GSM_RTS0 or GSM_RTS1 indicates that the application is ready to receive data - without waking up the module.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.7 Summary of State Transitions (Except SLEEP Mode) Table 12: State transitions of XT55/56 (except SLEEP mode) The table shows how to proceed from one GSM mode to another (grey column = present mode, white columns = intended modes) POWER DOWN Normal mode**) Charge-only mode*) Charging in normal mode*)**) Alarm mode POWER DOWN mode without charger --- GSM_IGT >100 ms at low level Connect charger to input of ext.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.8 RTC Backup for GSM Part of XT55/56 The internal Real Time Clock of the XT55/56 GSM part is supplied from a separate voltage regulator in the power supply ASIC which is also active when the GSM part of the XT55/56 is in POWER DOWN status. An alarm function is provided that allows to wake up XT55/56 without logging on to the GSM network.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.9 s Serial Interfaces of the XT55/56 GSM Part The GSM part of the XT55/56 module offers two unbalanced, asynchronous serial interfaces conforming to ITU-T V.24 protocol DCE signaling. The electrical characteristics do not comply with ITU-T V.28. The significant levels are 0V (for low data bit or ON condition) and 2.65V (for high data bit or OFF condition). For electrical characteristics please refer to Table 38.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.9.2 • • • 4-wire serial interface Includes only the data lines GSM_TXD1 and GSM_RXD1 plus GSM_RTS1 and GSM_CTS1 for hardware handshake. This interface is intended for voice calls, GPRS services and for controlling the GSM engine with AT commands. It is not suited for CSD calls, fax calls and Multiplex mode. On ASC1 no GSM_RING line is available.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.10 Audio Interfaces XT55/56 comprises three audio interfaces available on the board-to-board connector: • Two analog audio interfaces, each with a balanced analog microphone input and a balanced analog earpiece output. The second analog interface provides a supply circuit to feed an active microphone. • Serial digital audio interface (DAI) using PCM (Pulse Code Modulation) to encode analog voice signals into digital bit streams.
s XT55/56 Hardware Interface Description Confidential / Preliminary When shipped from factory, all audio parameters of XT55/56 are set to interface 1 and audio mode 1. This is the default configuration optimized for the Votronic HH-SI-30.3/V1.1/0 handset and used for type approving the Siemens reference configuration. Audio mode 1 has fix parameters which cannot be modified. To adjust the settings of the Votronic handset simply change to another audio mode.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.10.2 s Speech Processing The speech samples from the ADC or DAI are handled by the DSP of the baseband controller to calculate e.g. amplifications, sidetone, echo cancellation or noise suppression depending on the configuration of the active audio mode. These processed samples are passed to the speech encoder.
s XT55/56 Hardware Interface Description Confidential / Preliminary Note: Before starting the data transfer the clock GSM_SCLK should be available for at least three cycles. After the transfer of the LSB0 the clock GSM_SCLK should be still available for at least three cycles.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.11 s SIM Interface The baseband processor has an integrated SIM interface compatible with the ISO 7816 IC Card standard. This is wired to the host interface (board-to-board connector) in order to be connected to an external SIM card holder. Six pins on the board-to-board connector are reserved for the SIM interface. The GSM_CCIN pin serves to detect whether a tray (with SIM card) is present in the card holder.
XT55/56 Hardware Interface Description Confidential / Preliminary 3.11.1 s Requirements for Using the GSM_CCIN Pin According to ISO/IEC 7816-3 the SIM interface must be immediately shut down once the SIM card is removed during operation. Therefore, the signal at the GSM_CCIN pin must go low before the SIM card contacts are mechanically detached from the SIM interface contacts. This shut-down procedure is particularly required to protect the SIM card as well as the SIM interface of XT55/56 from damage.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.11.2 Design Considerations for SIM Card Holder The schematic below is a sample configuration that illustrates the Molex SIM card holder located on the DSB45 Support Box (evaluation kit used for type approval of the Siemens XT55/56 reference setup, see [9]). X503 is the designation used for the SIM card holder in [9].
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.12 Control Signals 3.12.1 Inputs Table 17: Input control signals of the GSM part of the XT55/56 module Signal Pin Pin status Function Ignition GSM_IGT Falling edge Power up XT55/56 Active low ≥ 100ms (Open drain/collector driver to GND No operation required in cellular device application).
XT55/56 Hardware Interface Description Confidential / Preliminary 3.12.2 Outputs 3.12.2.1 Synchronization Signal s The synchronization signal serves to indicate growing power consumption during the transmit burst. The signal is generated by the GSM_SYNC pin. Please note that this pin can adopt two different operating modes which you can select by using the AT^SSYNC command (mode 0 and 1). For details refer to the following chapter and to [1].
XT55/56 Hardware Interface Description Confidential / Preliminary 3.12.2.2 s Using the GSM_SYNC Pin to Control a Status LED As an alternative to generating the synchronization signal, the SYNC pin can be used to control a status LED on your application platform. 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.
XT55/56 Hardware Interface Description Confidential / Preliminary s To operate the LED a buffer, e.g. a transistor or gate, must be included in your application. A sample configuration can be gathered from Figure 23. Power consumption in the LED mode is the same as for the synchronization signal mode. For details see Table 27, GSM_SYNC pin. Figure 23: LED Circuit (Example) XT55/56_hd_v02.96 Page 69 of 125 18.08.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3.12.3 Behavior of the GSM_RING0 Line (ASC0 Interface only) The GSM_RING0 line is available on the first serial interface (ASC0). The signal serves to indicate incoming calls and other types of URCs (Unsolicited Result Code). Although not mandatory for use in a host application, it is strongly suggested that you connect the GSM_RING0 line to an interrupt line of your application.
XT55/56 Hardware Interface Description Confidential / Preliminary 4 s GPS Application Interface The XT55/56 module integrates a GPS receiver which offers the full performance of GPS technology. The GPS receiver continuously tracks all satellites in view, thus providing accurate satellite position data. The GPS block can be used even if the XT55/56 module is deregistered from the GSM network. 4.
XT55/56 Hardware Interface Description Confidential / Preliminary 4.2 s Technical Data Industry leading GPS performance • • • • 12 channel GPS receiver Signal acquisition using 1920 time / frequency search channels Multipath-mitigation hardware Cold start < 45 sec Low power • • • • Typ.
XT55/56 Hardware Interface Description Confidential / Preliminary 4.3 s GPS Operating Modes Mode Function Normal operation The receiver is continuously running in Normal mode, as long as the operating voltage Vcc is supplied. Position fixes are generated at the maximum update rate. This enables the receiver a warm- and hotstart. However, the cold- and warmstart times of the receiver do not differ significantly under good visibility conditions.
XT55/56 Hardware Interface Description Confidential / Preliminary 4.3.1 s Trickle Power Mode The default mode of XT55/56 GPS part is continuous mode, but the user can set the XT55/56 GPS part into the Trickle Power mode using the input command message. The XT55/56 GPS part enters the Trickle Power mode corresponding to Figure 27 (800ms OFF time and 200ms ON time) as soon as valid GPS data are available. As a result the average power consumption is reduced by approximately 80 % (approximately 150mW).
XT55/56 Hardware Interface Description Confidential / Preliminary 4.3.2 s Comparison of Trickle Power and Push-to-Fix Mode A comparison of the Trickle Power mode and Push-to-Fix mode is shown in Figure 28. This diagram shows that for position update intervals less than approximately 600 seconds (i.e. rates faster than one fix per 10 minutes), the Trickle Power mode at an update interval of 10 seconds offers a lower power solution.
XT55/56 Hardware Interface Description Confidential / Preliminary 4.4 s Power Supply of the XT55/56 GPS Part The power supply for the GPS part of the XT55/56 module has to be a single voltage source of VCC=3.3V ± 5%. It must be able to provide sufficient current of >100mA. GPS_VCC: Two GPS_VCC pins of the board-to-board connector are dedicated to connect the power supply voltage, five GND pins shared with the GSM part of the XT55/56 module are recommended for grounding; see Figure 40 for details.
XT55/56 Hardware Interface Description Confidential / Preliminary 4.6 s Serial Interfaces of the XT55/56 GPS Part The GPS part of the XT55/56 module offers two serial interfaces: SD1 • 2-wire serial interface • Includes the SDI1 (receive) and SDO1 (transmit) lines • Supported baud rate: 9600…115200 bps. See also [1] for details on the used GPS protocol. SD2 • 2-wire serial interface • Includes the SDI2 (receive) and SDO2 (transmit) lines.
s XT55/56 Hardware Interface Description Confidential / Preliminary Vcc = 3.3 V DC 330 Ω GPS_RFPC0, GPS_RFPC1 BC817 47 k Ω GND Figure 29: Example of LED circuit 4.8 Receiver Architecture The XT55/56 GPS receiver is a product that features the SiRFstarII-Low Power chipset. It is a complete 12 channel, WAAS-enabled GPS receiver which provides a vastly superior position accuracy performance.
XT55/56 Hardware Interface Description Confidential / Preliminary s Figure 30 above shows the block diagram of the XT55/56 GPS receiver architecture. The GPS module can be separated into four major parts: RF frequency down-converter, digital baseband demodulation, embedded ARM microprocessor and internal GPS software stored on-board (1 MByte) Flash-Memory.
XT55/56 Hardware Interface Description Confidential / Preliminary 4.10 s Start-up Procedures The start-up strategy of the XT55/56 GPS part depends on the last position, current time and ephemeris data, that the receiver has stored the external SRAM memory. There are three different start-up procedures: 4.10.1 Coldstart The coldstart takes place when the receiver has no knowledge of its last position or time.
s XT55/56 Hardware Interface Description Confidential / Preliminary 5 GSM and GPS Antenna Interfaces 5.1 GSM Antenna Installation The RF interface has an impedance of 50Ω. XT55/56 is capable of sustaining a total mismatch at the antenna connector or pad 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 and harmonic suppression.
s XT55/56 Hardware Interface Description Confidential / Preliminary The U.FL-R-SMT connector has been chosen as antenna reference point (ARP) for the Siemens reference equipment submitted to type approve XT55/56. All RF data specified throughout this manual are related to the ARP. For compliance with the test results of the Siemens type approval you are advised to give priority to the connector, rather than using the antenna pad. IMPORTANT: Both solutions can only be applied alternatively.
XT55/56 Hardware Interface Description Confidential / Preliminary 5.1.2 s GSM Antenna Pad The antenna can be soldered to the pad, or attached via contact springs. To help you ground the antenna, XT55/56 comes with a grounding plane located close to the antenna pad. The positions of both pads can be seen from Figure 50. When you decide to use the antenna pad take into account that the pad has not been intended as antenna reference point (ARP) for the Siemens XT55/56 type approval.
s XT55/56 Hardware Interface Description Confidential / Preliminary 5.3 Hirose Antenna Connector XT55/56 uses two ultra-miniature SMT antenna connectors (GSM and GPS antenna) supplied from Hirose Ltd. The product name is U.FL-R-SMT. The positions of both antenna connectors on the XT55/56 board can be seen in Figure 49. Figure 36: Mechanical dimensions of U.FL-R-SMT connector Table 21: Product specifications of U.
s XT55/56 Hardware Interface Description Confidential / Preliminary Table 22: Material and finish of U.FL-R-SMT connector and recommended plugs Part Material Finish Shell Phosphor bronze Silver plating Male centre contact Brass Gold plating Female centre contact Phosphor bronze Gold plating Insulator Plug: Receptacle: PBT LCP Black Beige Mating plugs and cables can be chosen from the Hirose U.FL Series. Examples are shown below and listed in Table 23.
XT55/56 Hardware Interface Description Confidential / Preliminary s In addition to the connectors illustrated above, the U.FL-LP-(V)-040(01) version is offered as an extremely space saving solution. This plug is intended for use with extra fine cable (up to ∅ 0.81 mm) and minimizes the mating height to 2 mm. See Figure 39 which shows the Hirose datasheet. Figure 39: Specifications of U.FL-LP-(V)-040(01) plug XT55/56_hd_v02.96 Page 86 of 125 18.08.
s XT55/56 Hardware Interface Description Confidential / Preliminary Table 23: Ordering information for Hirose U.FL Series Item Part number HRS number Connector on XT55/56 U.FL-R-SMT CL331-0471-0-10 Right-angle plug shell for ∅ 0.81 mm cable U.FL-LP-040 CL331-0451-2 Right-angle plug for ∅ 0.81 mm cable U.FL-LP(V)-040 (01) CL331-053-8-01 Right-angle plug for ∅ 1.13 mm cable U.FL-LP-068 CL331-0452-5 Right-angle plug for ∅ 1.32 mm cable U.FL-LP-066 CL331-0452-5 Extraction jig E.
s XT55/56 Hardware Interface Description Confidential / Preliminary 6 Electrical, Reliability and Radio Characteristics 6.1 Absolute Maximum Ratings Absolute maximum ratings for supply voltage and voltages on digital and analog pins of XT55/56 are listed in Table 24. Exceeding these values will cause permanent damage to XT55/56. Table 24: Absolute maximum ratings (GSM part) Parameter Min Max Unit Voltage GSM_BATT+ -0.3 4.8 V Voltage at digital pins -0.3 3.3 V Voltage at analog pins -0.
XT55/56 Hardware Interface Description Confidential / Preliminary s supply voltage and operating temperature: To achieve Tamb max = 70°C and, for example, GSM 900 PCL 5 the supply voltage must not be higher than 4.2V. ***) To achive Tamb max = 70°C at permanent GPRS class 8 operation (1 TX, 4 RX GSM 900 at PCL 5 with a supply voltage 4.2V) it is recommended to integrate XT55/56 in such a way that a minor heat exchange with the environment can take place.
XT55/56 Hardware Interface Description Confidential / Preliminary 6.3 s Pin Description Please note that the reference voltages listed in Table 27 are the values measured directly on the XT55/56 module. They do not apply to the accessories connected. If an input pin is specified for VIHmax = 3.3V, be sure never to exceed the stated voltage. The value 3.3V is an absolute maximum rating. The Hirose DF12C board-to-board connector on XT55/56 is a 80-pin double-row receptacle.
XT55/56 Hardware Interface Description Confidential / Preliminary s Table 27: Electrical description of application interface Function Signal name IO Signal form and level Comments GSM power supply GSM_BATT+ I VI = 3.3V to 4.8V VInorm = 4.2V Inorm ≈ 1.6A (during Tx burst) Imax< 2A Power supply input. 5 GSM_BATT+ pins to be connected in parallel. 5 GND pins to be connected in parallel. The power supply must be able to meet the requirements of current consumption in a Tx burst (up to 3A).
s XT55/56 Hardware Interface Description Confidential / Preliminary Function Signal name IO Signal form and level Comments Ignition GSM_IGT I RI ≈ 100kΩ, CI ≈ 1nF VILmax = 0.5V at Imax = -20µA VOpenmax = 2.3V Input to switch the mobile ON. The line must be driven low by an Open Drain or Open Collector driver. ON Emergency shutdown (Watchdog) GSM_EMERGOFF I/O ~~~ |____|~~~ Active Low ≥ 100ms RI ≈22kΩ VILmax = 0.5V at Imax = -100µA VOpenmax = 2.73V Signal 3.
XT55/56 Hardware Interface Description Confidential / Preliminary Function Signal name s IO Signal form and level Comments I RI ≈ 100kΩ VILmax = 0.5V VIHmin = 2.15V at I = 20µA, VIHmax=3.3V at I = 30µA GSM_CCIN = high, SIM card holder closed (no card recognition) GSM_CCRST O RO ≈47Ω VOLmax = 0.25V at I = 1mA VOHmin = 2.3V at I = -1mA VOHmax = 2.73V GSM_CCIO IO RI ≈10kΩ VILmax = 0.5V VIHmin = 1.95V, VIHmax=3.3V Maximum cable length 200mm to SIM card holder.
XT55/56 Hardware Interface Description Confidential / Preliminary Signal name IO Signal form and level Comments O VOmax = 3.7Vpp See also Table 32. The audio output is balanced and can directly operate an earpiece. If unused keep pins open. VOmax = 3.7Vpp See also Table 32. Balanced audio output. Can be used to directly operate an earpiece. If unused keep pins open. RI ≈ 50kΩ differential VImax = 1.03Vpp See also Table 33. Balanced microphone input.
s XT55/56 Hardware Interface Description Confidential / Preliminary Function IO Signal form and level Comments Digital Input / GPS_GPIO14 Output Signal name I/O CMOS 3.3V DC level See Chapter 4.5 Digital Input / GPS_GPIO15 Output I/O CMOS 3.3V DC level See Chapter 4.5 GPS Reset GPS_M-RST I CMOS 3.3V DC level Active low reset input Serial1 Rx GPS_SDI1 I CMOS 3.3V DC level See Chapter 4.6 Serial1 Tx GPS_SDO1 O CMOS 3.3V DC level See Chapter 4.
s XT55/56 Hardware Interface Description Confidential / Preliminary 6.4 Power Supply Ratings Table 28: Power supply ratings (GSM part) Parameter Description Conditions Min GSM_BATT+ Supply voltage Reference points on XT55/56: TP GSM_BATT+ and TP GND (see Figure 50). 3.3 Typ Max 4.2 Unit 4.8 V 400 mV Voltage must stay within the min/max values, including voltage drop, ripple, spikes.
s XT55/56 Hardware Interface Description Confidential / Preliminary Table 29: Power supply ratings (GPS part) Parameter Description Conditions GPS_VCC Supply voltage IGPS_VCC Average supply current Min 3.14 Continuous mode (without antenna feeding on GPS_VCC_RF) Typ Max Unit 3.3 3.46 V 80 100 mA Please note that the stated current values are depending on the used mode of the module XT55/56_hd_v02.96 Page 97 of 125 18.08.
s XT55/56 Hardware Interface Description Confidential / Preliminary 6.4.1 Current Consumption during GSM Transmit Burst The diagrams provided in Figure 46 and Figure 47 illustrate the typical current consumption of the application caused during a transmit burst. The typical peak current is shown vs. the power control level for 900 MHz, 1800 MHz and 1900 MHz and vs. the return loss of the antenna. Test conditions: All measurements have been performed at Tamb= 25°C, VGSM_BATT+ nom = 4.1V.
s XT55/56 Hardware Interface Description Confidential / Preliminary Average Current DCS1800 (VBATT+=4.1V) 0.3 0.25 0.26 1 TX - Average Current 2 TX - Average Current Current (Amps) 0.2 0.19 0.15 0.18 0.16 0.14 0.13 0.13 0.1 0.12 0.10 0.10 0.05 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Power Control Level Figure 42: Typical current consumption vs. return loss in GSM 1800 network Average Current PCS1900 (VBATT+=4.1V) 0.3 0.29 0.
s XT55/56 Hardware Interface Description Confidential / Preliminary Burst Current GSM900 (VBATT+=4.1V) 1.8 1.6 1.6 1.4 1 TX - Peak current 1.2 Current (Amps) 1.24 1 0.8 0.6 0.68 0.4 0.4 0.3 0.2 0.28 0 5 7 9 11 13 15 17 19 Power Control Level Figure 44: Peak current consumption during transmit burst in EGSM 900 network Burst Current DCS1800 (VBATT+=4.1V) 1 0.9 0.8 1 TX - Peak current 0.84 Current (Amps) 0.7 0.6 0.5 0.52 0.4 0.38 0.3 0.27 0.2 0.24 0.
s XT55/56 Hardware Interface Description Confidential / Preliminary Burst Current PCS1900 (VBATT+=4.1V) 1 0.92 0.9 0.8 1 TX - Peak current Current (Amps) 0.7 0.6 0.6 0.5 0.4 0.42 0.3 0.3 0.24 0.2 0.1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Power Control Level Test conditions: Tamb= 25°C, VGSM_BATT+ nom = 4.1V Figure 46: Peak current consumption during transmit burst in GSM 1900 network XT55/56_hd_v02.96 Page 101 of 125 18.08.
s XT55/56 Hardware Interface Description Confidential / Preliminary 1600 Service mode GSM900 ch.124 Variations in current with 0.4dB return loss (all phases) 1400 1200 Current (mA) 1000 ch.124 PCL5 800 600 400 200 0 Burst (max) Burst (min) Average Current (Max) Average Current (Min) 1000 Service mode PCS1900 ch.661 Variations in current with 0.6dB return loss (all phases) 900 800 700 Current (mA) 600 ch.
s XT55/56 Hardware Interface Description Confidential / Preliminary 6.5 Electrical Characteristics of the Voiceband Part 6.5.1 Setting Audio Parameters by AT Commands The audio modes 2 to 6 can be adjusted according to the parameters listed below. Each audio mode is assigned a separate set of parameters. Table 30: Audio parameters adjustable by AT command Parameter Influence to Range Gain range Calculation inBbcGain MICP/MICN analog amplifier gain of baseband controller before ADC 0...7 0...
s XT55/56 Hardware Interface Description Confidential / Preliminary 6.5.2 Audio Programming Model The audio programming model shows how the signal path can be influenced by varying the AT command parameters. The model is the same for all three interfaces, except for the parameters and which cannot be modified if the digital audio interface is being used, since in this case the DAC is switched off. The parameters inBbcGain and inCalibrate can be set with AT^SNFI.
s XT55/56 Hardware Interface Description Confidential / Preliminary 6.5.3 Characteristics of Audio Modes The electrical characteristics of the voiceband part depend on the current audio mode set with the AT^SNFS command. Table 31: Voiceband characteristics (typical) Audio mode no.
s XT55/56 Hardware Interface Description Confidential / Preliminary 3) Audio mode 5 and 6 are identical. With AT^SAIC, you can easily switch mode 5 to the second interface. Therefore, audio mode 6 is only kept for compatibility to earlier Siemens GSM products. Note: With regard to acoustic shock, the cellular application must be designed to avoid sending false AT commands that might increase amplification, e.g. for a high sensitive earpiece.
s XT55/56 Hardware Interface Description Confidential / Preliminary 6.5.5 Voiceband Transmit Path Test conditions: • The values specified below were tested to 1kHz and 0dB gain stage, unless otherwise stated. • Parameter setup: Audio mode = 5 for GSM_MICP1 to GSM_MICN1 and 6 for GSM_MICP2 to GSM_MICN2, inBbcGain= 0, inCalibrate = 32767, outBbcGain = 0, OutCalibrate = 16384, sideTone = 0 Table 33: Voiceband transmit path Parameter Min Typ Input voltage (peak to peak) Max Unit 1.
s XT55/56 Hardware Interface Description Confidential / Preliminary 6.6 Air Interface of the XT55/56 GSM Part Test conditions: All measurements have been performed at Tamb= 25°C, VGSM_BATT+ nom = 4.1V. The reference points used on XT55/56 are the GSM_BATT+ and GND contacts (test points are shown in Figure 50).
s XT55/56 Hardware Interface Description Confidential / Preliminary 6.7 Electrostatic Discharge The GSM engine is not protected against Electrostatic Discharge (ESD) in general. Consequently, it is subject to ESD handling precautions that typically apply to ESD sensitive components. Proper ESD handling and packaging procedures must be applied throughout the processing, handling and operation of any application that incorporates a XT55/56 module.
XT55/56 Hardware Interface Description Confidential / Preliminary 6.8 s Reliability Characteristics The test conditions stated below are an extract of the complete test specifications. Table 36: Summary of reliability test conditions Type of test Conditions Standard Vibration Frequency range: 10-20 Hz; acceleration: 3.
XT55/56 Hardware Interface Description Confidential / Preliminary 7 s Mechanics The following chapters describe the mechanical dimensions of XT55/56 and give recommendations for integrating XT55/56 into the host application. 7.1 Mechanical Dimensions of XT55/56 Figure 49 shows the top view of XT55/56. For further details see Figure 51. Size: Weight: 35.0 ± 0.15mm x 53.0 ± 0.15mm x 5.1 ± 0.
s XT55/56 Hardware Interface Description Confidential / Preliminary All dimensions in millimeters Figure 51: Mechanical dimensions of XT55/56 XT55/56_hd_v02.96 Page 112 of 125 18.08.
XT55/56 Hardware Interface Description Confidential / Preliminary 7.2 s Mounting XT55/56 onto the Application Platform There are many ways to properly install XT55/56 in the host device. To avoid harming the module while handling, an efficient approach is to mount the XT55/56 PCB to a frame, plate, rack or chassis.
XT55/56 Hardware Interface Description Confidential / Preliminary s All dimensions in millimeters Figure 53: Recommended dowel XT55/56_hd_v02.96 Page 114 of 125 18.08.
s XT55/56 Hardware Interface Description Confidential / Preliminary 7.3 Board-to-Board Connector This chapter provides specifications for the 80-pin board-to-board connector which serves as physical interface to the host application. The receptacle assembled on the XT55/56 PCB is type Hirose DF12C. Mating headers from Hirose are available in different stacking heights. Table 37: Ordering information DF12 series Item Part number Stacking height (mm) HRS number Receptacle on XT55/56 DF12C(3.
XT55/56 Hardware Interface Description Confidential / Preliminary s Figure 54: Mechanical dimensions of Hirose DF12 connector XT55/56_hd_v02.96 Page 116 of 125 18.08.
s XT55/56 Hardware Interface Description Confidential / Preliminary 8 Reference Approval 8.1 Reference Equipment for Type Approval The Siemens reference setup submitted to type approve XT55/56 consists of the following components: • Siemens XT55/56 cellular engine • Development Support Box (DSB45) • Flex cable (160 mm) from Hirose DF12C receptacle on XT55/56 to Hirose DF12 connector on DSB45. Please note that this cable is not included in the scope of delivery of DSB45.
XT55/56 Hardware Interface Description Confidential / Preliminary 8.2 s Compliance with FCC Rules and Regulations (XT55 only) The FCC Equipment Authorization Certification for the XT55 reference application described in Chapter 8.1 is listed under the FCC identifier QIPXT55 IC: 267W-XT55 granted to Siemens AG. The XT55 reference application registered under the above identifier is certified to be in accordance with the following Rules and Regulations of the Federal Communications Commission (FCC).
XT55/56 Hardware Interface Description Confidential / Preliminary 8.3 s Compliance with FCC Rules and Regulations (XT56 only) The FCC Equipment Authorization Certification for the XT56 reference application described in Chapter 8.1 is listed under the FCC identifier QIPXT56 IC: 267W-XT56 granted to Siemens AG. The XT56 reference application registered under the above identifier is certified to be in accordance with the following Rules and Regulations of the Federal Communications Commission (FCC).
XT55/56 Hardware Interface Description Confidential / Preliminary 9 s Example Applications The XT55/56 module offers different options for integrating additional software, such as AVL and SiRF Demo software. For further details refer to [1] and [4]. Figure 56: Block diagram of XT55/56 for SiRF Demo application XT55/56_hd_v02.96 Page 120 of 125 18.08.
XT55/56 Hardware Interface Description Confidential / Preliminary s Figure 57: Block diagram of XT55/56 with AVL application (optional) XT55/56_hd_v02.96 Page 121 of 125 18.08.
s XT55/56 Hardware Interface Description Confidential / Preliminary 1SS355 GPS antenna (3V) 3V3 + 470uF LiIon battery pack LDO ON/OFF 33pF 4 70 GSM antenna BATT+ 33pF 4V3 2.2uF CRS04 100nF SI3441DV + LNA 470k a 220k + *) 33pF Charger 3k3 220k NTC GPIO4 VCC RFPC1 GPIO8 XT55 XT56 VCC_RF *)E S D p ro tectio n e .g.
XT55/56 Hardware Interface Description Confidential / Preliminary s Figure 58 shows a sample application that incorporates an XT55/56 module and an external µC which controls the entire application. This µC must provide two asynchronous serial interfaces for controlling the XT55/56. One serial interface (TXD0, RXD0, CTS0, RTS0) controls the GSM part. The other serial interface (TXD1, RXD1) controls the GPS part of the XT55/56 module.
s XT55/56 Hardware Interface Description Confidential / Preliminary 10 List of Parts and Accessories Table 39: List of parts and accessories Description Supplier Ordering information Siemens Siemens ordering number: XT55 Standard module: L36880-N8390-A100 Customer IMEI SIM Lock mode: L36880-N8391-A100 XT56 Standard module: L36880-N8392-A100 Customer IMEI SIM Lock mode: L36880-N8393-A100 Siemens Car Kit Portable Siemens Siemens ordering number: L36880-N3015-A117 DSB45 Support Box Siemens
XT55/56 Hardware Interface Description Confidential / Preliminary s Table 40: Molex sales contacts (subject to change) Molex Molex Deutschland GmbH American Headquarters For further information please click: Felix-Wankel-Str. 11 4078 Heilbronn-Biberach Germany Lisle, Illinois 60532 U.S.A. http://www.molex.com/ Phone: +49-7066-9555 0 Fax: +49-7066-9555 29 Email: mxgermany@molex.com Molex China Distributors Beijing, Room 1319, Tower B, COFCO Plaza No. 8, Jian Guo Men Nei Street, 100005 Beijing P.R.
