Assessments - 3, GPA: 3.3
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Antenna Connector Interface Doc. No. DG_7024E Altec Electronic AG Seite 15 / 32 AL7020S, AL7024S Designer’s Guide 3.4.2 Antenna Performance Recommendations Table 3.7 -Antenna Performance Recommendations Frequencies: GSM 850 TX 824 – 849 MHz RX 869 – 893 MHz GSM 900 TX 880 – 915 MHz RX 925 – 960 MHz DCS 1800 TX 1710 – 1785 MHz RX 1805 – 1880 MHz PCS 1900 TX 1850 - 1910 MHz RX 1930 – 1990 MHz Gain: 0 dBi (unity) gain or greater Impedance: 50 Ohm VSWR: Typical: 1.5:1 Worst case: 2.5:1 3.4.3 Antenna Installation • A minimum separation distance of 20 cm needs to be maintained between the antenna and all persons. • The transmitter effective radiated power must be less than 3.0 Watts ERP (4.9 Watts or 36.9 dBm EIRP). This requires that the combination of antenna gain and feed line loss does not exceed 16 dBi. 3.4.4 User Operation Do not operate your unit when a person is within 8 inches (20 centimeters) of the antenna. A person or object within 8 inches (20 centimeters) of the antenna could impair call quality and may cause the phone to operate at a higher power level than necessary. IMPORTANT: The unit must be installed in a manner that provides a minimum separation distance of 20 cm or more between the antenna and persons to satisfy 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 AL7020S, AL7024S Designer’s Guide 3.5 Internal SIM Card Interface The AL7020S module has a built-in SIM card reader within the module itself (see figure 3.5). The SIM card is inserted into the slot provided on the side of the connectors (bottom side). The SIM Interface controls a 3V SIM card. This interface is fully compliant with GSM 11.11 recommendation concerning SIM functions. 3.5.1 SIM Card reader pins supported: Description SIMVCC 1 O SIM Power Supply SIMRST 2 O SIM Reset SIMCLK 3 O SIM Clock SIMGND 5 O SIM GND SIMDATA 7 I/O SIM Data SIMPRES 8 I SIM Card Detect not supported SIM Card Reader Bottom View Figure 3-5. SIM CARD READER Doc. No. DG_7024E Altec Electronic AG Seite 17 / 32 AL7020S, AL7024S Designer’s Guide 3.6 SIM Card Mechanical Drawings Doc. No. DG_7024E Altec Electronic AG Seite 18 / 32 AL7020S, AL7024S Designer’s Guide 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 diodes with low capacitance (less than 10pF) have to be connected on SIMCLK and SIMDATA to avoid any disturbance of the rising and falling edge. These types of diodes are mandatory for the Full Type Approval. They shall be placed as close as possible to the SIM socket. 3.7.1 External SIM Card reader pins supported: Description SIMCLK 32 O 2X SIM Clock SIMRST 31 O 2X SIM Reset SIMDATA 30 I/O CMOS / 3X SIM DATA SIMVCC 28 O SIM Power Supply 3.7.2 SIM socket pin description: Description VCC 1 SIMVCC RST 2 SIMRST CLK 3 SIMCLK CC4 4 VCC module (Not connected) GND 5 GROUND VPP 6 Not connected I/O 7 SIMDATA CC8 8 SIMPRES (Not connected) 5 GND 6 7 SIMDATA 8 TOP VIEW 1 SIMVCC 2 SIMRST 3 SIMCLK 4 Doc. No. DG_7024E Altec Electronic AG Seite 19 / 32 AL7020S, AL7024S Designer’s Guide 3.7.3 SIM Card Reader Integration: SIM interface controls a 3V SIM only. We add Transient Voltage Suppressor (TVS) diodes with low capacitance (less than 10pF) on signal connected to the SIM socket in order to prevent any Electrostatic Discharge. They shall be placed as close as possible to the SIM socket. Following references are used: DALC208SC6 from ST Microelectronics, which will be connected, to SIMCLK and SIMDATA. ESDA6V1 from ST Microelectronics for the ESD protection of SIMVCC. On the board near SIM connector, we also add on SIMVCC a 100nF capacitor in parallel as close as possible to the SIM connector to minimize noise. Schematic of SIM Interface: P1A SIMCLK SIMVCC D1 ESDA6V1L 12 3 P1 SIM-CARD-READER 1 2 3 5 6 7 4 8 VCC RST CLK GND VPP I/O PRES_IN PRES_OUT D2 DALC208SC6 12 456 3 SIMDATA SOCKET MODEM 32 31 30 29 28 27 26 25 24 C1 100NF RESET SIMRST 3.7.4 Layout Restrictions: 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. GND SIMCLK GND Socket SIM Modem connector SIMRST SIMVCC SIMDATA GND Less than 8 cm Doc. No. DG_7024E Altec Electronic AG Seite 20 / 32 AL7020S, AL7024S Designer’s Guide 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 Voi...
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