VPN2525S [ETC]
GPS 接收模块; GPS接收模块
ETC 
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PARTS NAME: VPN2525S
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1 Product applications
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Handheld GPS receiver applications
Automotive applications
Marine navigation applications
Aviation applications
Timing applications
2 Technical specifications
2.1 Electrical Characteristics
2.1.1 General
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Size:
25.4 x 25.4 x 3mm (L x B x H)
Fully shielded
Casing:
TCXO
±0.5 ppm
FLASH Memory
Operating voltage:
Power consumption:
Power management:
on-chip 4 Mbit FLASH and 1 Mbit SRAM.
+3.3 V DC ±5%
105mW (continuous mode)
Adaptive TricklePowerTM(ATP)*
Push-to-Fix(PTF) *
Advanced Power management (APM) *
-40 to +85℃(operation, transportation and storage).
RXD1/TXD1:
-
Temperature range:
Protocol:
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NMEA 38400 baud, Msg.: GLL, GGA, RMC, GSV,
GSA, VTG
8 data bits, no parity, 1 stop bit
L1, 1575.42 MHz
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Frequency:
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VPN2525S
A1
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C/A code:
1.023 MHz chip rate
Channels:
20
Max. update rate:
Processor speed:
Data bus:
1 Hz
6, 12.5, 25 and 49 MHz
16 bit
2.1.2 Accuracy
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Position
Autonomous: 10 meters CEP without SA
SBAS:
<5 meter
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Velocity
Time
0.1 meters/second, without SA
1 microsecond synchronized to GPS time
2.1.3 DGPS Accuracy
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Position
Velocity
1 to 5 meter, typical
0.05 meters/second, typical
2.1.4 Datum
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WGS-84
2.1.5 Time to First Position
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GSM
<20 sec., average
<20 sec., average
<16 sec., average
<18 sec., average
<1 sec., average
<42 sec., average
3G
CDMA
Hot start
Hot start (open sky)
Cold start
2.1.6 Sensitivity*
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GSM
15dBHz
15dBHz
15dBHz
13dBHz
15dBHz
30dBHz
3G
CDMA
Tracking
Hot start
Cold start
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*
The sensitivity value is specified at the correlator. On a VPN2525S Evaluation
Receiver using GSW3 firmware with the supplied antenna, 32 dBHz is
equivalent to -159 dBm. Other board and antenna characteristics will vary.
2.1.7 Dynamic Conditions
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Altitude
Velocity
Acceleration
Jerk
18,000 meters (60,000 feet) max.
<515 meters/second (1000 knots) max.
4 g, max
20 meters/second3, max
2.1.8 DC Power
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Main power
+ 3.3 V DC ±5%
+ 1.5 V DC
Core power
Continuous mode
Backup battery power
55 mA at 3.3 V DC
+3 V DC ±5%
2.1.9 Serial port
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Electrical interface
Protocol messages
Two full duplex serial communication, CMOS.
SiRF binary and NMEA-0183 with a baud rate
selection.
SiRF binary – position, velocity, altitude, status
and control NMEA - GGA, GLL, GSA, GSV, RMC,
VTG
2.1.10 Time – 1PPS Pulse
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Level
CMOS
Pulse duration
Time reference
Measurements
100 ms
At the pulse positive edge
Aligned to GPS second, ±microsecond
3 HARDWARE INTERFACE AND CONFIGURATION SIGNALS
3.1 Interfaces (pin – out) of the VPN2525S
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Name
A3
Pin
Name
I/O
Description
Level
1
VCC
GND
I
Supply voltage
3.3 V
DC ±5%
2
3
4
5
6
7
8
Digital ground
BOOT-SELECT
RXD1
I
I
Boots in update mode, if high
Serial Data Input A
CMOS
CMOS
CMOS
CMOS
CMOS
TXD1
O
O
I
Serial Data Output A
TXD2
Serial Data Output B
RXD2
Serial Data Input B
SPI_EN
I
Control-line for production test. Do
not use, leave it open.
Control output for baseband
processor. Do not use, leave it open.
Digital ground
9
VCCGSP3
O
CMOS
10 GND
11 RF_GND
12 RF_GND
13 RF_GND
14 RF_GND
15 RF_GND
16 RF_GND
17 RF_IN
Analog grounds
I
GPS signal from connected antenna 50 ohms @
1.575 GHz
18 RF_GND
19 V_ANT
Analog ground
I
O
I
Power supply for active antenna
Supply voltage of RF section
Power for RTC and SRAM
up to
+12 V DC
+2.85 V DC/
max. 25mA
+3 V
20 VCCRF
21 V_BAT
DC ±5%
CMOS
22 RESET_N
I
Resets the unit if active LOW
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VPN2525S
A4
Pin
Name
I/O
Description
Level
3.3 V
23 VCC
I
Supply voltage
DC ±5%
24 SPI_DATA
25 NADC_D
26 SPI_CLK
27 GP100
O
I
Control-lines for production test. Do
not use, leave it open.
CMOS
I
I/O General propose input/output
I/O Alternate function is Odometer
interface for SiRFDRive (GSW3-
version). Internal pull-down resistor.
Default input at reset. Do not use,
leave it open.
CMOS
CMOS
28 Odometer
29 T-MARK
30 GND
O
One pulse per second
Digital ground
CMOS
3.2 Configuration and timing signals
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RESET_N：This pin provides an active-low reset input to the board. It causes the
board to reset and to start searching for satellites. If not utilized, this input pin may
be left open.
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T-MARK：This pin provides 1 pulse per second output from the board, which is
synchronized to within 1 mocrosecond of GPS time. The output is a CMOS level
signal.
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BOOT_SELECT：Set this Pin to high (+3.3 V DC) for reprogramming the flash of
the VPN2525S family (for instance updating a new firmware for the VPN2525S).
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3.3 Serial communication signals
The board supports two full duplex serial channels. All serial connections are at CMOS
level. If you need different voltage levels, use appropriate level shifter, (e.g. MAX 3232
from Maxim) in order to obtain RS232 compatible signal levels. All supported variable
baud rates can be controlled from the appropriate screens in SiRFdemo software.
You can directly communicate with a PC serial port.
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RXD1：This is the main receiving channel and is used to receive software
commands to the board from SiRFdemo software or from user written software.
RXD2：This is the auxiliary receiving channel and is used to input differential
corrections to the board to enable DGPS navigation.
TXD1：This is the main transmitting channel and is used to output navigation
and measurement data to SiRFdemo or user written software.
TXD2：For user’s application.
3.4 DC input signals
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VCC：This is the main DC power supply for 3.3 V ±5 % powered board DP310
family.
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RF_IN：Active antennas have an integrated low-noise amplifier. They can be
directly connected to this pin (RF_IN). If an active antenna is connected to
RF_IN, the integrated low-noise amplifier of the antenna needs to be supplied
with the correct voltage through pin V_ANT.
Caution: Do not connect or disconnect the antenna while the DP310 family is
running.
Caution: The RF_IN is always fed from the input voltage on the V_ANT. Do not
use any input voltage on this pin.
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V_ANT: This pin is an input and reserved for an external DC power supply for an
active antenna.
The antenna bias for an external active antenna can be provided in two ways
to pin V_ANT.
In order to use a 5 V or 12 V active GPS antenna, the V_ANT has to be
connected to 5 V, 12 V external power supply, respectively.
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The other possibility is available when you connect the VCCRF output (which
provides 2.85 V) to V_ANT, so that an antenna with 2.85 V supply voltage can
be used.
Hint: The input voltage on the V_ANT should be chosen in according to the
antenna to be used.
Note: The GPS receiver VPN2525S family has to be connected to an active
GPS
antenna with a max. current 25 mA.
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VCCRF: This pin is an output, which provides +2.85 V DC, and can be connected
to the V_ANT, to supply the connected GPS antenna (2.85 V active antenna).
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4 SOFTWARE INTERFACE
The SUNSHINE VPN2525S family supports NMEA-0183 and SiRF binary protocols. A
short description of these protocols is provided herein.
4.1 SiRF binary data message
Table 1 lists the messages for the SiRF output.
Hex
0x02
0x03
0x04
0x06
ASCII
2
Name
Measured Navigation Data
True Tracker Data
Measured Tracking Data
SW Version
Description
Position, velocity and time
Not implemented
3
4
Satellite and C/No information
Receiver software
6
0x07
0x08
7
Clock Status
Current clock status
8
50 BPS Subframe Data
Throughput
Standard ICD format
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x1C
0x1D
0x1E
0x1F
0xFF
9
Navigation complete data
Error coding for message failure
Successful request
10
11
12
13
14
15
16
17
18
19
20
28
29
30
31
Error ID
Command Acknowledgement
Command No Acknowledgement Unsuccessful request
Visible List
Auto Output
Almanac Data
Response to Poll
Ephemeris Data
Response to Poll
Test Mode 1
For use with SiRFtest (Test Mode 1)
Received from DGPS broadcast
CPU ON/OFF (Trickle Power)
Response to Poll
Differential Corrections
Ok To Send
Navigation Parameters
Test Mode 2
Additional test data (Test Mode 2)
Measurement Data
Nav. Lib. Measurement Data
Nav. Lib. DGPS Data
Nav. Lib. SV State Data
Nav. Lib. Initialization Data
Differential GPS Data
Satellite State Data
Initialization Data
255 Development Data
Various status messages
Table 1: SiRF Output Messages
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Table 2 lists the message list for the SiRF input messages.
Hex
0x55
0x80
ASCII
Name
Description
85
Transmit Serial Message
User definable message
Receiver initialization and associated
Parameters
Enable NMEA message, output rate
and baud rate
Sends an existing almanac file to the
Receiver
128 Initialize Data Source
129 Switch to NMEA Protocol
130 Set Almanac (upload)
0x81
0x82
0x84
0x85
132 Software Version (Poll)
133 DGPS Source Control
Polls for the loaded software version
DGPS correction source and beacon
receiver information
0x86
0x87
0x88
0x89
0x8A
0x8B
0x8C
0x8D
0x8E
0x8F
0x90
0x91
134 Set Main Serial Port
135 Switch Protocol
136 Mode Control
137 DOP Mask Control
138 DGPS Mode
Baud rate, data bits, stop bits and parity
Obsolete
Navigation mode configuration
DOP mask selection and parameters
DGPS mode selection and timeout value
Elevation tracking and navigation masks
Power tracking and navigation masks
Not implemented
139 Elevation Mask
140 Power Mask
141 Editing Residual
142
Steady-State Detection -not used Not implemented
143 Static Navigation
144 Poll Clock Status (Poll)
145 Set DGPS Serial Port
Configuration for static operation
Polls the clock status
DGPS port baud rate, data bits, stop
bits and parity
0x92
0x93
0x94
0x95
0x96
0x97
0x98
0xA5
146 Poll Almanac
Polls for almanac data
147 Poll Ephemeris
Polls for ephemeris data
148 Flash Update
On the fly software update
Sends an existing ephemeris to the receiver
149 Set Ephemeris (upload)
150 Switch Operating Mode
Test mode selection, SV ID and period
Push to fix mode, duty cycle and on time
151
Set Trickle Power Parameters
152 Poll Navigation Parameters
165 Set UART Configuration
Polls for the current navigation parameters
Protocol selection, baud rate, data
bits, stop bits and parity
0xA6
0xA7
0xB6
166 Set Message Rate
SiRF binary message output rate
167
Low Power Acquisition Parameters Low power configuration parameters
Obsolete
182 Set UART Configuration
Table 2: SiRF Input Messages
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4.2 NMEA data message
The SiRFstarlll evaluation receiver is capable of outputting data in the NMEA-0183
format as defined by the National Marine Electronics Association (NMEA), Standard
for Interfacing Marine Electronic Devices, Version 2.20, January 1,1997.
4.2.1 NMEA output messages
Table 3 lists all NMEA output messages supported by SiRFstarlll evaluation receiver
and a brief description.
Option
GGA
GLL
Description
Time, position and fix type data.
Latitude, longitude, UTC time of position fix and status.
GPS receiver operation mode, satellites used in the position solution
and DOP values.
GSA
The number of GPS satellites in view satellite ID numbers, elevation,
azimuth and SNR values.
GSV
MSS
(This message can be switched on via SiRFdemo software) Sign-to-
noise ratio, signal strength, frequency and bit rate from a radio-beacon
receiver.
RMC
VTG
Time, date, position, course and speed data.
Course and speed information relative to the ground.
Table 3: MEA Output Messages
4.2.2 NMEA input messages
Message
Set Serial Port
MID1
100
101
102
103
Description
Set PORT A parameters and protocol
Parameters required for start using X/Y/Z2
Navigation Initialization
Set DGPS Port
Set PORT B parameters for DGPS input
Query standard NMEA message and/or
set output rate
Query/Rate Control
Parameters required for start using
Lat/Lon/Alt3
LLA Navigation Initialization
104
Development Data On/Off
MSK Receiver Interface
105
Development Data messages On/Off
Command message to a MSK
Radio-beacon receiver
MSK
Table 4: MEA Input Messages
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1. Message Identification (MID).
2. Input co-ordinates must be WGS84.
3. Input co-ordinates must be WGS84.
Note: NMEA input messages 100 to 105 are SiRF proprietary NMEA messages. The
MSK NMEA string is as defined by the NMEA 0183 standard.
4.2.3 Transport Message
Start Sequence
$PSRF<MID>1
Payload
Data2
Checksum
CKSUM3
End Sequence
<CR> <LF>4
1. Message Identifier consisting of three numeric characters. Input messages begin
at MID 100.
2. Message specific data. Refer to a specific message section for <data>…<data>
definition.
3. CHECKSUM is a two-hex character checksum as defined in the NMEA specification.
Use of checksums is required on all input messages.
4. Each message is terminated using Carriage Return (CR) Line Feed (LF) which is
\r\n which is hex 0D 0A. Because \r\n are not printable ASCII characters, they are
omitted from the example strings, but must be sent to terminate the message and
cause the receiver to process that input message.
CheckSum
The checksum is 15-bit checksum of the bytes in the payload data. The following
pseudo defines the algorithm used.
Let message to be the array of bytes to be sent by the transport.
Let msgLen be the number of bytes in the message array to be transmitted.
Clearly to say, the string over which the checksum has to be calculated is between
the “$” and “*” (without characters “$” and “*”).
Index = first
checkSum = 0
while index < msgLen
checkSum = checkSum + message[index]
checkSum = checkSum AND (215 – 1)
Note: All fields in all proprietary NMEA messages are required, none are optional.
All NMEA messages are comma delimited.
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5 LAYOUT RECOMMENDATION
5.1 Ground planes
VPN2525S GPS receiver needs two different ground planes. The pins RF_GND shall be
connected to analog ground, the pins GND to digital ground.
The two ground planes shall be separated:
5.2 RF connection
The family VPN2525S GPS receiver is designed to be functional by using either a passive
patch antenna or an antenna connector with standard RF cables. In order to make
a properly RF connection, the user has to connect the antenna points or the pins of
the connector to the RF pin.
Recommendations for layout, and soldering.
Please note that, the dimension tolerance is ±0.1mm.
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Consider for a long time in the soldering zone (with temperature higher than 180℃)
has to be kept as short as possible to prevent component and substrate damages.
Peak temperature must not exceed 240℃. VPN2525S family are able to withstand twice
the previous recommended reflow profile in order to be compatible with a double reflow
when SMDs are mounted on both sides of the PCB. A maximum of two soldering reflows
are allowed for these packages. The use of a no clean flux is highly recommended to
avoid any cleaning operation. In order to prevent any bump cracks, ultrasonic cleaning
methods are not recommended.
6 FIRST STEPS TO MAKE IT WORK
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Antenna: The antenna connection is the most critical part of PCB routing. Before
placing the VPN2525S on the PCB, secure that the connection to the antenna signals
is routed. In order to make it properly functional, a control impedance line has to
connect the RF_IN signal with antenna feed points or antenna connector,
respectively. The routing on the PCB depends on your choice.
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Power: The input power is also very important as far as the minimum and maximum
voltage is concerned. The power supply of VPN2525S family has to be a single
voltage
source of VCC at 3.3 VDC ±5%. The power supply has to be able to provide a
sufficient current which typically rises to 200 mA. Please, connect GND pins to
ground, and connect the lines which supply the VCC pin to +3.3 V, properly. If they
are correctly connected, the board is full powered and the unit begins obtaining its
position fix.
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Serial Interface: The VPN2525S family provides two serial interfaces. Each interface
is
provided with two wires the RXD1 and TXD1 support line and ground for the first
serial interface (port A) and RXD2 and TXD2 support line and ground for the second
serial interface (port B). These pins are 3.3 V CMOS compatible. In order to use
different voltage levels, an appropriate level shifter has to be used.
E.g. in order to provide RS232 compatible levels use the 3 V compatible MAX3232
transceiver from Maxim or others based on the required levels. The GPS data will
be transmitted through port A (first serial port), if an active antenna is connected,
which has a good view to sky (no obstacle). You can use port B (second serial port)
to feed in DGPS correction data. Pull-up (100kΩ) unused SDI inputs.
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Active Antenna Bias Voltage: The output voltage at the antenna cable can be used
to power the bias voltage of the antenna, provided can make sure that the antenna
runs down to 2.7 V bias voltage and the current does not exceed 20 mA.
Backup Battery: In case of a power interruption on pin VCC the real-time clock and
backed-up SRAM are continually supplied through V_BAT. The voltage at this pin
has to be +3 V DC ±5%. If you do not use a backup battery, connect this pin to
GND or leave it open.
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The quickest way to get first results with the VPN2525S is to use the VPN2525S
Evaluation
board together with the program SiRFdemo.
The Evaluation board contains:
- Evaluation Box
- VPN2525S sample with soldered antenna cable
- Power supply (AC/DC adapter, Type FW738/05, Output 5VDC 1.3A)
- Active GPS antenna (FAL-ANT-3)
- RS232 level shifter
- RS232 cable to your computer
The Evaluation board with contained components are not included in the deliver
package. In order to have one, the user of VPN2525S family has to purchase it.
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