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Quectel L10 Hardware Design

Quectel L10 Hardware Design

Gps engine
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L10
Quectel GPS Engine
Hardware Design
L10_HD_V1.01

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Summary of Contents for Quectel L10

  • Page 1 Quectel GPS Engine Hardware Design L10_HD_V1.01...
  • Page 2 Document Control ID General Notes Quectel offers this information as a service to its customers, to support application and engineering efforts that use the products designed by Quectel. The information provided is based upon requirements specifically provided for Quectel by the customers. Quectel 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

    L10 Hardware Design Contents 0 Revision history ......................6 1 Introduction ....................... 1.1 Related documents ....................... 1.2 Terms and abbreviations....................... 2 Product concept ....................... 2.1 Key features ......................... 2.2 Functional diagram......................2.3 Evaluation board ........................ 2.4 Assisted GPS ........................2.5 Protocol ..........................
  • Page 4 L10 Hardware Design 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 ....................L10_HD_V1.01 - 3 -...
  • Page 5 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.................
  • Page 6 L10 Hardware Design Figure Index FIGURE 1: MODULE FUNCTIONAL DIAGRAM ................11 FIGURE 2: REFERENCE RESET CIRCUIT USING OC CIRCUIT ........... FIGURE 3: REFERENCE RESET CIRCUIT USING BUTTON............FIGURE 4: TIMING OF RESTART SYSTEM ..................FIGURE 5: RTC SUPPLY FROM NON-CHARGEABLE BATTERY OR CAPACITOR....

  • Page 7: Revision History

    L10 Hardware Design 0 Revision history Revision 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.

  • Page 8: Introduction

    This document can help you quickly understand module interface specifications, electrical and mechanical details. With the help of this document and other application notes, you can use L10 module to design and set up your applications quickly.
  • Page 9 L10 Hardware Design Low Noise Amplifier MSAS Multi-Functional Satellite Augmentation System NMEA National Marine Electronics Association Open Mobile Alliance PDOP Position Dilution of Precision PMTK MTK Private Protocol Recommended Minimum Specific GNSS Data RTCM Radio Technical Commission for Maritime Services...

  • Page 10: Product Concept

    SBAS (including WAAS, EGNOS, MSAS), DGPS (RTCM), and AGPS. The L10 is an 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.

  • Page 11: Functional Diagram

    Firmware upgrade over UART port or USB port 2.2 Functional diagram The following figure shows a block diagram of the L10 module. It consists of single chip GPS IC which includes RF part and Baseband part, LNA and SAW filter as well as antenna supervision.

  • Page 12: Evaluation Board

    Figure 1 : Module functional diagram 2.3 Evaluation board In order to help customer on the application of L10 module, Quectel supplies an Evaluation Board (EVB) with appropriate power supply, RS-232 serial cable, USB cable, antenna and the module. For more details, please refer to the document [2].

  • Page 13: Application Interface

    L10 Hardware Design 3 Application interface The module is equipped with a 28-pin 1.1mm pitch SMT pad that connects to the user application platform. Sub-interfaces included in these pads are described in details in the following chapters: Power supply (refer to Chapter 3.3) UART interfaces (refer to Chapter 3.7)
  • Page 14 L10 Hardware Design VIHmin=2.1V VIHmax=2.8V General purpose input/output PIN NAME DESCRIPTION COMMENT CHARACTERISTICS SDA2 I2C interface VILmin=-0.3V If unused keep these pins VILmax=0.8V open. Internally pulled up. SCL2 VIHmin=2.0V EXTINT0 External interrupt If unused keep this pin VIHmax= 3.6V input open.

  • Page 15: Operating Modes

    L10 Hardware Design USB_DP USB data positive specification open. Compatible with USB with 27 Ohms series resistance. RF interface PIN NAME DESCRIPTION COMMENT CHARACTERISTICS RF_IN GPS signal input Impedance of 50Ω Refer to chapter 4 3.2 Operating modes The table below briefly summarizes the various operating modes referred to in the following chapters.
  • Page 16 3.4.1.2 Restart module using the RESET_N pin L10 module can be restarted by driving the RESET_N to low level voltage for a certain time and then releasing it. An open drain driver circuit is suggested in application to control the RESET_N. A simple reference circuit illustrates in Figure 2.

  • Page 17: Turn Off

    L10 Hardware Design Pulldown > 1ms >2.1V RESET_N <0.5V (INPUT) Figure 4: Timing of restart system 3.4.2 Turn off Shutting down the module's power supply is the only way to turn off the system. For more details of this part application, please refer to document [1].
  • Page 18 L10 Hardware Design backed-up memory which contains all the necessary GPS information for quick start-up and a small amount of user configuration variables. Table 7: Pin definition of the V_BCKP pin Name Function V_BCKP Backup voltage supply Note: The VRTC couldn’t keep open. The VRTC pin should be connected to a battery or a capacitor for GPS module hot start and AGPS.

  • Page 19: Uart Interface

    L10 Hardware Design Figure 7 : Seiko XH414H-IV01E charge characteristic 3.7 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 signal (shown as Figure 8).
  • Page 20 L10 Hardware Design M ODULE(DCE) CUSTOM ER(DTE) Serial port TXD1 RXD1 Figure 8 : Connection of serial interfaces This UART port has the following features: UART port can be used for firmware upgrade, inputting or outputting NMEA or PMTK private messages.

  • Page 21: Usb Interface

    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.

  • Page 22: Software Upgrade

    L10 Hardware Design MODULE USB Device connector VDDBUS 3.3V VBUS USBDP USBDM Figure 10: USB interface circuit Note: The USB interface is not recommended to output NMEA message to USB port of the host, such as ARM processor because the driver of USB may be not reliable. If don't use the USB port, please connect VDDUSB to GND.

  • Page 23: I2C Interface

    L10 Hardware Design 3.12 I2C interface The module has a standard I2C interface, but its driver is not embedded in the default firmware. Table 12: Pin definition of the interface Name Function SDA2 I2C data SCL2 I2C clock Note: This interface function is not supported in the default firmware. If customer wants a special firmware, please contact Quectel.

  • Page 24: Antenna Interface And Supervisor

    50 Ohm to connect to RF_IN. 4.1 Antenna The L10 module can be connected to passive or active antenna. In the default operation mode the antenna supervisor 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.

  • Page 25: Antenna Supply

    L10 Hardware Design Table 14: AADET_N and active antenna  Active antenna state AADET_N Description Open-circuit High Active antenna disconnected Active antenna connected The specification of active antenna is listed as Table 15. Table 15: Antenna specification for L10 module  Antenna type Specification Passive antenna Center frequency: 1575.42 MHz Band Width: >20 MHz Gain: >0 dBi...

  • Page 26: Active Antenna

    L10 Hardware Design 4.2.2 Active antenna Active antenna has an integrated low-noise amplifier which could be connected to RF_IN directly. If an active antenna is connected to RF_IN, the integrated low-noise amplifier of the antenna needs to be supplied with the correct voltage through pin V_ANT. Usually, the supply voltage is fed to the antenna through the coaxial RF cable.
  • Page 27 L10 Hardware Design Figure 15: Active antenna with external LDO If an external 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.

  • Page 28: Electrical, Reliability And Radio Characteristics

    L10 Hardware Design 5 Electrical, reliability and radio characteristics 5.1 PIN assignment of the module Table 16: L10 pin assignment PIN NO. PIN NAME PIN NO. PIN NAME SDA2 SCL2 RF_IN TXD1 RXD1 VCC_RF RESERVED V_ANT AADET_N RESERVED VCC_OUT RESERVED...

  • Page 29: Absolute Maximum Ratings

    L10 Hardware Design 5.2 Absolute maximum ratings Absolute maximum rating for power supply and voltage on digital pins of module are listed in Table Table 17: Absolute maximum ratings Parameter Unit Power supply voltage （VCC） -0.3 Backup battery voltage (V_BCKP) -0.3...

  • Page 30: Current Consumption

    L10 Hardware Design voltage drop V_ANT supply V_ANT=3.3V current VDDUSB USB supply voltage VCC_RF Output voltage RF VCC -0.1 section VCC_RF output VCC_RF current Normal Operating ℃ temperature * Use this figure to determine the maximum current capability of power supply.

  • Page 31: Reliability Test

    L10 Hardware Design ℃ Table 20: The ESD endurance table (Temperature: 25 , Humidity: 45 %) Contact discharge Air discharge Antenna port ±5KV ±10KV VCC,GND ±4KV ±8KV Others ±4KV ±8KV 5.6 Reliability test Table 21: Reliability test Test term Condition...

  • Page 32: Mechanics

    L10 Hardware 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 -...
  • Page 33 L10 Hardware Design   （Unit:mm） L10 Bottom dimensions Figure 17: Figure 18: PAD Bottom dimensions（Unit:mm） L10_HD_V1.01 - 32 -...

  • Page 34: Footprint Of Recommendation

    L10 Hardware Design 6.2 Footprint of recommendation L10_HD_V1.01 - 33 -...
  • Page 35 L10 Hardware Design Figure 19: Footprint of recommendation（Unit:mm） ： Note1 Keep out on the host board below the module and the keep-out area 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.

  • Page 36: Top View Of The Module

    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 -...
  • 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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