Global Sat ET-314 Manuale utente

ET-314

Page1of19

Version 1.2

GPS Engine Board ET-314

Version 1.2

06/22/2007

Globalsat Technology Corporation Headquarters (Far East Century Park)

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

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

E-mail : service@globalsat.com.tw

Website: www.globalsat.com.tw

ET-314

Page 2 of 19

Version 1.2

1. Product Information

Product Name: ET-314

Product Description:

ET-314 is a compact, high performance, and low power consumption GPS engine board. It uses SiRF

Star III chipset which can track up to 20 satellites at a time and perform fast TTFF in weak signal

environments. ET-314 is suitable for the following applications:

‧ Automotive navigation

‧ Personal positioning

‧ Fleet management

‧ Marine navigation

Product Features:

SiRF star III high performance GPS Chipset

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

Extremely fast TTFF (Time To First Fix) at low signal level

Two serial ports

4Mb flash

Compact size (25.4mm * 25.4 mm * 3.3mm) suitable for space-sensitive application

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

Support NMEA 0183 and SiRF binary protocol

Product Specifications

GPS Receiver

Chipset SiRF StarⅢ

Frequency L1, 1575.42 MHz

Code C/A Code

Protocol NMEA 0183 v2.2

Default:GGA,GSA,GSV,RMC

Support:VTG,GLL,ZDA)

SiRF binary and NMEA Command

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

Channels 20

Flash 4Mbit

ET-314

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Version 1.2

Sensitivity Tracking:-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

Velocity: 0.1 m/s

Time: 1us synchronized to GPS time

Maximum Altitude ＜18,000 meter

Maximum Velocity ＜515 meter/second

Maximum Acceleration ＜4G

Update Rate 1 Hz

DGPS WAAS, EGNOS, MSAS

Datum WGS-84

Interface

I/O Pins 2 serial ports

Physical Characteristic

Type 30-pin stamp holes

Dimensions 25.4 mm * 25.4 mm * 3.3 mm

DC Characteristics

Power Supply 3.3Vdc ± 5%

Backup Voltage 2.0 ~ 3.6Vdc ± 10%

Power Consumption Acquisition: 42mA

Tracking: 25mA

Environmental Range

Humidity Range 5% to 95% non-condensing

Operation Temperature -40℃ to 85℃

Storage Temperature -40℃ to 125℃

ET-314

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Version 1.2

2. Technical Information

Block Diagram

Module Pin Assignment:

ET-314

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Version 1.2

Pin Signal Name I/O Description

1 VCC I DC Supply Voltage input

2 GND G Ground

3 Boot select I Boot mode

4 RXA I Serial port A

5 TXA O Serial portA

6 TXB O Serial port B

7 RXB I Serial port B

8 GPIO14 I/O General –purpose I/O

9 RF_ON

10 GND G Digital Ground

16 GND_A G Analog Ground

17 RF_IN I GPS Signal input

18 GND_A G Analog Ground

19 V_ANT_IN I Active Antenna Bias voltage

20 VCC_RF O Supply Antenna Bias voltage

21 V_BAT I Backup voltage supply

22 Reset I Reset (Active low)

23 GPIO10 I/O General purpose I/O

24 GPIO1 I/O General purpose I/O

25 GPIO5 I/O General purpose I/O

26 GPIO0 I/O General purpose I/O

(support continuous power mode only)

27 GPIO13 I/O General purpose I/O

28 GPIO15 I/O General purpose I/O

29 PPS O One pulse per second

30 GND G Digital Ground

Definition of Pin assignment

VCC

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

GND

provides

the

ground

for

digital

rt.

ET-314

Page 6 of 19

Version 1.2

Boot select

Set

this

high

for

programming

lash.

RXA

This

main

receiver

channel

and

used

receive

ware

commands

to the

board

from

SIRFdemo

sof

ware

from

user

written

sof

ware.

PS:

Pull

not

used.

RXB

This

auxiliary

receiving

channel

and

used

input

erential corrections

the

board

enable

DGPS

navigation.

PS:

Pull

not

used.

TXA

This

the

main

transmitting

channel

and

used

output

navigation

and

measuremen

data

SiRFdemo

user

written

software.

TXB

For

user’s

application

(not

currently

used).

RF_ON

This

indicates

state

voltage.

RF_IN

This

receiver

signal

GPS

analog

.due

the

characteristics

the signal

the

design

has

certain

criteria.

The

line

the

PCB

from

the antenna(or

antenna

connector)

has

controlled

microstrip

line at

V_ANT_IN

This

reserved

external

power

supply

for

active

antenna.

using

3.3V

active

antenna,

has

connected

20.

If the bias voltage of active isn’t 3.3V

,you can input bias voltage of you need to this pin.

VCC_RF

This

provides

voltage

3.3

for

active

antenna. Reset

ET-314

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Version 1.2

This

provides

active-low

rese

input

the

board.

causes

the

board

to reset

and

start

searching

for

satellites.

not

utilized,

may

left

open.

PPS

This

provides

one

pulse-per-second

output

from

the

board,

which

synchronized

GPS

time.

This

not

available

Trickle

Power

mode

Backup

battery

(V_BAT)

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.

Without

external

backup

battery

super

cap

the

TMP

will

execute

cold start

after

every

power

achieve

the

faster

start-up

offered

hot

warm

start,

either

battery

backup

must

connected

super

cap

installed.

maximize

battery

lifetime,

the

battery

voltage

should

not

exceed

the

supply voltage

and

should

between

2.5V

and

3.6V

With

the

super

cap

(B1)

installed,

and

after

least

ten

minutes

continuous operation,

the

data

retention

about

seven

hours.

Note

that

even

though

all

other

components

are

rated

–30

+85

deg

a typical

super

cap

specified

over

temperature

range

–25

+70

deg

and

typical

rechargeable

Lithium

battery

over

–20

+70

deg

GPIO

Functions

Several

I/Os

are

connected

the

digital

interface

connector

for

custom

applications

ET-314

Page 8 of 19

Version 1.2

Application Circuit

GPIO_0

ACTIVE ANT

GPIO_14

V_BAT

GPIO_5

TXA

TXB

GPIO_10

VCC

VCC_RF

1PPS

RXB

V_ANT

GPIO_1

GPIO_15

50 ohm microstrip line

VCC

10k

1 2

10k

1 2

GPIO_13

RESET

RXA

BOOT

U1 GPS

TXB

GND

GPIO_13

GPIO_15

1PPS

TXA

RXA

Bootselect

GND

VCC

RXB

GPIO_14

RF_ON

GND

A_GND

GPIO_0

GPIO_5

GPIO_1

GPIO_10

NRESET

V_BAT

VCC_RF

V_ANT

A_GND

RF_IN

A_GND

10k

1 2

10k

1 2

(1) Ground Planes:

ET-314 GPS receiver needs two different ground planes. The GND_A pin(11、

12、13、14、15、16、18) shall be connect to analog ground. The GND pin(2、

10、30) connect to digital ground.

(2) Serial Interface:

The Serial interface pin(RXA、TX1、TXB、RXB) is recommended to pull up(10KΩ).

It can increase the stability of serial data.

(3) Backup Battery:

It’s recommended to connect a backup battery to V_BAT.

In order to enable the warm and hot start features of the GPS receiver. If you don’t intend to use a

backup battery, connect this pin to GND or open.

If you use backup battery, shall need to add a bypassing capacitor (10uF) at V_bat trace. It can

reduce noise and increase the stability.

(4) Antenna:

Connecting to the antenna has to be routed on the PCB. The transmission line must to controlled

ET-314

Page 9 of 19

Version 1.2

impedance to connect RF_IN to the antenna or antenna connector of your choice.

(5) Active antenna bias voltage:

The Vcc_RF pin (pin 20) is providing voltage 3.3V. If you use active antenna, you can connect this pin

to V_ANT_IN pin (pin 19) to provide bias voltage of active

GPS Active Antenna Specification(Recommendation)

Frequency: 1575.42+2 MHz

Axial Ratio: 3 dB Typical

output Impedance: 50Ω

Polarization: RHCP

Amplifier Gain :20~26dB Typical

Output VSWR: 2.0 Max.

Noise Figure: 2.0 dB Max

Dimensions

ET-314

Page 10 of 19

Version 1.2

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