L80 Hardware Design GPS Module Series Rev. L80_Hardware_Design_V1.1 Date: 2013-08-10 www.quectel.com GPS Module L80 Hardware Design Our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarter: Quectel Wireless Solutions Co., Ltd. Room 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233 Tel: +86 21 5108 6236 Mail:info@quectel.com l e t l c a i e t u n Q fide n o C Or our local office, for more information, please visit: http://www.quectel.com/support/salesupport.aspx For technical support, to report documentation errors, please visit: http://www.quectel.com/support/techsupport.aspx GENERAL NOTES QUECTEL OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED IS BASED UPON CUSTOMERS' REQUIREMENTS. QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION. ALL INFORMATION SUPPLIED HEREIN ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE. COPYRIGHT THIS INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF QUECTEL CO., LTD. TRANSMITTABLE, REPRODUCTION, DISSEMINATION AND EDITING OF THIS DOCUMENT AS WELL AS UTILIZATION OF THIS CONTENTS ARE FORBIDDEN WITHOUT PERMISSION. OFFENDERS WILL BE HELD LIABLE FOR PAYMENT OF DAMAGES. ALL RIGHTS ARE RESERVED IN THE EVENT OF A PATENT GRANT OR REGISTRATION OF A UTILITY MODEL OR DESIGN. Copyright (c) Quectel Wireless Solutions Co., Ltd. 2013. All rights reserved. L80_Hardware_Design Confidential / Released 1 / 45 GPS Module L80 Hardware Design About the document History Revision V1.0 V1.1 l e t l c a i e t u n Q fide n o C Date Author Description 2013-07-25 Tony GAO Initial Tony GAO 1. Modified the voltage range of VCC pin. 2. Added AADET_N pin in Figure 1 Block Diagram, and the description of it in Table 3. 3. Modified the description about power supply in chapter 3.3. 4. Optimized the mechanical dimensions about the height in Figure 18. 5. Modified the structure of chapter 4. 6. Added content in chapter 4.3 about how to judge the antenna status via AADET_N pin. 2013-08-10 L80_Hardware_Design Confidential / Released 2 / 45 GPS Module L80 Hardware Design Contents About the document .................................................................................................................................2 Contents .....................................................................................................................................................3 Table Index .................................................................................................................................................5 Figure Index ...............................................................................................................................................6 1 Introduction ........................................................................................................................................7 2 Description .........................................................................................................................................8 2.1. General Description ...................................................................................................................8 2.2. Key Features ..............................................................................................................................9 2.3. Block Diagram ..........................................................................................................................10 2.4. Evaluation Board ...................................................................................................................... 11 2.5. The Protocols Module Supports .............................................................................................. 11 3 Application........................................................................................................................................12 3.1. Pin Assignment ........................................................................................................................12 3.2. Pin Definition ............................................................................................................................12 3.3. Power Supply ...........................................................................................................................14 3.4. Operating Modes......................................................................................................................16 3.4.1. Full On Mode ................................................................................................................17 3.4.2. Standby Mode ..............................................................................................................18 3.4.3. Backup Mode ...............................................................................................................18 3.4.4. Periodic Mode ..............................................................................................................19 3.4.5. AlwaysLocateTM Mode .................................................................................................21 3.5. Reset ........................................................................................................................................22 3.6. UART Interface.........................................................................................................................23 3.7. EASY Technology ....................................................................................................................25 3.8. Multi-tone AIC...........................................................................................................................25 3.9. LOCUS .....................................................................................................................................25 3.10. Antenna Supervisor .................................................................................................................26 4 Antenna Interface .............................................................................................................................27 4.1. Internal Patch Antenna.............................................................................................................27 4.1.1. 15*15*4 Patch Antenna ................................................................................................27 4.1.2. PCB Design Guide .......................................................................................................28 4.2. External Active Antenna ...........................................................................................................29 4.3. Antenna Status Indicator..........................................................................................................30 5 Electrical, Reliability and Radio Characteristics ..........................................................................33 5.1. Absolute Maximum Ratings .....................................................................................................33 5.2. Operating Conditions ...............................................................................................................34 5.3. Current Consumption ...............................................................................................................34 5.4. Electro-static Discharge ...........................................................................................................35 5.5. Reliability Test ..........................................................................................................................35 l e t l c a i e t u n Q fide n o C L80_Hardware_Design Confidential / Released 3 / 45 GPS Module L80 Hardware Design 6 Mechanics .........................................................................................................................................37 6.1. Mechanical View of the Module ...............................................................................................37 6.2. Bottom Dimension and Recommended Footprint....................................................................38 6.3. Top View of the Module ............................................................................................................39 6.4. Bottom View of the Module ......................................................................................................39 7 Manufacturing ..................................................................................................................................40 7.1. Assembly and Soldering ..........................................................................................................40 7.2. Moisture Sensitivity ..................................................................................................................41 7.3. ESD Safe..................................................................................................................................41 7.4. Tape and Reel ..........................................................................................................................41 7.5. Ordering Information ................................................................................................................42 8 Appendix Reference ........................................................................................................................43 l e t l c a i e t u n Q fide n o C L80_Hardware_Design Confidential / Released 4 / 45 GPS Module L80 Hardware Design Table Index TABLE 1: MODULE KEY FEATURES ................................................................................................................. 9 TABLE 2: THE PROTOCOLS MODULE SUPPORTS ....................................................................................... 11 TABLE 3: PIN DESCRIPTION ........................................................................................................................... 12 TABLE 4: MODULE STATES SWITCH ............................................................................................................. 16 TABLE 5: DEFAULT CONFIGURATIONS ......................................................................................................... 17 TABLE 6: PMTK COMMAND FORMAT ............................................................................................................ 20 TABLE 7: STATUS OF THE ANTENNA ............................................................................................................. 26 TABLE 8: ANTENNA SPECIFICATION FOR L80 MODULE WITH GROUND PLANE 100MMx60MM............ 27 l e t l c a i e t u n Q fide n o C TABLE 9: RECOMMENDED ACTIVE ANTENNA SPECIFICATION ................................................................. 30 TABLE 10: GPTXT - STATUS OF ANTENNA.................................................................................................... 31 TABLE 11: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 33 TABLE 12: THE MODULE POWER SUPPLY RATINGS .................................................................................. 34 TABLE 13: THE MODULE CURRENT CONSUMPTION .................................................................................. 34 TABLE 14: THE ESD ENDURANCE TABLE (TEMPERATURE: 25, HUMIDITY: 45 %) ............................... 35 TABLE 15: RELIABILITY TEST ......................................................................................................................... 35 TABLE 16: TRAY PACKING .............................................................................................................................. 42 TABLE 17: ORDERING INFORMATION ........................................................................................................... 42 TABLE 18: RELATED DOCUMENTS ................................................................................................................ 43 TABLE 19: TERMS AND ABBREVIATIONS ...................................................................................................... 43 L80_Hardware_Design Confidential / Released 5 / 45 GPS Module L80 Hardware Design Figure Index FIGURE 1: BLOCK DIAGRAM .......................................................................................................................... 10 FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 12 FIGURE 3: INTERNAL POWER CONSTRUCTION.......................................................................................... 14 FIGURE 4: REFERENCE CIRCUIT FOR POWER SUPPLY ............................................................................ 15 FIGURE 5: REFERENCE CHARGING CIRCUIT FOR CHARGEABLE BATTERY .......................................... 16 FIGURE 6: THE EXTERNAL SWITCH CIRCUIT FOR TIMER ......................................................................... 18 FIGURE 7: SEIKO MS920SE CHARGE AND DISCHARGE CHARACTERISTICS ......................................... 19 FIGURE 8: PERIODIC MODE ........................................................................................................................... 21 l e t l c a i e t u n Q fide n o C TM FIGURE 9: ALWAYSLOCATE MODE ............................................................................................................ 22 FIGURE 10: REFERENCE RESET CIRCUIT USING OC CIRCUIT ................................................................. 23 FIGURE 11: RESTART TIMING ........................................................................................................................ 23 FIGURE 12: CONNECTION OF SERIAL INTERFACES .................................................................................. 24 FIGURE 13: RS-232 LEVEL SHIFT CIRCUIT ................................................................................................... 24 FIGURE 14: PATCH ANTENNA TEST RESULT WITH GROUND PLANE 100MMx60MM .............................. 28 FIGURE 15: L80 MODULE PLACEMENT GUIDE ............................................................................................ 29 FIGURE 16: REFERENCE DESIGN FOR ACTIVE ANTENNA ........................................................................ 30 FIGURE 17: PATCH ANTENNA STATUS DESCRIPTION IN GPSTXT ............................................................ 31 FIGURE 18: MECHANICAL VIEWUNIT: MM ............................................................................................. 37 FIGURE 19: BOTTOM DIMENSIONUNIT: MM .......................................................................................... 38 FIGURE 20: FOOTPRINT OF RECOMMENDATIONUNIT: MM ................................................................ 38 FIGURE 21: TOP VIEW OF THE MODULE ...................................................................................................... 39 FIGURE 22: BOTTOM VIEW OF THE MODULE .............................................................................................. 39 FIGURE 23: RAMP-SOAK-SPIKE-REFLOW OF FURNACE TEMPERATURE ............................................... 40 FIGURE 24: TAPE AND REEL SPECIFICATION .............................................................................................. 41 L80_Hardware_Design Confidential / Released 6 / 45 GPS Module L80 Hardware Design 1 Introduction This document defines and specifies L80 GPS module. It describes L80 module hardware interfaces and its external application reference circuits, mechanical size and air interface. This document can help you quickly understand the interface specifications, electrical and mechanical details of L80 module. Other documents such as L80 software application notes and user guider are also provided for you. These documents can ensure you use L80 module to design and set up applications quickly. l e t l c a i e t u n Q fide n o C L80_Hardware_Design Confidential / Released 7 / 45 GPS Module L80 Hardware Design 2 Description 2.1. General Description L80 GPS module with an embedded patch antenna (15mmx15mmx4mm) and LNA brings high performance of MTK positioning engine to the industrial applications. It is able to achieve the industry's highest level of sensitivity, accuracy and TTFF with the lowest power consumption in a small-footprint lead-free package. With 66 search channels and 22 simultaneous tracking channels, it acquires and tracks satellites in the shortest time even at indoor signal level. The embedded flash memory provides capacity for users to store some useful navigation data and allows for future updates. l e t l c a i e t u n Q fide n o C L80 module combines with many advanced features including EASY, AIC, LOCUS, AlwaysLocateTM and Antenna Supervisor. These features are beneficial to accelerate TTFF, improve sensitivity, save consumption and detect antenna status for GPS system. The module supports various location, navigation and industrial applications including autonomous GPS, SBAS (including WAAS, EGNOS, MSAS, and GAGAN), QZSS, and AGPS. L80 simplifies the device's design and cost because of embedded Patch Antenna and LNA. Furthermore, L80 not only supports automatic antenna switching function, which can achieve switching between external active antenna and internal patch antenna but also supports external active antenna detection and short protection. The detection and notification of different external active antenna status will be shown in the NMEA message including external active antenna connection, open circuit for antenna and antenna shortage. So host can query the external active antenna status timely and conveniently. L80 module is a SMD type module with the compact 16mm x 16mm x 6.45mm form factor, which can be embedded in your applications through the 12-pin pads with 2.54mm pitch. It provides necessary hardware interfaces between the module and main board. The module is fully ROHS compliant to EU regulation. L80_Hardware_Design Confidential / Released 8 / 45 GPS Module L80 Hardware Design 2.2. Key Features Table 1: Module Key Features Feature Implementation Power Supply Supply Voltage: 3.0V ~ 4.3V Power Consumption Acquisition Tracking Standby Backup Receiver Type GPS L1 1575.42MHz C/A Code 66 search channels, 22 simultaneous tracking channels Sensitivity Acquisition Re-acquisition Tracking -148dBm -160dBm -165dBm TTFF (EASY enabled) Cold Start Warm Start Hot Start 15s typ.@-130dBm 5s typ.@-130dBm 1s typ. @-130dBm TTFF (EASY disabled) Cold Start (Autonomous) Warm Start (Autonomous) Hot Start (Autonomous) Horizontal Position Accuracy (Autonomous) <2.5m CEP@-130dBm Max Update Rate Up to 10Hz,1Hz by default Accuracy of 1PPS Signal Typical accuracy <15ns (Time service is not supported) Time pulse width 100ms Velocity Accuracy Without Aid 0.1m/s Acceleration Accuracy Without Aid 0.1m/s Dynamic Performance Maximum Altitude 18,000m Maximum Velocity 515m/s Maximum Acceleration 4G UART Port: TXD1 and RXD1 Supports baud rate from 4800bps to 115200bps,9600bps by default UART port is used for NMEA output, MTK proprietary commands input and firmware upgrade Temperature Range Normal operation: -40C ~ +85C Storage temperature: -45C ~ +125C Physical Characteristics Size: 160.15 x 160.15 x 6.450.1mm Weight: Approx. 6.0g typical : 3.3V 25mA@ VCC=V_BCKP=3.3V 20mA@ VCC= V_BCKP =3.3V 1.0mA @ VCC= V_BCKP =3.3V 7uA@ V_BCKP=3.3V l e t l c a i e t u n Q fide n o C UART Port L80_Hardware_Design 35s typ.@-130dBm 30s typ.@-130dBm 1s typ.@-130dBm Confidential / Released 9 / 45 GPS Module L80 Hardware Design NOTES 1. The power consumption is measured in the open sky with internal patch antenna, meanwhile, EASY, AIC and SBAS are enabled. 2. If the external active antenna is used, VCC pin will supply power for external active antenna. The typical additional current consumption is about 11mA@3.3V. 3. The performance of external active antenna is similar to that of internal patch antenna expect for power consumption. l e t l c a i e t u n Q fide n o C 2.3. Block Diagram The following figure shows a block diagram of L80 module. It consists of a single chip GPS IC which includes RF part and Baseband part, a SPDT, a patch antenna, a LNA, a SAW filter, a TCXO, a crystal oscillator, short protection and antenna detection circuit for active antenna. LNA SAW Filter RF Front End Active Interference Cancellation Integrated LNA SPDT Patch Antenna TCXO 26M GPS Engine ROM Fractional-N Synthesizer ARM7 Processor RAM Flash RTC EX_ ANT GPIO XTAL 32.768K Protection Circuit Active Antenna Detection Peripheral Controller PMU UART RESET AADET_N 1PPS TIMER V_BCKP VCC Figure 1: Block Diagram L80_Hardware_Design Confidential / Released 10 / 45 GPS Module L80 Hardware Design 2.4. Evaluation Board In order to help you use L80 module on your applications, Quectel supplies an Evaluation Board (EVB) with micro USB serial cable and other peripherals to test the module. For more details, please refer to the document [1]. 2.5. The Protocols Module Supports l e t l c a i e t u n Q fide n o C Table 2: The Protocols Module Supports Protocol NMEA PMTK NOTE Type Output, ASCII, 0183, 3.01 Input, MTK proprietary protocol Please refer to document [2] about NMEA standard protocol and MTK proprietary protocol. L80_Hardware_Design Confidential / Released 11 / 45 GPS Module L80 Hardware Design 3 Application The module is equipped with a 12-pin 2.54mm pitch SMT pad that connects to your application platform. Sub-interfaces included in these pads are described in details in the following chapters. l e t l c a i e t u n Q fide n o C 3.1. Pin Assignment 1PPS 6 V_BCKP 5 VCC 4 GND 3 EX_ANT TXD1 2 GND RXD1 1 7 TIMER 8 AADET_N 9 NC 10 RESET 11 12 L80 (Top View) Figure 2: Pin Assignment 3.2. Pin Definition Table 3: Pin Description Power supply Pin Name VCC V_BCKP Pin No. 4 5 L80_Hardware_Design I/O Description DC Characteristics Comment I Main power supply Vmax= 4.3V Vmin=3.0V Vnom=3.3V Supply current of no less than 100mA. I Backup power supply Vmax=4.3V Vmin=1.5V Vnom=3.3V Supply power for RTC domain. The V_BCKP pin can be directly supplied Confidential / Released 12 / 45 GPS Module L80 Hardware Design power by battery connect it to VCC. or Reset Pin Name Pin No. RESET UART port Pin Name RXD1 TXD1 10 I/O I Description DC Characteristics Comment System reset VILmin=-0.3V VILmax=0.8V VIHmin=2.0V VIHmax=3.6V Low level active. If unused, keep this pin open or connect it to VCC. l e t l c a i e t u n Q fide n o C Pin No. 1 I/O I Description DC Characteristics Receive data VILmin=-0.3V VILmax=0.8V VIHmin=2.0V VIHmax=3.6V Comment 2 O Transmit data VOLmin=-0.3V VOLmax=0.4V VOHmin=2.4V VOHmax=3.1V Pin No. I/O Description DC Characteristics Comment I external active antenna RF input Characteristic impedance of 50 If unused, keep this pin open. I/O Description DC Characteristics Comment O One pulse per second VOLmin=-0.3V VOLmax=0.4V VOHmin=2.4V VOHmax=3.1V Synchronized at rising edge, the pulse width is100ms. If unused, keep this pin open. O An open drain output signal can be used to control GPS module main power on/off VOLmin=-0.3V VOLmax=0.4V VOHmin=1.1V VOHmax= 3.1V It belongs to RTC domain. If unused, keep this pin open or connect to Ground externally. I/O Active antenna detection VOLmax=0.7V VOHmin=1.3V If unused, keep this pin open. Refer to chapter 4.3. RF interface Pin Name EX_ANT 11 Other interfaces Pin Name 1PPS TIMER AADET_N Pin No. 6 7 8 L80_Hardware_Design Confidential / Released 13 / 45 GPS Module L80 Hardware Design 3.3. Power Supply VCC pin supplies power for BB, RF, I/O, LNA, short protection and antenna detection circuit. The load current of VCC varies according to the VCC level, processor load, the number of tracked satellites and the rate of satellite re-acquisition. Using external active antenna will consume additional 11mA from our module. So it is important to supply sufficient current and make the power clean and stable. VCC supply ripple voltage should meet the requirement: 54 mV (RMS) max @ f = 0... 3MHz and 15 mV (RMS) max @ f > 3MHz. You should choose the LDO without built-in output high-speed discharge function to keep long output voltage drop-down period. The decouple combination of 10uF and 100nF capacitor is recommended nearby VCC pin. l e t l c a i e t u n Q fide n o C The V_BCKP pin supplies power for RTC domain. It should be valid when power on the module. The voltage of RTC domain ranges from 1.5V to 4.3V. In order to achieve a better TTFF, RTC domain should be valid all the time. It can supply power for SRAM memory in RTC domain which contains all the necessary GPS information for quick start-up and a small amount of user configuration variables. The module's internal power construction is shown as below. VCC supplies power for PMU and V_BCKP supplies power for RTC domain. TIMER signal highlighted in red in the following figure belongs to RTC domain and can be used to control the power switch on/off. L80_Module Power Switch PMU 4 VCC ARM 7 Logic Circuit TIMER 5 V_BCKP RTC Power RTC Figure 3: Internal Power Construction Power supply solutions for L80 module are listed as the following. The simplest power circuit for L80 module is 3.3V power source connected to VCC pin and V_BCKP pin of the module directly. In this case, once you powered on the module, the full cold start will be implemented. L80_Hardware_Design Confidential / Released 14 / 45 GPS Module L80 Hardware Design 3.3V 4 C1 10uF VCC C2 100nF L80_Module C3 5 V_BCKP 100nF l e t l c a i e t u n Q fide n o C Figure 4: Reference Circuit for Power Supply NOTE If your power supply circuit adopts the design mentioned above, L80 module does not support EASY technology and backup mode and other modes related with it, e.g. AlwaysLocateTM backup mode. The other way is V_BCKP is fed through a backup battery directly. The module will enter into backup mode when power source (3.3V) is cut off. Furthermore, it is necessary to add an external charging circuit for rechargeable battery. The detailed schematic (mount R2 with 0R to replace Power switch) is shown as below. Note that the capacity of backup battery should be large enough to maintain V_BCKP valid as there is no charge source when power source (3.3V) is cut off. MS621FE FL11E from Seiko is recommended. The consumption of V_BCKP is as low as 7uA in backup mode. You can also apply a power switch circuit to replace R2 when it matches with TIMER pin. In this way, the module will not only support backup mode but also support periodic backup mode and AlwaysLocateTM backup mode. The schematic with power supply circuit is shown as below. As power source (3.3V) is always valid and charge the battery continuously. The capacity of the battery can be small. The detail schematic for power switch circuit is shown in Figure 6. For more details about backup mode, periodic backup mode and AlwaysLocateTM backup mode, please refer to the related chapters. L80_Hardware_Design Confidential / Released 15 / 45 GPS Module L80 Hardware Design R2 NC Power Switch 3.3V VCC C1 D1 Charging Circuit 4 C2 10uF 100nF TIMER L80_Module R1 1K 5 Rechargeable Battery C3 V_ BCKP C4 l e t l c a i e t u n Q fide n o C 4.7uF 100nF Figure 5: Reference Charging Circuit for Chargeable Battery NOTE VCC does not supply power for RTC domain in L80 module, so the V_BCKP pin must be powered externally. Furthermore, it is strongly recommended to supply power to V_BCKP through a backup battery, which can ensure L80 module supports EASY technology and improves TTFF after next restart. For details about TTFF, please refer to chapter 2.2. 3.4. Operating Modes The table below briefly illustrates the relationship among different operating modes of L80 module. Table 4: Module States Switch Current Mode Next Mode Backup Standby Full on Periodic AlwaysLocateTM Backup N/A N/A Refer to chapter 3.4.3 N/A N/A Standby N/A N/A Send any data via UART N/A N/A Full on Refer to chapter 3.4.3 PMTK 161 N/A Refer to chapter 3.4.4 Refer to chapter 3.4.5 Periodic N/A N/A Refer to chapter 3.4.4 N/A N/A L80_Hardware_Design Confidential / Released 16 / 45 GPS Module L80 Hardware Design Always LocateTM N/A N/A Refer to chapter 3.4.5 N/A N/A NOTE Please refer to document [2] about MTK proprietary protocol for more details. 3.4.1. Full On Mode l e t l c a i e t u n Q fide n o C Full on mode includes tracking mode and acquisition mode. Acquisition mode is defined as the module starts to search satellites, determine visible satellites and coarse carrier frequency and code phase of satellite signals. When the acquisition is completed, it switches to tracking mode automatically. Tracking mode is defined as the module keeps tracking satellites and demodulates the navigation data from the specific satellites. When the combination of VCC and V_BCKP is valid, the module will enter into full on mode automatically and follow the default configurations as below. You can refer to chapter 3.3 about internal power construction to have a good comprehension. You can also use PMTK commands to change the configurations to satisfy your requirements. Table 5: Default Configurations Item Baud rate Protocol Update rate SBAS AIC Configuration 9600bps NMEA RMC, VTG, GGA, GSA, GSV, GLL and GPTXTMTK proprietary protocol 1Hz Enable Enable LOCUS Disable EASY Enable L80_Hardware_Design Comment EASY will be disabled automatically when update rate exceeds 1Hz. Confidential / Released 17 / 45 GPS Module L80 Hardware Design 3.4.2. Standby Mode Standby mode is a low-power mode. In standby mode, the internal core and I/O power domain are still active, but RF and TCXO are powered off, the module stops satellites search and navigation. UART is still accessible like PMTK commands or any other data, but there is no NMEA messages output. Sending PMTK command "$PMTK161,0*28" will make L80 module enter into standby mode. Sending any data via UART can wake the module up. When the module exits from standby mode, it will use all internal aiding information like GPS time, Ephemeris, Last Position etc, resulting to a fastest possible TTFF in either Hot or Warm start. The typical standby current consumption in this way is about 1mA @VCC=3.3V. NOTE l e t l c a i e t u n Q fide n o C When the external active antenna is used, an additional 11mA will be consumed because the VCC still supply power for external active antenna in standby mode. 3.4.3. Backup Mode Backup mode is a lower power mode than standby mode. In this mode, only the backup supply V_BCKP is powered on while the main supply VCC is switched off by host or the TIMER signal of L80. In order to enter into backup mode autonomously via the TIMER pin, an external switch circuit is necessary. The following figure has shown a typical reference design about the switch circuit for TIMER. Power Switch LDO_3.3V R1 47K VIN VOUT EN GND VCC_3.3V D1 TIMER D2 U1 ADP191 GPS_EN Figure 6: The External Switch Circuit for TIMER NOTES 1. 2. U1 is an integrated power switch component. The part number ADP191 is recommended. U1 also can be replaced by discrete components, please refer to document [3] for more details. TIMER pin also can be used to control the EN pin of a LDO. L80_Hardware_Design Confidential / Released 18 / 45 GPS Module L80 Hardware Design 3. 4. TIMER and GPS_EN signals form an "OR" logic via the Schottky diodes D1 and D2. GPS_EN is a GPIO signal coming from the host. TIMER is an open drain output signal. When TIMER pin is used, please pull it high by using an external resistor. R1 is the pull-up resistor for TIMER signal. Keeping GPS_EN signal low and sending PMTK command"$PMTK225,4*2F" will make L80 module enter into backup mode forever. When this command is executed successfully, TIMER signal will be pulled down to close the power switch, so L80 module can go into backup mode as the main power VCC is cut off. For this case, pulling the GPS_EN signal high by host is the only way to wake the module up. In backup mode, L80 module stops to acquire and track satellites. UART is not accessible. But the backed-up memory in RTC domain which contains all the necessary GPS information for quick start-up and a small amount of user configuration variables is alive. Due to the backed-up memory, EASY technology is available. The typical consumption in backup mode can be as low as 7uA. l e t l c a i e t u n Q fide n o C As the main power supply for V_BCKP pin is battery. Coin-type Rechargeable Capacitor such as MS920SE from Seiko can be used and Schottky diode such as RB520S30T1G from ON Semiconductor is recommended to be used here for its low voltage drop. Figure 7: Seiko MS920SE Charge and Discharge Characteristics 3.4.4. Periodic Mode Periodic mode is a power saving mode of L80 that can control the full on mode and standby/backup mode periodically to reduce power consumption. It contains periodic standby mode and periodic backup mode. The format of the command which enters into periodic mode is as follows: L80_Hardware_Design Confidential / Released 19 / 45 GPS Module L80 Hardware Design Table 6: PMTK Command Format Format: $PMTK225,<Type>,<Run_time>,<Sleep_time>,<2nd_run_time>,<2nd_sleep_time>*<checksum>< CR><LF> Parameter Format Description Type Decimal Type=1 for Periodic Backup Mode Type=2 for Periodic Standby Mode Run_time Decimal Full on period (ms) Sleep_time Decimal Standby/Backup period (ms) 2nd_run_time Decimal Full on period (ms) for extended acquisition in case GPS module acquisition fails during the Run_time 2nd_sleep_time Decimal Standby/Backup period (ms) for extended sleep in case GPS module acquisition fails during the Run_time Checksum Hexadecimal Hexadecimal checksum l e t l c a i e t u n Q fide n o C Example: $PMTK225,1,3000,12000,18000,72000*16<CR><LF> $PMTK225,2,3000,12000,18000,72000*15<CR><LF> Sending "$PMTK225,0*2B" in any time will make the module to enter full on mode from periodic standby mode. Sending "$PMTK225,0*2B" just in Run_time or 2nd_run_time can make the module to enter full on mode from periodic backup mode. NOTES 1. 2. The precondition is external switch circuit supports periodic backup mode. For details, please refer to chapter 3.4.3. Before entering into periodic backup mode, please ensure the GPS_EN signal is low and power supply for V_BCKP is alive. The following figure has shown the operation of periodic mode. When you send PMTK command, the module will be in the full on mode firstly. After several minutes, the module will enter into the periodic mode and follow the parameters set by you. When the module fails to fix the position in run time, the module will switch to 2nd_run_time and 2nd_sleep_time automatically. As long as the module fixes the position again, the module will return to Run_time and Sleep_time. Please ensure the module is in the tracking state before entering into periodic mode. Otherwise, the module will have a risk of failure to track the satellites. If GPS module is located in weak signal L80_Hardware_Design Confidential / Released 20 / 45 GPS Module L80 Hardware Design environment, it is better to set the longer 2nd_run_time to ensure the success of re-acquisition. The average current value can be calculated by the following formula: I periodic= (I trackingx T1+Istandby/backupx T2)/ (T1+T2) T1: Run_time, T2: Sleep_time Example: PMTK225,2,3000,12000,18000,72000*15 for periodic mode with 3s in tracking mode and 12s in standby mode. The average current consumption is calculated below: I periodic= (I trackingx T1+I standbyx T2 )/(T1+T2)=(20mAx 3s + 1mAx 12s)/(3s+12s)4.8 (mA) PMTK225,1,3000,12000,18000,72000*16 for periodic mode with 3s in tracking mode and 12s in backup mode. The average current consumption is calculated below: I periodic= (I trackingx T1+I backupx T2)/ (T1+T2)=(20mAx 3s + 0.007mAx 12s)/(3s+12s)4.0 (mA) Power l e t l c a i e t u n Q fide n o C Full on Run_time Run_time Sleep_time Sleep_time 2nd_run_time 2nd_sleep_time 2nd_run_time 2nd_sleep_time Run_time Run_time Sleep_time Sleep_time Figure 8: Periodic Mode 3.4.5. AlwaysLocateTM Mode AlwaysLocateTM is an intelligent power saving mode. It contains AlwaysLocateTM backup mode and AlwaysLocateTM standby mode. AlwaysLocateTM standby mode supports the module to switch automatically between full on mode and standby mode. According to the environmental and motion conditions, the module can adaptively adjust the full on time and standby time to achieve a balance between positioning accuracy and power consumption. Sending "$PMTK225,8*23" and the module returning: "$PMTK001,225,3*35" means the module accesses AlwaysLocateTM standby mode successfully. It will benefit power saving in this mode. Sending "$PMTK225,0*2B" in any time will make the module back to full on mode. AlwaysLocateTM backup mode is similar to AlwaysLocateTM standby mode. The difference is that AlwaysLocateTM backup mode can switch between full on mode and backup mode automatically. The PMTK command to enter into AlwaysLocateTM backup mode is "$PMTK225,9*22".The module can exit from AlwaysLocateTM backup mode by command "$PMTK225,0*2B" sent just after the module has been L80_Hardware_Design Confidential / Released 21 / 45 GPS Module L80 Hardware Design waked up from previous backup cycle. The positioning accuracy in AlwaysLocateTM mode will be somewhat degraded, especially in high speed. The following picture shows the rough power consumption of L80 module in different daily scenes when AlwaysLocateTM mode is enabled. l e t l c a i e t u n Q fide n o C Figure 9: AlwaysLocateTM Mode Example: The typical average consumption is about 3.5mA in AlwaysLocateTM standby mode and 3.0mA in AlwaysLocateTM backup mode. NOTES 1. 2. Power consumption is measured under outdoor static mode with patch antenna. Using external active antenna will increase the power consumption. Before entering into periodic backup mode, please ensure the GPS_EN signal is low and power supply for V_BCKP is alive. 3.5. Reset L80 module can be restarted by driving the RESET to a low level voltage for a certain time and then releasing it. This operation will reset the digital part of the GPS receiver. Note that Non-Volatile Backup RAM content is not cleared and thus fast TTFF is possible. An OC driver circuit shown as below is recommended to control the RESET. L80_Hardware_Design Confidential / Released 22 / 45 GPS Module L80 Hardware Design RESET 4.7K Input pulse 47K l e t l c a i e t u n Q fide n o C Figure 10: Reference Reset Circuit Using OC Circuit The restart timing of L80 has been illustrated bellow. Pulldown > 10ms > 650us VCC RESET UART VIH >2.0V VIL<0.8V Invalid Valid Invalid Valid Figure 11: Restart Timing 3.6. UART Interface The module provides one universal asynchronous receiver & transmitter serial port. The module is designed as a DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection. The module and the client (DTE) are connected through the following signals shown as following figure. It supports data baud-rate from 4800bps to 115200bps. UART port: TXD1: Send data to the RXD signal line of DTE. RXD1: Receive data from the TXD signal line of DTE. L80_Hardware_Design Confidential / Released 23 / 45 GPS Module L80 Hardware Design Module(DCE) Customer(DTE) UART port TXD1 TXD RXD1 RXD GND GND Figure 12: Connection of Serial Interfaces l e t l c a i e t u n Q fide n o C This UART port has the following features: UART port can be used for firmware upgrade, NMEA output and PMTK proprietary commands input. The default output NMEA type setting is RMC, VTG, GGA, GSA, GSV, GLL and GPTXTMTK proprietary protocol. UART port supports the following data rates: 4800, 9600, 14400, 19200, 38400, 57600, 115200. The default setting is 9600bps, 8 bits, no parity bit, 1 stop bit. Hardware flow control and synchronous operation are not supported. The UART port does not support the RS-232 level but only CMOS level. If the module's UART port is connected to the UART port of a computer, it is necessary to add a level shift circuit between the module and the computer. Please refer to the following figure. SP3238 28 25 1 3 TXD1 Module 3.3V V+ C1- GND C2+ VCC C2- V- 24 23 22 19 T1IN T2IN T3IN T4IN 17 T5IN 16 21 20 18 RXD1 C1+ 13 /R1OUT R1OUT R2OUT R3OUT T4OUT T2OUT T3OUT T1OUT T5OUT R1IN R2IN R3IN 27 2 26 3.3V 4 10 6 7 5 12 8 9 11 ONLINE 15 /STATUS 14 /SHUTDOWN 6 7 8 9 To PC serial port 1 2 3 4 5 GND Figure 13: RS-232 Level Shift Circuit L80_Hardware_Design Confidential / Released 24 / 45 GPS Module L80 Hardware Design 3.7. EASY Technology EASY technology works as embedded software which can accelerate TTFF by predicting satellite navigation messages from received ephemeris. The GPS engine will calculate and predict orbit information automatically up to 3 days after first receiving the broadcast ephemeris, and saving the predicted information into the internal memory. GPS engine will use this information for positioning if no enough information from satellites, so the function will be helpful for positioning and TTFF improvement. The EASY function can reduce TTFF to 5s for warm start. In this case, RTC domain should be valid. In order to get enough broadcast ephemeris information from GPS satellites, the GPS module should receive the information for at least 5 minutes in a good signal condition after fixing the position. l e t l c a i e t u n Q fide n o C EASY function is enabled by default. The command "$PMTK869,1,0*34" can be used to disable EASY. For more details, please refer to the document [2]. 3.8. Multi-tone AIC L80 module provides an advanced technology called multi-tone AIC (Active Interference Cancellation) to reject RF interference which comes from other active components on the main board. Up to 12 multi-tone AIC embedded in the module can provide effective narrow-band interference and jamming elimination. The GPS signal could be recovered from the jammed signal, which can ensure better navigation quality. AIC is enabled by default, closing it will save about 1mA @VCC=3.3V consumption. The following commands can be used to set AIC. Enable AIC function: "$PMTK 286,1*23". Disable AIC function: "$PMTK 286,0*22". 3.9. LOCUS L80 module supports the embedded logger function called LOCUS. It can log position information to the internal flash memory automatically when this function is enabled by sending PMTK command "$PMTK185, 0*22". Due to this function, the host can go to sleep to save power consumption and do not need to receive the NMEA information all the time. The module can provide a log capacity of more than 16 hours. The detail procedures of this function are illustrated as bellow: The module has fixed the position (only 3D_fixed is available); Sending PMTK command "$PMTK184,1*22" to erase internal flash; Sending PMTK command "$PMTK185,0*22" to start log; L80_Hardware_Design Confidential / Released 25 / 45 GPS Module L80 Hardware Design Module logs the basic information (UTC time, latitude, longitude and height) every 15 seconds to internal flash memory; Stop logging the information by sending "$PMTK185,1*23"; Host can get the data from the module via UART by sending"$PMTK622,1*29". The raw data which host gets has to be parsed via LOCUS parser code provided by Quectel. For more details, please contact Quectel's technical support team. 3.10. Antenna Supervisor l e t l c a i e t u n Q fide n o C Antenna Supervisor is designed to detect different external active antenna status including external active antenna connection, open circuit for antenna and antenna shortage and then notify the module. The detections and notifications of external active antenna are listed in the following table. Table 7: Status of the Antenna Status of the Antenna EXT/Patch NMEA Message External active antenna is not inserted Patch OPEN External active antenna is inserted and worked normally EXT OK External active antenna is inserted but short-circuited Patch SHORT L80_Hardware_Design Confidential / Released 26 / 45 GPS Module L80 Hardware Design 4 Antenna Interface L80 module receives L1 band signal from GPS satellites at a nominal frequency of 1575.42MHz. The LNA is embedded for better performance. It is an ultra compact module with embedded 15.0x15.0x4.0mm patch antenna, in addition, L80 can also support external active antenna, and the RF signal is obtained from the EX_ANT pin. Both internal patch signal and external active antenna signal are intelligently switched through SPDT. l e t l c a i e t u n Q fide n o C 4.1. Internal Patch Antenna 4.1.1. 15*15*4 Patch Antenna The quality of the embedded GPS antenna is crucial to the overall sensitivity of the GPS system. L80 offers an on-module patch antenna. A 15.0x15.0x4.0mm high-performance patch antenna is chosen for reducing product size. This antenna is specially designed for satellite reception applications. And it has excellent stability and sensitivity to consistently provide high signal reception efficiency. The specification of the antenna used by L80 is described in following table. Table 8: Antenna Specification for L80 Module with Ground Plane 100mmx60mm Antenna type Patch antenna Parameter Specification Notes Size 15.0x15.0x4.0mm Range of receiving Frequency 1575.42MHz1.023MHz Impendence 50 Ohm Band Width 10MHz minimum Return Loss -10dB Frequency Temperature Coefficient (TF) 020ppm/C -40C-85C Polarization RHCP Right Hand Circular Polarization Gain at Zenith 3.4dBi typ VSWR 1.5 max Centre frequency L80_Hardware_Design Confidential / Released 27 / 45 GPS Module L80 Hardware Design Axial ratio 3 dB max The test result of the antenna is shown as the following figure. This embedded GPS antenna provides good radiation efficiency, right hand circular polarization and optimized radiation pattern. The antenna is insensitive to surroundings and has high tolerance against frequency shifts. l e t l c a i e t u n Q fide n o C Figure 14: Patch Antenna Test Result with Ground Plane 100mmx60mm 4.1.2. PCB Design Guide Radiation characteristics of antenna depend on various factors, such as the size and shape of the PCB, the dielectricconstant of components nearby. For the best performance, it is recommended to follow these rules listed as below. Keep at least 10mm distance to the nearest edge of the mother board. It will be better for L80 to be placed in the center of the mother board. L80_Hardware_Design Confidential / Released 28 / 45 GPS Module L80 Hardware Design Keep enough distance between L80 antenna and tall components, the height of which is more than 6mm, and the minimum distance (d) is 10mm. Put L80 on the top of the main PCB, which can guarantee antenna to face to open sky and achieve good receiving performance during operation. Device enclosure should be made of non-metal materials especially around antenna area. The minimum distance between antenna and enclosure is 1mm. It is recommended that the mother board is bigger than 80mmx40mm for the better performance. And pour ground copper on the whole mother board. l e t l c a i e t u n Q fide n o C Other antennas such as BT\WIFI\GSM should be kept minimum 10mm distance far away from the embedded patch antenna in L80. Integrated chips d d d d Other antenna Mother board L80-M39 d Metal components BT/WIFI/GSM d is supposed to be greater than 10mm and no metal cover used for this area. Figure 15: L80 Module Placement Guide 4.2. External Active Antenna The following figure is a typical reference design with active antenna. In this mode, DC on the EX_ANT pin is powered by VCC and supplies power to the external active antenna. L80_Hardware_Design Confidential / Released 29 / 45 GPS Module L80 Hardware Design Active Antenna 0R C2 NM C1 NM R1 EX_ANT L80_Module matching circuit Figure 16: Reference Design for Active Antenna l e t l c a i e t u n Q fide n o C C1, R1, C2 are reserved matching circuit for antenna impedance modification. By default, C1 and C2 are not mounted, R1 is 0 ohm. In this mode, R1 must not be capacitance, as current will stream through R1 to the active antenna. C1 and C2 must not be inductance or resistance to avoid short circuit. The impedance of RF trace line in main PCB should be controlled by 50 Ohm, and the length should be kept as short as possible. Table 9: Recommended Active Antenna Specification Antenna Type Specification Active antenna Center frequency: Band width : VSWR: Polarization: Noise figure: Gain (antenna): Gain (embedded LNA): Total Gain: 1575.42MHz >5MHZ <2 (Typ.) RHCP or Linear <1.5dB >-2dBi 20dB (Typ.) >18dBi(Typ.) 4.3. Antenna Status Indicator L80 module supports automatic antenna switching function. The GPTXT sentence can be used to identify the status of external active antenna. If ANTSTATUS=OPEN, it means external active antenna is not connected or has poor contact with antenna feeding point and the internal antenna is used. If ANTSTATUS=OK, it means external active antenna is connected and the module will use external active antenna. L80_Hardware_Design Confidential / Released 30 / 45 GPS Module L80 Hardware Design If ANTSTATUS=SHORT, it means active antenna is short circuited and the internal patch antenna will be used automatically. NOTES 1. 2. 3. When you use external active antenna and the "OPEN" is displayed in the GPTXT of NMEA sentence, you have to check the connection status of external active antenna. If the external active antenna is short-circuited, the "SHORT" will be displayed in the GPTXT of NMEA sentence. Because antenna short protection is enabled by default, L80 will switch to embedded patch antenna automatically in case that external active antenna is short-circuited, which will avoid L80 from damage. Meanwhile, you need to check the external active antenna. l e t l c a i e t u n Q fide n o C Example: "OPEN" is displayed in the GPTXT sentence as below Figure 17: Patch Antenna Status Description in GPSTXT Table 10: GPTXT - Status of Antenna GPTXT Display Ext Active Antenna Status Inner Patch Antenna Status Attention Unused Working You need to check the external active antenna status if the active antenna is using. OK Working Unused SHORT Short Working OPEN L80_Hardware_Design Please check the external active antenna Confidential / Released 31 / 45 GPS Module L80 Hardware Design The pin "AADET_N" also can be used to indicate the status of active antenna. When active antenna is not connected to EX_ANT or has poor contact with antenna feeding point, AADET_N will keep a high level to indicate the active antenna absent. AADET_N will change to a low level when active antenna is connected well. NOTE Active antenna is ONLY available when the voltage of AADET_N is less than or equal to 0.7 V. l e t l c a i e t u n Q fide n o C L80_Hardware_Design Confidential / Released 32 / 45 GPS Module L80 Hardware Design 5 Electrical, Reliability and Radio Characteristics l e t l c a i e t u n Q fide n o C 5.1. Absolute Maximum Ratings Absolute maximum ratings for power supply and voltage on digital pins of the module are listed in the following table. Table 11: Absolute Maximum Ratings Parameter Min Max Unit Power supply voltageVCC -0.3 5.0 V Backup battery voltage (V_BCKP) -0.3 5.0 V Input voltage at digital pins -0.3 3.6 V 0 dBm 125 C Input power at EX_ANT Storage temperature NOTE -45 Stressing the device beyond the "Absolute Maximum Ratings" may cause permanent damage. These are stress ratings only. The product is not protected against over voltage or reversed voltage. If necessary, voltage spikes exceeding the power supply voltage specification, given in table above, must be limited to values within the specified boundaries by using appropriate protection diodes. L80_Hardware_Design Confidential / Released 33 / 45 GPS Module L80 Hardware Design 5.2. Operating Conditions Table 12: The Module Power Supply Ratings Parameter VCC IVCCP V_BCKP TOPR NOTE Description Conditions Min Typ Max Unit Supply voltage Voltage must stay within the min/max values, including voltage drop, ripple, and spikes. 3.0 3.3 4.3 V l e t l c a i e t u n Q fide n o C Peak supply current VCC=3.3V 100 mA Backup voltage supply 1.5 3.3 4.3 V Normal Operating temperature -40 25 85 1. The figure IVCCP can be used to determine the maximum current capability of power supply. 2. Operation beyond the "Operating Conditions" is not recommended and extended exposure beyond the "Operating Conditions" may affect the device's reliability. 5.3. Current Consumption The values for current consumption are shown in the following table. Table 13: The Module Current Consumption Parameter Conditions Min Typ Max Unit IVCC@Acquisition VCC=V_BCKP=3.3V 25 mA IVCC@Tracking VCC= V_BCKP=3.3V 20 mA IVCC@Standby VCC= V_BCKP=3.3V 1.0 mA IBCKP@Backup V_BCKP=3.3V 7 uA L80_Hardware_Design Confidential / Released 34 / 45 GPS Module L80 Hardware Design NOTE The tracking current is tested in the following conditions: For Cold Start, 10 minutes after First Fix. For Hot Start, 15 seconds after First Fix. 5.4. Electro-static Discharge L80 module is an ESD sensitive device. ESD protection precautions should still be emphasized. Proper ESD handing and packaging procedures must be applied throughout the processing, handing and operation of any application. l e t l c a i e t u n Q fide n o C The ESD bearing capability of the module is listed in the following table. Note that you should add ESD components to module pins in the particular applications. Table 14: The ESD Endurance Table (Temperature: 25, Humidity: 45 %) Pin Contact Discharge Air Discharge 5KV 10KV Patch antenna 5KV 10KV VCC 5KV 10KV 3KV 6KV 2KV 4KV EX_ANT UART Others 5.5. Reliability Test Table 15: Reliability Test Test item Condition Standard Thermal shock -30C...+80C, 144 cycles GB/T 2423.22-2002 Test Na IEC 68-2-14 Na Damp heat, cyclic +55C; >90% Rh 6 cycles for 144 hours IEC 68-2-30 Db Test Vibration shock 5~20Hz,0.96m2/s3;20~500Hz,0.96m2/s3-3dB/oct, 1hour/axis; no function 2423.13-1997 Test Fdb IEC 68-2-36 Fdb Test Heat test 85C, 2 hours, Operational GB/T 2423.1-2001 Ab L80_Hardware_Design Confidential / Released 35 / 45 GPS Module L80 Hardware Design IEC 68-2-1 Test Cold test -40C, 2 hours, Operational GB/T 2423.1-2001 Ab IEC 68-2-1 Test Heat soak 90C, 72 hours, Non-Operational GB/T 2423.2-2001 Bb IEC 68-2-2 Test B Cold soak -45C, 72 hours, Non-Operational GB/T 2423.1-2001 A IEC 68-2-1 Test l e t l c a i e t u n Q fide n o C L80_Hardware_Design Confidential / Released 36 / 45 GPS Module L80 Hardware Design 6 Mechanics This chapter describes the mechanical dimensions of the module. 6.1. Mechanical View of the Module l e t l c a i e t u n Q fide n o C Figure 18: Mechanical ViewUnit: mm L80_Hardware_Design Confidential / Released 37 / 45 GPS Module L80 Hardware Design 6.2. Bottom Dimension and Recommended Footprint l e t l c a i e t u n Q fide n o C Figure 19: Bottom DimensionUnit: mm 7 6 12 1 Figure 20: Footprint of RecommendationUnit: mm L80_Hardware_Design Confidential / Released 38 / 45 GPS Module L80 Hardware Design NOTE For easy maintenance, please keep a distance of no less than 3mm between the module and other components in host board. 6.3. Top View of the Module l e t l c a i e t u n Q fide n o C 6 7 L80-M39 12 1 Figure 21: Top View of the Module 6.4. Bottom View of the Module 6 7 1 12 Figure 22: Bottom View of the Module L80_Hardware_Design Confidential / Released 39 / 45 GPS Module L80 Hardware Design 7 Manufacturing 7.1. Assembly and Soldering L80 module is intended for SMT assembly and soldering in a Pb-free reflow process on the top side of the PCB. It is suggested that the minimum height of solder paste stencil is 100um to ensure sufficient solder volume. Pad openings of paste mask can be increased to ensure proper soldering and solder wetting over pads. It is suggested that peak reflow temperature is 235~245C (for SnAg3.0Cu0.5 alloy). Absolute max reflow temperature is 260C. To avoid damage to the module when it is repeatedly heated, it is suggested that the module should be mounted after the first panel has been reflowed. The following picture is the actual diagram which we have operated. 250 217 200 l e t l c a i e t u n Q fide n o C Preheat Heating Cooling Liquids Temperature 200 40s~60s 160 150 70s~120s 100 Between 1~3/S 50 0 50 100 150 200 250 300 s Time(s) Figure 23: Ramp-soak-spike-reflow of Furnace Temperature L80_Hardware_Design Confidential / Released 40 / 45 GPS Module L80 Hardware Design 7.2. Moisture Sensitivity L80 module is sensitivity to moisture absorption. To prevent L80 from permanent damage during reflow soldering, baking before reflow is required in following cases: Humidity indicator card: At least one circular indicator is no longer blue The seal is opened and the module is exposed to excessive humidity. L80 should be baked for 192 hours at temperature 40+5/-0 and <5% RH in low-temperature containers, or 24 hours at temperature 1255 in high-temperature containers. Care should be taken that plastic tray is not heat resistant. L80 should be taken out before preheating, otherwise, the tray maybe damaged by high-temperature heating. l e t l c a i e t u n Q fide n o C 7.3. ESD Safe L80 module is an ESD sensitive device and should be handled carefully. 7.4. Tape and Reel Unit:mm Quantity per reel:250pcs Lengh per reel:6.5m Figure 24: Tape and Reel Specification L80_Hardware_Design Confidential / Released 41 / 45 GPS Module L80 Hardware Design Table 16: Tray Packing Model Name L80 MOQ for MP Minimum Package:250pcs Minimum Package x4=1000pcs 250pcs Size: 370mmx350mmx56mm N.W: 1.5kg G.W: 2.25kg Size: 380mmx250mmx365mm N.W: 6.1kg G.W:9.4kg 7.5. Ordering Information l e t l c a i e t u n Q fide n o C Table 17: Ordering Information Model Name Ordering Code L80 L80-M39 L80_Hardware_Design Confidential / Released 42 / 45 GPS Module L80 Hardware Design 8 Appendix Reference Table 18: Related Documents SN [1] [2] [3] Document name Remark L80_EVB _User Guide L80 EVB User Guide L80_GPS_Protocol_Specification L80 GPS Protocol Specification L80_Reference_Design L80 Reference Design l e t l c a i e t u n Q fide n o C Table 19: Terms and Abbreviations Abbreviation Description AGPS Assisted GPS AIC CEP DGPS EASY EGNOS EPO ESD GPS Active Interference Cancellation Circular Error Probable Differential GPS Embedded Assist System European Geostationary Navigation Overlay Service Extended Prediction Orbit Electrostatic Discharge Global Positioning System GNSS Global Navigation Satellite System GGA GPS Fix Data GLL Geographic Position - Latitude/Longitude GLONASS Global Navigation Satellite System L80_Hardware_Design Confidential / Released 43 / 45 GPS Module L80 Hardware Design GSA GNSS DOP and Active Satellites GSV GNSS Satellites in View HDOP Horizontal Dilution of Precision I/O Input /Output Kbps Kilo Bits Per Second LNA Low Noise Amplifier MSAS MOQ NMEA PDOP PMTK PPS PRN QZSS RHCP RMC SBAS SAW SPDT TTFF UART VDOP l e t l c a i e t u n Q fide n o C Multi-Functional Satellite Augmentation System Minimum Order Quantity National Marine Electronics Association Position Dilution of Precision MTK Proprietary Protocol Pulse Per Second Pseudo Random Noise Code Quasi-Zenith Satellite System Right Hand Circular Polarization Recommended Minimum Specific GNSS Data Satellite-based Augmentation System Surface Acoustic Wave Single-Pole Double-Throw Time To First Fix Universal Asynchronous Receiver & Transmitter Vertical Dilution of Precision VTG Course over Ground and Ground Speed, Horizontal Course and Horizontal Velocity WAAS Wide Area Augmentation System Inom Nominal Current Imax Maximum Load Current L80_Hardware_Design Confidential / Released 44 / 45 GPS Module L80 Hardware Design Vmax Maximum Voltage Value Vnom Nominal Voltage Value Vmin Minimum Voltage Value VIHmax Maximum Input High Level Voltage Value VIHmin Minimum Input High Level Voltage Value VILmax Maximum Input Low Level Voltage Value VILmin VImax VImin VOHmax VOHmin VOLmax VOLmin l e t l c a i e t u n Q fide n o C L80_Hardware_Design Minimum Input Low Level Voltage Value Absolute Maximum Input Voltage Value Absolute Minimum Input Voltage Value Maximum Output High Level Voltage Value Minimum Output High Level Voltage Value Maximum Output Low Level Voltage Value Minimum Output Low Level Voltage Value Confidential / Released 45 / 45