Global Sat ET-318 User manual

ET-318

Specifications are subject to be changed without notice.

Page 1 of 16

Version 1.3.1

GPS Engine Board

ET-318

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.

14740 Yorba Court, Chino, CA 91710

Tel: 909.597.8525 / Fax: 909.597.8532

oem@usglobalsat.com

www.usglobalsat.com

ET-318

Specifications are subject to be changed without notice.

Page 2 of 16

Version 1.3.1

Product Information

Product Part I.D. ET-318

Product Description: SMT GPS Board

Product Features:

9SiRF StarIII/FLP chipset

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

920 channels

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

9Compact size

9One size component, easy to mount on another PCB board

9Support NMEA 0183 and SiRF binary protocol

Product Specifications

GPS Receiver

Chipset SiRF StarIII/FLP

Frequency L1, 1575.42 MHz

Code 1.023 MHz chip rate

Protocol NMEA 0183

Default: GGA, GSA, GSV, RMC, VTG, GLL

SiRF binary and NMEA Command

Available Baud Rate 4,800 to 57,600 bps adjustable

Channels 20

Sensitivity -159dBm

Cold Start 42 seconds average

Warm Start 38 seconds average

Hot Start 1 second average

Reacquisition 0.1 second average

Accuracy Position: 10 meters, 2D RMS

5 meters, 2D RMS, WAAS enabled

ET-318

Specifications are subject to be changed without notice.

Page 3 of 16

Version 1.3.1

Velocity: 0.1 m/s

Time: 1us synchronized to GPS time

Maximum Altitude 18,000 meter

Maximum Velocity 515 meter/second

Maximum Acceleration 4G

Jerk 20m/sec **3

Datum WGS-84 Default

Interface

I/O Connector Type

External Antenna Port

Physical Characteristic

Dimensions 0.6” x 0.55” x 0.11” (15.2 x 14 x 2.8 mm)

DC Characteristics

Power Supply 3.3V ±5% DC Input

Power Consumption 42mA (Continuous Mode)

25mA (Trickle Mode)

Environmental Range

Humidity Range 5% to 95% non-condensing

Operation Temperature -40C to 85C

Storage Temperature -40C to 85C

Recommended GPS Active/Passive Antenna Specifications

Frequency: 1575.42+2 MHz

Axial Ratio: 3 dB Typical

Output Impedance: 50Ω

Polarization: RHCP

Output VSWR: 1.5 Max.

Active Option: Low Noise Amplifier

Amplifier Gain: 20~26dB Typical

Output VSWR: 2.0 Max.

Noise Figure: 2.0 dB Max.

ET-318

Specifications are subject to be changed without notice.

Page 4 of 16

Version 1.3.1

2. Technical Information

Pin Assignment

Pin Signal Name I/O Description

1 GND G Analog Ground

2 RF_IN RF GPS Signal input

3 GND G Analog Ground

4 NRESET I Reset (Active low)

5 VCC_IN PWR DC Supply Voltage input

6 VBAT PWR Backup voltage supply

7 RXB I Serial port B

8 TXB O Serial port B

9 GND G Analog Ground

10 BOOTSEL Boot mode

11 TXA O Serial port A

12 RXA I Serial port A

13 GPIO1 I General –purpose I/O

14 GPIO14 I General –purpose I/O

15 TIMEMARK O One pulse per second

16 GPIO13 I General –purpose I/O

17 GPIO15 I General –purpose I/O

ET-318-01 Bottom View

ET-318

Specifications are subject to be changed without notice.

Page 5 of 16

Version 1.3.1

Pin Explanation

VCC_IN

This is the main DC supply for a 3.3V +- 5% DC input power module board.

GND

GND provides the ground for digital part.

BOOTSEL

Set this pin to high for programming flash.

RXA

This is the main receiver channel and is used to receive software commands to the board from SIRFdemo

software or from user written software. Pull up if not used.

RXB

This is the auxiliary receiving channel and is used to input differential corrections to the board to enable

DGPS navigation. Pull up if not used.

TXA

This is the main transmitting channel and is used to output navigation and measurement data to

SiRFdemo or user written software.

TXB

For user’s application (not currently used).

RF_IN

This pin receiver signal of GPS analog .due to the RF characteristics of the signal the design has to certain

criteria. The line on the PCB from the antenna (or antenna connector) has to be a controlled microstrip line

at 50Ω.

PPS

This pin provides one pulse-per-second output from the board, which is synchronized to GPS time. This is

not available in Trickle Power mode.

VBAT (memory Back-up)

This is the battery backup input that powers the SRAM and RTC when main power is removed. Typical

current draw is 15uA. Without an external backup battery, the module/engine board will execute a cold star

after every turn on. To achieve the faster start-up offered by a hot or warm start, a battery backup must be

connected. The battery voltage should be between 2.0v and 5.0v. (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”.)

TIMEMARK

This pin provides one pulse-per-second output from the board, which is synchronized to GPS time. This is

not available in Trickle Power mode.

ET-318

Specifications are subject to be changed without notice.

Page 6 of 16

Version 1.3.1

GPIO Functions

Several I/Os are connected to the digital interface connector for custom applications.

Application Circuit

R46

560R

1 2

TXA

RXB

RESET

BATTER Y

GPIO15

50 ohm microstrip line

GPIO13

RXA

SAW FILTER

1 2

U1 GPS

VBAT

VCC_IN

NRESET

GND

RF_IN

GND

RXB

TXB

GND

BOOTSEL

TXA

RXA

GPIO1

GPIO14

TIMEMARK

GPIO15

GPIO13

GPIO1

3.3V

GPIO14

Antenna

RB715F

BOOTSEL

TXB

0.1U

1 2

option

VCC_RF

TIMEMARK

LNA

21 ..

Recommended Layout PAD

ET-318

Specifications are subject to be changed without notice.

Page 7 of 16

Version 1.3.1

Mechanical Layout

ET-318

Specifications are subject to be changed without notice.

Page 8 of 16

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-318

Specifications are subject to be changed without notice.

Page 9 of 16

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-318

Specifications are subject to be changed without notice.

Page 10 of 16

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.

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