RoyalTek REB-1722 Series Quick start guide

REB-1722 Operational Manual
REB-1722 Operational Manual
Version 0.2
2009/09/02
This document contains information highly confidential to RoyalTek Company LTD
(RoyalTek). It is provided for the sole purpose of the business discussions between
customer and RoyalTek and is covered under the terms of the applicable
Non-Disclosure Agreements. Disclosure of this information to other parties is
prohibited without the written consent of RoyalTek.
Prepared by RoyalTek Company LTD.
4F., No.188, Wen Hwa 2nd Rd., Kuei Shan,
Tao Yuan 333, Taiwan
TEL: [phone]
FAX: [phone]
http://www.royaltek.com/contact

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Content
1. Introduction...................................................................................................2
2. Software Interface.......................................................................................15
3. GPS Receiver User’s Tip ............................................................................21
4. Package Specification and Order Information ...........................................22
5. Contact Royaltek ........................................................................................23
6. Revision History .........................................................................................23

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1. Introduction
RoyalTek REB-1722 is powered by latest SiRF Star III low power single chip. It uses the proprietary
navigation technology to provide you with stable and accurate navigation data. The high sensitivity,
ultra low power consumption and miniature design is the best choice to be embedded in a device such
as portable navigation device, personal locator, Speed Camera detector and vehicle locator.
Product Features
20 parallel channels
SMT type with stamp holes
Ultra low power consumption
TCXO design
0.1 second reacquisition time
Small form factor with embedded SiRF Star III single chip technology.
NMEA-0183 compliant protocol/ customize protocol
Enhanced algorithm for navigation stability
Excellent sensitivity for urban canyon and foliage environments.
DGPS (WAAS, EGNOS) support
Build-in LNA and saw filter
1.1 Product Applications
Automotive navigation
Personal positioning and navigation
Marine navigation
Timing application

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1.2 Product Pictures
(1) REB-1722
(2) REB-1722 Interface board

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1.3 REB-1722 Series Block Diagram
System block diagram description:
a. External antenna.
b. 4 Mega bits flash memory.
c. 28 pin I/O pin.

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1.4 REB-1722 Technical Specification
Impedance：50Ω
No Function Specification
GPS receiver
1 Chipset SiRF Star III, GSC3f/LPx
(Digital, RF in a single package)
2 Frequency L1 1575.42MHz.
3 Code C.A. Code.
4 Channels 20 parallel
5 Chip Sensitivity Tracking: -159dBm.
6 Chip Cold start 35 sec @ open sky (Typical)
7 Chip Warm start 35 sec @ open sky (Typical)
8 Chip Hot start 1 sec @ open sky (Typical)
9 Reacquisition 0.1sec typical
10 Position accuracy 10meters at 2D RMS.
11 Maximum altitude 18000 m
12 Maximum velocity 515 m/s
13 Update rate Continuous operation: 1Hz
14 Protocol setup It shall store the protocol setup in the SRAM memory.
15 DGPS 1.WAAS, EGNOS
2.RTCM protocol
Interface
16 LNA 18dB Gain. (Typical)
17 I/O Pin 28pins
Mechanical requirements
18 Weight ≦3.5g
Power consumption
19 VCC DC +3.0~3.6V
20 V_BCKP DC +1.4~3.6V
21 Current Avg. ≦[email protected](without ext. antenna)
Environment
22 Temperature - Operating : -40 ~ 85℃
- Storage : -40 ~ 85℃
23 Humidity ≦95%

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1.5 Application Circuit
Reference schematic:
For example:
P.S. If active antenna short
=>Current >100mA , so U3 PIN3 OUT
open . So AADET0_N status is
high.
V_ANT_3V3
OK
AADET0_N
+
C1
0.1uF
OK
Active antenna status
VCC_3V3
Active antenna status
HIGH
VCC_3V3
V_ANT
Option 2
V_ANT
Micro
Active antenna select
2.7V~3.3 or 5V
VANT_3V3 or 5V
MAXIM / MAX4914BELT+T
/ uDFN
R9
3.3K
V_ANT_3V3
Active Antenna open detect
circuit
RESET
+
C6
33uF
R6
4.3K
R3 4.7 ohm
AADET0_N
STATUS
+
C4
33uF/6.3V
R5
3.3K
R1
100K
AADET0_N
V_ANT R5
3.3K
Processor
Active
VCC_3V3
U2
ZXCT1009
2 3
1Vsense+
Vsense-
Iout
Active antenna
select 3.3V
V_ANT
C7
0.01uF
U3
MAXIM MAX4914BELT+T
2
3
1
4
5
6
IN
OUT
N.C.
nFLAG
GND
ON
C10
0.1uF
R2
100K
Active antenna without
, or SHORT
Active antenna no
exist, or OPEN
LOW
V_ANT
R7 10K
Antenna
V_ANT_3V3
Active antenna
select 3.3 or 5V
R8
3.3K
(Serial)
HIGH
Q2
2SC2412K
3
2
1
VCC_RF V_BACKUP
C2
0.1uF
AADET0_N
STATUS
C7
0.01uF
VC_RF
V_ANT_3V3
Active antenna short
detect circuit
NOHM
2SC2412K
SC-59
C9
0.01uF
V_ANT_3V3
C3
0.1uF
NOHM
2SC2412K
SC-59
V_ANT_3V3
Q1
2SC2412K
3
2
1
Active antenna Normal
suggest circcuit
AADET0_N
U1
REB-1722
1
2
3
4
5
6
7
8
9
10
11
12
13
1415
16
17
18
19
20
21
22
23
24
25
26
27
28 SDA2
SCL2
TxD1
RxD1
NC
VCC
GND
VCC_OUT
CFG_COM1
RESET_N
V_BCKP
BOOT
GND
GNDGND
RF_IN
GND
VCC_RF
V_ANT
AADET0_N
NC
NC
NC
NC
NC
NC
EXTINT0
TIMEMARK
ZETEX
ZXCT1009
SOT23
(Optional)
LOW
Option 1
50 ohm trace
-
C8
1uF
R4 10K
Note:
(1) Ground Planes:
These pins (7,13, 14, 15, 17) should be connected to ground.
(2) Serial Interface:
(Ⅰ) The TxD1 pin is the serial output data (Default NMEA) .
(II) The RxD1 pin is the serial input data (Default NMEA) .
(3) Backup Battery:
When module is working, must to supply VCC (P6) and V_BCKP (P11) power at
the same time.
It’s recommended to connect a backup battery to V_BCKP pin and to enable the
warm start and hot start features of the GPS receiver.
If you use backup battery, should be adding a bypassing capacitor (0.01~10uF) at
V_BCKP pin. It can reduce noise and increase the stability.

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(4) RF_IN:
Connecting to the antenna has to be routed on the PCB. The transmission line must
to controlled impedance to connect RF_IN to the antenna or antenna connector of
your choice. (Impedance 50Ω)
(5) Power:
Connect VCC pin to DC+3.0~3.6V. The power supply must add bypassing capacitor
(10uF and 0.1uF).It can reduce the Noise from power supply and increase power
stability.
(6) Active antenna bias voltage:
The VCC_RF pin (pin 18) is provided voltage 2.85V. If you use active antenna, you
can connect this pin to V_ANT pin (pin 19) to provide bias voltage of active
antenna. The bias voltage will be through GPS_RF_IN pin to provide active antenna
bias voltage from VCC_RF pin.
If your bias voltage of active antenna isn’t 2.85V, you can input bias voltage to
V_ANT pin (pin 19) and input bias voltage of you need. The input bias voltage will
through GPS_RF_IN pin to provide active antenna bias voltage from V_ANT pin.
PS:
(1) The maximum power consumption of active antenna is about 85mW.
(2) The input gain ranges are 19~ 27dB.

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Recommend Layout PAD:
TOP View
Parameter Specification
A 22.4 +0.6/-0.1mm
B 17.0 ±0.1mm
C 3.0 ±0.2mm
D 2.55 +0.3/-0.1mm
E 1.1 ±0.1mm
F 3.80 ±0.1mm
G 1.10 ±0.1mm
H 2.85 +0.3/-.01mm

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Footprint and paste mask
TOP View

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1.6 Mechanical Layout

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1.7 Hardware interface
Interface Pin Number:

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Pin define:
Pin # Signal Name I/O Description Characteristics
1 SDA2 I/O
General
purpose I/O
VVVVV ILIH 86.00.3V-0.215.3 ≤≤≥≥
VVVVV OLOH 71.014.285.2 ≤≥≥
2 SCL2 I/O
General
purpose I/O
VVVVV ILIH 86.00.3V-0.215.3 ≤≤≥≥
VVVVV OLOH 71.014.285.2 ≤≥≥
3 TxD1 O Serial port A VVVVV OLOH 71.014.285.2 ≤≥≥
4 RxD1 I Serial port B VVVVV ILIH 86.00.3V-0.215.3 ≤≤≥≥
5 N.C. ~ N.C. None connector
6 VCC I
DC Supply
Voltage input DC +3.0~3.6V
7 GND ~ Ground Reference Ground
8 VCC_OUT O Connected to VCC, can open
9 CFG_COM1 I Config.Pin VVVVV ILIH 86.00.3V-0.215.3 ≤≤≥≥
10 RESET_N I
Reset (Active
low) 8.02.3VVIH VVIL <>
11 V_BCKP I
Backup voltage
supply 10uACurrent
3.6V~1.4DC
≤
+
+
12 BOOT I Boot mode VVVVV ILIH 86.00.3V-0.215.3 ≤≤≥≥
13 GND ~ Ground Reference Ground
14 GND ~ Ground Reference Ground
15 GND ~ Ground Reference Ground
16 RF_IN I
GPS Signal
input 50 Ω@1.57542GHz
17 GND ~ Ground Reference Ground
18 VCC_RF O
Supply Antenna
Bias voltage
DC +2.85V ±2%
Current < 20mA
19 V_ANT I
Active Antenna
Bias voltage
Receiving DC power supply for active
antenna bias.
20 AADET0_N I
Active Ant.
Detect
Detect Active Antenna=>”low”
VVVVV ILIH 86.00.3V-0.215.3 ≤≤≥≥
21~26 N.C. ~ N.C. None connector
27 EXTINT0 I Ext. Interrupt Internal pull-up resistor to 2.85V

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VVVVV ILIH 86.00.3V-0.215.3 ≤≤≥≥
28 TIMEMARK O
One pulse per
second VVVVV ILIH 86.00.3V-0.215.3 ≤≤≥≥
VCC_3V3 (DC 3.0~3.6V Power Input)
This is the DC power supply input pin for GPS system. It provides voltage to module.
GND
GND provides the ground.
Boot
Set this pin to high for programming flash.
RXD1
This is the main receiver channel and is used to receive software commands to the board
from SIRFdemo software or from user written software.
TXD1
This is the main transmitting channel and is used to output navigation and measurement
data to SiRFdemo or user written software.
GPS_RF_IN
This pin receives GPS analog signal. The line on the PCB between the antenna(or
antenna connector) has to be a controlled impedance line (Microstrip at 50Ω).
V_ANT_IN
This pin is reserved as external DC power supply input for active antenna.
1. If using external supply DC+3.3V~5V to Active antenna
2. If using connects to VCC_RF pin supply to Active antenna, pin 18 has to be
connected to pin 19
PS: The current must be ≦100mA and voltage ≦5.5V, if using external power supply.
VCC_RF_OUT
This pin can provide power 20mA@DC+2.85V for active antenna.

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Reset_N
This pin provides an active-low reset input to the board. It causes the board to reset and
start searching for satellites. If not utilized, it may be left open.
TIMEMARK
This pin provides one pulse-per-second output from the board, which is synchronized to
GPS time.
V_RTC_3V3 (Backup battery)
This is the battery backup input that powers the SRAM and RTC when main power is
removed. Typical current draw is 10uA.
The supply voltage should be between 1.4V and 3.6V.
GPIO Functions (SCL2, SDA2, CFG_COM1, AADET0_N, EXTINT0)
Several I/Os are connected to the digital interface connector for custom applications.
AADET0_N
AADET0_N is an input pin and it is used to report whether an external circuit has
detected an external antenna or not. Low means antenna has been detected. High means
no external antenna has been detected.

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2. Software Interface
NMEA Protocol
NMEA Output Messages: the Engine board outputs the following messages as shown in
Table 1:
Table 1 NMEA-0183 Output Messages
NMEA Record Description
GGA Global positioning system fixed data
GSA GNSS DOP and active satellites
GSV GNSS satellites in view
RMC Recommended minimum specific GNSS data
GLL Geographic position – latitude/longitude
VTG Course over ground and ground speed
GGA-Global Positioning System Fixed Data
Table 2 contains the values of the following example:
$GPGGA, 161229.487, 3723.2475, N, 12158.3416, W, 1, 07, 1.0, 9.0,
M, , , ,0000*18
Table 2 GGA Data Format
Name Example Units Description
Message ID $GPGGA GGA protocol header
UTC Position 161229.48
7
hhmmss.sss
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 12158.341
6
Dddmm.mmmm
E/W Indicator W E=east or W=west
Position Fix
Indicator
1 See Table 2-1
Satellites Used 07 Range 0 to 12
HDOP 1.0 Horizontal Dilution of
Precision
MSL Altitude 9.0 meters
Units M meters
Geoid Separation meters

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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 3 Position Fix Indicators
Value Description
0 Fix not available or invalid
1 GPS SPS Mode, fix valid
2 Differential GPS, SPS Mode, fix valid
3-5 Not Supported
6 Dead Reckoning Mode, fix valid
GSA-GNSS DOP and Active Satellites
Table 4 contains the values of the following example:
$GPGSA, A, 3, 07, 02, 26, 27, 09, 04, 15, , , , , , 1.8,1.0,1.5*33
Table 4 GSA Data Format
Name Example Units Description
Message ID $GPGSA GSA protocol header
Mode 1 A See Table 5
Mode 2 3 See Table 6
ID of Satellite
Used
07 Sv on Channel 1
ID of Satellite
Used
02 Sv on Channel 2
…. ….
ID of Satellite
Used
Sv on Channel 12
PDOP 1.8 Position Dilution of Precision
HDOP 1.0 Horizontal Dilution of Precision
VDOP 1.5 Vertical Dilution of Precision
Checksum *33

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＜CR＞＜LF
＞
End of message termination
Table 5 Mode 1
Value Description
M Manual-forced to operate in 2D or 3D mode
A Automatic-allowed to automatically switch 2D/3D
Table 6 Mode 2
Value Description
1 Fix not available
2 2D
3 3D
GSV-GNSS Satellites in View
Table 7 contains the values of 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 7 GSV Data Format
Name Exampl
e
Units Description
Message ID $GPGS
V
GSV protocol header
Total Number of
Messages1
2 Range 1 to 3
Messages
Number1
1 Range 1 to 3
Satellites in
View
07
Satellite ID 07 Channel 1(Range 1 to 32)
Elevation 79 degrees Channel 1(Range 00 to 90)
Azimuth 048 degrees Channel 1(True, Range 000 to 359)
SNR (C/No) 42 dBHz Channel 1(Range 0 to 99, null when not
tracking)

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Satellite ID 27 Channel 4(Range 01 to 32)
Elevation 27 degrees Channel 4(Range 00 to 90)
Azimuth 138 degrees Channel 4(True, Range 000 to 359)
SNR (C/No) 42 dB-Hz Channel 4(Range 00 to 99, null when not
tracking)
Checksum *71
＜CR＞＜LF＞End of message termination
1Depending on the number of satellites tracked multiple messages of GSV data
may be required.
RMC-Recommended Minimum Specific GNSS Data
Table 8 contains the values of the following example:
$GPRMC, 161229.487, A, 3723.2475, N, 12158.3416, W, 0.13, 309.62, 120598, ,*10
Table 8 RMC Data Format
Name Example Units Description
Message ID $GPRMC RMC protocol header
UTC Time 161229.487 hhmmss.sss
Status A A=data valid or V=data not valid
Latitude 3723.2475 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 True
Course Over
Ground
309.62 degrees
Date 120598 ddmmyy
Magnetic
Variation
degrees
Variation sense E=east or W=west (Not shown)
Mode A A=Autonomous, D=DGPS,
E=DR
Checksum *10
<CR><LF> End of message termination

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VTG-Course Over Ground and Ground Speed
Table 9 contains the values of the following example:
$GPVTG,79.65,T,,M,2.69,N,5.0,K,A*38
Table 9 VTG Data Format
Name Example Units Description
Message ID $GPVTG VTG protocol header
Course over
rgound
79.65 degrees Measured heading
Reference T True
Course over
ground
degrees Measured heading
Reference M Magnetic
Speed over
ground
2.69 Knots Measured speed
Units N Knots
Speed over
ground
5.0 Km/hr Measured speed
Units K Kilometer per hour
Mode A A-autonomous, D=DGPS,
E=DR
Checksum *38
<CR><LF> End of message termination
GLL-Geographic Position – Latitude/Longitude
Table 10 contains the values of the following example:
$GPGLL,2503.6319,N,12136.0099,E,053740.000,A,A*52