Telit Wireless Solutions SL869 Hardware User's Manual
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Telit Wireless Solutions SL869 Hardware User's Manual

Telit Wireless Solutions SL869 Hardware User's Manual

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SL869 Hardware User Guide
1vv0301001 Rev.2 – 2013-12-17

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Summary of Contents for Telit Wireless Solutions SL869

  • Page 1 SL869 Hardware User Guide 1vv0301001 Rev.2 – 2013-12-17...
  • Page 2 SL869 Hardware User Guide 2013-12- 1vv0301001 Rev.2 – APPLICABILITY TABLE PRODUCT SL869 Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 2 of 28 Mod. Rev...
  • Page 3 SL869 Hardware User Guide 2013-12- 1vv0301001 Rev.2 – SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE Notice While reasonable efforts have been made to assure the accuracy of this document, Telit assumes no liability resulting from any inaccuracies or omissions in this document, or from use of the information obtained herein.
  • Page 4 SL869 Hardware User Guide 2013-12- 1vv0301001 Rev.2 – Usage and Disclosure Restrictions License Agreements The software described in this document is the property of Telit and its licensors. It is furnished by express license agreement only and may be used only in accordance with the terms of such an agreement.

  • Page 5: Table Of Contents

      1.5.   Text Conventions ...................... 8   1.6. Related Documents ....................8       Powering the SL869 ....................9   2.1. 3.3V Supply Voltage ....................9     2.2.   Battery Back-up ....................... 9   Updating the Firmware ..................10  ...
  • Page 6 SL869 Hardware User Guide 2013-12- 1vv0301001 Rev.2 – 6.1.   UART Interface ....................... 19   6.1.1.  Host Serial Interface ..................... 20  6.2. UART Interface ....................... 21       Advanced Features ..................... 22   7.1. CW Jamming Detection ..................22  ...

  • Page 7: Introduction

    This document only covers the standard and timing variants of the SL869. A separate hardware user guide is provided for the DR variant of the SL869.

  • Page 8: Document Organization

    Related Documents SL869 Product Description, 80405ST10105a SL869 EVK User Guide, 1VV0301004 SL869 Software User Guide, 1VV0301002 SL869 Timing Software User Guide, 1VV0301094 Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 8 of 28 Mod. Rev...

  • Page 9: Powering The Sl869

    GPIO, it is possible for the LDO to turn on during the boot process and then be shut down. This can cause the SL869 to fail to initialize properly. If this happens, a full power cycle of both VCC_IN and VBATT would be required on the SL869.

  • Page 10: Updating The Firmware

    SL869 module executes the code out of the internal flash memory. However, if the internal flash memory needs to be updated, the following steps should be performed to place the SL869 module into a state suitable for programming the internal flash memory.

  • Page 11: Communications

    BOOT pin. Internally, this pin has a 10K pullup to VCC_IN to allow the SL869 to properly start up. This pin must not be grounded or pulled low at any time for normal operation.

  • Page 12: Rf Front End Design

    GPS/Glonass antenna. If the antenna cannot be located near the SL869, then an active antenna (that is, an antenna with a low noise amplifier built in) can be used. The following items will be discussed in turn to assist in designing the “RF front end”.

  • Page 13: Rf Signal Requirements

    The Glonass signal is defined by ICD L1 L2 Glonass Edition 5.1 2008. This document has similar power levels as compared to the GPS signal for a similar antenna. The SL869 will display a reported C/No of 40 dB-Hz for a signal level of -130 dBm into the RF input.

  • Page 14: Gps/Glonass Antenna Polarization

    SL869 Hardware User Guide 2013-12- 1vv0301001 Rev.2 – cause significant blockage, plus any thermal coating applied to the vehicle glass can attenuate the GPS/Glonass signal by as much as 15 dB. Again, both of these factors will affect the performance of the receiver.

  • Page 15: System Noise Floor

    Thermal noise is -174 dBm/Hz at around room temperature. From this we can compute a system noise figure of 4 dB for the SL869. This noise figure consists of the loss of the pre- select SAW filter, the noise figure of the LNA as well as implementation losses within the digital signal processing unit.

  • Page 16: Rf Trace Losses

    5.7. External LNA Gain and Noise Figure The SL869 can be used with an external LNA such as what might be found in an active antenna. Because of the internal LNA, the overall gain (including signal losses past the external LNA) should not exceed 35 dB. Levels higher than that can affect the jamming detection capability of the SL869.

  • Page 17: Powering The External Lna (Active Antenna)

    DC voltage that is impressed upon the RF signal line. This voltage is not supplied by the SL869, but can be easily supplied by the host design. Two approaches can be used. The first is to use an inductor to tie directly to the RF trace. This inductor should be at self-resonance at L1 (1.6 GHz) and should have good Q for low loss –...

  • Page 18: Rf Interference

    GPS and Glonass signals are at -130 dBm and lower. If signal higher than this are presented to the receiver it can be overwhelmed. The SL869 can reject a CW in-band jamming signals, but would still be affected by non-CW signals.

  • Page 19: Reference Designs

    Figure 3 – SL869 Serial UART Reference Design The CAN and I2C interfaces shown in the reference design above are not supported in the standard and timing product variants of the SL869. The USB interface is covered in the next section.

  • Page 20: Host Serial Interface

    VBATT is required to power the receiver when VCC_IN is removed. If command and control of the SL869 is desired, then the RX signal is also required to be connected. If in-circuit firmware updates are desired, then the BOOT and RX signals must be connected.

  • Page 21: Uart Interface

    USB interface. The USB supply voltage on pin 1 of J2 is fed through a LDO to drop it down to 3 volts for application to the VDD_USB pin of the SL869. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.

  • Page 22: Advanced Features

    7.3. DGPS Differential corrections can also be supplied to the SL869 using an RTCM beacon receiver. Only RTCM SC-104 messages 1 and 9 are supported. The use of DGPS corrections can improve typical position accuracy to 1.5m or less in open-sky applications.

  • Page 23: Handling And Soldering

    STD-020. This rating is assigned due to some of the components used within the SL869. The SL869 is supplied in trays or tape and reel and is hermetically sealed with desiccant and humidity indicator card. The SL869 parts must be placed and reflowed within 48 hours of first opening the hermetic seal provided the factory conditions are less than 30°C and less...

  • Page 24: Esd

    020. The reflow profile must not exceed the profile given IPC/JEDEC J-STD-020 Table 5-2, “Classification Reflow Profiles”. Although IPC/JEDEC J-STD-020 allows for three reflows, the assembly process for the SL869 uses one of those profiles. Thus the SL869 is limited to two reflows.

  • Page 25: Assembly Issues

    For boards using dual sided SMT processes, it is strongly recommended to place the SL869 on the top side of the board.

  • Page 26: Pcb Layout Details

    1vv0301001 Rev.2 – PCB Layout Details The PCB footprint on the receiving board should match the SL869 pad design shown below. The solder mask opening is generally determined by the component geometry of other parts on the board and can be followed here.

  • Page 27: Safety Recommendations

    SL869 Hardware User Guide 2013-12- 1vv0301001 Rev.2 – Safety Recommendations READ CAREFULLY Be sure the use of this product is allowed in the country and in the environment required. The use of this product may be dangerous and has to be avoided in the following areas: ...

  • Page 28: Document History

    Changes Issue #0 2012-03-12 First issue Issue #1 2012-07-25 §4.3 and §6 : Updated USB availability in SL869 variants Issue #2 2103-12-17 Additional information on usage of USB, powering the module, the using the three UART ports and timing diagram.

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