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Quectel L10, Hardware Design

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L10 Hardware Design                                                                                                                           

 

 

Figure 9: RS-232 level shift circuit 

3.8 USB interface 

The USB (Universal Serial Bus) port makes the GPS receiver capable of significantly improving data 
transmission and receiving rate. It is USB 2.0 Full-Speed compatible. This interface is automatically 
converted to COM port to HOST operating systems and its driver could operate on Windows 98, 2000, 
XP, and Vista operation system. Customer can update firmware through this port. 

The USB port can be used for firmware update, inputting or outputting NMEA or PMTK private 
messages. It is the same function as serial port. 

 

Plug-and-Play feature provides easier way for customer’s data communication with most navigation 
software. Moreover, flexibility of applications for different USB classes is available. 

Table 9: Pin definition of USB interface 

Interface 

Name 

Pin 

Function 

VDDUSB 

24 

USB power supply 

USB_DM 25  USB 

data- 

USB Port 

USB_DP 26  USB 

data+ 

 
In order to comply with USB specifications, VDDUSB must be connected to an LDO as shown in 
Figure 10 when the USB port is used. For more details please refer to document [1]. 
 

L10_HD_V1.01        

                                                                                                     

                   

- 20 -   

 

   Quectel  

Confidential

Summary of Contents for L10

Page 1: ...L10 Quectel GPS Engine Hardware Design L10_HD_V1 01 ...

Page 2: ...tion of this product designed by Quectel within a larger electronic system remains the responsibility of the customer or the customer s system integrator All specifications supplied herein are subject to change Copyright This document contains proprietary technical information which is the property of Quectel Limited copying of this document and giving it to others and the using or communication o...

Page 3: ...upply 3 4 Turn on and Turn off 3 4 1 Turn on 3 4 2 Turn off 3 5 Power saving 3 5 1 Enter standby mode 3 5 2 Exit from standby mode 3 6 RTC backup 3 7 UART interface 3 8 USB interface 3 9 Software upgrade 3 10 EXTINT0 3 11 AOK 3 12 I2C interface 4 Antenna interface and supervisor 4 1 Antenna 4 2 Antenna supply 4 2 1 Passive antenna 4 2 2 Active antenna 5 Electrical reliability and radio characteris...

Page 4: ...L10 Hardware Design L10_HD_V1 01 3 31 33 35 35 6 1 Mechanical dimensions of the module 6 2 Footprint of recommendation 6 3 Top view of the module 6 4 Bottom view of the module Quectel Confidential ...

Page 5: ...S TABLE 9 PIN DEFINITION OF USB INTERFACE TABLE 10 PIN DEFINITION OF THE EXTINT0 TABLE 11 PIN DEFINITION OF THE AOK TABLE 12 PIN DEFINITION OF THE I2C INTERFACE TABLE 13 PIN DEFINITION OF THE AADET_N TABLE 14 AADET_N AND ACTIVE ANTENNA TABLE 15 ANTENNA SPECIFICATION FOR L10 MODULE TABLE 16 L10 PIN ASSIGNMENT TABLE 17 ABSOLUTE MAXIMUM RATINGS TABLE 18 THE MODULE POWER SUPPLY RATINGS TABLE 19 THE MO...

Page 6: ...R CAPACITOR FIGURE 6 REFERENCE CHARGING CIRCUIT FOR CHARGEABLE BATTERY FIGURE 7 SEIKO XH414H IV01E CHARGE CHARACTERISTIC FIGURE 8 CONNECTION OF SERIAL INTERFACES FIGURE 9 RS 232 LEVEL SHIFT CIRCUIT FIGURE 10 USB INTERFACE CIRCUIT FIGURE 11 EXTERNAL DETECT CIRCUIT FOR OPEN CIRCUIT OF ACTIVE ANTENNA FIGURE 12 REFERENCE DESIGN FOR PASSIVE ANTENNA FIGURE 13 ACTIVE ANTENNA BIASING FIGURE 14 ACTIVE ANTE...

Page 7: ...on Date Author Description of change 1 00 2009 07 05 Yong AN Samuel HONG Initial 1 01 2009 11 16 Yong AN Samuel HONG 1 Add NMEA message type of module output in default 2 Add descriptions about relation between USB interface and standby mode Quectel Confidential ...

Page 8: ..._HD_AN L10 Hardware Design Application Notes 2 L10_EVB _UGD L10 EVB User Guide 3 L10_GPS_Protocol L10 GPS Protocol Specification 1 2 Terms and abbreviations Table 2 Terms and abbreviations Abbreviation Description BEE Broadcast Ephemeris Extension EMC Electromagnetic Compatibility ESD Electrostatic Discharge EPO Extended Prediction Orbit EGNOS European Geostationary Navigation Overlay Service GPS ...

Page 9: ...urse over Ground and Ground Speed Horizontal Course and Horizontal Velocity WAAS Wide Area Augmentation System ZDA Time Date Inorm Normal Current Imax Maximum Load Current Vmax Maximum Voltage Value Vnorm Normal 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 Min...

Page 10: ...n SMD type module with the compact 22 4mm x 17 0mm x 3 0 mm form factor which can be embedded in customer applications through the 28 pin pads It provides all hardware interfaces between the module and customer s board z The UART port can help to develop customer s application easily z The USB port is available for faster data transmission and more flexibility z The antenna interface supports pass...

Page 11: ...RT Port is used for NMEA outputting or inputting PMTK private messages inputting and firmware upgrade USB Port z Support USB 2 0 full speed compatible z USB Port is used for NMEA outputting or inputting PMTK private messages inputting and firmware upgrade Temperature range z Normal operation 40 C 85 C z Storage temperature 45 C 125 C Physical Characteristics Size 22 4 0 15 x 17 0 15 x 3 0 0 1mm We...

Page 12: ...ails please refer to the document 2 2 4 Assisted GPS Supply aiding information like ephemeris almanac rough last position and time and satellite status and improve the acquisition sensitivity The L10 module supports the EPO BEE A GPS services and OMA SUPL compliant 2 5 Protocol The module supports standard NMEA 0813 protocol and MTK private protocol PMTK messages that can be used to provide extend...

Page 13: ...m 3 3V Supply current for no less than 150mA V_BCKP I Backup voltage supply Vmax 4 3V Vmin 2 0V Vnorm 3 3V Iin 4uA Power supply for RTC when VCC is not applied for the system VCC_OUT O Output voltage Vmax 4 3V Vmin 3 0V Vnorm 3 3V Imax 20mA If unused keep this pin open This pin is internally connected to VCC VCC_RF O Output voltage RF section Vmax 4 3V Vmin 3 0V Vnorm 3 3V Imax 50mA If unused keep...

Page 14: ...x 0 4V VOHmin 2 4V VOHmax 2 9V If unused keep this pin open Internally pulled down TIMEPULSE O Time pulse VOLmin 0 3V VOLmax 0 4V VOHmin 2 4V VOHmax 2 9V 1 pulse per second 1PPS Synchronized at rising edge pulse length 100ms If unused keep this pin open UART port PIN NAME I O DESCRIPTION DC CHARACTERISTICS COMMENT RXD1 I Receive data TXD1 O Transmit data VILmin 0 3V VILmax 0 8V VIHmin 2 0V VIHmax ...

Page 15: ...ta from the specific satellites Standby mode EXTINT0 pin can be used to make the module enter into standby mode In this case the UART port and USB port are not accessible and the current consumption of the module is also minimal The module could be woken up by EXTINT0 pin 3 3 Power supply The main power supply is fed through the VCC pin It is important that the system power supply circuitry is abl...

Page 16: ...pen drain driver circuit is suggested in application to control the RESET_N A simple reference circuit illustrates in Figure 2 4 7K 47K RESET_N Input pulse Figure 2 Reference reset circuit using OC circuit The other way to control the RESET_N is using a button directly A TVS component needs to be placed nearby the button for ESD protection While pressing the key ESD strike may generate from finger...

Page 17: ...to low the module will enter the standby mode In this case the UART port and the USB port are not accessible and the current consumption of the module is also minimal Note When USB interface of the module is being used the module could not enter standby mode 3 5 2 Exit from standby mode When the EXTINT0 pin is changed from low to high the module will exit from the standby mode 3 6 RTC backup The R...

Page 18: ...the following figure for RTC backup RTC LDO MODULE V_BCKP Non chargeable battery or capacitor Figure 5 RTC supply from non chargeable battery or capacitor The V_BCKP pin does not implement charging for rechargeable battery It is necessary to add a charging circuit for rechargeable battery shown as the following figure Charge Circuit VCC RTC LDO 100R MODULE V_BCKP chargeable Backup Battery Figure 6...

Page 19: ... DTE Data Terminal Equipment connection The module and the client DTE are connected through the following signal shown as Figure 8 It supports data baud rate from 4800bps to 115200bps UART port z TXD1 Send data to the RXD signal line of DTE z RXD1 Receive data from the TXD signal line of DTE Table 8 Pin definition of the UART interfaces Interface Name Pin Function TXD1 3 Transmitting data UART Por...

Page 20: ...800 38400 57600 115200 The default setting is 9600bps 8 bits no parity bit 1 stop bit no hardware flow control z Hardware flow control and synchronous operation are not supported Note It is strongly recommended that the UART port is used to output NMEA message to serial port of host in design The UART port does not support the RS 232 level but only supports the LVTTL level If the module s UART por...

Page 21: ...t can be used for firmware update inputting or outputting NMEA or PMTK private messages It is the same function as serial port Plug and Play feature provides easier way for customer s data communication with most navigation software Moreover flexibility of applications for different USB classes is available Table 9 Pin definition of USB interface Interface Name Pin Function VDDUSB 24 USB power sup...

Page 22: ...dge trigger interrupt and can be used to wake up the module from the standby mode When the EXTINT0 pin is changed from high to low the module will enter the standby mode When the EXTINT0 pin is changed from low to high the module will exit from standby mode Table 10 Pin definition of the EXTINT0 Name Pin Function EXTINT0 27 External interrupt input 3 11 AOK AOK can output antenna status message It...

Page 23: ...not embedded in the default firmware Table 12 Pin definition of the I2C interface Name Pin Function SDA2 1 I2C data SCL2 2 I2C clock Note This interface function is not supported in the default firmware If customer wants a special firmware please contact Quectel L10_HD_V1 01 22 Quectel Confidential ...

Page 24: ...is activated and enables the receiver to detect short circuit at the antenna port by checking the bias voltage level and can shut down the voltage bias immediately when short circuit happens NMEA messages are provided to report the condition of the antenna supply Open circuit detection can also be supported with an additional external circuit The reference design of the external circuit is shown i...

Page 25: ...P or Linear Active antenna Center frequency 1575 42 MHz Band Width 5 MHz Minimum gain 15 20dB compensate signal loss in RF cable Maximum noise figure 1 5dB Maximum gain 50dB Polarization RHCP or Linear 4 2 Antenna supply 4 2 1 Passive antenna Passive antenna doesn t require a DC bias voltage and can be connected to RF_IN pin directly V_ANT can be connected to GND It is always beneficial to reserve...

Page 26: ...ive antenna is shown in Figure 13 Figure 13 Active antenna biasing If the active antenna is short circuited the module would turn off the power supply to the antenna immediately Afterwards the antenna status will be detected every 60 seconds When the short circuit problem is removed it will recover the power supply to the active antenna If the VCC_RF voltage is suitable for powering the active ant...

Page 27: ...xternal power supply and an external inductor are used to power the active antenna the short circuit detection function could still work but it couldn t cut off the external power supply So customer is not recommended to do in this way L10_HD_V1 01 26 Quectel Confidential ...

Page 28: ...O PIN NAME I O 1 SDA2 I O 15 GND 2 SCL2 O 16 RF_IN I 3 TXD1 O 17 GND 4 RXD1 I 18 VCC_RF O 5 RESERVED 19 V_ANT I 6 VCC I 20 AADET_N I 7 GND 21 RESERVED 8 VCC_OUT O 22 RESERVED 9 RESERVED 23 RESERVED 10 RESET_N I 24 VDDUSB I 11 V_BCKP I 25 USB_DM I O 12 AOK O 26 USB_DP I O 13 GND 27 EXTINT0 I 14 GND 28 TIMEPULSE O Note Please keep all reserved pins open Quectel Confidential ...

Page 29: ...gs 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 5 3 Operating conditions Table 18 The module power supply ratings Parameter...

Page 30: ...rent consumption passive antenna Parameter Condition Min Typ Max Unit Icc Acquisition 43 mA Icc Tracking For Cold Start 10 minutes after First Fix For Hot Start 15 seconds after First Fix 38 mA Icc Standby EXTINT0 pin is changed from high to low 2 mA Note In the standby mode the power supply to active antenna through V_ANT is cut off It will be re activated when the module exits from the standby m...

Page 31: ...p heat cyclic 55 C 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 85 C 2 hours Operational GB T 2423 1 2001 Ab IEC 68 2 1 Test Cold test 40 C 2 hours Operational GB T 2423 1 2001 Ab IEC 68 2 1 Test Heat soak 90 C 72 hours Non Operational GB T 2423 2 2001 Bb IEC ...

Page 32: ...re Design 6 Mechanics This chapter describes the mechanical dimensions of the module 6 1 Mechanical dimensions of the module Figure 16 L10 Top view and Side dimensions Unit mm L10_HD_V1 01 31 Quectel Confidential ...

Page 33: ...L10 Hardware Design Figure 17 L10 Bottom dimensions Unit mm Figure 18 PAD Bottom dimensions Unit mm L10_HD_V1 01 32 Quectel Confidential ...

Page 34: ...L10 Hardware Design 6 2 Footprint of recommendation L10_HD_V1 01 33 Quectel Confidential ...

Page 35: ... should be covered by solder mask and top silk layer for isolation between the top layer of host board and the bottom layer of the module Note2 For easy maintenance of this module and accessing to these pads please keep a distance no less than 3mm between the module and other components in host board L10_HD_V1 01 34 Quectel Confidential ...

Page 36: ...L10 Hardware Design 6 3 Top view of the module Figure 20 Top view of the module 6 4 Bottom view of the module Figure 21 Bottom view of the module L10_HD_V1 01 35 Quectel Confidential ...

Page 37: ...Shanghai Quectel Wireless Solutions Co Ltd Room 801 Building E No 1618 Yishan Road Shanghai China 201103 Tel 86 21 5108 2965 Mail info quectel com ...

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