!!
your position is our focus!
Abstract
Technical!description!of!the!low-cost!ANTARIS!4!GPS!Module!with
USB! interface,! integrated! in! the!17!x!22.4!mm!housing,! and! for
use!with!passive!and!active!antennas.!
!
u-blox AG
Zürcherstrasse!68!
8800!Thalwil!
Switzerland!
www.u-blox.com!
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Phone!+41!1722!7444!
Fax!+41!1722!7447!
info@u-blox.com!
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LEA-4A
GPS Receiver Module
Data Sheet
PRELIMINARY!
!
D
at
a
Sh
ee
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LEA-4A!-!Data!Sheet! PRELIMINARY! !
GPS.G4-MS4-05017-P2! ! Page 2!
your position is our focus
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Title LEA-4A!
Subtitle GPS!Receiver!Module!
Doc Type Data!Sheet! PRELIMINARY!
Doc Id GPS.G4-MS4-05017-P2!
Revision
Index Date Name Status / Comments
P1! 31.!Oct!2005! GzB! Preliminary!release!
P2! 21.!Dec!2005! GzB! Modified:!Sections!1.2,!1.3,!1.5,!2,!3.3!(RESET_N),!4.2!(Vant)!
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We!reserve!all!rights!in!this!document!and!in!the!information!contained!therein.!Reproduction,!use!or!disclosure!to!third!parties!without!express!authority!is!strictly!forbidden.!
For!most!recent!documents,!please!visit!www.u-blox.com!
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Data Sheet
Revisions
Identification of applicable hardware Comments
P1,!P2! All!data!codes! !
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The!specifications!in!this!document!are!subject!to!change!at!u-blox'!discretion.!u-blox!assumes!no!responsibility!for!any!claims!or!damages!
arising!out!of!the!use!of!this!document,!or!from!the!use!of!modules!based!on!this!document,!including!but!not!limited!to!claims!or!damages!
based!on! infringement!of!patents,!copyrights!or!other! intellectual!property!rights.!u-blox!makes!no!warranties,!either!expressed!or! implied!
with!respect!to!the!information!and!specifications!contained!in!this!document.!u-blox!does!not!support!any!applications!in!connection!with!
active!weapon!systems,!ammunition,!life!support!and!commercial!aircraft.!Performance!characteristics!listed!in!this!document!are!estimates!
only!and!do!not!constitute!a!warranty!or!guarantee!of!product!performance.!
!
The! copying,! distribution! and! utilization! of! this! document! as!well! as! the! communication! of! its! contents! to! others!without! expressed!
authorization!is!prohibited.!!Offenders!will!be!held!liable!for!the!payment!of!damages.!!All!rights!reserved,!in!particular!the!right!to!carry!out!
patent,!utility!model!and!ornamental!design!registrations.!
!
u-blox,!the!u-blox!logo,!the!TIM!type!GPS!module,!Antaris,!SuperSense,!"your!position!is!our!focus",!NavLox,!u-center,!FixNow!and!EKF!are!
(registered)!trademarks!of!u-blox!AG.!The!u-blox!software!as!well!as!the!design!of!the!LEA!type!modules!is!protected!by!intellectual!property!
rights!in!Switzerland!and!abroad.!!Further!information!available!at!info@u-blox.com.!!Copyright!©!2005,!u-blox!AG!
!
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LEA-4A!-!Data!Sheet! PRELIMINARY! Contents!
GPS.G4-MS4-05017-P2! ! Page 3!
your position is our focus
Contents
1 Functional Description .................................................................................................4
1.1 Overview .............................................................................................................................................. 4
1.2 Block!Diagram ...................................................................................................................................... 4
1.3 Features................................................................................................................................................ 4
1.4 Operating!Modes.................................................................................................................................. 5
1.5 Protocols .............................................................................................................................................. 5
1.6 Assisted!GPS!(A-GPS) ............................................................................................................................ 5
1.7 Boot-Time!GPSMODE!Configuration..................................................................................................... 5
1.8 Antenna ............................................................................................................................................... 6
2 Performance Specification ...........................................................................................7
3 Mechanical Specification .............................................................................................8
3.1 Dimensions........................................................................................................................................... 8
3.2 Specification ......................................................................................................................................... 8
3.3 Pin!Assignment..................................................................................................................................... 9
4 Electrical Specification ...............................................................................................10
4.1 Absolute!Maximum!Ratings ................................................................................................................ 10
4.2 Operating!Conditions ......................................................................................................................... 11
5 Environmental Specification......................................................................................12
6 Product Lineup ...........................................................................................................13
6.1 Default!Settings .................................................................................................................................. 13
6.2 Ordering!Information.......................................................................................................................... 13
!
LEA-4A!-!Data!Sheet! PRELIMINARY! Functional Description!
GPS.G4-MS4-05017-P2! ! Page 4!
your position is our focus
1 Functional Description
1.1 Overview
The!LEA-4A! is!a! low-cost!GPS!module! featuring! the!new!u-blox!16-channel!ANTARIS!4! receiver! technology.! It!
provides!high!performance!at!35%!less!power!consumption!and!features!a!newly!added!USB!port!for!faster!data!
transmission!and!more!flexibility.!The!ANTARIS!4!GPS!engine!inside!offers!outstanding!navigation!performance!in!
the!most!challenging!metropolitan!areas.!
The!LEA-LA!successor!also!shares! the!LEA-LAs!17!x!22.4! form! factor! initially!created!by!u-blox.! Its!small! form!
factor!and!SMT!pads!allow!for!fully!automatic!assembly!processes!with!standard!pick-and-place!equipment!and!
reflow!soldering,!enabling!cost-efficient,!high-volume!production.!The!combination!of!these!features!makes!this!
module!suitable!for!a!broad!spectrum!of!GPS!products!whose!key!requirements! include!high!performance,!low!
cost,!low!power!consumption!and!small!size.!
1.2 Block Diagram
ATR0601
ATR0622
ATR0610
ARM7TDMI
CPU
SRAM
128 kB
[32 Bit]
ROM
384 kB
[32 Bit]
Correlator
16 channels
VCC
LDO
23.104 MHz
I/O
XTO
TxD2
TxD1
RxD1
VDDIO
VCC
GND
VDD18OUT
GPSMODE6
RESET_N
V_BAT
BOOT_INT
GNDGND
RF_IN
GND
V_ANT
VCC_RF
GPSMODE5
GPSMODE2
GPSMODE7
USB_DM
USB_DP
VDDUSB
EXTINT0
TIMEPULSE
4
3
7
9
14
28
27
26
25
24
24
22
21
18
19
17
16
15
RF_ON SLEEP_N
SAW-Filter
A
D
UART, I/O
ANT_SHORT_NANT_ON
Timer /
Counter
RESET USARTs
I/O
Controller
USB
1
2 RxD2
5
6
8
10
11
12
GND13
D
ig
ita
l I
F
&
C
lo
ck
USB
20AADET_N
Low Noise Amplifier RF Front-End
Baseband Processor
32.768 kHz
VBAT
LDO
RTC
Backup RAM
4 kB
[32 Bit]
!
Figure 1: Block Diagram
1.3 Features
• 34!mA!supply!current!at!Vcc!=!2.7!V!
(Power!reduction!by!more!than!35%!compared!to!
predecessor!modules)!
• USB!connectivity!
• Same!functionality!in!40%!smaller!footprint!
• Significantly!lower!battery!backup!current!!
• Configurable!I/O!and!UART!voltage!levels!
• RoHS!compliant!(lead-free)!
• 16!channel!ANTARIS!4!positioning!engine!
• 4!Hz!position!update!rate!
• Assisted!GPS!(MS-Assisted,!MS-Based)!
• DGPS!and!full!SBAS!(WAAS,!EGNOS)!support!
• FixNOW!power!saving!mode!
• 4!Boot!time!configuration!pins!
• Supports!passive!and!active!antennas!
• Antenna!short!and!open!circuit!detection!and!
protection!
• Operating!temperature!range:!40!to!85°C!
!
LEA-4A!-!Data!Sheet! PRELIMINARY! Functional Description!
GPS.G4-MS4-05017-P2! ! Page 5!
your position is our focus
1.4 Operating Modes
The!ANTARIS!4!GPS!Technology!supports!following!Operating!Modes:!
Operating Modes Description
Continuous Tracking Mode (CTM) The!Continuous!Tracking!Mode!is!the!default!mode!for!normal!GPS!
operation.!!In!this!mode,!the!Autonomous!Power!Management!
(APM)!will!automatically!optimize!power!consumption!transparently!
to!the!use!where!parts!of!the!receiver!are!switched!off!when!not!
required.!!Also,!the!CPU!speed!is!reduced!when!the!CPU!workload!is!
low.!
FixNOW™ Mode (FXN) FixNOW!Mode!is!a!configurable!power!saving!mode!where!the!
GPS!is!put!into!sleep!mode!and!activated!up!on!a!selectable!time!
interval!or!upon!external!request!(signal!activity!on!serial!port!or!
EXTINT!input).!!This!mode!is!ideally!suited!in!applications!with!
stringent!power!budget!requirements!in!mobile!and!battery!
operated!end!products.!
Table 1: Operating Modes
For!more!information!see!the!System Integration Manual for ANTARIS 4![1].!
1.5 Protocols
The!LEA-4A!supports!different!serial!protocols.!
Protocol Type Runs on
NMEA! Input/output,!ASCII,!0183,!2.3!(compatible!to!3.0)! All!serial!ports!and!USB!
UBX! Input/output,!binary,!u-blox!proprietary! All!serial!ports!and!USB!
RTCM! Input,!message!1,2,3,9! All!serial!ports!and!USB!
Table 2: Available Protocols
For!specification!of!the!various!protocols!see!the!Protocol Specification![2].!
1.6 Assisted GPS (A-GPS)
The! ANTARIS! 4! GPS! engine! supports! both! MS! assisted! (output! of! raw! tracking! information! for! position!
computation!by!the!service!provider)!and!MS!based!(accelerated!acquisition!and!position!computation!in!the!GPS!
receiver)!A-GPS.!!Supply!of!aiding!information!like!ephemeris,!almanac,!rough!last!position!and!time!and!satellite!
status!and!an!optional!time!synchronization!signal!will!reduce!time!to!first!fix!significantly.!
1.7 Boot-Time GPSMODE Configuration
The!LEA-4A!provides!four!GPSMODE!pins!for!boot-time!configuration.!!They!become!effective!immediately!after!
start-up.! !Once! the! LEA-4A! has! started,! the! configuration! settings!may! be!modified!with!UBX! configuration!
messages.!!The!modified!settings!remain!effective!until!power-down!or!reset.!!If!these!settings!have!been!stored!
in! battery-backup! RAM! (with!CFG-CFG!message),! then! the!modified! configuration!will! be! retained,! as! long!
backup!battery!supply!is!not!interrupted.!
!
!
LEA-4A!-!Data!Sheet! PRELIMINARY! Functional Description!
GPS.G4-MS4-05017-P2! ! Page 6!
your position is our focus
GPSMODE GPSMODE
2 GPS sensitivity settings 8 USB power settings
0! Normal!sensitivity!mode! ! 0! Bus-Powered!USB!Interface!
1 High sensitivity mode 1 Self-Powered USB Interface
The!other!sensitivity!settings!can!be!enabled!with!configuration!messages.!
!
GPSMODE Activated Message Set Serial Port 1 and USB Serial Port 2
6 5 See Table 4 Baud Rate Protocol Baud Rate Protocol
0! 0! High! 19.2!Kbaud! NMEA! 57.6!Kbaud! UBX!
0! 1! Low! 4.8!Kbaud! NMEA! 19.2!Kbaud! UBX!
1 0 Medium (default) 9.6 Kbaud NMEA 38.4 Kbaud UBX
1! 1! Extended! 115.2!Kbaud! UBX! 19.2!Kbaud! NMA!
Table 3: Supported GPSMODE settings (Default settings apply if not connected and are boldfaced)
Protocol Low Medium
(additional!messages)
Extended
(additional!messages)
UBX NAV-SOL!
NAV-SVINFO!
UBX-INF!
+!NAV-POSECEF,!NAV-POSLLH,!NAV-STATUS,!
NAV-DOP,!NAV-VELECEF,!NAV-VELNED,!NAV-
TIMEGPS,!NAV-TIMEUTC,!NAV-CLOCK!
+!MON-SCHD,!MON-IO,!MON-IPC!
RXM-RAW!(RXM_RAW:!only!if!raw!data!
tracking!is!activated)!
NMEA GGA,!RMC,!TXT! +!GSA,!GSV,!GLL,!VTG,!ZDA! +!PUBX00,!PUBX03,!PUBX04!
Table 4: Message Sets
For!more!information!see!the!System Integration Manual for ANTARIS 4![1].!
1.8 Antenna
This!GPS!receiver! is!designed!for!use!with!passive!and!active!antennas.! !An!antenna!supervisor! is!provided.! ! If!
activated,! the!GPS! receiver! is! capable! of! detecting! short! circuits! to! the! active! antenna! by! checking! the! bias!
voltage!level!and!can!shut!down!the!voltage!bias!immediately.!!A!series!resistor!is!needed!in!front!of!the!V_ANT!
input.! !UBX! and!NMEA!messages! are!provided! to! report! the! condition! of! the! antenna! supply.! !Open! circuit!
detection! can! also! be! supported!with! an! additional! external! circuit.! ! For! details,! please! refer! to! the! System
Integration Manual for ANTARIS 4![1].!
!
Parameter Specification
Antenna!Type! ! Passive!and!active!antenna!
Active!Antenna!
Recommendations!
Minimum!gain!
Maximum!noise!figure!
Maximum!gain!
10!-!15!dB!(to!compensate!signal!loss!in!RF!cable)!
1.5!dB!
50!dB!
Antenna!Supply! ! Using!VCC_RF!or!external!voltage!source!
Antenna!Supervisor! Short!circuit!detection!
Open!circuit!detection!
Built-in!
Enabled!with!external!circuit!
Table 5: Antenna Specification
! Note When! using! active! antennas,! it! is! important! to! recognize! the! voltage! drop! of! the! bias! voltage!
through!the!coaxial!cable.!!A!too!low!voltage!has!a!negative!impact!on!the!gain!the!pre-amplifier!in!
the!antenna!can!achieve.! ! In!addition,! the!coaxial!cable,!connector!and! layout! structures!on! the!
printed!circuit!board!contribute!to!signal!attenuation.
!
LEA-4A!-!Data!Sheet! PRELIMINARY! Performance Specification!
GPS.G4-MS4-05017-P2! ! Page 7!
your position is our focus
2 Performance Specification
Parameter Specification
Receiver!Type! ! L1!frequency,!C/A!Code,!!
16-Channels!
8192!time!/!frequency!search!windows!
Max!Navigation!Update!Rate! ! 4!Hz!
Accuracy! Position!
Position!DGPS!/!SBAS1!
2.5!m!CEP2! 5.0!m!SEP3!
2.0!m!CEP! 3.0!m!SEP!
Acquisition4,!5! !
!
Cold!Start!
Warm!Start!
Hot!Start!
Aided!Start6!
Reacquisition!
Fast!Acquisition! Normal! High!Sensitivity!
Mode! Mode! Mode!
34!s! 36!s! 41!s!
33!s!
<3.5!s!
5!s!
<1!s!
Sensitivity7! !
!
Acquisition!
Tracking!
Fast!Acquisition! Normal! High!Sensitivity!
Mode! Mode! Mode!
-134!dBm! -138!dBm! -140!dBm!
-143!dBm! -146!dBm! -150!dBm!
Accuracy!of!Timepulse!Signal! RMS!
99%!
Granularity!
50!ns!
<100!ns!
43!ns!
Dynamics!! ! ≤!4!g!
Altitude!
Velocity!
18,000!m!
515!m/s!
Operational!Limits!(COCOM)!
One!of!the!limits!may!be!exceeded!but!not!both.!
Table 6: Performance Specification
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
1!Depends!on!accuracy!of!correction!data!of!DGPS!or!SBAS!service!
2!CEP!=!Circular!Error!Probability:!The!radius!of!a!horizontal!circle,!centered!at!the!antennas!true!position,!containing!50%!of!the!fixes.!
3!SEP!=!Spherical!Error!Probability.!!The!radius!of!the!sphere,!centered!at!the!true!position,!contains!50%!of!the!fixes.!
4!The!different!start-up!modes!like!cold,!warm!and!hot!start!are!described!in!the!System!Integration!Manual![1]!
5!Measured!with!good!visibility!and!-125!dBm!signal!strength!
6!Time!synch.!signal!from!aiding!source!must!be!supplied!to!EXTINT0!pin,!having!accuracy!of!better!than!200!µs!
7!Demonstrated!with!a!good!active!antenna!
!
LEA-4A!-!Data!Sheet! PRELIMINARY! Mechanical Specification!
GPS.G4-MS4-05017-P2! ! Page 8!
your position is our focus
3 Mechanical Specification
3.1 Dimensions
LEA-4A
3.0!±!0.3!mm![118.1!±!12!mil]
17.0!±!0.1!mm![669!±!4!mil]
1
22
.4
!±
!0
.1
!m
m
![8
81
.9
!±
!4
!m
il]
TxD2
RxD2
TxD1
RxD1
VDDIO
VCC
GND
VDD18OUT
GPSMODE6
RESET_N
V_BAT
BOOT_INT
GND
GND
RF_IN
VCC_RF
V_ANT
GPSMODE5
GPSMODE2
GPSMODE7
VDDUSB
USB_DM
USB_DP
EXTINT0
TIMEPULSE
GND
GND
AADET_N
2.85!±!0.1!mm![112.2!±!4!mil]
3.80!±!0.1!mm![149.6!±!4!mil]
2.55!±!0.1!mm![100.4!±!4!mil]
1.10!±!0.1!mm![!!43.3!±!4!mil]
1.10!±!0.1!mm![!!43.3!±!4!mil]
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
!
Figure 2: LEA-4A Dimensions
3.2 Specification
Parameter! Specification! Tolerance Unit
Length! 22.4! ±0.1! mm!
Width! 17.0! ±0.1! mm!
Thickness! 3.0! ±0.3! mm!
Pitch!RF!pins! 1.1! ±0.1! mm!
Pitch!Digital!pins! 1.1! ±0.1! mm!
Weight! 2.1! ! g!
Table 7: Mechanical Specification
!
LEA-4A!-!Data!Sheet! PRELIMINARY! Mechanical Specification!
GPS.G4-MS4-05017-P2! ! Page 9!
your position is our focus
3.3 Pin Assignment
Standard Function Remarks
No! Name! I/O! Description! !
1 TxD2! O! Serial!Port!2! !
2 RxD2! I! Serial!Port!2! Internal!pull-up!
3 TxD1! O! Serial!Port!1! !
4 RxD1! I! Serial!Port!1! Internal!pull-up!
5 VDDIO! I! Pad!voltage!supply! !
6 VCC! I! Supply!voltage! !
7 GND! I! Ground! !
8 VDD18OUT! O! 1.8V!output! !
9 GPSMODE6! I! Boot-time!config.!pin! Internal!pull-up!
10 RESET_N! I/O! Reset! Open!drain,!do!not!drive!high!
11 V_BAT! I! Backup!voltage!
supply!
!
12 BOOT_INT! I! Boot!mode! Default!configuration:!Input,!internal!pull-down!
13 GND! I! Ground! !
14 GND! I! Ground! !
15 GND! I! Ground! !
16 RF_IN! I! GPS!signal!input! Apply!no!DC!through!this!pin!
17 GND! I! Ground! !
18 VCC_RF! O! Output!Voltage!RF!
section!!
!
19 V_ANT! I! Antenna!Bias!voltage! !
20 AADET_N! I! Active!Antenna!
Detect!
Default!configuration:!Input,!internal!pull-down!
21 GPSMODE5! I! Boot-time!config.!pin! Internal!pull-down!
22 GPSMODE2! I! Boot-time!config.!pin! Internal!pull-up!
23 GPSMODE7! ! Boot-time!config.!pin! Internal!pull-up!
24 VDDUSB! I! USB!Supply! !
25 USB_DM! I/O! USB!Data! !
26 USB_DP! I/O! USB!Data! !
27 EXTINT0! I! External!Interrupt!Pin! Internal!pull-up!
28 TIMEPULSE! O! Time!pulse!(1PPS)! !
Table 8: Signals and Module Interface
! Attention! The!TxD1,!TxD2!and!TIMEPULSE!are!powered!with!the!VDDIO!pin.!
For!more!information!see!the!System Integration Manual for ANTARIS 4![1].!
!
LEA-4A!-!Data!Sheet! PRELIMINARY! Electrical Specification!
GPS.G4-MS4-05017-P2! ! Page 10!
your position is our focus
4 Electrical Specification
4.1 Absolute Maximum Ratings
Parameter Symbol Min Max Units
Power Supply
Power!supply!voltage!(VCC)! Vcc! -0.3! 3.6! V!
I/O!supply!voltage!(VDDIO)! Vddio! -0.3! 3.6! V!
Backup!battery!voltage!(V_BAT)! Vbat! -0.3! 3.6! V!
Input Pins
Input!pin!voltage!(all!except!RESET_N)! Vin! -0.3! 5! V!
Input!pin!voltage!of!RESET_N! Vin_reset! -0.3! 1.95! V!
Input!pin!voltage!VDDUSB! Vin_usb! -0.3! 3.6! V!
Input!pin!voltage!USB_DP,!USB_DM! Vin_usbio! -1! 4.6! V!
Voltage Supply output for Active Antenna and RF Section
VCC_RF!output!current! Iccrf! ! 50! mA!
RF Input
Antenna!bias!voltage!(applied!via!V_ANT)! Vant! 0! 6! V!
Antenna!bias!current!(applied!via!V_ANT)! Iant! ! 100! mA!
Input!power!at!RF_IN!
(source!impedance!50Ω,!continuous!wave)!
Prfin! ! -5! dBm!
Environment
Storage!temperature! Tstg! -40! 85! °C!
Table 9: Absolute Maximum Ratings
! Warning Stressing! the! device! beyond! the! Absolute!Maximum! Ratings!may! cause! permanent! damage.!
These!are!stress!ratings!only.!The!product!is!not!protected!against!overvoltage!or!reversed!voltages.!
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.!
!
LEA-4A!-!Data!Sheet! PRELIMINARY! Electrical Specification!
GPS.G4-MS4-05017-P2! ! Page 11!
your position is our focus
4.2 Operating Conditions
Parameter8 Symbol Condition Min Typ Max Units
Power Supply
Power!supply!voltage!(VCC)! Vcc! ! 2.7! ! 3.3! V!
I/O!supply!voltage!(VDDIO)! Vddio! ! 1.65! ! 3.6! V!
Power!supply!voltage!ripple! Vcc_PP! ! ! ! 50! mV!
Sustained!supply!current!9! Icc! Vcc!=!3.0!V! ! 35! !
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