BU-1612
GPS OEM Module
Data Sheet
Revision: 1.0
Date:2014.08
Highlights:
UBLOX G7020
Compact module size for easy integration
16.4x 12.2 x 2.4 mm,-162dBm
Content
1
Introduction ............................................................................................................................... 2
1.1 Features ............................................................................................................................... 2
2 Pin Assignment .............................................................................................................................. 3
3 Electrical Specification .................................................................................................................. 4
3.1 Absolute maximum ratings ................................................................................................. 4
3.2 Operation Conditions .......................................................................................................... 4
3.3 Environmental Specification ............................................................................................... 5
4 Reference Design ........................................................................................................................... 6
5 Performance Characteristics .......................................................................................................... 7
6 PCB Layout Recommend .............................................................................................................. 8
7 Configuration Management ........................................................................................................... 8
8 Software Interface .......................................................................................................................... 9
9 Recommended Reflow Profile ..................................................................................................... 13
1 Introduction
The BNSTAR BU-1612 module is a high sensitivity, low power and very compact Surface Mount
Device (SMD), and it supports signal processing of L1 band signals such as GPS C/A and SBAS
(including WAAS, EGNOS, and MSAS). This 56-channel global positioning system (GPS)
receiver is designed for a broad spectrum of OEM applications and is based on the fast and
deep GPS
and
signal search capabilities. BNSTAR BU-1612
easy integration
is designed
to allow quick
into GPS-related applications, especially for compact size devices, such
as:
PDA, Pocket PC and other computing devices
Fleet Management / Asset Tracking
AVL and Location-Based Services
Hand-held Device for Personal Positioning and Navigation
1.1 Features
Hardware and Software
56 acquisition channels and achieve -162dBm tracking
Compact module size for easy integration: 16.4 x12.2 x2.4 mm.
SMT pads allow for fully automatic assembly processes equipment and reflow soldering
Built-in LDO, regulators to decrease extra-BOM cost
Up to 10Hz update rate
Embedded DC/DC circuitry to prolong battery life
AGPS supported
Performance
Cold/Warm/Hot Start Time: 29 / 28 / 1 sec.
RF Metal Shield for best performance in noisy environments
Enhanced Navigation Performance
Interface
TTL level UART interface
Protocol: NMEA
Baud Rate: 9600 bps(Default)
Advantages
Ideal for compact size devices
Data / Power / RF through surface mount pads
Flexible and cost effective hardware design for different application requirements
Secure SMD PCB mounting method
2 Pin Assignment
Pin Numbers
Name
1,2,4,8,14,15,
NC
Type
Description
NC
16,17
3
1PPS
O
One pulse per second output
5
USB_DM
I/O
I/O Differential USB D+
6
USB_DP
I/O
I/O Differential USB D-
7
USB_PWR
P
USB Power Supply
9
VCC_RF
P
Supply Antenna Bias voltage(V =
Vcc)
11
RF_IN
I
GPS Antenna Input
Note
10,12,13,24
GND
P
Ground
18
DDC_SDA
I/O
DDC Serial Data in/out
19
DDC_SCL
I
DDC Serial Clock Input
20
UART_TX
O
TTL UART output,0~3.3V
21
UART_RX
I
TTL UART input
22
VBAT
P
Backup battery supply voltage
23
VCC_MAIN
P
Main power supply voltage
3 Electrical Specification
3.1 Absolute maximum ratings
Parameter
Symbol
Min
Max
Unit
Power Supply Voltage
VCC_MAIN
-0.5
3.6
V
Backup Supply Voltage
VBAT
-0.5
3.6
V
USB Power Supply
USB_PWR
3.0
3.6
V
3.2 Operation Conditions
Parameter
Symbol
Min
Typ
Max
Unit
VCC_MAIN
1.8
3.3
3.6
V
Main Power Supply
Power Supply Voltage
Operating Current
35
mA
Backup Power Supply
Backup Supply Voltage
VBAT
1.6
3.3
3.6
V
Operating Current(Working)
185
uA
Operating Current(Sleep)
15
uA
USB Power Supply
USB Power
USB_PWR
3.0
3.3
3.6
V
Input Low Voltage
Vil
0
0.72
V
Input High Voltage
Vih
2.0
3.6
V
Output Low Voltage
Vol
0.4
V
Output High Voltage
Voh
2.4
Input Low Voltage
Vil
0
0.8
V
Input High Voltage
Vih
2.0
USB_P
V
UART/DDC/IO
V
USB Interface
WR
Output Low Voltage
Vol
0.3
V
Output High Voltage
Voh
2.8
3.3 Environmental Specification
Item
Description
Operating temperature range
-40 deg. C to +85 deg. C
Storage temperature range
-40 deg. C to +85 deg. C
Altitude
50,000 m
Velocity
500 m/s
Jerk
V
4 Reference Design
M2
1
2
3
1PPS
4
Host USB
Interface
DM
5
DP
6
PWR
7
8
9
10
E2
GPS_ANT
11
50 ohm Trace
12
NC/C7
33nH
NC/C6
5mil trace width
NC/L2
1uF
1nF
NC
GND
NC
VCC_MAIN
1PPS
NC
VBAT
UART_RX
USB_DM
UART_TX
USB_DP
DDC_SCL
USB_PWR
DDC_SDA
NC
NC
VCC_RF
NC
GND
NC
RF_IN
NC
GND
GND
24
C6
1uF
VCC_Main_Power(3.3V)
23
22
D2
21
R2
20
0 ohm
19
BT2
C7
1uF
18
17
UART_RX
16
15
UART_TX
Host UART
Interface
14
13
Option for Active
Antenna when internal RF power is bypassed
Note:
1.Trace impedance between Antenna and Pin11 should be 50 ohm.
2.Trace between Antenna and L2 inductor is recommended to be 5mil line width.
3.For L2 inductor selection, Impedance > 500 ohm @GPS frequency is better.
DDC_SCL
Host DDC_I2C
Interface
DDC_SDA
5 Performance Characteristics
Position and Velocity Accuracy
Accuracy
Position
2.5m in autonomous
2.0m in SBAS
Velocity
0.1 m/s
Altitude
50,000m
Velocity
500 m/s
Acceleration
<= 4g
Dynamic constrains
Dynamic Conditions
Acquisition time TTFF
Item
Description
Hot Start
1s
Warm Start
28s
Cold Start
29s
Sensitivity
Parameter
Description
Tracking & Navigation
-162 dBm
Acquisition
-148 dBm
6 PCB Layout Recommend
Recommended Layout Pad
PCB Layout Recommendations
Do not routing the other signal or power trace under the module board.
RF:
This pin receives signal of GPS analog via external active antenna. Note: 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.
7 Configuration Management
Configuration settings can be modified with configuration messages. The modified settings remain
effective until power-down or reset. If these settings have been stored in battery-backup RAM,
then the modified configuration will be retained, as long as the backup battery supply is not
interrupted.
Note that: If any new configuration needs to be done, pls refer to module Receiver Description
Including Protocol Specification.
8 Software Interface
The output NMEA (0183 v3.01) messages for the receiver are listed as below.
NMEA Command
Description
GGA
Time, position, and fix related data for a GPS receiver.
GLL
Latitude and longitude of present position, time of position fix and
status
GSA
GPS receiver operating mode, satellites used in the position
solution, and DOP values.
GSV
The number of GPS satellites in view satellite ID numbers,
elevation, azimuth, and SNR values.
RMC
Time, date, position, course and speed data provided by the GPS
receiver.
GGA - Global Positioning System Fixed Data
For example:
$GPGGA,161229.487,3723.24751,N,12158.34162,W,1,07,1.0,9.0,M,-34.2,M,,0000*18
Table 1
Name
Example
Description
Message ID
$GPGGA
GGA protocol header
UTC Time
161229.487
hhmmss.sss
Latitude
3723.24751
ddmm.mmmmm
N/S Indicator
N
N=north or S=south
Longitude
12158.34162
dddmm.mmmmm
E/W Indicator
W
E=east or W=west
Position Fix Indicator
1
See Table 1-1
Satellites Used
07
Range 0 to 12
HDOP
1.0
Horizontal Dilution of Precision
MSL Altitude
9.0
meters
Units
M
meters
Geoid Separation
-34.2
Geoid-to-ellipsoid separation.
Ellipsoid altitude=MSL Altitude + Geoid
Unit
meters
Separation
Units
M
Age of Diff. Corr.
meters
Null fields when DGPS is not used
Diff. Ref. Station ID
0000
Checksum
*18
<CR><LF>
second
End of message termination
Table 1-1
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
GLL - Geographic Position-Latitude/Longitude
For example:
$GPGLL,3723.24755,N,12158.34166,W,161229.487,A,A*41
Table2
Name
Example
Description
Message ID
$GPGLL
GLL protocol header
Latitude
3723.24755
ddmm.mmmmm
N/S Indicator
N
N=north or S=south
Longitude
12158.34166
dddmm.mmmmm
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,
Unit
E=DR
N=Output Data Not Valid
R= Coarse Position1
S=Simulator
Checksum
<CR><LF>
*41
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.
GSA - GNSS DOP and Active Satellites
For example:
$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,1.0,1.5*33
Table3
Name
Example
Description
Message ID
$GPGSA
GSA protocol header
Mode 1
A
See Table 3-1
Mode 2
3
See Table 3-2
Satellite Used1
07
Sv on Channel 1
1
02
Sv on Channel 2
Satellite Used
Unit
……
Satellite Used1
Sv on Channel 12
2
1.8
Position dilution of Precision
HDOP2
1.0
Horizontal dilution of Precision
2
1.5
Vertical dilution of Precision
PDOP
VDOP
Checksum
*33
<CR><LF>
End of message termination
1. Satellite used in solution.
2. Maximum DOP value reported is50. When 50 is reported, the actual DOP may be much
larger.
Table3-1
Value
Description
M
Manual-forced to operate in 2D or 3D
mode
A
Automatically switch in 2D or 3D mode
Table3-2
Value
Description
1
Fix Not Available
2
2D (<4 SVs used)
3
3D (>3 SVs used)
GSV - GNSS Satellites in View
For 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
Table4
Name
Example
Description
$GPGSV
GSV protocol header
2
Range 1 to 3
Message Number
1
Range 1 to 3
Satellites in View1
07
Satellite ID
07
Channel 1(Range 1 to 32)
Elevation
79
Channel 1(Maximum90)
degrees
Azimuth
048
Channel1(True, Range 0 to 359)
degrees
SNR(C/No)
42
Range 0 to 99,null when not tracking
dBHz
Message ID
1
Number of Messages
1
……
Unit
……
Satellite ID
27
Channel 4 (Range 1 to 32)
Elevation
27
Channel 4(Maximum90)
degrees
Azimuth
138
Channel4(True, Range 0 to 359)
degrees
SNR(C/No)
42
Range 0 to 99,null when not tracking
dBHz
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.
RMC - Recommended Minimum Specific GNSS Data
For example:
$GPRMC,161229.487,A,3723.24755,N,12158.34166,W,0.13,309.62,120598,,,A*10
Table5
Name
Example
Description
Message ID
$GPRMC
RMC protocol header
UTC Time
161229.487
hhmmss.sss
Status
A
A=data valid or V=data not valid
Latitude
3723.24755
ddmm.mmmmm
N/S Indicator
N
N=north or S=south
Longitude
12158.34166
dddmm.mmmmm
1
Unit
E/W Indicator
W
Speed Over Ground
0.13
Course Over Ground
309.62
True
Date
120598
ddmmyy
Magnetic Variation
E=east or W=west
knots
2
degrees
E=east or W=west
degrees
East/West Indicator2
E
E=east
Mode
A
A=Autonomous, D=DGPS,
E=DR
N=Output Data Not Valid
R= Coarse Position3
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 factoris met, then if that factor is not met the
solution will be marked as invalid.
2. 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.
9 Recommended Reflow Profile
High
quality,
low
defect
soldering
requires
identifying
the
optimum
temperature
profile for reflowing the solder paste. To have the correct profile assures components, boards,
and solder joints are not damaged and reliable solder connection is achievable. Profiles are
essential for establishing
the
profile
to
and
maintaining
processes.
You
must
be able
to
repeat
achieve process consistency. The heating and cooling rise rates must be
compatible with the solder paste
and
components.
The
amount
of
time
that
assembly is exposed to certain temperatures must first be defined and then maintained.
the
Revision History
Revision
Date
Name
Status/Comments
R1.0
02-Aug-2014
EddieX
Initial Release
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