Global Sat EB-3531 User manual

EB-3531

Specifications are subject to be changed without notice.

Page 1 of 21

Version 1.2.1

GPS Engine Board

EB-3531

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

EB-3531

Specifications are subject to be changed without notice.

Page 2 of 21

Version 1.2.1

1. Product Information

Product Part I.D. EB-3531

Product Description:

The EB-3531 is a compact, high performance, low power consumption GPS engine board. It

features a SiRF Star III chipset, which can track up to 20 satellites at a time and perform fast

TTFF (time to first fix) in weak signal environments. The EB-3531 is ideal for automotive or

marine navigation, personal positioning, fleet management, and mobile-phone navigation.

Product Features

9SiRF GSC3f/LP high performance GPS Chipset

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

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

9All-in-view 20-channel parallel processing

9Two serial ports

94Mb flash

9Built-in LNA

9Compact size (15mm * 13mm * 2.2mm) suitable for space-sensitive application

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

9Support NMEA 0183 and SiRF binary protocol

9WAAS / EGNOS MSAS support

9RoHS compliant

Product Specifications

GPS Receiver

Chipset SiRF GSC3f/LP

Frequency L1, 1575.42 MHz

Code C/A Code

Protocol NMEA 0183 v3.0

Default:GGA,GSA,GSV,RMC

Support:VTG,GLL,ZDA)

SiRF binary and NMEA Command

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

EB-3531

Specifications are subject to be changed without notice.

Page 3 of 21

Version 1.2.1

Channels 20

Flash 4Mbit

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 22-pin stamp holes

Dimensions 15 mm * 13mm * 2.2 mm ±0.2mm

DC Characteristics

Power Supply 3.3Vdc ±5%

Backup Voltage 2.0 ~ 3.6Vdc

Power Consumption Acquisition: 60mA

Tracking: 42mA

Environmental Range

Humidity Range 5% to 95% non-condensing

Operation Temperature -30C to 85C

Storage Temperature -40C to 85C

EB-3531

Specifications are subject to be changed without notice.

Page 4 of 21

Version 1.2.1

2. Technical Information

Block Diagram

Module Pin Assignment

EB-3531

Specifications are subject to be changed without notice.

Page 5 of 21

Version 1.2.1

Pin NO. Pin Name I/O Remark

1. RXB I Serial input (default null)

2. TXB O Serial output (default null)

3. TIMEMARK I/O One pulse per second.

4. TXA O Serial output (default NMEA)

5. RXA I Serial input (default NMEA)

6. NC NC

7. GPIO0 I/O General purpose I/O

8. GPIO1 I/O General purpose I/O

9. RF_PWR CTR RF Power ON/OFF.

10. ON_OFF I Edge triggered soft on/off request. It must be low for normal application.

11. VBAT PWR Backup battery supply voltage

12. VCC PWR Main power supply to the engine board.

13. GPIO13 I/O General purpose I/O

14. GPIO14 I/O General purpose I/O

15. GPIO15 O GPS status output.

16. BOOTSEL I/O Set this pin to high for programming flash.

17. VCC_RF PWR Regulated RF power output.

18. GND G Ground.

19. RF IN RF GPS antenna input.

20. GND G Ground.

21. GND G Ground.

22. GND G Ground.

EB-3531

Specifications are subject to be changed without notice.

Page 6 of 21

Version 1.2.1

Application Circuit

VIN

470PF

GPS_3V3

MS518S-FL35E

BATTERY

0.1UF

1 2

GPS_ANTENNA

GPS POWER

22UF/10V

BLM18AG121SN1D

RB521S

EB-3531

10 11

RXB

TXB

1PPS

TXA

RXA

GND

GPIO0

GPIO1

RF_PWR

ON_OFF VBAT

VCC

GPIO13

GPIO14

GPIO15

GND

BOOTSEL

VCC_RF

GND

RF_IN

GND

270R

1 2

XC6209B332MRN 3.3V

VIN

GND

NCCE

VOUT

10UF/16V

GPS_3V3

1UF

1 2

BLM18AG121SN1D

GPS_3V3

TXA

10UF

RB512S

RXA

BLM18AG121SN1D

GPS Active Antenna Specifications (Recommendation)

Frequency: 1575.42 + 2MHz

Axial Ratio: 3 dB Typical

Output Impedance: 50

Polarization: RHCP

Amplifier Gain: 18~22dB Typical

Output VSWR: 2.0 Max.

Noise Figure: 2.0 dB Max

Antenna Input Voltage: 2.85V (Typ.)

EB-3531

Specifications are subject to be changed without notice.

Page 7 of 21

Version 1.2.1

Dimensions

Recommend Layout PAD

Tolerances: ±0.1mm

EB-3531

Specifications are subject to be changed without notice.

Page 8 of 21

Version 1.2.1

Application Guideline

Application Circuit

RB521S

GPS_3V3

EB-3531

10 11

RXB

TXB

1PPS

TXA

RXA

GND

GPIO0

GPIO1

RF_PWR

ON_OFF VBAT

VCC

GPIO13

GPIO14

GPIO15

GND

BOOTSEL

VCC_RF

GND

RF_IN

GND

MS518S-FL35E

BATTER Y

270R

1 2

TXA

RB512S

RXA

BLM18AG121SN1D

RF Sw itch

24-20003-12030N

50 Ohm Micro strip line

10UF

1UF

1 2

J1_I-PEX connect

External antenna

GPS_3V3

0.1UF

1 2

50 Ohm Micro

strip line

BLM18AG121SN1D

VIN

10UF/16V

470PF

XC6209B332MRN 3.3V

VIN

GND

NCCE

VOUT

22UF/10V

GPS POWER

GPS_3V3

BLM18AG121SN1D

EB-3531

Specifications are subject to be changed without notice.

Page 9 of 21

Version 1.2.1

Layout Rules

Do not route the other signal or power trace under the engine board.

* RF:

This pin receives signal of GPS analog via external active antenna. It has to be a controlled

impedance trace at 50ohm.

Do not place the RF traces close to the other signal path and not routing it on the top layer.

Keep the RF traces as short as possible.

* Antenna:

Keep the active antenna on the top of your system and confirm the antenna radiation

pattern、axial ratio、power gain、noise figure、VSWR are correct when you Setup the antenna

in your case.

GPS Passive (or Active) Antenna Specifications (Recommendation)

Frequency: 1575.42±2 MHz

Axial Ratio: 3 dB Typical

Output Impedance: 50

Polarization: RHCP

Output VSWR: 1.5 Max.

Active option

Low Noise Amplifier:

Amplifier Gain: 18~22dB Typical

Output VSWR: 2.0 Max.

Noise Figure: 2.0 dB Max.

Antenna Input Voltage: 2.85V Typical

EB-3531

Specifications are subject to be changed without notice.

Page 10 of 21

Version 1.2.1

Design Notes

VCC: This is the main power supply to the engine board. (3.3Vdc ± 5%).

GND: Ground pin for the baseband circuit.

RXA: This is the main channel for receiving software commands from SiRFdemo software or

from your proprietary software.

RXB: For user’s application (default null).

TXA: This is the main channel for transmitting navigation and measurement data to a navigation

software or user written software. Output TTL level, 0V ~ 2.85V.

TXB: For user’s application (default null).

RF_IN: This pin receives signal of GPS analog via external active antenna. It has to be a

controlled impedance trace at 50ohm. Do not have RF traces closed the other signal path and

routing it on the top layer. Keep the RF traces as short as possible.

VBAT: This is the battery backup power input for the SRAM and RTC when main power is

removed. Typically, the current draw is 15uA. Without the external backup battery, the

module/engine board will always execute a cold star after turning 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 3.6v. (NOTE:When not in use 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 Rx

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

GPIO: User can use this I/O pin for special functions. (For example, control LED).

BOOTSEL: Set this pin to high for programming flash.

VCC_RF: Provide Active Antenna Power 2.85V.

ON_OFF: Edge triggered soft on/off request. It must be low for normal application.

GPIO15: GPS status output. You can connect it to an LED.

Tracking:

Fixing: Hi

RF_PWR_CTRL: RF power ON/OFF control. Hi: RF Power ON. Low: RF Power OFF.

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