Globalsat EB-5318RF User Manual

2012/8/31

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GLOBALSAT GPS Engine Board

Hardware Data Sheet

Product No : EB-5318RF

Version 0.1

Globalsat Technology Corporation

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

Tel: [phone] Fax: [phone]

E-mail : [e-mail]

Website: www.globalsat.com.tw

Issue Date

2011/10/4

APPR

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PREPARE

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Product Description

Product Description

EB-5318RF GPS module features high sensitivity, low power and ultra small form factor. This GPS
module is powered by SiRF Star IV, it can provide you with superior sensitivity and performance
even in urban canyon and dense foliage environment. With SiRF CGEE (Client Generated
Extended Ephemeris) technology, it predicts satellite positions for up to 3 days and delivers
CGEE-start time of less than 15 seconds under most conditions, without any network assistance.
Besides, MicroPower Mode allows GPS module to stay in a hot-start condition nearly continuously
while consuming very little power. EB-5318RF is suitable for the following applications:

 Automotive navigation
 Personal positioning
 Fleet management
 Mobile phone navigation
 Marine navigation

Product Features

 SiRF Star IV high performance GPS Chipset
 Very high sensitivity (Tracking Sensitivity: -163 dBm)
 Extremely fast TTFF (Time To First Fix) at low signal level
 Support UART/I2C interface( Default UART)
 Built-in LNA(with in CHIP)
 Compact size (15.2mm * 14 mm * 2.4mm) suitable for space-sensitive application
 One size component, easy to mount on another PCB board
 Support NMEA 0183 V3.0 (GGA, GSA, GSV, RMC, VTG, GLL, ZDA)
 Support OSP protocol
 MEMS Support : 3-axis Magnetometer for compass heading for “Point and Tell” feature
 MicroPower Mode(MPM) : Reduce MPM current consumption from <500 uA to < 125 uA
 Support SBAS (WASS, EGNOS, MSAS, GAGAN)

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Product Pin Description

PIN Number(s)

Name

Type

Description

Note

1,3,9,18,19

GND

P

Ground.

2

RF IN

RF

GPS antenna input

4

RESET_N

I

System reset (active low)

5

VCC

P

Main power supply to the engine board.

6

V_BAT

P

Backup battery supply voltage

7,8

NC

EB-5318RF reverse pin

10

BOOTSEL

I

Set this pin to high for programming flash.

11

TXD

O

This is the main transmits channel for
outputting navigation and measurement data
to user’s navigation software or user written
software. Output TTL level, 0V ~ 2.85V.

12

RXD

I

This is the main receive channel for receiving
software commands to the engine board from
SiRFdemo software or from user written
software.

13

DR_I2C_DIO

I/O

14

DR_I2C_CLK

I/O

Host I2C Interface.
Support MEMS Sensor , 1.8V Level

1,4

15

TIMEPULSE

O

One pulse per second output.(1PPS)

16

ON_OFF

I

ON_OFF pin is used to command the
EB-5318RF to turn on or off

2

17

WAKE_UP

O

System power on, 1.8V output .

3

<Note>

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1. GPIO is 1.8V Level

2. The ON_OFF pin commands the EB-5318RF ON or OFF. The turn ON command is a
hardware feature of the Power Control FSM when sensing a rising edge on the pin. The turn
OFF command is a software feature based on interrupts related to rising and/or falling edges
and/or sensing of pin levels.

3. The WAKE_UP pin is an output from the EB-5318RF used to enable an external PMIC. A low
on this output indicates that the EB-5318RF is in one of its low-power states (KA-only,
Hibernate, or Standby mode) and requires no more than 60µA of current on the VIO_18 input.
A high on this output indicates that the EB-5318RF is in operational mode requiring an external
regulator to provide enough current on both the VIO_18 and VREG_18 inputs to handle the
peak current requirements of the EB-5318RF.

4. The DR mode I2C interface provides support for dead reckoning (DR) and code upload. The
port has 2 pins, DR_DIO and DR_CLK, both pins are pseudo open-drain and require pull-up
resistors on the external bus.

Electrical Specification

Absolute Maximums Ratings

Parameter

Min.

Typ.

Max.

Conditions

Unit
POWER Supply
Main power supply(VCC)

3.1

3.3

3.5

V

Backup battery supply

2.0 3.5

V

45

50

55

GPS is not 3D Fixed.

mA

Main power supply Current

35

38

45

GPS is 3D Fixed.

mA

RF POWER Supply

VCC

V
RF Input
Input Impedance

50

Ω
Operating Frequency

1.575

Ghz

DC Electrical characteristics

Parameter

Symbol

Min.

Typ.

Max.

Conditions

Units

VI H

0.7*VCC

3.6

V

VI L

-0.4

0.45

V

VOH

0.75*Vgcc

Vgcc

V

VOL

0.4

V

IOH

2

mA

IOL

2

mA

Vgcc is SiRF Star IV Chip power input, 1.8V Vin.

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Receiver Performance

Sensitivity

Tracking :
Autonomous acquisition :

-163dBm

-160 dBm

< 35s
Cold Start – Autonomous
<15s (with CGEE)

< 35s
Warm Start – Autonomous

2

< 15s(with CGEE)

Time-To-First-Fix

1

Hot Start – Autonomous

3

< 1s

Horizontal Position Accuracy

4

Autonomous

< 2.5m

Velocity Accuracy

5

Speed

Heading

< 0.01 m/s

< 0.01 degrees

Reacquisition

0.1 second, average

Update Rate

1 Hz / 5 Hz

Maximum Altitude

< 18,000 meter

Maximum Velocity

< 515 meter/ second

Maximum Acceleration

< 4G

<Note>

1. 50% -130dBm Fu 0.5ppm Tu ±2s Pu 30Km

2. Commanded Warm START

3. Commanded Hot START

4. 50% 24hr static, -130dBm

5. 50% @ 30m/s

Environmental Characteristics

Parameter

Min

Typ

Max

Unit

Humidity Range

5 95

% non-condensing

Operation Temperature

-40

85

℃

Storage Temperature

-40

85

℃

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Physical Characteristic

Type

19-pin stamp holes

Dimensions

15.2mm * 14 mm * 2.4mm

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Application

Application Circuit

GPS Active Antenna Specifications (Recommendation)

Frequency:

1575.42 + 2MHz

Amplifier Gain:

18~22dB Typical
Axial Ratio:

3 dB Typical

Output VSWR:

2.0 Max.
Output Impedance:

50Ω

Noise Figure:

2.0 dB Max
Polarization:

RHCP

Antenna Input Voltage:

3.3V (Typ.)

NOTE:

1. RESET: Low Active, when EB-5318RF is accepted this single, EB-5318RF going to Hibernate
mode. If want EB-5318RF up, need input ON_OFF single.

2. TIMEMARK: One pulse per second output. When EB-5318RF is 3D Fixed, this pin will output
1uS Hi level pulse. If don’t use this, just NC.

3. ECLK: ECLK clock input for frequency aiding applications or as a test clock. If don’t use this,
just NC.

4. GPIO: User can use this I/O pin for special functions. For example, control LED, and can be
used External Interrupts. If don’t use this, just NC.

5. WAKE_UP: EB-5318RF power on, WAKE_UP will output 1.8V.

6. ON_OFF: This pin is controlled EB-5318RF power on. If EB-5318RF want to EB-365 pin to pin
compactable, please ON_OFF connect to WAKE_UP. If don’t use this, just NC.

7. DR I2C interface: The I2C interface supports required sensor instruments such as gyros,
accelerometers, compasses or other sensors that can operate with an I2C bus. If don’t use
this, just NC.

8. VBAT: This is the battery backup power input for the SRAM and RTC when main power is
removed. VBAT is 2V ~ 3.5V.

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OPERATING Description

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.

GND

This is Ground pin for the baseband circuit.

VBAT

This is the battery backup power input for the
SRAM and RTC when main power is off.
Without the external backup battery, EB-365
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 3.5V.

NC

EB-5318RF reserves pin, Just NC.

VCC

This is the main power supply to the engine
board. (3.1Vdc to 3.5Vdc)

RESET

Low Active, when EB-5318RF is accepted this
single, EB-5318RF going to Hibernate mode. If
want EB-5318RF up, need input ON_OFF
single.

TIMEPULSE

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

. If do not use it, Just NC.

ON_OFF

The ON_OFF pin commands the EB-5318RF
ON or OFF. There are multiple methods of
connecting this pin for different applications in
order to minimise host resource requirements.
The ON_OFF pin is used to command the
EB-5318RF to turn on or off:
 The turn on command is a hardware

feature of the Power Control FSM based
on sensing a rising edge on the pin.

 The turn off command is a software

feature based on interrupts related to
rising and/or falling edges and/ or sensing

of pin levels. (Not currently supported.)
The ON_OFF pin processing is carried out by
the Power Control FSM. The ON_OFF rising
edge event during low power modes is
recorded in a status register that is
subsequently read by the processor once it is
running. When the processor is running at the
time of an ON_OFF event, the processor can
poll the status or set-up an interrupt.

WAKE_UP

System power controller, when EB-5318RF

Power ON, this pin will output 1.8Vdc.

TXD

This is the main transmits channel for
outputting navigation and measurement data
to user’s navigation software or user written
software. Output is TTL level, 0V ~ 2.85V.

RXD

This is the main channel for receiving software
commands from SiRFdemo software or from
your proprietary software.

DR I2C Interface

The I2C host port interface supports:

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Operation up to 400kbps
Individual transmit and receive FIFO lengths of
64B

■ The default I2C address values are:
Rx: 0x60
Tx: 0x62

Multi-master I2C mode is supported by default.
Dead reckoning applications support the DR
I2C interface. The I2C interface supports
required sensor instruments such as gyros,

accelerometers, compasses or other sensors
that can operate with an I2C bus.

DRI2C interface supports:
Typical data lengths (command + in/data out)
of several bytes
Standard I2C bus maximum data rate 400kbps
Minimum data rate 100kbps

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SOFTWARE COMMAND

NMEA Output Command

GGA - Global Positioning System Fixed Data

Note – Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA
message description

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,-34.2,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 Altitude

9.0

meters
Units

M

meters
Geoid Separation1

-34.2

meters

Geoid-to-ellipsoid separation.
Ellipsoid altitude=MSL Altitude + Geoid
Separation
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

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

Not supported

6

Dead Reckoning Mode, fix valid

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Note:
A valid status is derived from all the parameters set in the software. This includes the minimum
number of satellites required, any DOP mask setting, presence of DGPS corrections, etc. If the
default or current software setting requires that a factor is met, then if that factor is not met the
solution will be marked as invalid.

GLL - Geographic Position-Latitude/Longitude

Note – Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA
message description

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

$GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41

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

Mode

A A=Autonomous, D=DGPS,

E=DR

N=Output Data Not Valid

R= Coarse Position

1

S=Simulator

Checksum

*41
<CR><LF>

End of message termination

1. Position was calculated based on one or more of the SVs having their states derived from
almanac parameters, as opposed to ephemerides.

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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

Table B-5 GSA Data Format

Name

Example

Units

Description
Message ID

$GPGSA

GSA protocol header
Mode 1

A See Table B-6
Mode 2

3 See Table B-7
Satellite Used1

07 Sv on Channel 1
Satellite Used1

02 Sv on Channel 2
…..
Satellite Used1

Sv on Channel 12
PDOP2

1.8 Position dilution of Precision
HDOP2

1.0 Horizontal dilution of Precision
VDOP2

1.5 Vertical dilution of Precision
Checksum

*33
<CR><LF>

End of message termination

1. Satellite used in solution.

2. Maximum DOP value reported is 50. When 50 is reported, the actual DOP may be much larger.

Table B-6 Mode1

Value

Description
M

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

2Dautomatic-allowed to automatically switch 2D/3D

Table B-7 Mode 2

Value

Description
1

Fix Not Available

2

2D (<4 SVs used)

3

3D (>3 SVs used)

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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

Table B-8 GSV Data Format

Name

Example

Units

Description
Message ID

$GPGSV

GSV protocol header
Number of Messages

1

2 Range 1 to 3
Message Number

1

1 Range 1 to 3
Satellites in View

1

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 359)
SNR(C/No)

42

dBHz

Range 0 to 99,null when not tracking
…….

…….
Satellite ID

27 Channel 4 (Range 1 to 32)
Elevation

27

Degrees

Channel 4(Maximum90)
Azimuth

138

Degrees

Channel 4(True, Range 0 to 359)
SNR(C/No)

42

dBHz

Range 0 to 99,null when not tracking
Checksum

*71
<CR><LF>

End of message termination

1. Depending on the number of satellites tracked, multiple messages of GSV data may be
required. In some software versions, the maximum number of satellites reported as visible is
limited to 12, even though more may be visible.

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RMC - Recommended Minimum Specific GNSS Data

Note – Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA
message description

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,,,A*10

Table B-9 RMC Data Format

Name

Example

Units

Description

Message ID

$GPRMC

RMC protocol header
UTC Time

161229.487

hhmmss.sss
Status1

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 Variation2

degrees

E=east or W=west
East/West Indicator2

E E=east

Mode

A A=Autonomous, D=DGPS,

E=DR

N=Output Data Not Valid

R= Coarse Position

3

S=Simulator

Checksum

*10

<CR><LF>

End of message termination

1. A valid status is derived from all the parameters set in the software. This includes the
minimum number of satellites required, any DOP mask setting, presence of DGPS
corrections, etc. If the default or current software setting requires that a factor is met, then if
that factor is not met the solution will be marked as invalid.

2. SiRF Technology Inc. does not support magnetic declination. All “course over ground” data
are geodetic WGS84 directions relative to true North.

3. Position was calculated based on one or more of the SVs having their states derived from
almanac parameters, as opposed to ephemerides.

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VTG - Course Over Ground and Ground Speed

Note – Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA
message description

Table B-10 contains the values for the following example:

$GPVTG,309.62,T,,M,0.13,N,0.2,K,A*23

Table B-10 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 Magnetic1
Speed

0.13

knots

Measured horizontal speed
Units

N Knots
Speed

0.2

Km/hr

Measured horizontal speed
Units

K Kilometers per hour

Mode

A A=Autonomous, D=DGPS,

E=DR

N=Output Data Not Valid

R= Coarse Position

2

S=Simulator

Checksum

*23
<CR><LF>

End of message termination

1. SiRF Technology Inc. does not support magnetic declination. All “course over ground” data
are geodetic WGS84 directions.

2. Position was calculated based on one or more of the SVs having their states derived from
almanac parameters, as opposed to ephemerides.

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ZDA - Time and Date

This message is included only with systems which support a time-mark output pulse identified as
"1PPS". Outputs the time associated with the current 1PPS pulse. Each message is output within
a few hundred ms after the 1PPS pulse is output and tells the time of the pulse that just occurred.

Table B-11 contains the values for the following example:

$GPZDA,181813,14,10,2003,,*4F<CR><LF>

Table B-11: ZDA Data Format

Name

Example

Unit

Description

Message ID

$GPZDA

ZDA protocol header

UTC Time

181813

hhmmss

The UTC time units are:
hh=UTC hours from 00 to 23 mm=UTC minutes
from 00 to 59 ss=UTC seconds from 00 to 59 Either
using valid IONO/UTC or estimated from default
leap seconds

Day

14 Day of the month, range 1 to 31

Month

10 Month of the year, range 1 to 12

Year

2003

Year

Local zone hour

1

hour

Offset from UTC (set to 00)

Local zone minutes

1

minute

Offset from UTC (set to 00)

Checksum

*4F

<CR><LF>

End of message termination

1. Not supported by CSR, reported as 00.

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NMEA Input Command

A). Set Serial Port ID: 100 Set PORTA parameters and protocol

This command message is used to set the protocol (SiRF Binary, NMEA, or USER1) and/or the
communication parameters (baud, data bits, stop bits, parity). Generally, this command would be
used to switch the module back to SiRF Binary protocol mode where a more extensive command
message set is available. For example, to change navigation parameters. When a valid message
is received, the parameters will be stored in battery backed SRAM and then the receiver will
restart using the saved parameters.

Format:

$PSRF100,<protocol>,<baud>,<DataBits>,<StopBits>,<Parity>*CKSUM<CR><LF>

<protocol>

0=SiRF Binary, 1=NMEA, 4=USER1
<baud>

1200, 2400, 4800, 9600, 19200, 38400
<DataBits>

8,7. Note that SiRF protocol is only valid f8 Data bits
<StopBits>

0,1
<Parity>

0=None, 1=Odd, 2=Even

Example 1: Switch to SiRF Binary protocol at 9600,8,N,1

$PSRF100,0,9600,8,1,0*0C<CR><LF>

Example 2: Switch to User1 protocol at 38400,8,N,1

$PSRF100,4,38400,8,1,0*38<CR><LF>

**Checksum Field: The absolute value calculated by exclusive-OR the 8 data bits of each
character in the Sentence, between, but excluding “$” and “*”. The hexadecimal value of the most
significant and least significant 4 bits of the result are convertted to two ASCII characters (0-9, A-F)
for transmission. The most significant character is transmitted first.

**<CR><LF> : Hex 0D 0A

B). Navigation lnitialization ID：101 Parameters required for start

This command is used to initialize the module for a warm start, by providing current position （in X,
Y, Z coordinates）,clock offset, and time. This enables the receiver to search for the correct
satellite signals at the correct signal parameters. Correct initialization parameters will enable the
receiver to acquire signals more quickly, and thus, produce a faster navigational solution.
When a valid Navigation Initialization command is received, the receiver will restart using the input
parameters as a basis for satellite selection and acquisition.

Format：

$PSRF101,<X>,<Y>,<Z>,<ClkOffset>,<TimeOfWeek>,<WeekNo>,<chnlCount>,<ResetCfg>*CK

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SUM<CR><LF>

<X>

X coordinate position
INT32
<Y>

Y coordinate position
INT32
<Z>

Z coordinate position
INT32
<ClkOffset>

Clock offset of the receiver in Hz, Use 0 for last saved value if available. If
this is unavailable, a default value of 75000 for GSP1, 95000 for GSP 1/LX
will be used.
INT32
<TimeOf Week>

GPS Time Of Week
UINT32
<WeekNo>

GPS Week Number
UINT16
（ Week No and Time Of Week calculation from UTC time）

<chnlCount>

Number of channels to use.1-12. If your CPU throughput is not high enough,
you could decrease needed throughput by reducing the number of active
channels
UBYTE
<ResetCfg>

bit mask
0×01=Data Valid warm/hot start=1
0×02=clear ephemeris warm start=1
0×04=clear memory. Cold start=1
UBYTE

Example: Start using known position and time.

＄PSRF101,-2686700,-4304200,3851624,96000,497260,921,12,3*7F

C). Set DGPS Port ID: 102 Set PORT B parameters for DGPS input

This command is used to control Serial Port B that is an input only serial port used to receive
RTCM differential corrections.
Differential receivers may output corrections using different communication parameters.
The default communication parameters for PORT B are 9600Baud, 8data bits, 0 stop bits, and no
parity. If a DGPS receiver is used which has different communication parameters, use this
command to allow the receiver to correctly decode the data. When a valid message is received,
the parameters will be stored in battery backed SRAM and then the receiver will restart using the
saved parameters.

Format:

＄PSRF102,<Baud>,<DataBits>,<StopBits>,<Parity>*CKSUM<CR><LF>

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<baud>

1200,2400,4800,9600,19200,38400
<DataBits>

8
<StopBits>

0,1
<Parity>

0=None, Odd=1,Even=2

Example: Set DGPS Port to be 9600,8,N,1
＄PSRF102,9600,8,1.0*12

D). Query/Rate Control ID: 103 Query standard NMEA message and/or set output rate

This command is used to control the output of standard NMEA message GGA, GLL, GSA, GSV,
RMC, VTG. Using this command message, standard NMEA message may be polled once, or
setup for periodic output. Checksums may also be enabled or disabled depending on the needs of
the receiving program. NMEA message settings are saved in battery backed memory for each
entry when the message is accepted.

Format:
＄PSRF103,<msg>,<mode>,<rate>,<cksumEnable>*CKSUM<CR><LF>

<msg>

0=GGA,
1=GLL,
2=GSA,
3=GSV,
4=RMC,
5=VTG
6=MSS(if internal beacon is supported)
7=Not defined
8=ZDA(if 1PPS output supported)
9=Not defined
<mode>

0=SetRate
1=Query
2=ABP On
3=ABP Off
<rate>

Output every <rate>seconds, off=0,max=255
<cksumEnable>

0=disable Checksum,1=Enable checksum for specified message

Example 1: Query the GGA message with checksum enabled
＄PSRF103,00,01,00,01*25

Example 2: Enable VTG message for a 1Hz constant output with checksum enabled
＄PSRF103,05,00,01,01*20

Example 3: Disable VTG message
＄PSRF103,05,00,00,01*21

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E). LLA Navigation lnitialization ID: 104 Parameters required to start using Lat/Lon/Alt

This command is used to initialize the module for a warm start, by providing current position (in
Latitude, Longitude, Altitude coordinates), clock offset, and time. This enables the receiver to
search for the correct satellite signals at the correct signal parameters. Correct initialization
parameters will enable the receiver to acquire signals more quickly, and thus, will produce a faster
navigational soution.
When a valid LLA Navigation Initialization command is received, the receiver will restart using the
input parameters as a basis for satellite selection and acquisition.

Format:
＄PSRF104,<Lat>,<Lon>,<Alt>,<ClkOffset>,<TimeOfWeek>,<WeekNo>,<ChannelCount>,

<ResetCfg>*CKSUM<CR><LF>

<Lat>

Latitude position, assumed positive north of equator and negative south of
equator float, possibly signed
<Lon>

Longitude position, it is assumed positive east of Greenwich and negative
west of Greenwich Float, possibly signed
<Alt>

Altitude position float, possibly signed
<ClkOffset>

Clock Offset of the receiver in Hz, use 0 for last saved value if available. If
this is unavailable, a default value of 75000 for GSP1, 95000 for GSP1/LX
will be used.
INT32
<TimeOfWeek>

GPS Time Of Week
UINT32
<WeekNo>

GPS Week Number
UINT16
<ChannelCount>

Number of channels to use. 1-12 UBYTE
<ResetCfg>

bit mask
0×01=Data Valid warm/hot starts=1
0×02=clear ephemeris warm start=1
0×04=clear memory. Cold start=1
UBYTE

Example: Start using known position and time.

＄PSRF104,37.3875111,-121.97232,0,96000,237759,922,12,3*37

F). Development Data On/Off ID: 105 Switch Development Data Messages On/Off

Use this command to enable development debug information if you are having trouble getting
commands accepted. Invalid commands will generate debug information that should enable the
user to determine the source of the command rejection. Common reasons for input command
rejection are invalid checksum or parameter out of specified range. This setting is not preserved
across a module reset.

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Format: ＄PSRF105,<debug>*CKSUM<CR><LF>

<debug>

0=Off, 1=On
Example: Debug On

＄PSRF105,1*3E
Example: Debug Off

＄PSRF105,0*3F

G). Select Datum ID: 106 Selection of datum to be used for coordinate Transformations

GPS receivers perform initial position and velocity calculations using an earth-centered earth-fixed
(ECEF) coordinate system. Results may be converted to an earth model (geoid) defined by the
selected datum. The default datum is WGS 84 (World Geodetic System 1984) which provides a
worldwide common grid system that may be translated into local coordinate systems or map
datums. (Local map datums are a best fit to the local shape of the earth and not valid worldwide.)

Examples:
Datum select TOKYO_MEAN

$PSRF106,178*32

Name

Example

Unit

Description
Message ID

$PSRF106

PSRF106 protocol
header
Datum

178

21=WGS84
178=TOKYO_MEAN
179=TOKYO_JAPAN
180=TOKYO_KOREA
181=TOKYO_OKINAWA
Debug
Checksum

*32
<CR><LF>

End of message
termination

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PCB Layout Recommend

Recommended Layout PAD

Unit: mm
Tolerance: 0.1mm

PCB Layout Recommendations

Do not routing 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.

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Recommended Reflow Profile:

Pre heating temperature:

150±10[℃]

Pre heating time:

90±30[sec.]
Heating temperature:

235±5[℃]

Heating time:

10±1[sec.]

Peak temperature must not exceed 240℃ and the duration of over 200℃ should be 30±10
Seconds.

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Appendix

LABEL Artwork

A: Brand: GLOBALSAT
B: MODULE Model: EB-5318RF
B-1:

R = UART, I = I2C I/F
E = Included EEPROM

F = Included FLASH
C: CHIP Type: SiRF IV
D: Bar code
E: Serial Number:

□ □ □ □□□□

Product NO (HEX)
Place of origin, T= Taiwan, C=China
Product Month, 123456789XYZ, X->Oct,Y->Nov,Z->Dec
Product Year