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Siemens AC75 Hardware Interface Description

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AC75
Siemens Cellular Engine
Version:
00.202
DocID:
AC75_HD_V00.202

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Table of Contents

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   Summary of Contents for Siemens AC75

  • Page 1 AC75 Siemens Cellular Engine Version: 00.202 DocID: AC75_HD_V00.202...
  • Page 2 Product, even if Siemens has been advised of the possibility of such damages. Subject to change without notice at any time.
  • Page 3: Table Of Contents

    3.3.1.2 Configuring the IGT Line for Use as ON/OFF Switch ......29 3.3.1.3 Turn on AC75 Using the VCHARGE Signal...........30 3.3.1.4 Reset AC75 via AT+CFUN Command...........30 3.3.1.5 Reset or Turn off AC75 in Case of Emergency........31 3.3.1.6 Using EMERG_RST Signal to Reset Application(s) or External Device(s) .......................31 3.3.2...
  • Page 4 Characteristics of Audio Modes .............98 5.7.4 Voiceband Receive Path................99 5.7.5 Voiceband Transmit Path..............100 Air Interface .......................101 Electrostatic Discharge ..................102 Mechanics........................103 Mechanical Dimensions of AC75...............103 Mounting AC75 to the Application Platform ............105 Board-to-Board Application Connector ..............106 Sample Application....................109 AC75_HD_V00.202 Page 4 of 120 27.04.2006...
  • Page 5 Table 6: Signal states......................32 Table 7: Temperature dependent behavior ................38 Table 8: Specifications of battery packs suitable for use with AC75 ........43 Table 9: AT commands available in Charge-only mode............45 Table 10: Comparison Charge-only and Charge mode............46 Table 11: State transitions of AC75 (except SLEEP mode) ...........
  • Page 6 Figure 18: USB circuit ......................56 Figure 19: I2C interface connected to VCC of application ............. 59 Figure 20: I2C interface connected to VEXT line of AC75 ............. 60 Figure 21: SPI interface......................61 Figure 22: Characteristics of SPI modes................62 Figure 23: Audio block diagram....................63...
  • Page 7: Document History

    To change from Charge-only mode to Normal mode the IGT line must be pulled low 3.5.7, 3.7 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...
  • Page 8: Introduction

    Strictly confidential / Preliminary Introduction This document describes the hardware of the Siemens AC75 module that connects to the cellular device application and the air interface. It helps you quickly retrieve interface specifications, electrical and mechanical details and information on the requirements to be considered for integrating further components.
  • Page 9: Terms And Abbreviations

    Digital-to-Analog Converter Digital Audio Interface dBm0 Digital level, 3.14dBm0 corresponds to full scale, see ITU G.711, A-law Data Communication Equipment (typically modems, e.g. Siemens GSM engine) DCS 1800 Digital Cellular System, also referred to as PCN Discontinuous Reception Development Support Box...
  • Page 10 AC75 Hardware Interface Description Strictly confidential / Preliminary Abbreviation Description Electrostatic Discharge European Telecommunication Standard Federal Communications Commission (U.S.) FDMA Frequency Division Multiple Access Full Rate GMSK Gaussian Minimum Shift Keying GPIO General Purpose Input/Output GPRS General Packet Radio Service...
  • Page 11 AC75 Hardware Interface Description Strictly confidential / Preliminary Abbreviation Description Point-to-point protocol Phase Shift Keying Power Supply Unit R&TTE Radio and Telecommunication Terminal Equipment Random Access Memory Radio Frequency Root Mean Square (value) Read-only Memory Real Time Clock Request to Send...
  • Page 12: Type Approval

    Strictly confidential / Preliminary Type Approval AC75 is designed to comply with the directives and standards listed below. Please note that the product is still in a pre-release state and, therefore, type approval and testing procedures have not yet been completed.
  • Page 13: Table 3: Standards Of European Type Approval

    AC75 Hardware Interface Description Strictly confidential / Preliminary Table 3: Standards of European type approval 3GPP TS 51.010-1 Digital cellular telecommunications system (Phase 2); Mobile Station (MS) conformance specification ETSI Candidate Harmonized European Standard (Telecommunications V9.0.2 series) Global System for Mobile communications (GSM);...
  • Page 14: 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 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.
  • Page 15 AC75 Hardware Interface Description Strictly confidential / Preliminary Do not operate the cellular terminal or mobile in the presence of flammable gases or fumes. Switch off the cellular terminal when you are near petrol stations, fuel depots, chemical plants or where blasting operations are in progress.
  • Page 16: Product Concept

    AC75 Hardware Interface Description Strictly confidential / Preliminary Product Concept Key Features at a Glance Feature Implementation General Frequency bands Quad band: GSM 850/900/1800/1900MHz GSM class Small MS Output power Class 4 (+33dBm ±2dB) for EGSM850 (according to Class 4 (+33dBm ±2dB) for EGSM900 Release 99, V5) Class 1 (+30dBm ±2dB) for GSM1800...
  • Page 17 IP addresses IP version 6 Remote SIM Access AC75 supports Remote SIM Access. RSA enables AC75 to use a remote SIM card via its serial interface and an external application, in addition to the SIM card locally attached to the dedicated lines of the application interface.
  • Page 18 AC75 Hardware Interface Description Strictly confidential / Preliminary Feature Implementation Interfaces 2 serial interfaces ASC0: • 8-wire modem interface with status and control lines, unbalanced, asynchronous • Fixed bit rates: 300 bps to 460,800 bps • Autobauding: 1,200 bps to 460,800 bps •...
  • Page 19: Ac75 System Overview

    Digital-to-Analog Converter which can provide a PWM 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. AC75 System Overview AC75 Antenna Antenna...
  • Page 20: Circuit Concept

    AC75 Hardware Interface Description Strictly confidential / Preliminary Circuit Concept Figure 1 shows a block diagram of the AC75 module and illustrates the major functional components: Baseband block: • Digital baseband processor with DSP • Analog processor with power supply unit (PSU) •...
  • Page 21: Application Interface

    AC75 Hardware Interface Description Strictly confidential / Preliminary Application Interface AC75 is equipped with an 80-pin board-to-board connector that connects to the external application. The host interface incorporates several sub-interfaces described in the following chapters: • Power supply - see Section 3.1 •...
  • Page 22: Operating Modes

    AC75 Hardware Interface Description Strictly confidential / Preliminary Operating Modes The table below briefly summarizes the various operating modes referred to in the following chapters. Table 5: Overview of operating modes Normal operation GSM / GPRS SLEEP Various power save modes set with AT+CFUN command.
  • Page 23 AC75 Hardware Interface Description Strictly confidential / Preliminary Airplane mode Airplane mode shuts down the radio part of the module, causes the module to log off from the GSM/GPRS network and disables all AT commands whose execution requires a radio connection.
  • Page 24: Power Supply

    AC75 needs to be connected to a power supply at the B2B connector (5 pins each BATT+ and GND). The power supply of AC75 has to be a single voltage source at BATT+. It must be able to provide the peak current during the uplink transmission.
  • Page 25: Monitoring Power Supply By At Command

    RF interface. The duration of measuring ranges from 0.5s in TALK/DATA mode to 50s when AC75 is in IDLE mode or Limited Service (deregistered). The displayed voltage (in mV) is averaged over the last measuring period before the AT^SBV command was executed.
  • Page 26: Power-up / Power-down Scenarios

    Strictly confidential / Preliminary Power-Up / Power-Down Scenarios In general, be sure not to turn on AC75 while it is beyond the safety limits of voltage and temperature stated in Chapter 4.1. AC75 would immediately switch off after having started and detected these inappropriate conditions.
  • Page 27: Figure 5: Power-on With Operating Voltage At Batt+ Applied Before Activating Igt

    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”...
  • Page 28: Figure 6: Power-on With Igt Held Low Before Switching On Operating Voltage At Batt

    AC75 Hardware Interface Description Strictly confidential / Preliminary BATT+ = 400ms > PWR_IND 120ms EMERG_RST VEXT TXD0/TXD1/RTS0/RST1/DTR0 (driven by the application) CTS0/CTS1/DSR0/DCD0 Defined Undefined Interface pins ca. 500 ms Figure 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”...
  • Page 29: Configuring The Igt Line For Use As On/off Switch

    Switch-on condition: If the AC75 is off, the IGT line must be asserted for at least 400ms before being released. The module switches on after 400ms. Switch-off condition: If the AC75 is on, the IGT line must be asserted for at least 1s before being released. The module switches off after the line is released.
  • Page 30: Turn On Ac75 Using The Vcharge Signal

    Charge-only mode where only the charging algorithm will be 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.
  • Page 31: Reset Or Turn Off Ac75 In Case Of Emergency

    5 seconds. Pulling the EMERG_RST pin causes the loss of all information stored in the volatile memory. Therefore, this procedure is intended only for use in case of emergency, e.g. if AC75 does not respond, if reset or shutdown via AT command fails.
  • Page 32: Signal States After Startup

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.3.2 Signal States after Startup Table 6 describes the various states each interface pin passes through after startup and during operation. As shown in Figure 5 and Figure 6 the pins are in undefined state while the module is initializing.
  • Page 33 AC75 Hardware Interface Description Strictly confidential / Preliminary Abbreviations used in Table 6: L = Low output level PD = Pull down with min +15µA and max. +100µA H = High output level PD(…k) = Fix pull down resistor I = Input PU = Pull up with min -15µA and max.
  • Page 34: Turn Off Ac75

    The best and safest approach to powering down AC75 is to issue the AT^SMSO command. This procedure lets AC75 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.
  • Page 35: Leakage Current In Power-down Mode

    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 only 50µA. Therefore, in order to minimize the leakage current take care to start up the module at least once before it is powered down.
  • Page 36: Turn On/off Ac75 Applications With Integrated Usb

    3.3.3.3 Turn on/off AC75 Applications with Integrated USB In a Windows environment, the USB COM port emulation causes the USB port of AC75 to appear as a virtual COM port (VCOM port). The VCOM port emulation is only present when Windows can communicate with the module, and is lost when the module shuts down.
  • Page 37: Automatic Shutdown

    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 or back to normal, AC75 instantly displays an alert (if enabled).
  • Page 38: Deferred Shutdown At Extreme Temperature Conditions

    AC75 Hardware Interface Description Strictly confidential / Preliminary Table 7: Temperature dependent behavior Sending temperature alert (2min after AC75 start-up, otherwise only if URC presentation enabled) ^SCTM_A: 1 Caution: Battery close to overtemperature limit. ^SCTM_B: 1 Caution: Bboard close to overtemperature limit.
  • Page 39: Undervoltage Shutdown If No Battery Ntc Is Present

    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 presentation of URCs.
  • Page 40: Automatic Egprs/gprs Multislot Class Change

    This reduces the power consumption and, consequently, causes the board’s temperature to decrease. Once the temperature drops by 5 degrees, AC75 returns to the higher Multislot Class. If the temperature stays at the critical level or even continues to rise, AC75 will not switch back to the higher class.
  • Page 41: Charging Control

    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>...
  • Page 42: Battery Pack Requirements

    On the AC75 module, a built-in measuring circuit constantly monitors the supply voltage. In the event of undervoltage, it causes AC75 to power down. Undervoltage thresholds are specific to the battery pack and must be evaluated for the intended model. When you evaluate undervoltage thresholds, consider both the current consumption of AC75 and of the application circuit.
  • Page 43: Batteries Recommended For Use With Ac75

    3.5.4 Batteries Recommended for Use with AC75 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.
  • Page 44: Charger Requirements

    Duration of charging: • AC75 provides two charging timers: a software controlled timer set to 4 hours and a hardware controlled timer set to 4.66 hours. The duration of software controlled charging depends on the battery capacity and the level of discharge.
  • Page 45: Operating Modes During Charging

    The charging process during the Normal mode is referred to as Charge mode . If the charger is connected to the charger input of the external charging circuit and the module’s VCHARGE pin while AC75 is in Power-down mode, AC75 goes into Charge-only mode.
  • Page 46: Table 10: Comparison Charge-only And Charge Mode

    • Battery can be charged while GSM module application charging circuit and module’s remains operational and registered to the VCHARGE pin while AC75 is GSM network. • operating, e.g. in IDLE or TALK mode • In IDLE and TALK mode, the serial interfaces •...
  • Page 47: Power Saving

    This allows the AC75 to wake up for the duration of an event and, afterwards, to resume power saving. Please refer to [1] for a summary of all SLEEP modes and the different ways of waking up the module.
  • Page 48: Timing Of The Ctsx Signal In Cyclic Sleep Mode 7

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.6.2 Timing of the CTSx Signal in CYCLIC SLEEP Mode 7 Figure 11 illustrates the CTSx signal timing in CYCLIC SLEEP mode 7 (CFUN=7). Beginning of power saving CTSx 0.9...2.7 s 0.9...2.7 s...
  • Page 49: Summary Of State Transitions (except Sleep Mode)

    Strictly confidential / Preliminary Summary of State Transitions (Except SLEEP Mode) Table 11: State transitions of AC75 (except SLEEP mode) The table shows how to proceed from one mode to another (grey column = present mode, white columns = intended modes)
  • Page 50: Rtc Backup

    The internal Real Time Clock of AC75 is supplied from a separate voltage regulator in the analog controller which is also active when AC75 is in POWER DOWN status. An alarm function is provided that allows to wake up AC75 to Airplane mode without logging on to the GSM network.
  • Page 51: Sim Interface

    For example, this is true for the model supplied by Molex, which has been tested to operate with AC75 and is part of the Siemens reference equipment submitted for type approval. See Chapter 8 for Molex ordering numbers.
  • Page 52: Installation Advice

    Strictly confidential / Preliminary 3.9.1 Installation Advice The total cable length between the board-to-board connector pins on AC75 and the pins of the external SIM card holder must not exceed 100mm in order to meet the specifications of 3GPP TS 51.010-1 and to satisfy the requirements of EMC compliance.
  • Page 53: Serial Interface Asc0

    The significant levels are 0V (for low data bit or active state) and 2.9V (for high data bit or inactive state). For electrical characteristics please refer to Table 26. AC75 is designed for use as a DCE. Based on the conventions for DCE-DTE connections it communicates with the customer application (DTE) using the following signals: •...
  • Page 54: Table 13: Dce-dte Wiring Of Asc0

    AC75 Hardware Interface Description Strictly confidential / Preliminary Table 13: DCE-DTE wiring of ASC0 V.24 circuit Pin function Signal direction Pin function Signal direction TXD0 Input Output RXD0 Output Input RTS0 Input Output CTS0 Output Input 108/2 DTR0 Input Output...
  • Page 55: Serial Interface Asc1

    2.9V (for high data bit or inactive state). For electrical characteristics please refer to Table AC75 is designed for use as a DCE. Based on the conventions for DCE-DTE connections it communicates with the customer application (DTE) using the following signals: •...
  • Page 56: Usb Interface

    The USB host is responsible for supplying, across the VUSB_IN line, power to the module’s USB interface, but not to other AC75 interfaces. This is because AC75 is designed as a self- powered device compliant with the “Universal Serial Bus Specification Revision 2.0”...
  • Page 57: Installing The Usb Modem Driver

    Take care that the “usbmodem.inf” file delivered with AC75 is at hand. Connect the USB cable to the AC75 host application (for example the evaluation board DSB75) and the PC.
  • Page 58 AC75 Hardware Interface Description Strictly confidential / Preliminary You can find the “Siemens AG WM USB Modem” listed under Control Panel | Phone and Modem Options | Modems. Troubleshooting for installation problems Windows fails assign the next free COM port to AC75 and,...
  • Page 59: I 2 C Interface

    C is a serial, 8-bit oriented data transfer bus for bit rates up to 400kbps in Fast mode. It consists of two lines, the serial data line I2CDAT and the serial clock line I2CCLK. The AC75 module acts as a single master device, e.g. the clock I2CCLK is driven by module. I2CDAT is a bi-directional line.
  • Page 60: Figure 20: I2c Interface Connected To Vext Line Of Ac75

    I2CCLK Figure 20: I 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: Spi Interface

    It consists of four lines, the two data lines SPIDI/SPIDO, the clock line SPICLK and the chip select line SPICS. The AC75 module acts as a single master device, e.g. the clock SPICLK is driven by module. Whenever the SPICS pin is in a low state, the SPI bus is activated and data can be transferred from the module and vice versa.
  • Page 62: Figure 22: Characteristics Of Spi Modes

    AC75 Hardware Interface Description Strictly confidential / Preliminary Clock phase SPI MODE 0 SPI MODE 1 SPICS SPICS SPICLK SPICLK SPIDO SPIDO SPIDI SPIDI Sample Sample SPI MODE 2 SPI MODE 3 SPICS SPICS SPICLK SPICLK SPIDO SPIDO SPIDI SPIDI...
  • Page 63: Audio Interfaces

    2. Audio mode 5 can be used for direct access to the speech coder without signal pre or post processing. When shipped from factory, all audio parameters of AC75 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.
  • Page 64: Speech Processing

    While AC75 is in Power-down mode, the input voltage at any MIC pin must not exceed ±0.3V relative to AGND (see also section 5.1). In any other operating state the voltage applied to any MIC pin must be in the range of +2.7V to -0.3V, otherwise undervoltage shutdown may...
  • Page 65: Single-ended Microphone Input

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.2.1 Single-ended Microphone Input Figure 24 as well as Figure 46 show an example of how to integrate a single-ended microphone input. = typ. 2k VMIC = typ. 5k = typ. 470Ohm...
  • Page 66: Differential Microphone Input

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.2.2 Differential Microphone Input Figure 25 shows a differential solution for connecting an electret microphone. = typ. 1k VMIC = 470Ohm VMIC VMIC = typ. 100nF = typ. 22µF MICPx = typ. 2.5V = 1.0V …...
  • Page 67: Line Input Configuration With Opamp

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.2.3 Line Input Configuration with OpAmp Figure 26 shows an example of how to connect an opamp into the microphone circuit. = typ. 47k VMIC = 470Ohm VMIC VMIC = typ. 100nF = typ.
  • Page 68: Loudspeaker Circuit

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.3 Loudspeaker Circuit The GSM module comprises two analog speaker outputs: EP1 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.
  • Page 69: Digital Audio Interface (dai)

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.4 Digital Audio Interface (DAI) The DAI can be used to connect audio devices capable of PCM (Pulse Code Modulation) or for type approval. The following chapters describe the PCM interface functionality.
  • Page 70: Master Mode

    AC75 Hardware Interface Description Strictly confidential / Preliminary Table 16 shows the assignment of the DAI0…6 pins to the PCM interface signals. To avoid hardware conflicts different pins are used as inputs and outputs for frame sync and clock signals in master or slave operation. The table shows also which pin is used for master or slave.
  • Page 71: Figure 29: Short Frame Pcm Timing

    AC75 Hardware Interface Description Strictly confidential / Preliminary The timing of a PCM short frame is shown in Figure 29. 16-bit data are transferred in both directions at the same time during the first 16 clock cycles after the frame sync pulse. The duration of a frame sync pulse is one BITCLK period, starting at the rising edge of BITCLK.
  • Page 72: Slave Mode

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.4.2 Slave Mode In slave mode the PCM interface is controlled by the external bit clock and the external frame sync signal applied to the pins BCLKIN and FSIN. If the short frame format is selected, the data transfer starts with the falling edge of FSIN, otherwise the rising edge is used.
  • Page 73: Figure 32: Slave Pcm Timing, Short Frame Selected

    AC75 Hardware Interface Description Strictly confidential / Preliminary 125 µs BCLKIN FSIN TXDAI RXDAI Figure 32: Slave PCM Timing, Short Frame selected 125 µs BCLKIN FSIN TXDAI RXDAI Figure 33: Slave PCM Timing, Long Frame selected AC75_HD_V00.202 Page 73 of 120...
  • Page 74: Gpio Interface

    3.16 GPIO Interface The AC75 has 10 GPIOs for external hardware devices. Each GPIO can be configured for use as input or output. All settings are AT command controlled. The GIPO related AT commands are the following: AT^SPIO, AT^SCPIN, AT^SCPOL, AT^SCPORT, AT^SDPORT, AT^SGIO, AT^SSIO.
  • Page 75: Control Signals

    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.
  • Page 76: Using The Sync Pin To Control A Status Led

    As an alternative to generating the synchronization signal, the SYNC pin can be configured to drive a status LED that indicates different operating modes of the AC75 module. To take advantage of this function the LED mode must be activated with the AT^SSYNC command and the LED must be connected to the host application.
  • Page 77: Behavior Of The Ring0 Line (asc0 Interface Only)

    AC75 Hardware Interface Description Strictly confidential / Preliminary 3.17.3 Behavior of the RING0 Line (ASC0 Interface only) The RING0 line is available on the first serial interface ASC0 (see also Chapter 3.10). The signal serves to indicate incoming calls and other types of URCs (Unsolicited Result Code).
  • Page 78: Antenna Interface

    AC75 Hardware Interface Description Strictly confidential / Preliminary Antenna Interface The RF interface has an impedance of 50Ω. AC75 is capable of sustaining a total mismatch at the antenna connector without any damage, even when transmitting at maximum RF power.
  • Page 79: Antenna Diagnostic

    AC75 Hardware Interface Description Strictly confidential / Preliminary Antenna Diagnostic The antenna diagnostic allows the customer to check the presence and the connection status of the antenna by using the AT^SAD command. A description of the AT^SAD command can be found in [1].
  • Page 80: Antenna Connector

    AC75 Hardware Interface Description Strictly confidential / Preliminary Antenna Connector AC75 uses a subminiature coaxial antenna connector type SMP MIL-Std 348-A supplied from Rosenberger. Table 19: Product specifications of Rosenberger SMP connector Item Specification Conditions Material and finish Center contact Brass 0.8 µm gold plating over 2-4 µm NiP...
  • Page 81: Figure 39: Datasheet Of Rosenberger Smp Mil-std 348-a Connector

    AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 39: Datasheet of Rosenberger SMP MIL-Std 348-A connector AC75_HD_V00.202 Page 81 of 120 27.04.2006...
  • Page 82: Electrical, Reliability And Radio Characteristics

    Electrical, Reliability and Radio Characteristics Absolute Maximum Ratings The absolute maximum ratings stated in Table 20 are stress ratings under any conditions. Stresses beyond any of these limits will cause permanent damage to AC75. Table 20: Absolute maximum ratings Parameter...
  • Page 83: Operating Temperatures

    • 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.
  • Page 84: Storage Conditions

    AC75 Hardware Interface Description Strictly confidential / Preliminary Storage Conditions The conditions stated below are only valid for modules in their original packed state in weather protected, non-temperature-controlled storage locations. Normal storage time under these conditions is 12 months maximum.
  • Page 85: Reliability Characteristics

    AC75 Hardware Interface Description Strictly confidential / Preliminary Reliability Characteristics The test conditions stated below are an extract of the complete test specifications. Table 25: Summary of reliability test conditions Type of test Conditions Standard Vibration Frequency range: 10-20Hz; acceleration: 3.1mm...
  • Page 86: Pin Assignment And Signal Description

    Strictly confidential / Preliminary Pin Assignment and Signal Description The Molex board-to-board connector on AC75 is an 80-pin double-row receptacle. The names and the positions of the pins can be seen from Figure 1 which shows the top view of AC75.
  • Page 87: Table 26: Signal Description

    AC75 Hardware Interface Description Strictly confidential / Preliminary Please note that the reference voltages listed in Table 26 are the values measured directly on the AC75 module. They do not apply to the accessories connected. Table 26: Signal description Function...
  • Page 88 Pull down and max = 0.2V at Imax = -0.5mA release EMERG_RST. Then, min = 1.75V activating IGT for 400ms will max = 3.05V reset AC75. If IGT is not activated for 400ms, AC75 Pull down ≥ 10ms Signal |______| switches off.
  • Page 89 180µs forward time. handover. b) Driving a status LED to indicate different operating modes of AC75. The LED must be installed in the host application. To select a) or b) use the AT^SSYNC command. If unused keep pin open.
  • Page 90 AC75 Hardware Interface Description Strictly confidential / Preliminary Function Signal name IO Signal form and level Comment SIM interface CCIN CCIN = Low, SIM card holder ≈ 100kΩ specified for closed max = 0.6V at I = -25µA use with 3V min = 2.1V at I = -10µA...
  • Page 91 AC75 Hardware Interface Description Strictly confidential / Preliminary Function Signal name IO Signal form and level Comment C interface I2CDAT_SPIDO I/O V max = 0.2V at I = 2mA I2CDAT is configured as max = 0.8V Open Drain and needs a pull- min = 2.15V...
  • Page 92 AC75 Hardware Interface Description Strictly confidential / Preliminary Function Signal name IO Signal form and level Comment GPIO8 Alternatively, the GPIO10 pin Pulse counter: can be configured as a pulse GPIO9 pulse counter for pulse rates from 0 ~~~~~~~~~~~~~ GPIO10...
  • Page 93: Power Supply Ratings

    AC75 Hardware Interface Description Strictly confidential / Preliminary Power Supply Ratings Table 27: Power supply ratings Parameter Description Conditions Unit BATT+ Supply voltage Directly measured at reference point TP BATT+ and TP GND, see chapter 3.2.2 Voltage must stay within the min/max values, including voltage drop, ripple, spikes.
  • Page 94: Table 28: Current Consumption During Tx Burst For Gsm 850mhz And Gsm 900mhz

    AC75 Hardware Interface Description Strictly confidential / Preliminary Table 28: Current consumption during Tx burst for GSM 850MHz and GSM 900MHz Mode GSM call GPRS GPRS Class10 GPRS Class 12 EGPRS EGPRS Class 10 Class 8 Class 8 1Tx / 1Rx...
  • Page 95: Table 29: Current Consumption During Tx Burst For Gsm 1800mhz And Gsm 1900mhz

    AC75 Hardware Interface Description Strictly confidential / Preliminary Table 29: Current consumption during Tx burst for GSM 1800MHz and GSM 1900MHz GPRS EGPRS Mode GSM call GPRS Class10 GPRS Class 12 EGPRS Class 10 Class 8 Class 8 Timeslot 1Tx / 1Rx...
  • Page 96: Electrical Characteristics Of The Voiceband Part

    AC75 Hardware Interface Description Strictly confidential / Preliminary Electrical Characteristics of the Voiceband Part 5.7.1 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.
  • Page 97: Audio Programming Model

    AC75 Hardware Interface Description Strictly confidential / Preliminary 5.7.2 Audio Programming Model The audio programming model shows how the signal path can be influenced by varying the AT command parameters. The parameters inBbcGain and inCalibrate can be set with AT^SNFI. All the other parameters are adjusted with AT^SNFO.
  • Page 98: Characteristics Of Audio Modes

    Audio mode 5 and 6 are identical. AT^SAIC can be used to switch mode 5 to the second interface. Audio mode 6 is therefore kept mainly for compatibility to earlier Siemens GSM products. In audio modes with an active loss controller a continuous sine signal is attenuated by the idle attenuation after a few seconds.
  • Page 99: Voiceband Receive Path

    AC75 Hardware Interface Description Strictly confidential / Preliminary 5.7.4 Voiceband Receive Path Test conditions: • The values specified below were tested to 1kHz with default audio mode settings, unless otherwise stated. • Default audio mode settings are: mode=5 for EPP1 to EPN1 and mode=6 for EPP2 to EPN2, inBbcGain=0, inCalibrate=32767, outBbcGain=0, OutCalibrate=16384 (volume=4) or OutCalibrate=11585 (volume=3), sideTone=0.
  • Page 100: Voiceband Transmit Path

    AC75 Hardware Interface Description Strictly confidential / Preliminary Parameter Unit Test condition / remark Frequency Response 0Hz - 100Hz 200Hz -1.1 300Hz - 3350Hz -0.2 3400Hz -0.7 4000Hz ≥4400Hz gs = gain setting 5.7.5 Voiceband Transmit Path Test conditions: •...
  • Page 101: Air Interface

    Test conditions: All measurements have been performed at T = 25°C, V = 4.0V. BATT+ nom The reference points used on AC75 are the BATT+ and GND contacts (test points are shown in Figure 4). Table 34: Air Interface Parameter...
  • Page 102: Electrostatic Discharge

    Antenna interface: one spark discharge line (spark gap) SIM interface: clamp diodes for protection against overvoltage. The 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”...
  • Page 103: Mechanics

    AC75 Hardware Interface Description Strictly confidential / Preliminary Mechanics 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...
  • Page 104: Figure 43: Dimensions Of Ac75

    AC75 Hardware Interface Description Strictly confidential / Preliminary All dimensions in mm Figure 43: Dimensions of AC75 AC75_HD_V00.202 Page 104 of 120 27.04.2006...
  • Page 105: Mounting Ac75 To The Application Platform

    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.
  • Page 106: Board-to-board Application Connector

    AC75 Hardware Interface Description Strictly confidential / Preliminary Board-to-Board Application Connector This section provides the specifications of the 80-pin board-to-board connector used to connect AC75 to the external application. Connector mounted on the AC75 module: Type: 52991-0808 SlimStack Receptacle 80 pins, 0.50mm pitch, for stacking heights from 3.0 to 4.0mm,...
  • Page 107: Figure 44: Molex Board-to-board Connector 52991-0808 On Ac75

    AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 44: Molex board-to-board connector 52991-0808 on AC75 AC75_HD_V00.202 Page 107 of 120 27.04.2006...
  • Page 108: Figure 45: Mating Board-to-board Connector 53748-0808 On Application

    AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 45: Mating board-to-board connector 53748-0808 on application AC75_HD_V00.202 Page 108 of 120 27.04.2006...
  • Page 109: Sample Application

    The internal pull-up resistors (Rp) of the I 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 I CI interface is shut down as well.
  • Page 110: Figure 46: Ac75 Sample Application For Java

    AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 46: AC75 sample application for Java AC75_HD_V00.202 Page 110 of 120 27.04.2006...
  • Page 111: Reference Approval

    AC75 Hardware Interface Description Strictly confidential / Preliminary Reference Approval Reference Equipment for Type Approval The Siemens reference setup submitted to type approve AC75 consists of the following components: • Siemens AC75 cellular engine • Development Support Box DSB75 •...
  • Page 112: Compliance With Fcc Rules And Regulations

    FCC identifier QIPAC75 IC: 267W-AC75 granted to Siemens AG. The AC75 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). Power listed is ERP for Part 22 and EIRP for Part 24 “This device contains GSM, GPRS Class12 and EGPRS Class 10 functions in the 900...
  • Page 113: Appendix

    AC75 Hardware Interface Description Strictly confidential / Preliminary Appendix List of Parts and Accessories Table 37: List of parts and accessories Description Supplier Ordering information AC75 Siemens Siemens ordering number: L36880-N8330-A100 Siemens Car Kit Portable Siemens Siemens ordering number: L36880-N3015-A117...
  • Page 114: Table 38: Molex Sales Contacts (subject To Change)

    AC75 Hardware Interface Description Strictly confidential / Preliminary Table 38: Molex sales contacts (subject to change) Molex Molex Deutschland GmbH American Headquarters For further information Felix-Wankel-Str. 11 Lisle, Illinois 60532 please click: 4078 Heilbronn-Biberach U.S.A. http://www.molex.com/ Germany Phone: +1-800-78MOLEX Phone: +49-7066-9555 0...
  • Page 115: Fasteners And Fixings For Electronic Equipment

    AC75 Hardware Interface Description Strictly confidential / Preliminary Fasteners and Fixings for Electronic Equipment This section provides a list of suppliers and manufacturers offering fasteners and fixings for electronic equipment and PCB mounting. The content of this section is designed to offer basic guidance to various mounting solutions with no warranty on the accuracy and sufficiency of the information supplied.
  • Page 116 AC75 Hardware Interface Description Strictly confidential / Preliminary Article number: 07.51.403 Insulating Spacer for M2 Self-gripping Length 3.0mm Material 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...
  • Page 117 AC75 Hardware Interface Description Strictly confidential / Preliminary Article number: 01.14.131 Screw M2 DIN 84 - ISO 1207 Length 8.0mm Material Steel 4.8 Surface Zinced A2K Thread 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...
  • Page 118: Data Sheets Of Recommended Batteries

    AC75 Hardware Interface Description Strictly confidential / Preliminary Article number: 02.10.011 Hexagon Nut DIN 934 - ISO 4032 Material Steel 4.8 Surface Zinced A2K Thread Wrench size / Ø Thickness / L 1.6mm Type Nut DIN/UNC, DIN934 2 nuts are delivered with DSB75 Support Board Data Sheets of Recommended Batteries The following two data sheets have been provided by VARTA Microbattery GmbH.
  • Page 119: Figure 48: Lithium Ion Battery From Varta

    AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 48: Lithium Ion battery from VARTA AC75_HD_V00.202 Page 119 of 120 27.04.2006...
  • Page 120: Figure 49: Varta Poliflex┬« Lithium Polymer Battery

    AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 49: VARTA PoLiFlex® Lithium Polymer battery AC75_HD_V00.202 Page 120 of 120 27.04.2006...

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