Global Sat ET-333 User manual

ET-333

Specifications are subject to be changed without notice.

Page 1 of 15

Version 1.3.1

GPS Engine Board

ET-333

Globalsat Technology Corporation

16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235, Taiwan

Tel: 886-2-8226-3799/ Fax: 886-2-8226-3899

service@globalsat.com.tw

www.globalsat.com.tw

USGlobalSat, Inc.

1308 John Reed Court, City of Industry, CA 91745

Tel: 626-968-4145 / Fax: 626-968-4373

oem@usglobalsat.com

www.usglobalsat.com

ET-333

Specifications are subject to be changed without notice.

Page 2 of 15

Version 1.3.1

1. Product Information

Product Part I.D. ET-333

Product Description:

The ET-333 GPS engine board is low cost but maintains high reliability and accuracy making it an ideal

choice for integration with OEM/ODM systems.

Product Features:

9SiRF StarIII

9Very high sensitivity (Tracking Sensitivity: -159dBm)

9Extremely fast TTFF (Time To First Fix) at low signal levels

9Supports the NMEA 0183 data protocol

9Connector for active antenna

9Compact size

9Foliage Lock for weak signal tracking

9All-in-view 20-channel parallel processing

9Enhanced algorithm for navigation stability

9Superior urban canyon performance

9SuperCap Pad to maintain system data for rapid satellite acquisition (Optional)

9RoHS compliant

Product Specifications

GPS Receiver

Chipset SiRF StarIII

Frequency L1, 1575.42 MHz

Code 1.023 Mhz chip rate

Protocol Electrical Level: TTL level,

Output Voltage Level: 0V~2.85V

Baud Rate: 4800 ~ 57600 bps adjustable

Output Message: NMEA 0183 GGA, GSA,

GSV, RMC, SiRF binary (VTG, GLL optional)

Channels 20

Sensitivity -159dBm

ET-333

Specifications are subject to be changed without notice.

Page 3 of 15

Version 1.3.1

Cold Start 42 seconds average

Warm Start 38 seconds average

Hot Start 1 second average

Reacquisition 0.1 second average

Accuracy Position: 15 meters, 2D RMS

10 meters, 2D RMS, WAAS enabled

Velocity: 0.1 ms (95% SA Off)

Time: 1µs synchronized to GPS time

Maximum Altitude 18,000 meter (60,000 feet) max

Maximum Velocity 515 meter/second (1000 knots) max

Maximum Acceleration 4G

Jerk 20m/sec **3

Interface

I/O Connector Type

External Antenna Port

Physical Characteristic

Dimensions 1.3” x 1.3” x 0.2” (31.8 x 31.8 x 6mm)

DC Characteristics

Power Supply 3.8V ~ 6.5V DC Input

Backup Voltage 2.5 ~ 3.6V 10uA backup current

Power Consumption 42mA (Continuous Mode)

25mA (Trickle Power Mode)

Environmental Range

Humidity Range 5% to 95% non-condensing

Operation Temperature -40F to +176F (-40C to +85C)

ET-333

Specifications are subject to be changed without notice.

Page 4 of 15

Version 1.3.1

2. Technical Information

Physical Characteristics

ET-333

Specifications are subject to be changed without notice.

Page 5 of 15

Version 1.3.1

Pin Assignment

1 GND Ground 3.8~6.5 DC power input (Input)

2 VBAT Backup Battery (Input)

3 VDC 3.3~5.5 DC power input (Input)

4 PBRES Push Button Reset Input (Active Low) (Input)

5 GP101 Special function

6 TX Serial Data Output (GPS Data)(Output)

7 RX Serial Data Input (Command)

8 GND Ground

9 GND Ground

10 SELECT (Reserved)

11 TIMEMARK 1PPS Time Mark Output

12 GND Ground

ET-333

Specifications are subject to be changed without notice.

Page 6 of 15

Version 1.3.1

Pin Explanation

GND: GND provides the ground for the engine boards. Be sure to connect all grounds

VBAT (Backup Battery) This is the battery backup that powers the SRAM and RTC when main power is

removed. Typical current draw is 10uA. Without an external backup battery or Gold-capacitor, the

module/engine board will execute a cold start after every turn on. To achieve the faster start, a battery or

capacitor should be installed. To maximize battery lifetime, the battery voltage should not exceed the

supply voltage and should be between 2.5v and 3.6V. (NOTE:This pin must be kept “HIGH” for operation.

From Vcc connect a 470 Ohm resistor in series with a 3.2v Zener diode to Ground. Then, connect the

VBAT input to Zener’s cathode to pull the input “HIGH”.)

GPI01: User can use this I/O pin for special functions (for example, an on/off indicator LED).

VDC (DC power input) This is the main DC supply for a 3.3V~5.5V power module board.

PBRES (Push button reset) This pin provides an active-low reset input to the engine board. It causes the

engine board to reset and start searching for satellites.

GP101: User can use this I/O pin for special functions (for example, an on/off indicator LED).

SELECT: Do not connect (do not use)

TX: This is the main transmit channel for outputting navigation and measurement data to user’s navigation

software or user-written software.

RX: This is the main receive channel for receiving software commands to the engine board from

SiRfdemo software or from user-written software.

SELECT: Do not connect (Reserved)

Time Mark: This pin provides one pulse-per-second output from the engine board that is synchronized to

GPS time.

GND: GND provides the ground for the engine boards. Be sure to connect all grounds

Mounting

Recommended mounting methods:

a. Use industrial grade double-sided foam tape. Place it on the bottom side of the engine board.

b. A recessed cavity in your housing design with a foam pad to eliminate shifting or movement.

c. Use provided mounting holes on the GPS engine board PCB.

ET-333

Specifications are subject to be changed without notice.

Page 7 of 15

Version 1.3.1

3. Software Commands

NMEA Output Command

GGA-Global Positioning System Fixed Data

Table B-2 contains the values for the following example:

$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,,,,0000*18

Table B-2 GGA Data Format

Name Example Units Description

Message ID $GPGGA GGA protocol header

UTC Time 161229.487 hhmmss.sss

Latitude 3723.2475 ddmm.mmmm

N/S Indicator N N=north or S=south

Longitude 12158.3416 dddmm.mmmm

E/W Indicator W E=east or W=west

Position Fix Indicator 1 See Table B-3

Satellites Used 07 Range 0 to 12

HDOP 1.0 Horizontal Dilution of Precision

MSL Altitude19.0 meters

Units M meters

Geoid Separation1meters

Units M meters

Age of Diff. Corr. second Null fields when DGPS is not used

Diff. Ref. Station ID 0000

Checksum *18

<CR><LF> End of message termination

SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights.

Table B-3 Position Fix Indicator

Value Description

0 Fix not available or invalid

1 GPS SPS Mode, fix valid

2 Differential GPS, SPS Mode , fix valid

3 GPS PPS Mode, fix valid

ET-333

Specifications are subject to be changed without notice.

Page 8 of 15

Version 1.3.1

GLL-Geographic Position-Latitude/Longitude

Table B-4 contains the values for the following example:

$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C

Table B-4 GLL Data Format

Name Example Units Description

Message ID $GPGLL GLL protocol header

Latitude 3723.2475 ddmm.mmmm

N/S Indicator n N=north or S=south

Longitude 12158.3416 dddmm.mmmm

E/W Indicator W E=east or W=west

UTC Position 161229.487 hhmmss.sss

Status A A=data valid or V=data not valid

Checksum *2C

<CR><LF> End of message termination

GSA-GNSS DOP and Active Satellites

Table B-5 contains the values for the following example:

$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,1.0,1.5*33

TableB-5GSADataFormat

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode1 A See Table B-6

Mode2 3 See Table B-7

Satellite Used107 Sv on Channel 1

Satellite Used102 Sv on Channel 2

Satellite Used1Sv on Channel 12

PDOP 1.8 Position dilution of Precision

HDOP 1.0 Horizontal dilution of Precision

VDOP 1.5 Vertical dilution of Precision

Checksum *33

<CR><LF> End of message termination

1. Satellite used in solution.

ET-333

Specifications are subject to be changed without notice.

Page 9 of 15

Version 1.3.1

TableB-6Mode1

Value Description

M Manual-forced to operate in 2D or 3D mode

A 2D automatic-allowed to automatically switch 2D/3D

TableB-7Mode2

Value Description

1 Fix Not Available

2 2D

3 3D

GSV-GNSS Satellites in View

Table B-8 contains the values for the following example:

$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71

$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41

TableB-8GSVDataFormat

Name Example Units Description

Message ID $GPGSV GSV protocol header

Number of Messages12 Range 1 to 3

Message Number11 Range 1 to 3

Satellites in View 07

Satellite ID 07 Channel 1(Range 1 to 32)

Elevation 79 degrees Channel 1(Maximum90)

Azimuth 048 degrees Channel 1(True, Range 0 to 3

SNR(C/No) 42 dBHz Range 0 to 99,null when not tr

……. …….

Satellite ID 27 Channel 4 (Range 1 to 32)

Elevation 27 Degrees Channel 4(Maximum90)

Azimuth 138 Degrees Channel 4(True, Range 0 to 3

SNR(C/No) 42 dBHz Range 0 to 99,null when not tr

Checksum *71

<CR><LF> End of message termination

Depending on the number of satellites tracked multiple messages of GSV data may be required.

ET-333

Specifications are subject to be changed without notice.

Page 10 of 15

Version 1.3.1

RMC-Recommended Minimum Specific GNSS Data

Table B-9 contains the values for the following example:

$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,*10

Table B-9 RMC Data Format

Name Example Units Description

Message ID $GPRMC RMC protocol header

UTC Time 161229.487 hhmmss.sss

Status A A=data valid or V=data not valid

Latitude 3723.2475 ddmm.mmmm

N/S Indicator N N=north or S=south

Longitude 12158.3416 dddmm.mmmm

E/W Indicator W E=east or W=west

Speed Over Ground 0.13 knots

Course Over Ground 309.62 degrees True

Date 120598 ddmmyy

Magnetic Variation2degrees E=east or W=west

Checksum *10

<CR><LF> End of message termination

SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are

Geodetic WGS48 directions.

VTG-Course Over Ground and Ground Speed

$GPVTG,309.62,T,,M,0.13,N,0.2,K*6E

Table B-9 VTG Data Format

Name Example Units Description

Message ID $GPVTG VTG protocol header

Course 309.62 degrees Measured heading

Reference T True

Course degrees Measured heading

Reference M Magnetic

Speed 0.13 knots Measured horizontal speed

Units N Knots

Speed 0.2 Km/hr Measured horizontal speed

Units K Kilometers per hour

Checksum *6E

<CR><LF> End of message termination

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