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Summary of Contents for Altec AL7020S Series Designer’s guide
- Page 1 AL7020S, AL7024S Designer’s Guide GSM Socket Modem AL7020S, AL7020S-3V Series AL7024S, AL7024S-3V Series Designer’s Guide RELEASED 9. JANUARY 2006 Doc. No. DG_7024E Altec Electronic AG Seite 1 / 32...
- Page 2 No license is granted by implication or otherwise under any patent rights of Altec other than for circuitry embodied in Altec products. Altec Electronic reserves the right to change circuitry at any time without notice.
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Page 3: Table Of Contents
Regulatory Requirements ...................30 7.1.2 Regulatory Statement ..................30 Safety Precautions .....................31 7.2.1 User Operation ....................31 7.2.2 Antenna Installation ....................31 7.2.3 Antenna care and replacement................31 7.2.4 Electronic devices....................31 APPENDIX A ......................32 REFERENCE DOCUMENTS .................32 Doc. No. DG_7024E Altec Electronic AG Seite 3 / 32... - Page 4 Table 3.8. Headset Speaker Output at Maximum Volume Level ...........21 2-1. I ...................7 IGURE NTERFACE LOCK IAGRAM 3-1. S .......................9 IGURE ERIAL INOUT 3-5. SIM C ....................17 IGURE EADER 6-2. M ..................29 IGURE ECHANICAL DRAWINGS Doc. No. DG_7024E Altec Electronic AG Seite 4 / 32...
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Page 5: Introduction
1800/1900 MHz • 5 VDC Power Summary Altec’s AL7020S, AL7024S Socket Modem provides the OEM with a complete E-GSM/GPRS 900/1800Mhz or GSM 850/1900Mhz dual-band module in a compact socket-mountable module. The compact size and high level of integration of the Socket Modem minimizes real estate and cost for motherboard and box modem applications. -
Page 6: Product Specifications
• Class B GSM 07.10 Antennas multiplexing protocol RF Cables • Coding scheme CS1-CS4 CSD: Max BR 14.4 Kbps • MO/MT Text and PDU SMS: modes • Cell broadcast FAX Class 1 Doc. No. DG_7024E Altec Electronic AG Seite 6 / 32... -
Page 7: Technical Overview
• The Speaker is connected via one pin to the module. • The Indicators are connected via two pins to the module. • The power supply is connected via one pin to the module. Doc. No. DG_7024E Altec Electronic AG Seite 7 / 32... -
Page 8: Hardware Interface
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 listed in Table 3-5. Doc. No. DG_7024E Altec Electronic AG Seite 8 / 32... -
Page 9: Table 3-1. Serial Ttl Signals
LED GPRS Output No pin SIMVCC (option) Output No pin LED GSM Output POWER +5V SIMDATA (option) Bi-directional MICV Input SIMRST (option) Output AGND GND Analog SIMCLK (option) Output SPKR Output Doc. No. DG_7024E Altec Electronic AG Seite 9 / 32... -
Page 10: Table 3-2. Signal Descriptions
SIM Data line. Digital, bi-directional data line to exchange data between SIMDATA module and SIM card. SIM Power Supply. 3VDC Power Supply provided from module to power SIMVCC the SIM Card. Only 3V SIM Cards are supported. Doc. No. DG_7024E Altec Electronic AG Seite 10 / 32... -
Page 11: Table 3-3. Signal Descriptions (Cont'd)
DTE (manual answering) or internally (automatic answering). ~DTR OFF places the modem in the disconnect state under control of the &Dn command. The effect of ~DTR ON and ~DTR OFF depends on the &Dn command. Doc. No. DG_7024E Altec Electronic AG Seite 11 / 32... -
Page 12: Table 3-4. Analog Electrical Characteristics
Power: 10mW the speaker: Sound Pressure.: 110dB MICV I(DA) Recommended characteristics for Bias Voltage: 2.2V ( 0.5mA ) the microphone: Impedance: 2 KOhms Sensitivity: –40 to –50dB SNR: > 50dB Doc. No. DG_7024E Altec Electronic AG Seite 12 / 32... -
Page 13: Table 3-5. Digital Electrical Characteristics
SIMVCC 2.70 2.80 2.85 Output Voltage Loaded with SIMCLK Rise / Fall Time 30pF SIMRST Loaded with SIMDATA µs 30pF Rise / Fall Time Loaded with SIMCLK 3.25 Frequency 30pF Doc. No. DG_7024E Altec Electronic AG Seite 13 / 32... -
Page 14: Table 3-6. Absolute Maximum Ratings
Average Idle @ 3.3V Supply Current GSM 1800 Average @PCL5 @ 3.3V Average @PCL10 @ 3.3V Average Idle @ 3.3V Notes: Test Conditions: VCC = 5VDC +/- 5%, TA = 25°C, Doc. No. DG_7024E Altec Electronic AG Seite 14 / 32... -
Page 15: Antenna Interface (Rf)
For the antenna-cable RG178 is recommended. RF Connector AL7020S Connector Mating Connector Standard MMCX female Amphenol: Standard MMCX male MMCX 6251S5-3GT30G-50 (connector for cable) gold plated 3-4. Antenna Connector Interface IGURE Doc. No. DG_7024E Altec Electronic AG Seite 15 / 32... -
Page 16: Antenna Performance Recommendations
FCC RF exposure requirements for mobile transmitting devices. IMPORTANT: To comply with the FCC RF exposure limits and satisfy the categorical exclusion requirements for mobile transmitters, the following requirements must be met: Doc. No. DG_7024E Altec Electronic AG Seite 16 / 32... -
Page 17: Internal Sim Card Interface
SIM Power Supply SIMRST SIM Reset SIMCLK SIM Clock SIMGND SIM GND SIMDATA SIM Data SIM Card Detect not SIMPRES supported SIM Card Reader Bottom View Figure 3-5. SIM C EADER Doc. No. DG_7024E Altec Electronic AG Seite 17 / 32... -
Page 18: Sim Card Mechanical Drawings
AL7020S, AL7024S Designer’s Guide SIM Card Mechanical Drawings Doc. No. DG_7024E Altec Electronic AG Seite 18 / 32... -
Page 19: External Sim Card Interface (-Es Option)
SIM Power Supply 3.7.2 SIM socket pin description: Signal Pin Number Description SIMVCC SIMRST SIMCLK VCC module (Not connected) GROUND Not connected SIMDATA SIMPRES (Not connected) TOP VIEW SIMVCC SIMRST SIMDATA SIMCLK Doc. No. DG_7024E Altec Electronic AG Seite 19 / 32... -
Page 20: Sim Card Reader Integration
For the SIM interface, length of the tracks between the GSM modem and the SIM connector should be as short as possible (8cm). EMI layout is recommended for SIMCLK signal. SIMCLK Socket Modem connector SIMRST SIMVCC SIMDATA Less than 8 cm Doc. No. DG_7024E Altec Electronic AG Seite 20 / 32... -
Page 21: Audio - Interface
Table 3.8. Headset Speaker Output at Maximum Volume Level dBm0 mV RMS Headset dBm0 mV RMS Speaker (mV RMS) 3.14 1111.9 774.6 435.6 244.9 -15.5 122.8 109.4 77.5 43.6 24.5 3000 Speak Doc. No. DG_7024E Altec Electronic AG Seite 21 / 32... -
Page 22: Microphone Circuit
If possible, the RF cable ground from the AL7020S should be connected to the GND of the Module. • The digital lines of the application should never be referenced to the MIC GND(63). Doc. No. DG_7024E Altec Electronic AG Seite 22 / 32... -
Page 23: Reset Signal (On/Off Signal)
• T2 minimum = 10 seconds. • T3 minimum = 2 seconds. 3.9.1 Software Reset It is possible to reset the module by software, which activates an internal reset generator (see AT Commands Reference Manual). Doc. No. DG_7024E Altec Electronic AG Seite 23 / 32... -
Page 24: Connectors And Peripheral Reference
GSM antennas and support for antenna adaptation can be obtained from manufacturers such • ALLGON (http://www.allgon.com • MOTECO (http://www.moteco.com • AMPHENOL (http://www.amphenol.com • GALTRONICS (http://www.galtronics.com • RADIALL / LARSEN (http://www.larsenantennas.com/) • RANGESTAR (http://www.rangestar.com/) Doc. No. DG_7024E Altec Electronic AG Seite 24 / 32... -
Page 25: Design Guidelines
5. Locate high frequency circuits in a separate area to minimize capacitive coupling to other circuits. Distribute high frequency signals continuously on a single trace rather than several traces radiating from one point. Doc. No. DG_7024E Altec Electronic AG Seite 25 / 32... -
Page 26: Grounding
The module draws up to 1.3A max. for 577µs every 4,6ms at GSM transmit level PCL5 (2W). Therefore a regulator with fast transient response and good load regulation is strongly recommended. Peak 1.3 A Current Measurement @ PCL 5 Doc. No. DG_7024E Altec Electronic AG Seite 26 / 32... -
Page 27: Power Supply 3.3V (3V Models)
The following regulators where tested and found to be good. - MIC29150 Micrel Inc. www.micrel.com - LP3852 / LP3855 National Semiconductor www.national.com - LM3940 National Semiconductor www.national.com - LTC1778 Linear Technology www.linear.com Doc. No. DG_7024E Altec Electronic AG Seite 27 / 32... -
Page 28: Rf Antenna
Moreover, the power emitted through the antenna could affect the application. Warning: Altec Electronic strongly recommends to work with an antenna manufacturer either to develop an antenna adapted to the application or to adapt an existing solution to the application. The antenna adaptation (mechanical and electrical adaptation) is one of the key issues in the design of a GSM terminal. -
Page 29: Module Dimensions
AL7020S, AL7024S Designer’s Guide Top View 7.0 mm Top View Pin 1 6-2. M IGURE ECHANICAL DRAWINGS Dimensions in Millimeters Doc. No. DG_7024E Altec Electronic AG Seite 29 / 32... -
Page 30: Regulatory Approvals
Failure to comply with these precautions violates safety standards of design, manufacture and intended use of the product. Altec assumes no liability for customer failure to comply with these precautions. 1. The AL7020S must be operated at the voltages described in the technical documentation. -
Page 31: Safety Precautions
RF emission regulations or invalidate type approval. 7.2.4 Electronic devices Most electronic equipment, for example in hospitals and motor vehicles is shielded from RF energy. However RF energy may affect some improperly shielded electronic equipment. Doc. No. DG_7024E Altec Electronic AG Seite 31 / 32... -
Page 32: Reference Documents
04.11, GSM1800 ph2 Miscellaneous 06.10, 06.11, 06.12, 06.31, 06.32, 07.01, 09.07 GT 01 v4.2.1 EN 300 919 V7.1.0 (1999-07) European standard GSM1900 ph2+ (Telecommunications series) Digital cellular telecommunications system (phase2+) Doc. No. DG_7024E Altec Electronic AG Seite 32 / 32...
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