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28, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 28 / 32 5.1.5 RF Antenna Antenna sub-system and integration in the application is a major issue. Attention should be paid to : • Choice of the antenna cable (type, length, performance, thermal resistance, etc) • Antenna connector (type + losses). These elements could affect GSM performances such as sensitivity and emitted power • The antenna should be isola…
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19, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 19 / 32 3.7 External SIM Card Interface (-ES Option) 4 signals exist: • SIMVCC: SIM power supply. • SIMRST: reset. • SIMCLK: clock. • SIMDATA : I/O port. The SIM interface controls a 3V SIM. This interface is fully compliant with GSM 11.11 recommendations concerning SIM functions. It is recommended to add Transient Voltage Suppressor diodes on the signal connected to the SIM socket in order to prevent any Electrostatic Discharge. TVS diod…
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30, Altec AL7020S-3V Series Designer’s guide AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 30 / 32 7 7 . . R R E E G G U U L L A A T T O O R R Y Y A A P P P P R R O O V V A A L L S S The GSM Socket Modem is approved as a host-independent modem module. To maintain type approvals, permits and/or licenses valid, the guidelines described in this document must be followed. 7.1 Considerations for Regulatory Approvals The AL7020S Socket Modem has been assessed and has been found to comply with the followi…
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25, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 25 / 32 5 5 . . D D E E S S I I G G N N G G U U I I D D E E L L I I N N E E S S Good engineering practices must be adhered to when designing a printed circuit board (PCB) containing the GSM Socket Modem module. Suppression of noise is essential to the proper operation and performance of the modem itself and for surrounding equipment. Two aspec…
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27, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 27 / 32 5.1.3 Power Supply 3.3V (3V Models) A power supply with 3.3V +/- 5% (3V models) and a minimum power of 1A is strictly required to supply this module. The supply-regulator should be placed as close to the module as possible (about 5cm or nearer). To keep a short and low impedance connection between the regulator and the module is very important when supplying the module with 3.3V. The 3.3V-trace between regulator and module should be at least 2.5mm wide…
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29, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 29 / 32 6 6 . . M M O O D D U U L L E E D D I I M M E E N N S S I I O O N N S S F IGURE 6-2. MECHANICAL DRAWINGS 7.0 mm Top View Pin 1 2.0 Top View Dimensions in Millimeters
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18, Altec AL7020S-3V Series Designer’s guide AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 18 / 32 3.6 SIM Card Mechanical Drawings
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1, AL7020S Designer’s Guide Doc. No. DG_7020C Altec Electronic AG Seite 1 / 32 GSM Socket Modem AL7020S, AL7020S-3V Series Designer’s Guide RELEASED 17. JANUARY 2005
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4, AL7020S Designer’s Guide Doc. No. DG_7020C Altec Electronic AG Seite 4 / 32 List of Tables & Figures Table 3-1. Serial TTL Signals...................................................................................................9 Table 3-2. Signal Descriptions ...............................................................................................10 Table 3-3. Signal Descriptions (Cont'd)......…
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21, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 21 / 32 3.8 Audio - Interface 3.8.1 Speaker-Circuit Audio output is useful for monitoring the modem's call-progress tones and modem system debugging, as well as for fullfeatured Voice applications. You can directly connect a speaker of 32 to 150 Ohms to pins 63 and 64. The connection is single- ended, with analog-ground at pin 63. Use good shielding of the audio-connecti…
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11, Altec AL7020S-3V Series Designer’s guide AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 11 / 32 Table 3-3. Signal Descriptions (Cont'd) Label I/O Type Signal Name/Description The Serial interface signals are TTL-level signals. ~RTSTTL IB Request To Send (TTL Active Low). ~RTS is used to condition the local modem for data transmission and, during half-duplex operation, to control the direction of data transmission. O…
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3, AL7020S Designer’s Guide Doc. No. DG_7020C Altec Electronic AG Seite 3 / 32 Table of Contents 1. INTRODUCTION ..........................................................................................................5 1.1 Models Description .......................................................................................................5 1.2 Summary ...........................................................................................................…
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13, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 13 / 32 Table 3-5. Digital Electrical Characteristics Parameter Symbol Min. Typ. Max. Units Test Conditions Input High Voltage pins 33,35,40 V IH 2 - 5.5 Vdc Input Low Voltage pins 33,35,40 V IL 0 - 0.8 Vdc Output High Voltage pins 34,36,37,38 V OH VCC-0.1V 3.8V @VCC=4.5V VCC 4.2 - - Vdc ILOAD= -20 uA ILOAD = -4 mA …
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15, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 15 / 32 3.4 Antenna Interface (RF) The AL7020S has two models, one for North America Frequency bands (850/1900 MHz), and one for European Bands (900/1800 MHz). The following connection requirements apply for the AL7020S antenna: • The AL7020S is terminated with an MMCX connector, and with 50-ohm impedance in the relevant frequencies. • …
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9, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 9 / 32 Figure 3-1. SERIAL PINOUT Table 3-1. Serial TTL Signals PI N NAME I/O TYPE PIN NAME I/O TYPE 1 NC NC 33 ~RTSTTL Input 2 NC NC 34 ~RXDTTL Output 3 No pin 35 ~TXDTTL Input 4 No pin 36 ~RITTL Output 5 No pin 37 ~DSRTTL Output 6 No pin 38 ~CTSTTL Output 7 No pin 39 ~DCDTTL Output 8 No pin 40 ~DTRTTL Input 9 …
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22, Altec AL7020S-3V Series Designer’s guide AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 22 / 32 3.8.2 Microphone circuit The AL7020S has an analog input, referenced to the microphone ground (pin 63). The AL7020S contains an analog amplifier with a default gain of 22dB, which can be adjusted in seven steps between 0 and 31dB using the AT+MMICG command. For more details about this command, refer to the AT Commands document (AT_7020A). When the default gain of 22dB is used, then the level consideratio…
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8, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 8 / 32 3 3 . . H H A A R R D D W W A A R R E E I I N N T T E E R R F F A A C C E E 3.1 Interface Signals The Socket Modem pin assignments with DTE serial TTL interface, SIM Card and Analog Interface are shown in Figure 3-1 and are listed in Table 3-1. 3.2 Signal Description The Socket Modem interface signals are described in Table 3-3. The digital electrical characteristics are listed in Table 3-4. The analog electrical characteristics are li…
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23, Altec AL7020S-3V Series Designer’s guide AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 23 / 32 3.9 Reset Signal (ON/OFF Signal) After power is applied to the AL7020S module, the power-on process is initiated, which lasts about five seconds, after which the module is ready to communicate. After power-on, the on/off signal is pulled high to the VCC by a 200k resistor. The module remains active until power is turned off or the power-off process is initiated by activating the Reset (ON/OFF) signal. The AT i…
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26, Altec AL7020S-3V Series Designer’s guide AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 26 / 32 6. Locate cables and connectors so as to avoid coupling from high frequency circuits. 7. If a mulilayer board design is used, make no cuts in the ground or power planes and be sure the ground plane covers all traces. 8. Minimize the number of through-hole connections on traces carrying high frequency signals. 9. Avoid right angle turns on high frequency traces. Forty-five degree corners are good, however, radius…
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7, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 7 / 32 2 2 . . T T E E C C H H N N I I C C A A L L O O V V E E R R V V I I E E W W 2.1 Block Diagramm of GSM Module 2.2 Supported Interfaces The major hardware signal interfaces of the DF Series SocketGSM Modem are illustrated in Figure 1-1. Figure 2-1. Interface Block Diagram …
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14, Altec AL7020S-3V Series Designer’s guide AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 14 / 32 Table 3-6. Absolute Maximum Ratings Parameter Symbol Min. Typ. Max. Units Test Condition Supply Voltage V DD -0.3 - +6.0 Vdc Input Voltage V IN -0.5 - +7.0 Vdc Nominal Supply Voltage 5V Version 3V Version V DD 4.75 3.20 - - 5.25 3.45 …
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5, AL7020S Designer’s Guide Doc. No. DG_7020C Altec Electronic AG Seite 5 / 32 1 1 . . I I N N T T R R O O D D U U C C T T I I O O N N 1.1 Models Description Models Operating Bands Interface Connectors Interfaces / Power AL7020S GSM 900/1800 MHz • DIL-64 Header (RM2) • MMCX RF Connector • RS232 TTL Level • 5 VDC Power AL7020S-3V GSM 900/1800 MHz • DIL-64 Header (RM2) • MMCX RF Connector • RS232 TTL Level • 3.3 VDC Power AL7020S-ES GSM 900/1800 MHz • DIL-64 Header (RM2) • MMCX R…
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16, Altec AL7020S-3V Series Designer’s guide AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 16 / 32 3.4.2 Antenna Performance Recommendations Table 3.7 - Antenna Performance Recommendations Frequencies: TX 824 – 849 MHz GSM 850 RX 869 – 893 MHz TX 880 – 915 MHz GSM 900 RX 925 – 960 MHz TX 1710 – 1785 MHz DCS 1800 RX 1805 – 1880 MHz TX 1850 - 1910 MHz PCS 1900 RX 1930 – 1990 MHz Gain: 0 dBi (unity) gain or greater Impedance: 50 Ohm VSWR: Ty…
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6, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 6 / 32 1.3 Product Specifications Product Features Operating systems: EGSM: 900/1800 MHz GSM: 850/1900 MHz Physical Characteristics Size: 64.5 x 26.5 mm Socket Modem Form Faktor Mounting: Through DIL-64 connectors Weight: Environmental Operational temp. -20°C +60° C Functional temp. -20°C +70° C Storage temp. -40°C +85°C Performance Operating Voltage: 3.3V / 5V Current consumption : …
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10, AL7020S Designer’s Guide Doc. No. DG_7020B Altec Electronic AG Seite 10 / 32 Table 3-2. Signal Descriptions Label I/O Type Signal Name/Description VCC PWR +5 VDC. A standard 5V +/- 5% - 1.5A power supply is strictly required to supply this module (5V Versions). Average current is 270mA (350mA @ PCL5). See also chapter 5.1.2 +3.-3 VDC. A standard 3.3V +/- 5% - 1A power supply is strictly required to supply this module (…
