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: [phone]/ Fax: [phone]
[e-mail]
www.globalsat.com.tw
USGlobalSat, Inc.
14740 Yorba Court, Chino, CA 91710
Tel: [phone] / Fax: [phone]
[e-mail]
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
C3
470PF
GPS_3V3
MS518S-FL35E
BATTERY
12
C6
0.1UF
1 2
A1
GPS_ANTENNA
1
GPS POWER
C1
22UF/10V
L4
BLM18AG121SN1D
D1
RB521S
M1
EB-3531
1
2
3
4
5
21
6
7
8
9
10 11
12
13
14
15
22
16
17
18
19
20
RXB
TXB
1PPS
TXA
RXA
GND
NC
GPIO0
GPIO1
RF_PWR
ON_OFF VBAT
VCC
GPIO13
GPIO14
GPIO15
GND
BOOTSEL
VCC_RF
GND
RF_IN
GND
R6
270R
1 2
U1
XC6209B332MRN 3.3V
1
2
43
5
VIN
GND
NCCE
VOUT
C2
10UF/16V
GPS_3V3
C5
1UF
1 2
L3
BLM18AG121SN1D
GPS_3V3
TXA
C7
10UF
D2
RB512S
RXA
L1
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
1.
D1
RB521S
GPS_3V3
M1
EB-3531
1
2
3
4
5
21
6
7
8
9
10 11
12
13
14
15
22
16
17
18
19
20
RXB
TXB
1PPS
TXA
RXA
GND
NC
GPIO0
GPIO1
RF_PWR
ON_OFF VBAT
VCC
GPIO13
GPIO14
GPIO15
GND
BOOTSEL
VCC_RF
GND
RF_IN
GND
MS518S-FL35E
BATTER Y
12
R6
270R
1 2
TXA
D2
RB512S
RXA
L3
BLM18AG121SN1D
RF Sw itch
24-20003-12030N
1
2
1
2
50 Ohm Micro strip line
C7
10UF
C5
1UF
1 2
J1_I-PEX connect
External antenna
12
GPS_3V3
C6
0.1UF
1 2
50 Ohm Micro
strip line
L4
BLM18AG121SN1D
2.
VIN
C2
10UF/16V
C3
470PF
U1
XC6209B332MRN 3.3V
1
2
43
5
VIN
GND
NCCE
VOUT
C1
22UF/10V
GPS POWER
GPS_3V3
L1
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.