u-blox LEA-5 Series Hardware Manual Download

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LEA-5, NEO-5, TIM-5H - Hardware Integration Manual

GPS.G5-MS5-09027-A2

Released

Design-in

Page 26 of 68

2.2

LEA-5 design

2.2.1

LEA-5 passive antenna design

This is a minimal setup for a PVT GPS receiver with a LEA-5 module.

USB port

Passive Antenna

Vcc

Micro

Processor

(serial)

(optional)

Backup
Battery
(optional)

Micro

Processor

(USB)

SDA2

SCL2

TxD1

RxD1

NC/VDDIO

VCC

GND

VCC_OUT

CFG_COM1/MISO

/Reserved

RESET_N

V_BCKP

Reserved

GND

RF_IN

VCC_RF

V_ANT/NC

NC/MOSI/CFG_COM0

NC/SS_N/Reserved

NC/SCK/CFG_GPS0

VDDUSB

USB_DM

USB_DP

EXTINT0

TIMEPULSE

GND

AADET_N/SCS1_N
/Reserved

LEA-5

Top View

LDO

Figure 14: Passive antenna design for LEA-5 receivers using USB port

Summary of Contents for LEA-5 Series

Page 1: ...u blox 5 positioning engine These compact easy to integrate stand alone GPS receiver modules combine exceptional GPS performance with highly flexible power design and connectivity options Their compa...

Page 2: ...N 09001 A UBX TN 08027 NEO 5Q NEO 5Q 0 002 ROM5 00 N A NEO 5M NEO 5M 0 001 ROM5 00 N A NEO 5G NEO 5G 0 000 ROM5 00 N A NEO 5D NEO 5D 0 001 ROM5 00 N A TIM 5H TIM 5H 0 004 TIM 5H 0 003 FW6 02 FW6 00 UB...

Page 3: ...dware Integration Manual provides the necessary information to successfully design in and configure these u blox 5 based GPS GALILEO receiver modules For navigating this document please note the follo...

Page 4: ...If you have technical problems or cannot find the required information in the provided documents contact the nearest of the Technical Support offices by email Use our service pool email addresses rath...

Page 5: ...11 1 5 1 UART 11 1 5 2 USB LEA 5 NEO 5 12 1 5 3 DDC LEA 5 NEO 5 13 1 5 4 SPI planned with LEA 5Q and NEO 5Q 5G 17 1 6 I O pins 22 1 6 1 RESET_N LEA 5 TIM 5H 22 1 6 2 EXTINT0 22 1 6 3 AADET_N LEA 5 TI...

Page 6: ...S 5A 5T TIM 5H 42 2 7 EOS ESD EMI Precautions 46 2 7 1 Abbreviations 46 2 7 2 Electrostatic discharge ESD 46 2 7 3 ESD protection measures 46 2 7 4 Electrical Overstress EOS 47 2 7 5 EOS protection me...

Page 7: ...ivity test 57 4 3 1 Guidelines for sensitivity tests 57 4 3 2 Go No go tests for integrated devices 57 Appendix 58 A Migration to u blox 5 receivers 58 A 1 Checklist for migration 58 A 2 Software migr...

Page 8: ...mpact the security or health of the user or third parties or that could cause damage to goods 1 2 Architecture LEA 5 NEO 5 and TIM 5H modules consist of two functional parts he RF and the Baseband sec...

Page 9: ...T_N VCC_RF VCC V_BACKUP GND VCC_OUT UART EXTINT RESET_N SAFEBOOT TIMEPULSE Digital IF Filter Backup RAM ROMCode GPS GALILEO Engine ARM7TDMI S SRAM SAW Filter RTC TIM 5H Block Diagram Figure 1 Block di...

Page 10: ...the RTC and the backup RAM in order to avoid unnecessary battery drain see Figure 2 Power to RTC and BBR is supplied from VCC in this case VCC V_BCKP Voltage Supervisor Module Voltage Supply RTC and...

Page 11: ...ble intervals from one second to one week This can be done by using a hardware interrupt or by sending a serial command The firmware also offers the option to reduce the peak and acquisition current i...

Page 12: ...his is not desired and thus the LDO U1 should be disabled using the enable signal EN of the VCC LDO or the output of a voltage supervisor Depending on the characteristics of the LDO U1 it is recommend...

Page 13: ...d to synchronize data transfers and SDA is the data line Both SCL and SDA lines are o en drain rivers This means that DDC devices can only drive them low or leave them open The pull up resistor Rp pul...

Page 14: ...stablish presence of such a non volatile memory component by writing and reading from a specific location If EEPROM is present assumed to be located at a fixed address 0xA0 the receiver assumes the ro...

Page 15: ...ROM device connected to the bus and used by the host is not detected by the GPS receiver it is important to set the EEPROM s address to a value different than 0xA0 This way EEPROM remains free to be u...

Page 16: ...r is not needed and SCL cannot be pulled low These masters will not work together with other masters as they have no multi master support and may not be used with devices which stretch SCL during tran...

Page 17: ...d two data lines These are identified as follows SCS Slave Chip Select control output from master usually active low SCK Serial Clock control output from master MOSI Master Output Slave Input data out...

Page 18: ...nt slaves SPI allows multiple microcontrollers to be linked together These can be configured according to single or multiple master protocols In the first variant the microcontroller s designated as s...

Page 19: ...and is sampled on the opposite edge where data is stable Edge polarity is determined by the SPI transfer protocol MISO MOSI The MISO and MOSI data pins are used for transmitting and receiving serial...

Page 20: ...VDD MO MOSI SCK SCK VDD Figure 11 Connecting to SPI Master 1 5 4 4 SPI and u blox 5 configuration pins With some u blox 5 modules the SPI MOSI MISO and SCK pins have a shared configuration function at...

Page 21: ...CFG_COM0 MISO CFG_COM1 SCK CFG_GPS0 GND Microprocessor SPI Master SPI Chip Select DATA_OUT_SPI SPI_Clock DATA_IN_SPI A A A Y Y Y OE OE OE CSXN CS2N CS1N Chip_SelectX SPI Slave2 Chip_Select2 SCKX SCK2...

Page 22: ...DET_N LEA 5 TIM 5H AADET_N is an input pin and is used to report whether an external circuit has detected a external antenna or not Low means antenna has been detected High means no external antenna h...

Page 23: ...ce of resistance at Vcc can create significantly longer acquisition times 2 1 1 Layout design in checklist Designing in a u blox 5 module is easy especially when based on a u blox reference design Non...

Page 24: ...or circuitry To optimize performance in environments with out band jamming sources use an additional SAW filter For more information dealing with interference issues see the GPS Antenna Application No...

Page 25: ...pins of the module Connect the antenna to RF_IN over a matching 50 Ohm micro strip and define the antenna supply V_ANT 9 for active antennas internal or external power supply Choose the required seria...

Page 26: ...serial optional Backup Battery optional Micro Processor USB 1 SDA2 SCL2 TxD1 RxD1 NC VDDIO VCC GND VCC_OUT CFG_COM1 MISO Reserved RESET_N V_BCKP Reserved GND GND RF_IN VCC_RF V_ANT NC NC MOSI CFG_COM0...

Page 27: ...open if not used V_BCKP 11 I Backup voltage supply It s recommended to connect a backup battery to V_BCKP in order to enable Warm and Hot Start features on the receivers Otherwise connect to GND or V...

Page 28: ...Table 4 Pin description LEA 5H 5S 5A 5T 2 2 3 Pin description for antenna designs LEA 5Q 5M Function PIN No I O Description Remarks Power VCC 6 I Supply Voltage Provide clean and stable supply GND 7 1...

Page 29: ...O SPI LEA 5Q SPI Chip Select Leave open if not used Planned LEA 5M Leave open MISO CFG_COM1 9 I O SPI Configuration Pin LEA 5Q SPI MISO Leave open if not used Planned LEA 5Q LEA 5M Leave open for def...

Page 30: ...on Remarks Power VCC 23 I Supply Voltage Max allowed ripple on VCC 50mVpp GND 10 12 13 24 I Ground Assure a good GND connection to all GND pins of the module preferably with a large ground plane V_BCK...

Page 31: ...ct to GND to use USB in Self Powered mode See Section 1 6 4 and the NEO 5 Data Sheet 2 NEO 5M 5D11 Leave open if not used NC SS_N 2 I Not Connected SPI Slave Select NEO 5Q 5G Slave select input for SP...

Page 32: ...rnal pull up resistor to VCC Leave open if not used RxD1 4 I Serial Port 1 Serial port input with internal pull up resistor to VCC Leave open if not used Note Don t use an external pull up resistor Rx...

Page 33: ...1 5 mil Figure 18 LEA 5 footprint Stencil 200 m 15 7 mm 618 mil 17 0 mm 669 mil 20 8 mm 819 mil 0 8 mm 31 5 mil 0 6 mm 23 5 mil Figure 19 LEA 5 paste mask 12 2 mm 480 3 mil 16 0 mm 630 mil 1 0 mm 39 3...

Page 34: ...ocesses e g soldering etc of the customer 2 5 2 Placement A very important factor in achieving maximum performance is the placement of the receiver on the PCB The connection to the antenna must be as...

Page 35: ...3 2 1 13 30 Non emitting circuits PCB Digital Analog circuits Non emitting circuits Antenna Digital Part RF Part 17 RF heat emitting circuits PCB Digital Analog circuits RF heat emitting circuits 16 1...

Page 36: ...ata sheet As seen in Figure 25 an isolated ground area is created around and below the RF connection This part of the circuit MUST be kept as far from potential noise sources as possible Make certain...

Page 37: ...13 30 Antenna 16 17 18 19 20 21 22 23 24 25 26 27 28 29 15 14 12 11 10 9 8 7 6 5 4 3 2 1 13 30 PCB PCB PCB Wrong better best Figure 27 Recommended micro strip routing to RF pin for exact pin orientati...

Page 38: ...hickness and a 35 m 1 ounce copper cladding The thickness of the micro strip is comprised of the cladding 35 m plus the plated copper typically 25 m Figure 29 is an example of a multi layer FR4 board...

Page 39: ...e antennas have an integrated low noise amplifier They can be directly connected to RF_IN If an active antenna is connected to RF_IN the integrated low noise amplifier of the antenna needs to be suppl...

Page 40: ...ends using an inductor from Murata LQG15HS27NJ02 Alternative parts can be used if the inductor s resonant frequency matches the GPS frequency of 1575 4MHz Low Noise Amplifier Active Antenna RF_IN VCC_...

Page 41: ...ts to feed pin V_ANT An internal switch under control of the u blox 5 software can shut down the supply to the external antenna whenever it is not needed This feature helps to reduce power consumption...

Page 42: ...led the active antenna supervisor produces serial port messages status reporting in NMEA and or UBX binary protocol which indicates all changes of the antenna circuitry disabled antenna supervisor ant...

Page 43: ...ply voltage will be immediately shut down Antenna short detection SCD and control is enabled by default Open Circuit Detection OCD R1 R2 R3 u blox 5 Module GND RF_IN GND V_ANT VCC_RF AADET_N u1 Figure...

Page 44: ...R min 10 V FB1 600 Ferrite Bead e g Murata BLM18HD601SN1 R1 15 10 Resistor min 0 063 W R2 10 10 Resistor min 0 250 W R3 R4 10 k 10 Resistor min 0 063 W R5 33 k 10 Resistor min 0 063 W T1 T2 PNP Transi...

Page 45: ...iption including Protocol Specification 2 Similar to the antenna supervisor configuration the status of the antenna supervisor will be reported in a NMEA GPTXT or UBX INF NOTICE message at start up an...

Page 46: ...dards Institute CDMA Code Division Multiple Access EMC Electromagnetic compatibility EMI Electromagnetic interference EOS Electrical Overstress EPA Electrostatic Protective Area ESD Electrostatic disc...

Page 47: ...amaged by ESD or EOS 2 7 5 EOS protection measures EOS protection measures as shown in Figure 39 are recommended for any designs combining wireless communication transceivers e g GSM GPRS and GPS in t...

Page 48: ...r pin Example of EMI protection measures on the RX TX line using a ferrite bead TX RX GPS Receiver FB FB BLM15HD102SN1 10mm Figure 40 EMI Precautions VCC can be protected using a feed thru capacitor F...

Page 49: ...cement of the GPS antenna Adding a CDMA GSM WCDMA bandbass filter before handset antenna 2 7 7 4 Out band jamming Out band jamming is caused by signal frequencies that are different from the GPS carri...

Page 50: ...5 1 35x1 05x0 5 mm 2 7 5 2 5x2 0x1 0 mm Low loss RF filter for GPS Unbalanced to unbalanced operation Insertion Loss Bandwith and BW over te emperature Electrostatic Sensitive Device ESD MM CTS CER00...

Page 51: ...ican National Standards Institute ANSI GPS receivers are sensitive to ESD and require special precautions when handling Particular care must be exercised when handling patch antennas due to the risk o...

Page 52: ...idelines for temperature profiling for mass soldering reflow and wave processes published 2001 Preheat phase Initial heating of component leads and balls Residual humidity will be dried out Please not...

Page 53: ...ection After soldering the u blox 5 module consider an optical inspection step to check whether The module is properly aligned and centered over the pads All pads are properly soldered No excess solde...

Page 54: ...the pads Start with a cross diagonal fixture soldering e g pins 1 and 15 and then continue from left to right 3 3 8 Rework The u blox 5 module can be unsoldered from the baseboard using a hot air gun...

Page 55: ...uld be sufficient to provide optimum immunity to interferences and noise u blox makes no warranty for damages to the u blox 5 module caused by soldering metal cables or any other forms of metal strips...

Page 56: ...livers a detailed test report for each unit The following measurements are done Digital self test Software Download verification of FLASH firmware etc Measurement of voltages and currents Measurement...

Page 57: ...ator to the OEM product 2 Choose the power level in a way that the Golden Device would report a C No ratio of 38 40 dBHz 3 Power up the DUT Device Under Test and allow enough time for the acquisition...

Page 58: ...ugh all u blox 5 receivers outperform ANTARIS 4 acquisition i e better sensitivity level and acquisition time select a TIM 5H LEA 5H LEA 5S LEA 5Q NEO 5Q or NEO 5G for the advantage of KickStart perfo...

Page 59: ...EA 5H LEA 5T LEA 5Q NEO 5G NEO 5Q and TIM 5H operate in Max Performance mode by default Standard u blox5 modules NEO 5D NEO 5M LEA 5A and LEA 5M are set to Eco mode by default NEO 5G NEO 5Q and LEA 5Q...

Page 60: ...utomotive platform which is better geared to the dynamics of land vehicles but is only of limited use in airborne and high dynamics environments UBX CFG NAV5 does not support following features Almana...

Page 61: ...website A 3 Hardware Migration u blox 5 modules have been designed with backward compatibility in mind but some minor differences were unavoidable These minor differences will however not be relevant...

Page 62: ...eserved NC NC NC 24 VDDUSB Connected to GND or VDD_USB VDDUSB Connected to GND or VDD_USB Do not leave open VDD_USB is 3 3V regulated power supply from VBUS 25 USB_DM NC USB_DM NC No difference 26 USB...

Page 63: ...VCC 1V VCC_RF VCC 1V No difference 19 V_ANT 3 0V 0V V_ANT 2 7V 5 5V No difference 20 AADET_N NC 1 8 to 5 0V AADET_N NC 21 GPSMODE5 NC GND or VDD18OUT NC NC 22 GPSMODE2 GPSMODE2 3 NC GND or VDD18OUT N...

Page 64: ...and 9 must be connected 9 VCC_RF VCC 0 1V VCC_RF VCC 0 1V No difference 10 GND GND GND GND No difference 11 RF_IN RF_IN RF_IN RF_IN No difference 12 GND GND GND GND No difference 13 GND GND GND GND N...

Page 65: ...VDD18OUT NC VCC_OUT NC Internally connected to VCC if you have circuitry connected to this pin check if it withstands the VCC voltage 11 to 16 GND GND GND GND No difference 17 RF_IN RF_IN RF_IN RF_IN...

Page 66: ...erved NC 8 9 EXTINT1 GPSMODE3 NC EXTINT1 NC Reserved NC 9 10 VDD18OUT NC VDD18OUT NC VCC_OUT NC 10 11 to 16 GND GND GND GND GND GND 11 to 16 17 RF_IN RF_IN RF_IN RF_IN RF_IN RF_IN 17 18 GND GND GND GN...

Page 67: ...u No GPS X 08014 All these documents are available on our homepage http www u blox com For regular updates to u blox documentation and to receive product change notifications please register on our ho...

Page 68: ...rica u blox AG Phone 41 44 722 74 44 E mail info u blox com Technical Support Phone 41 44 722 74 44 E mail support u blox com Asia Australia Pacific u blox Singapore Pte Ltd Phone 65 6734 3811 E mail...

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