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SimCom SIM68R Hardware Design

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SIM68R_Hardware Design_V1.02

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Summary of Contents for SimCom SIM68R

  • Page 1 SIM68R_Hardware Design_V1.02...
  • Page 2 Document Control ID General Notes SIMCom offers this information as a service to its customers, to support application and engineering efforts that use the products designed by SIMCom. The information provided is based upon requirements specifically provided to SIMCom by the customers. SIMCom has not undertaken any independent search for additional relevant information, including any information that may be in the customer’s possession.

  • Page 3: Table Of Contents

    Application Interface............................16 Power Management ..........................16 4.1.1 Power Input ............................16 4.1.2 Starting SIM68R ..........................16 4.1.3 Verification of SIM68R Start ......................16 4.1.4 Power Saving Modes........................... 16 4.1.5 Operating Mode ..........................17 4.1.5.1 Full on Mode............................17 4.1.5.2 Sleep Mode ............................
  • Page 4 Smart Machine Smart Decision Electro-Static Discharge ......................... 27 Certification............................27 Manufacturing ..............................28 Top and Bottom View of SIM68R ......................28 Assembly and Soldering......................... 28 Moisture sensitivity ..........................29 ESD handling precautions ........................30 Shipment..............................30 Reference Design............................. 31 Appendix ................................32 A.
  • Page 5 TABLE 7: ABSOLUTE MAXIMUM RATINGS......................26 TABLE 8: SIM68R OPERATING CONDITIONS......................26 TABLE 9: SIM68R STANDARD IO FEATURES......................26 TABLE 10: THE ESD ENDURE STATUE MEASURED TABLE (TEMPERATURE: 25℃, HUMIDITY:45% ) ..27 TABLE 11: ILLUSTRATION OF MODULE INFORMATION ..................28 TABLE 12: MOISTURE CLASSIFICATION LEVEL AND FLOOR LIFE ..............
  • Page 6 FIGURE 4: RECOMMENDED PCB DECAL (TOP VIEW) (UNIT: MM)..............15 FIGURE 5: SIM68R PASSIVE ANTENNA DESIGN ..................... 21 FIGURE 6: SIM68R PASSIVE ANTENNA DESIGN (WITH EXTERNAL LNA AND SAW) ........21 FIGURE 7: SIM68R PASSIVE ANTENNA DESIGN FOR BEST PERFORMANCE ........... 22 FIGURE 8: SIM68R ACTIVE ANTENNA DESIGN ......................

  • Page 7: Version History

    Smart Machine Smart Decision Version History Date Version Description of change Author 2012-10-17 V1.00 Origin Shengwu.Sun Xiaohan.Jin 2013-01-22 V1.02 Add some features and Modify pictures Shengwu.Sun SIM68R_Hardware Design_V1.02 2013.01.22...

  • Page 8: Introduction

    Smart Machine Smart Decision 1 Introduction This document describes the hardware interface of the SIMCom module SIM68R，which can be used as GNSS or A-GPS（Assisted Global Positioning System） receiver. As wide range of applications, this document will describe them in great detail.

  • Page 9: Sim68R Functional Diagram

    Smart Machine Smart Decision SIM68R Functional Diagram The following figure shows a functional diagram of the SIM68R and illustrates the main functional parts: The GNSS chip SAW filter The antenna interface The communication interface The control signals Figure 1: SIM68R functional diagram...

  • Page 10: General Features

    Smart Machine Smart Decision Time To First Fix Hot start <1 Warm start Cold start A-GPS TTFF(EPO Hot start in flash mode) Warm start Cold start 12.5 Sensitivity Autonomous -148 acquisition(cold start) Re-acquisition -160 Tracking -167 Receiver Channels Update rate Tracking L1, CA Code Protocol support...
  • Page 11 Smart Machine Smart Decision Host port UART,UART1 Other port Serial port protocol (UART) NMEA; 8 bits, no parity, 1 stop bit; 115200 baud (configurable) TM output (1PPS) 1 pulse per second, synchronized at rising edge, pulse length 300ms Note 1: Operation in the temperature range –40°C~ –30°C is allowed but Time-to-First-Fix performance and tracking sensitivity may be degraded.

  • Page 12: Package Information

    Smart Machine Smart Decision 3 Package Information Pin out Diagram Figure 2: SIM68R pin out diagram (Top view) Pin Description Table 3: Pin description Pin name Pin number Description Comment Power supply Provide clean and stable Main power input, which will be used power source to this pin.
  • Page 13 Smart Machine Smart Decision Output voltage. It Has been connected V_OUT If unused, keep open. to VCC inside the Module 2.8V output power supply for active VCC_RF If unused, keep open. antenna If unused ， connect to V_ANT Antenna Bias voltage The backup battery input power supply V_BACKUP If unused, keep open.

  • Page 14: Package Dimensions

    Smart Machine Smart Decision Package Dimensions Following figure shows the Mechanical dimensions of SIM68R (top view, side view and bottom view). Figure 3: SIM68R mechanical dimensions (Unit: mm) SIM68R_Hardware Design_V1.02 2013-01-22...

  • Page 15: Sim68R Recommended Pcb Decal

    Smart Machine Smart Decision SIM68R Recommended PCB Decal Figure 4: Recommended PCB decal (top view) (Unit: mm) SIM68R_Hardware Design_V1.02 2013-01-22...

  • Page 16: Application Interface

    Backup mode: In this mode the SIM68R must be supplied by the backup and it can help to count down the time for backup mode. Software on host side to send the command through the communication interface into the backup mode.

  • Page 17: Operating Mode

    VCC_RF should be open. UART Interface SIM68R includes two UART (UART and UART1) interface for serial communication. The UART is as NMEA output and PMTK command input. The receiver (RXD) and transmitter (TXD) side of every port contains a 16-byte FIFO and has 256 bytes URAM.

  • Page 18: I 2 C Interface

    The user should update the EPO files from the EPO server daily through the internet. Then the EPO data should send to the SIM68R by the HOST side. SIM68R has the short cold TTFF and warm TTFF, when the A-GPS is used.

  • Page 19: Easy Mode

    (GAGAN) to cover the Indian subcontinent. SIM68R module supports SBAS and RTCM, but only one mode can be applied at one time, and SBAS is the default feature, customers who want to apply RTCM in the design can contact SIMCom sales for supporting GNSS Antenna The SIM68R is designed for use with passive and active antennas.

  • Page 20: Antenna Interface

    Antenna Interface 4.7.1 The SIM68R receives L1 band signals from GNSS and GALILEO satellites at a nominal frequency of 1574～ 1606 MHz. The RF signal is connected to the RF_IN pin. the trace from RF_IN to antenna should be 50Ω...

  • Page 21: Figure 5: Sim68R Passive Antenna Design

    For best performance with passive antenna designs user can use an external LNA to increase the sensitivity up 3~4 dB. Please see Figure 6 and Figure 7. Figure 6: SIM68R passive antenna design (with external LNA and SAW) SIM68R_Hardware Design_V1.02...

  • Page 22: Active Antennas

    Smart Machine Smart Decision Figure 7: SIM68R passive antenna design for best performance 4.7.2.2 Active Antennas Active antennas have an integrated Low-Noise Amplifier (LNA). They can be directly connected to RF_IN. If an active antenna is connected to RF_IN, the LNA of the antenna needs to be supplied with the correct voltage through pin V_ANT.

  • Page 23: Active Antenna Bias Power

    V_ANT to supply the antenna with a filtered supply voltage. However, the voltage specification of the antenna has to match the actual supply voltage of the SIM68R Receiver. For External supply, the supply should be virtually free of noise.

  • Page 24: Short Circuit Detection

    Smart Machine Smart Decision 4.7.3.1 Short circuit Detection If a short circuit in the active antenna pulls V_ANT to ground, then the module will detect it, and the module will report $GPTXT,01,01,02,ANTSTATUS=SHORT*6D sentence through the serial port. The customer should check short circuit.

  • Page 25: Figure 12: Open Circuir Detection-B

    Smart Machine Smart Decision Figure 12: Open circuir detection-B If the antenna supply voltage is not derived from VCC_RF, do not exceed the maximum voltage rating of DET_N.(5V) SIM68R_Hardware Design_V1.02 2013-01-22...

  • Page 26: Electrical, Reliability And Radio Characteristics

    5 Electrical, Reliability and Radio Characteristics Absolute Maximum Ratings The absolute maximum ratings stated in Table 7 are stress ratings under non-operating conditions. Stresses beyond any of these limits will cause permanent damage to SIM68R. Table 7: Absolute maximum ratings Parameter...

  • Page 27: Electro-Static Discharge

    RXD, TXD ±4KV ±8KV RF_IN ±5KV ±10KV NRESET ±4KV ±8KV Certification SIM68R meets the requirements of Directive 2002/95/EC of the European Parliament and of the Council on the Restriction of Hazardous Substance (RoHS).and has acquired CE certification. SIM68R_Hardware Design_V1.02 2013-01-22...

  • Page 28: Manufacturing

    Assembly and Soldering The SIM68R module is intended for SMT assembly and soldering in a Pb-free reflow process on the top side of the PCB. Suggested solder paste stencil height is 150um minimum to ensure sufficient solder volume. If required SIM68R_Hardware Design_V1.02...

  • Page 29: Moisture Sensitivity

    Avoid ultrasonic exposure due to internal crystal and SAW components. Moisture sensitivity SIM68R module is moisture sensitive at MSL level 3, dry packed according to IPC/JEDEC specification J-STD-020C. The calculated shelf life for dry packed SMD packages is a minimum of 12 months from the bag seal date, when stored in a non condensing atmospheric environment of <40°C/90% RH.

  • Page 30: Esd Handling Precautions

    Smart Machine Smart Decision Factory floor life is 1 week for MSL 3, SIM68R must be processed and soldered within the time. If this time is exceeded, or the humidity indicator card in the sealed package indicates that they have been exposed to moisture, the devices need to be pre-baked before the reflow solder process.

  • Page 31: Reference Design

    Smart Machine Smart Decision 7 Reference Design Figure 15: Example application schematic with UART Notes: The pin VCC_RF provides a 2.8V output level for external active antenna. For active antenna, if antenna’s power domain is 2.8V, the pin VCC_RF could supply the voltage .Do not connect VCC_RF pin to RF_IN pin directly, use V_ANT pin to supply power.

  • Page 32: Appendix

    Smart Machine Smart Decision Appendix A. Related Documents Table 13: Related documents Document name Remark MT3333_data_sheet_external_V1.01 MT3333 datasheet CoreBuilder_User_Manual_0_4 CoreBuilder User Manual SIM28／68R／68V NMEA Messages SpecificationV1.00 EPO-II_Format_Protocol_Customer EPO-II_Format and Protocol B. Terms and Abbreviations Table 14: Terms and abbreviations Abbreviation Description Assisted Global Positioning System A-GPS...
  • Page 33 Smart Machine Smart Decision WAAS Wide Area Augmentation System MSAS Multi-Functional Satellite Augmentation System EASY Embedded Assist System DGPS Difference Global Positioning System SIM68R_Hardware Design_V1.02 2013-01-22...
  • Page 34 Smart Machine Smart Decision Contact us: Shanghai SIMCom Wireless Solutions Ltd. Add: SIM Technology Building,No.633,Jinzhong Road,Changning District,Shanghai P.R. China 200335 Tel: +86 21 3235 3300 Fax: +86 21 3235 3301 URL: www.sim.com/wm SIM68R_Hardware Design_V1.02 2013-01-22...

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