AC75 Siemens Cellular Engine Version: DocID: 00.202 AC75_HD_V00.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Document Name: AC75 Hardware Interface Description Version: 00.202 Date: April 27, 2006 DocId: AC75_HD_V00.202 Status: Strictly confidential / Preliminary General note Product is deemed accepted by Recipient and is provided without interface to Recipient´s products. The Product constitutes pre-release version and code and may be changed substantially before commercial release.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Contents 0 Document History .........................................................................................................7 1 Introduction ...................................................................................................................8 1.1 Related Documents ...............................................................................................8 1.2 Terms and Abbreviations....................
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 s Summary of State Transitions (Except SLEEP Mode).........................................49 RTC Backup ........................................................................................................50 SIM Interface .......................................................................................................51 3.9.1 Installation Advice ...........................
AC75 Hardware Interface Description Strictly confidential / Preliminary s 8 Reference Approval ..................................................................................................111 8.1 Reference Equipment for Type Approval...........................................................111 8.2 Compliance with FCC Rules and Regulations ...................................................112 9 Appendix...............................................................................................
AC75 Hardware Interface Description Strictly confidential / Preliminary s Figures Figure 1: AC75 system overview............................................................................................19 Figure 2: AC75 block diagram................................................................................................20 Figure 3: Power supply limits during transmit burst................................................................
AC75 Hardware Interface Description Strictly confidential / Preliminary 0 s Document History Preceding document: "AC75 Hardware Interface Description" Version 00.020 New document: "AC75 Hardware Interface Description" Version 00.202 Chapter What is new 3.3.2 New chapter: Signal States after Startup. 3.3.1.1 More detailed description of IGT timing depending on Power-down or Charge-only mode. Added further details on timing after power-up. Added alert message “SHUTDOWN after Illegal PowerUp” 3.3.1.
AC75 Hardware Interface Description Strictly confidential / Preliminary 1 s 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. 1.1 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] Related Documents AC75 AT Command Set 00.
AC75 Hardware Interface Description Strictly confidential / Preliminary 1.2 s Terms and Abbreviations Abbreviation Description ADC Analog-to-Digital Converter AGC Automatic Gain Control ANSI American National Standards Institute ARFCN Absolute Radio Frequency Channel Number ARP Antenna Reference Point ASC0 / ASC1 Asynchronous Controller.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Abbreviation Description ESD Electrostatic Discharge ETS European Telecommunication Standard FCC Federal Communications Commission (U.S.
AC75 Hardware Interface Description Strictly confidential / Preliminary Abbreviation Description PPP Point-to-point protocol PSK Phase Shift Keying PSU Power Supply Unit R&TTE Radio and Telecommunication Terminal Equipment RAM Random Access Memory RF Radio Frequency RMS Root Mean Square (value) ROM Read-only Memory RTC Real Time Clock RTS Request to Send Rx Receive Direction SAR Specific Absorption Rate SELV Safety Extra Low Voltage SIM Subscriber Identification Module SMS Sh
AC75 Hardware Interface Description Strictly confidential / Preliminary 1.3 s 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.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Table 3: Standards of European type approval 3GPP TS 51.010-1 ETSI EN V9.0.2 301 GCF-CC V3.16.
AC75 Hardware Interface Description Strictly confidential / Preliminary s SAR requirements specific to portable mobiles Mobile phones, PDAs or other portable transmitters and receivers incorporating a GSM module must be in accordance with the guidelines for human exposure to radio frequency energy. This requires the Specific Absorption Rate (SAR) of portable AC75 based applications to be evaluated and approved for compliance with national and/or international regulations.
AC75 Hardware Interface Description Strictly confidential / Preliminary s 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. Operation of any electrical equipment in potentially explosive atmospheres can constitute a safety hazard.
AC75 Hardware Interface Description Strictly confidential / Preliminary 2 Product Concept 2.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Feature Implementation SMS • • • • • Fax Group 3; Class 1 Audio Speech codecs: • Half rate HR (ETS 06.20) • Full rate FR (ETS 06.10) • Enhanced full rate EFR (ETS 06.50/06.60/06.
AC75 Hardware Interface Description Strictly confidential / Preliminary Feature s 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 • RTS0/CTS0 and XON/XOFF flow control. • Multiplex ability according to GSM 07.10 Multiplexer Protocol.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Feature Implementation Pulse counter Pulse counter for measuring pulse rates from 0 to 1000 pulses per second. If the pulse counter is active the GPIO10 pin is not available. DAC output Digital-to-Analog Converter which can provide a PWM signal.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 2.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3 s 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 Charger interface – see Section 3.5 SIM interface - see Section 3.9 Serial interface ASC0 - see Section 3.10 Serial interface ASC1 - see Section 3.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.1 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 POWER DOWN AC75_HD_V00.202 GSM / GPRS SLEEP Various power save modes set with AT+CFUN command. Software is active to minimum extent.
AC75 Hardware Interface Description Strictly confidential / Preliminary Airplane mode s 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. Airplane mode can be controlled by using the AT commands AT^SCFG and AT+CALA: • With AT^SCFG=MEopMode/Airplane/OnStart the module can be configured to enter the Airplane mode each time when switched on or reset.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.2 s 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. All the key functions for supplying power to the device are handled by the power management section of the analog controller.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Example: If the length of the flex cable reaches the maximum length of 100mm, this connection may cause, for example, a resistance of 30mΩ in the BATT+ line and 30mΩ in the GND line. As a result, a 2A transmit burst would add up to a total voltage drop of 120mV.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.3 s 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. In extreme cases this can cause permanent damage to the module. 3.3.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Assertion of 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” or “^SYSSTART AIRPLANE MODE” which notifies the host application that the first AT command can be sent to the module. The duration until this URC is output varies with the SIM card and may take a couple of seconds.
s AC75 Hardware Interface Description Strictly confidential / Preliminary BATT+ tmin = >400ms HiZ IGT PWR_IND 120ms EMERG_RST VEXT TXD0/TXD1/RTS0/RST1/DTR0 (driven by the application) CTS0/CTS1/DSR0/DCD0 Undefined Defined Interface pins ca.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.3.1.2 Configuring the IGT Line for Use as ON/OFF Switch The IGT line can be configured for use in two different switching modes: You can set the IGT line to switch on the module only, or to switch it on and off. The switching mode is determined by the parameter “MEShutdown/OnIgnition” of the AT^SCFG command. This approach is useful for application manufacturers who wish to have an ON/OFF switch installed on the host device.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.3.1.3 s Turn on AC75 Using the VCHARGE Signal As detailed in Section 3.5.7, the charging adapter can be connected regardless of the module’s operating mode. If the charger is connected to the charger input of the external charging circuit and the module’s VCHARGE pin while AC75 is off, and the battery voltage is above the undervoltage lockout threshold, processor controlled fast charging starts (see Section 3.5.6).
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.3.1.5 s Reset or Turn off AC75 in Case of Emergency Caution: Use the EMERG_RST pin only when, due to serious problems, the software is not responding for more than 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.
s 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. Once the startup initialization has completed, i.e. when CTS is high and the software is running, all pins are in defined state.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Abbreviations used in Table 6: L = Low output level H = High output level I = Input O = Output AC75_HD_V00.202 PD = Pull down with min +15µA and max. +100µA PD(…k) = Fix pull down resistor PU = Pull up with min -15µA and max. -100µA PU(…k) = Fix pull up resistor Page 33 of 120 27.04.
AC75 Hardware Interface Description Strictly confidential / Preliminary s 3.3.3 Turn off AC75 AC75 can be turned off as follows: • Normal shutdown: Software controlled by AT^SMSO command • Automatic shutdown: Takes effect if board or battery temperature is out of range or if undervoltage or overvoltage conditions occur. 3.3.3.1 Turn off AC75 Using AT Command The best and safest approach to powering down AC75 is to issue the AT^SMSO command.
s AC75 Hardware Interface Description Strictly confidential / Preliminary PWR_IND See note 1 VEXT CTS0/CTS1/DSR0/DTR0 TXD0/TXD1/RTS0/RTS1/DTR0 (driven by the application) Defined Undefined Interface pins Figure 8: Signal states during turn-off procedure Note 1: Depending on capacitance load from host application 3.3.3.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.3.3.3 s 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.
AC75 Hardware Interface Description Strictly confidential / Preliminary s 3.3.4 Automatic Shutdown Automatic shutdown takes effect if: • the AC75 board is exceeding the critical limits of overtemperature or undertemperature • the battery is exceeding the critical limits of overtemperature or undertemperature • undervoltage or overvoltage is detected See Charge-only mode described in section 3.5.7 for exceptions.
AC75 Hardware Interface Description Strictly confidential / Preliminary s 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. ^SCTM_A: -1 Caution: Battery close to undertemperature limit. ^SCTM_B: -1 Caution: Board close to undertemperature limit.
AC75 Hardware Interface Description Strictly confidential / Preliminary s The message will be reported, for example, when you attempt to make a call while the voltage is close to the shutdown threshold of 3.2V and further power loss is caused during the transmit burst. In IDLE mode, the shutdown threshold is the sum of the module’s minimum supply voltage (3.2V) and the value of the maximum voltage drop resulting from earlier calls.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.4 s Automatic EGPRS/GPRS Multislot Class Change Temperature control is also effective for operation in EGPRS Multislot Class 10, GPRS Multislot Class 10 and GPRS Multislot Class 12.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.5 s Charging Control AC75 integrates a charging management for rechargeable Lithium Ion and Lithium Polymer batteries. You can skip this chapter if charging is not your concern, or if you are not using the implemented charging algorithm. The following sections contain an overview of charging and battery specifications.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.5.3 Battery Pack Requirements The charging algorithm has been optimized for rechargeable Lithium batteries that meet the characteristics listed below and in Table 8. It is recommended that the battery pack you want to integrate into your AC75 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.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Table 8: Specifications of battery packs suitable for use with AC75 Battery type Rechargeable Lithium Ion or Lithium Polymer battery Nominal voltage 3.6V / 3.7V Capacity Recommended: 1000mAh to 1200mAh Minimum: 500mAh NTC 10kΩ ± 5% @ 25°C approx. 5kΩ @ 45°C approx. 26.2kΩ @ 0°C B value range: B (25/85)=3423K to B =3435K ± 3% Overcharge detection voltage 4.325 ± 0.025V Overdischarge detection voltage 2.5 ± 0.
AC75 Hardware Interface Description Strictly confidential / Preliminary s 3.5.5 Charger Requirements For using the implemented charging algorithm and the reference charging circuit recommended in [4] and in Figure 46, the charger has to meet the following requirements: Output voltage: 5.2Volts ±0.2V (stabilized voltage) Output current: 500mA Chargers with a higher output current are acceptable, but please consider that only 500mA will be applied when a 0.
AC75 Hardware Interface Description Strictly confidential / Preliminary s 3.5.7 Operating Modes during Charging Of course, the battery can be charged regardless of the engine's operating mode. When the GSM module 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.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Table 10: Comparison Charge-only and Charge mode Charge-only mode Charge mode How to activate mode Description of mode Connect charger to charger input of host • 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.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.6 Power Saving Intended for power saving, SLEEP mode reduces the functionality of the AC75 to a minimum and thus minimizes the current consumption. Settings can be made using the AT+CFUN command. For details see [1]. SLEEP mode falls in two categories: • • NON-CYCLIC SLEEP mode: AT+CFUN = 0 CYCLIC SLEEP modes, AT+CFUN = 7 or 9. The functionality level AT+CFUN=1 is where power saving is switched off.
s 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 2s 1st character 0.9...2.7 s Last character AT interface disabled AT interface enabled Figure 11: Timing of CTSx signal (if CFUN= 7) With regard to programming or using timeouts, the UART must take the varying CTS inactivity periods into account. 3.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.8 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.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.9 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 SIM interface supports 3V and 1.8V SIM cards.
AC75 Hardware Interface Description Strictly confidential / Preliminary s 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. To avoid possible cross-talk from the CCCLK signal to the CCIO signal be careful that both lines are not placed closely next to each other.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.10 Serial Interface ASC0 AC75 offers an 8-wire unbalanced, asynchronous modem interface ASC0 conforming to ITUT V.24 protocol DCE signalling. The electrical characteristics do not comply with ITU-T V.28. 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.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Table 13: DCE-DTE wiring of ASC0 V.24 circuit DCE DTE Pin function Signal direction Pin function Signal direction 103 TXD0 Input TXD Output 104 RXD0 Output RXD Input 105 RTS0 Input RTS Output 106 CTS0 Output CTS Input 108/2 DTR0 Input DTR Output 107 DSR0 Output DSR Input 109 DCD0 Output DCD Input 125 RING0 Output RING Input AC75_HD_V00.202 Page 54 of 120 27.04.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.11 Serial Interface ASC1 The ASC1 interface is available as a 4-wire unbalanced, asynchronous modem interface ASC1 conforming to ITU-T V.24 protocol DCE signalling. The electrical characteristics do not comply with ITU-T V.28. 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.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.12 USB Interface AC75 supports a USB 2.0 Full Speed (12Mbit/s) device interface. It can be operated on a USB 2.0 Full Speed or High Speed root hub (a PC host), but not on a generic USB 2.0 High Speed hub which translates High Speed (480 Mbit/s/) to Full Speed (12 Mbit/s). The USB port has different functions depending on whether or not Java is running.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.12.1 s Installing the USB Modem Driver This section assumes you are familiar with installing and configuring a modem under Windows 2000 and Windows XP. As both operating systems use multiple methods to access modem settings this section provides only a brief summary of the most important steps. Take care that the “usbmodem.inf” file delivered with AC75 is at hand.
AC75 Hardware Interface Description Strictly confidential / Preliminary s You can find the “Siemens AG WM USB Modem” listed under Control Panel | Phone and Modem Options | Modems.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.13 I2C Interface I2C 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.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Application GSM module VEXT Rp I2CDAT I2CCLK GND Rp I2CDAT I2CCLK GND Figure 20: I2C 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. AC75_HD_V00.202 Page 60 of 120 27.04.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.14 s SPI Interface The SPI (serial peripheral interface) is a synchronous serial interface for control and data transfer between the AC75 module and the connected application. Only one application can be connected to the module’s SPI. The interface supports transmission rates up to 6.5Mbit/s. It consists of four lines, the two data lines SPIDI/SPIDO, the clock line SPICLK and the chip select line SPICS.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Clock phase SPI MODE 0 SPI MODE 1 SPICS SPICLK SPICLK SPIDO SPIDO SPIDI SPIDI Clock polarity SPICS Sample Sample SPI MODE 2 SPI MODE 3 SPICS SPICS SPICLK SPICLK SPIDO SPIDO SPIDI SPIDI Sample Sample Figure 22: Characteristics of SPI modes AC75_HD_V00.202 Page 62 of 120 27.04.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15 Audio Interfaces AC75 comprises three audio interfaces available on the board-to-board connector: • Two analog audio interfaces, both with balanced or single-ended inputs/outputs. • Serial digital audio interface (DAI) designed for PCM (Pulse Code Modulation). This means you can connect up to three different audio devices, although only one interface can be operated at a time.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.1 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 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. RA = typ. 2k RB = typ. 5k RVMIC = typ. 470Ohm VMIC RA RA RVMIC Ck = typ. 100nF CF = typ. 22µF MICPx VMIC = typ. 2.5V VBias CF GSM module MICNx RB Vbias = 1.0V … 1.6V, typ. 1.
s 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. RA = typ. 1k RVMIC = 470Ohm VMIC RVMIC CK = typ. 100nF CF = typ. 22µF RA MICPx CF VMIC = typ. 2.5V GSM module Vbias = 1.0V … 1.6V, typ. 1.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.2.3 s Line Input Configuration with OpAmp Figure 26 shows an example of how to connect an opamp into the microphone circuit. RA = typ. 47k RVMIC = 470Ohm VMIC RA CK RVMIC Ck = typ. 100nF CF = typ. 22µF MICPx ~ VMIC = typ. 2.5V RA CK GSM module MICNx CF Vbias = typ. ½ VMIC = 1.25V VBias AGND Figure 26: Line input configuration with OpAmp The AC source (e.g.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.15.3 s 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. Figure 27 shows an example of a differential loudspeaker configuration. Loudspeaker impedance EPP1/EPN1 ZL = typ. 8Ohm EPP2/EPN2 ZL = typ.
s 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. The PCM functionality allows the use of a codec like for example the MC145483. This codec replaces the analog audio inputs and outputs during a call, if digital audio is selected by AT^SAIC.
s 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. The data pins (TXDAI and RXDAI) however are used in both modes. Unused inputs have to be tied to GND, unused outputs must be left open.
s 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. TXDAI data is shifted out at the next rising edge of BITCLK. Data transmitted from RXDAI of the internal application is sampled at the falling edge of BITCLK.
s 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. With this edge control the frame sync signal is independent of the frame sync pulse length.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 125 µs BCLKIN FSIN TXDAI MSB 14 13 12 2 1 LSB MSB RXDAI MSB 14 13 12 2 1 LSB MSB Figure 32: Slave PCM Timing, Short Frame selected 125 µs BCLKIN FSIN TXDAI MSB 14 13 12 2 1 LSB MSB RXDAI MSB 14 13 12 2 1 LSB MSB Figure 33: Slave PCM Timing, Long Frame selected AC75_HD_V00.202 Page 73 of 120 27.04.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.16 s 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. A detailed description can be found in [1]. 3.16.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.17 3.17.1 s Control Signals Synchronization Signal The synchronization signal serves to indicate growing power consumption during the transmit burst. The signal is generated by the SYNC pin. Please note that this pin can adopt three different operating modes which you can select by using the AT^SSYNC command: the mode AT^SSYNC=0 described below, and the two LED modes AT^SSYNC=1 or AT^SSYNC=2 described in [1] and Section 3.17.2.
AC75 Hardware Interface Description Strictly confidential / Preliminary 3.17.2 s 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.
s 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). Although not mandatory for use in a host application, it is strongly suggested that you connect the RING0 line to an interrupt line of your application.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 4 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. The external antenna must be matched properly to achieve best performance regarding radiated power, DC-power consumption, modulation accuracy and harmonic suppression.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 4.1 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]. To properly detect the antenna and verify its connection status the antenna feed point must have a DC resistance RANT of 9kΩ (±3kΩ).
AC75 Hardware Interface Description Strictly confidential / Preliminary 4.2 s 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 plating Outer contact Brass 0.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Figure 39: Datasheet of Rosenberger SMP MIL-Std 348-A connector AC75_HD_V00.202 Page 81 of 120 27.04.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5 Electrical, Reliability and Radio Characteristics 5.1 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 Min Max Unit Supply voltage BATT+ -0.3 5.5 V Voltage at digital pins in POWER DOWN mode -0.3 0.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5.3 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. Table 24: Storage conditions Type Air temperature: Humidity relative: Air pressure: Condition Unit Reference Low -40 °C ETS 300 019-2-1: T1.
AC75 Hardware Interface Description Strictly confidential / Preliminary 5.4 s 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.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5.5 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.
AC75 Hardware Interface Description Strictly confidential / Preliminary s 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 Signal name Power supply BATT+ IO I Signal form and level Comment VImax = 4.5V VItyp = 3.8V VImin = 3.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Function Signal name IO Signal form and level Comment Power indicator PWR_IND O VIHmax = 10V VOLmax = 0.4V at Imax = 2mA PWR_IND (Power Indicator) notifies the module’s on/off state. PWR_IND is an open collector that needs to be connected to an external pullup resistor. Low state of the open collector indicates that the module is on. Vice versa, high level notifies the Powerdown mode.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Function Signal name IO Signal form and level Comment Synchronization SYNC O VOLmax = 0.3V at I = 0.1mA VOHmin = 2.3V at I = -0.1mA VOHmax = 3.05V There are two alternative options for using the SYNC pin: a) Indicating increased current consumption during uplink transmission burst. Note that the timing of the signal is different during handover. b) Driving a status LED to indicate different operating modes of AC75.
AC75 Hardware Interface Description Strictly confidential / Preliminary Function Signal name Signal form and level Comment I RI ≈ 100kΩ VILmax = 0.6V at I = -25µA VIHmin = 2.1V at I = -10µA VOmax = 3.05V CCIN = Low, SIM card holder closed CCRST O RO ≈ 47Ω VOLmax = 0.25V at I = +1mA VOHmin = 2.5V at I = -0.5mA VOHmax = 2.95V CCIO I/O RI ≈ 4.7kΩ VILmax = 0.75V VILmin = -0.3V VIHmin = 2.1V VIHmax = CCVCCmin + 0.3V = 3.
AC75 Hardware Interface Description Strictly confidential / Preliminary Function Signal name IO I2C interface I2CDAT_SPIDO I/O VOLmax = 0.2V at I = 2mA VILmax = 0.8V VIHmin = 2.15V Signal form and level VIHmax = VEXTmin + 0.3V = 3.05V SPI Serial Peripheral Interface USB s Comment I2CDAT is configured as Open Drain and needs a pullup resistor in the host application. According to the I2C Bus Specification Version 2.1 for the fast mode a rise time of max. 300ns is permitted.
AC75 Hardware Interface Description Strictly confidential / Preliminary Function Signal name IO GPIO8 I/O GPIO9 I/O GPIO10 I/O Signal form and level Pulse counter: pulse |________|~~~~~~~~~~~~~|________|~~~ | ≥ 450µs | ≥ 450µs | ~ s Comment Alternatively, the GPIO10 pin can be configured as a pulse counter for pulse rates from 0 to 1000 pulses per second. Slew rate ≤ 1µs Pulse rate: max. 1000 pulses per second Digital Audio interface Analog Audio interface VOLmax = 0.2V at I = 2mA VOHmin = 2.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5.6 Power Supply Ratings Table 27: Power supply ratings Parameter Description Conditions Min BATT+ Directly measured at reference point TP BATT+ and TP GND, see chapter 3.2.2 3.3 Supply voltage Typ 3.8 Max Unit 4.5 V 400 mV @ f<200kHz 50 mV @ f>200kHz 2 mV Voltage must stay within the min/max values, including voltage drop, ripple, spikes.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Table 28: Current consumption during Tx burst for GSM 850MHz and GSM 900MHz Mode GSM call GPRS Class 8 GPRS Class10 GPRS Class 12 EGPRS Class 8 EGPRS Class 10 Timeslot configuration 1Tx / 1Rx 1Tx / 4Rx 2Tx / 3Rx 4Tx / 1Rx 1Tx / 4Rx 2Tx / 3Rx RF power nominal 2W (33dBm) 2W (33dBm) 2W (33dBm) 1W (30dBm) 1W (30dBm) 0.5W (27dBm) 0.5W (27dBm) 0.5W (27dBm) 0.25W (24dBm) = 1 ...
s AC75 Hardware Interface Description Strictly confidential / Preliminary Table 29: Current consumption during Tx burst for GSM 1800MHz and GSM 1900MHz Mode Timeslot configuration RF power nominal GSM call GPRS Class 8 GPRS Class10 GPRS Class 12 1Tx / 1Rx 1Tx / 4Rx 2Tx / 3Rx 1W (30dBm) 1W (30dBm) 1W (30dBm) 0.5W (27dBm) 0.5W (27dBm) = 1 ... 3 = 1 = 2 or 3 1.3A 1.3A 1.1A Radio output power = 1 ...
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5.7 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. Table 30: Audio parameters adjustable by AT command Parameter Influence to Range Gain range Calculation inBbcGain MICP/MICN analogue amplifier gain of baseband controller before ADC 0...
s 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.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5.7.3 Characteristics of Audio Modes The electrical characteristics of the voiceband part depend on the current audio mode set with the AT^SNFS command. All values are noted for default gains e.g. all parameters of AT^SNFI and AT^SNFO are left unchanged. Table 31: Voiceband characteristics (typical) Audio mode no.
s 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.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Parameter Min Typ Max Unit -34 dB Test condition / remark Frequency Response 14 0Hz - 100Hz 200Hz 300Hz - 3350Hz 3400Hz 4000Hz ≥4400Hz -1.1 0.1 -0.2 -0.7 -39 -75 gs = gain setting 5.7.5 Voiceband Transmit Path Test conditions: • The values specified below were tested to 1kHz and default settings of audio modes, unless otherwise stated.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5.8 Air Interface Test conditions: All measurements have been performed at Tamb= 25°C, VBATT+ nom = 4.0V. The reference points used on AC75 are the BATT+ and GND contacts (test points are shown in Figure 4).
s AC75 Hardware Interface Description Strictly confidential / Preliminary 5.9 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 AC75 module.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 6 Mechanics 6.1 Mechanical Dimensions of AC75 Figure 42 shows the top view of AC75 and provides an overview of the board's mechanical dimensions. For further details see Figure 43. Length: Width: Height: 55.00mm 33.90mm 3.15mm Pin 1 Pin 80 Figure 42: AC75 – top view AC75_HD_V00.202 Page 103 of 120 27.04.
s 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.
AC75 Hardware Interface Description Strictly confidential / Preliminary 6.2 s Mounting AC75 to the Application Platform There are many ways to properly install AC75 in the host device. An efficient approach is to mount the AC75 PCB to a frame, plate, rack or chassis. Fasteners can be M2 screws plus suitable washers, circuit board spacers, or customized screws, clamps, or brackets. In addition, the board-to-board connection can also be utilized to achieve better support.
AC75 Hardware Interface Description Strictly confidential / Preliminary 6.3 s 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, see Figure 44 for details. Supplier: Molex www.molex.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Figure 44: Molex board-to-board connector 52991-0808 on AC75 AC75_HD_V00.202 Page 107 of 120 27.04.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Figure 45: Mating board-to-board connector 53748-0808 on application AC75_HD_V00.202 Page 108 of 120 27.04.
AC75 Hardware Interface Description Strictly confidential / Preliminary 7 s Sample Application Figure 46 shows a typical example of how to integrate a AC75 module with a Java application. Usage of the various host interfaces depends on the desired features of the application. Audio interface 1 demonstrates the balanced connection of microphone and earpiece. This solution is particularly well suited for internal transducers.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 46: AC75 sample application for Java AC75_HD_V00.202 Page 110 of 120 27.04.
s AC75 Hardware Interface Description Strictly confidential / Preliminary 8 Reference Approval 8.1 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 • SIM card reader integrated on DSB75 • U.FL-R-SMT antenna connector and U.FL-LP antenna cable • Handset type Votronic HH-SI-30.3/V1.
AC75 Hardware Interface Description Strictly confidential / Preliminary 8.2 s Compliance with FCC Rules and Regulations The FCC Equipment Authorization Certification for the AC75 reference application described in Section 8.1 shall be listed under the 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).
s AC75 Hardware Interface Description Strictly confidential / Preliminary 9 Appendix 9.1 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 DSB75 Support Box Siemens Siemens ordering number: L36880-N8811-A100 Votronic Handset VOTRONIC Votronic HH-SI-30.3/V1.
AC75 Hardware Interface Description Strictly confidential / Preliminary s Table 38: Molex sales contacts (subject to change) Molex For further information please click: http://www.molex.com/ Molex Deutschland GmbH Felix-Wankel-Str. 11 4078 Heilbronn-Biberach Germany Phone: +49-7066-9555 0 Fax: +49-7066-9555 29 Email: mxgermany@molex.com American Headquarters Lisle, Illinois 60532 U.S.A. Phone: +1-800-78MOLEX Fax: +1-630-969-1352 Molex China Distributors Beijing, Room 1319, Tower B, COFCO Plaza No.
AC75 Hardware Interface Description Strictly confidential / Preliminary 9.2 s 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.
s 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 Threaded Stud M2.5 - M2 Type E / External thread at both ends Length 3.0mm Material Stainless steel X12CrMoS17 Thread 1 / Length M2.5 / 6.
s 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 M2 Head diameter D = 3.8mm Head height 1.30mm Type Slotted cheese head screw *) 2 screws are delivered with DSB75 Support Board Article number: 01.14.141 Screw M2 DIN 84 - ISO 1207 Length 10.0mm Material Steel 4.8 Surface Zinced A2K Thread M2 Head diameter D = 3.8mm Head height 1.
s 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 M2 Wrench size / Ø 4 Thickness / L 1.6mm Type Nut DIN/UNC, DIN934 *) 9.3 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. Click here for sales contacts and further information: http://www.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 48: Lithium Ion battery from VARTA AC75_HD_V00.202 Page 119 of 120 27.04.
s AC75 Hardware Interface Description Strictly confidential / Preliminary Figure 49: VARTA PoLiFlex® Lithium Polymer battery AC75_HD_V00.202 Page 120 of 120 27.04.
