RoyalTek RET-3570LP User manual

RoyalTek Confidential
RET-3570LP User Manual
RET-3570LP User Manual
Version 1.1
2007/07/09
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.
8F, 256 Yang Guang Street, Neihu Chiu,Taipei, Taiwan
TEL: [phone]
FAX: [phone]
http://www.royaltek.com/contact

RoyalTek Confidential
RET-3570LP User Manual
Content
1. INTRODUCTION................................................................................................................ 1
1.1 PRODUCT FEATURES ......................................................................................................... 1
1.2 PRODUCT APPLICATIONS ................................................................................................... 1
1.3 PRODUCT PICTURES AND INTERFACE BOARD .................................................................... 2
1.4 SYSTEM BLOCK DIAGRAM ................................................................................................ 4
1.5 TECHNICAL SPECIFICATION ............................................................................................... 5
1.6 APPLICATION CIRCUIT....................................................................................................... 6
1.7 RECOMMENDED LAYOUT PAD.......................................................................................... 8
1.8 MECHANICAL LAYOUT...................................................................................................... 9
1.9 TEST SOFTWARE SPECIFICATION........................................................................................ 9
1.10 HARDWARE INTERFACE................................................................................................. 10
2. SOFTWARE INTERFACE ............................................................................................... 14
3. GPS RECEIVER USER’S TIP ......................................................................................... 18
4. PACKAGE SPECIFICATION AND ORDER INFORMATION .................................. 19
5. CONTACT ROYALTEK ................................................................................................... 19
6. REVISION HISTORY....................................................................................................... 19

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1. Introduction
RoyalTek RET-3570LP small form factor board is the newest generation of RoyalTek
GPS plus TMC module. TMC can deliver real-time traffic and travel information to
drivers. The driver can be notified of problems on the planned route, at the same time,
TMC calculates and provide an alternative route to help driver avoid the incident. The
combo module is powered by latest SiRF Star III single chip and RoyalTek
proprietary navigation technology that provides you with stable and accurate
navigation data. The smallest form factor and miniature design is the best choice to be
embedded in a device such as portable navigation device, personal locator, and speed
camera detector and vehicle locator.
1.1 Product Features
 20 parallel channels
 TMC embedded
 TMC frequency 87.5MHz--108MHz
 SMT type with stamp holes
 TCXO design
 0.1 second reacquisition time
 Small form factor with embedded SiRF Star III single chip technology.
 NMEA-0183 compliant protocol/ Royaltek TMC protocol
 Enhanced algorithm for navigation stability
 Excellent sensitivity for urban canyon and foliage environments.
 DGPS (WAAS, EGNOS ) support
 Auto recovery while RTC crashes
1.2 Product Applications
 Automotive navigation
 Personal positioning and navigation
 Marine navigation
 Timing application

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1.3 Product Pictures and Interface board
(1) RET-3570LP
(2) RET-3570LP Interface board
The interface board pin definition
J2 CONNECTOR
Pin # Signal Name I/O Description Characteristics
1 N.C
2 N.C
3 Battery I
Backup voltage supply
10uACurrent
3.6V
~
2.5DC
≤
+
+
4 VCC I DC Supply Voltage input DC +3.3V±10%
5 Reset I Reset (Active low) 8.0;2.3VVIH VVIL
<
>
6-10 N.C
11 TXA O Serial port A VVVVV OLOH 715.085.2375.2 ≤
≤
≤
CMOS TTL level
12 RXA I Serial port A VVVVV ILIH 855.00.3V-15.3995.1
≤
≤
≤
≤
CMOS TTL Level
13 N.C
14 TXB O Serial port B VVVVV OLOH 715.085.2375.2 ≤
≤
≤
CMOS TTL level
Pin 1

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15 RXB I Serial port B VVVVV ILIH 855.00.3V-15.3995.1 ≤≤
≤
≤
CMOS TTL Level
16 N.C
17 Boot I Boot mode VVVVV ILIH 855.00.3V-15.3995.1 ≤≤
≤
≤
18 GND G Ground
19 N.C
20 N.C
Switch U4
Pin # Signal Name 0/1 Description Characteristics
1 GPIO-0 GPIO input/output Switch:
0: Low 1:High CMOS TTL Level
2 GPIO-4 GPIO input/output Switch:
0: Low 1:High CMOS TTL Level
3 GPIO-15
(N.C for
RET-3570)
GPIO input/output
(N.C for RET-3570)
Switch:
0: Low 1:High CMOS TTL Level
(N.C for RET-3570)
4 PPS PPS output Switch:
0: Low 1:PPS output
5 GPS_3V3 Power supply for
GPS section
Switch:
0: Low 1: DC 3.3V output
6 TMC_3V3 Power supply for
TMC section
Switch:
0: Low 1: DC 3.3V output
7 N.C
8 RF_Bias RF_Bias voltage
switch
0: open. No voltage provide antenna.
1:Provide 2.85V to antenna.
Connector:
Pin # Description Characteristics
J1 GPS RF Connector 1575.42MHz
J5 FM RF Connector 87.5MHz~108MHz
J4 Stereo Jack Audio output
(Right and Left channel)
RoyalTek Evaluation Kit REV-2000 for RET-3570 LP
(Please refer to RoyalTek Evaluation Kit REV-2000 for RET-3570 Operational Manual for more
information.)

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1.4 System Block Diagram
System block diagram description:
(1) External antenna.
(2) 4 Mega bits flash memory
(3) 31 pin I/O pin

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1.5 Technical Specification
Impedance：50Ω
No Function Specification
GPS receiver
1 Chipset SiRF Star III, GSC3f/LP
(Digital, RF in a single package)
2 Frequency L1 1575.42MHz.
3 Code C.A. Code.
4 Channels 20 parallel
5 Chipset Sensitivity -159dBm.
6 Chipset Cold start @open sky 35 sec
7 Chipset Warm start @open
sky
35 sec
8 Chipset Hot start @open sky 1 sec
9 Reacquisition 0.1sec typical
10 Position accuracy 10meters at 2D RMS.
11 Maximum altitude 18000 m
12 Maximum velocity 514 m/s
13 Trickle power mode Duty cycle ≦34%. (Variable)
14 Update rate Continuous operation: 1Hz
15 Testability It shall be able to be tested by SiRF test IV and single channel
simulator.
16 Protocol setup It shall store the protocol setup in the SRAM memory.
17 DGPS WAAS, EGNOS
Interface
18 LNA No LNA
19 I/O Pin 31pin
TMC/RDS receiver
20 Frequency 87.5~108MHz. US/Europe
21 RDS sensitivity 24.7uV typical
Δf=22.5kHz, fAF = 1kHz,L=R, f RDS=1.2kHz,
De-emphasis= 50us,
Block Quality Rate ≧85%
22 Right and Left audio output
voltage
Conditions:
mVVRF 1
=
;
R
L
=
;KHzf 5.22
=
∆
;KHzf 1
mod =; No
pre-emphasis; usTCdeem 75
=
Output voltage:
Min= 55 mV
Typ=66 mV
Max=75mV
Mechanical requirements
23 Weight ≦3.5g
Power consumption
24 Vcc DC 3.3 ±5%
25 Current
GPS:
Fix mode Current 36mA average.
RDS Current: 15mA typical
Environment

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26 Operating temperature -40 ~ 85℃
27 Humidity ≦95%
1.6 Application Circuit
Reference:
Note:
(1) Ground Planes:
RET3570LP GPS receiver needs two different ground planes.
These pins(13、15、16、18) should be connected to analog ground.
These pins(2、10、30) should be connected to digital ground.
(2) Serial Interface:
(I)The TXA pin is recommended to pull up (10KΩ). It can increase the stability of
serial data.
(II) The TXB pin is recommended to connect to serial resistance(220Ω) and pull
up (10KΩ), if use the DGPS output.
If the DGPS output is not used, it won’t connect anything.
(III) The RXB pin is recommended to connect to serial resistance(220Ω), if the DGPS
output is used.
If the DGPS output is not used, it won’t connect anything.
(3) Backup Battery:
It’s recommended to connect a backup battery to V_RTC_3V3 in order to enable the warm
start and hot start features of the GPS receiver. If you don’t intend to use a backup battery,
connect this pin to GND or float it.
If you use a backup battery, you should add a bypassing capacitor (10uF) at V_RTC_3V3
pin to reduce noise and increase the stability.
(4) GPS_RF_IN:
Connecting to the antenna has to be routed on the PCB. The transmission line must control

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impedance to connect RF_IN to the antenna or any antenna connectors that you prefer.
(Impedance 50Ω)
(5) FM_RF_IN:
Connecting to the antenna has to be routed on the PCB. The transmission line must control
impedance to connect FM_RF_IN to the antenna or any antenna connectors that you prefer.
(Impedance 50Ω)
(6) Power:
Connect V_GPS_3V3 and V_TMC_3V3 pin to DC 3.3V. The power supply must add a
bypassing capacitor (10uF and 1uF) to reduce the noise from power supply and increase
power stability.
(7) Active antenna bias voltage:
The Vcc_RF_OUT pin (pin 20) provides voltage 2.85V. If you use an active antenna, you
can connect this pin to V_ANT_IN pin (pin 19) for providing bias voltage of an active
antenna. The bias voltage will run through GPS_RF_IN pin to provide active antenna bias
voltage from Vcc_RF_OUT pin.
If your bias voltage of an active antenna isn’t 2.85V, you can input bias voltage that you
need to V_ANT_IN pin (pin 19). The input bias voltage will run through GPS_RF_IN pin
to provide active antenna bias voltage from V_ANT_IN pin.
PS:
(Ⅰ). The maximum power consumption of active antenna is around 85mW.
(Ⅱ). The input gain ranges from 12 to 26dB.
(8) GPIO:
The GPIO pin is recommended to connect to serial resistance(220Ω), if the GPIO function
is used.
If GPIO function is not used, it won’t connect anything.

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1.7 Recommended layout PAD
Top View

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1.8 Mechanical Layout
Unit:mm
P1
P16
P31
P17
1.9 Test Software Specification
No Function Specification
1 Clock offset 88000Hz≦Measurement≦104000Hz
2 Clock Drift Measurement≦200Hz
3 C/No Hi Power Mean Measurement≧38dB
4 C/No Hi Power Sigma Measurement≦2dB
5 Bit Sync Measurement≦5 Sec
6 Frame Sync Measurement≦28 Sec
7 Phase Error Measurement≦0.22°

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1.10 Hardware interface
Interface Pin Number:
Pin # Signal Name I/O Description Characteristics
1 V_GPS_3V3 I DC Supply Voltage input DC +3.3V±5%
2 GND G Ground Reference Ground
3 BOOT I Boot mode VVVVV ILIH 855.00.3V-15.3995.1 ≤≤
≤
≤
4 RXA I Serial port A VVVVV ILIH 855.00.3V-15.3995.1 ≤≤
≤
≤
5 TXA O Serial port A VVVVV OLOH 715.085.2375.2 ≤
≤
≤
6 TXB O Serial port B VVVVV OLOH 715.085.2375.2 ≤
≤
≤
7 RXB I Serial port B VVVV ILIH 855.00.3V-15.3995.1 ≤≤
≤
≤
8 N.C
9 RF_ON O
Indicates power state of RF
part
VVVV OLOH 0;85.2
=
=
10 GND G Ground Reference Ground
11 AUDIO_R O Audio right channel output AFL
VOutput voltage 66mV(typical) ~75mV(max)
AFL
ROutput resistance 50Ω(min) ~ 100Ω
12 AUDIO_L O Audio Left channel output AFL
VOutput voltage 66mV(typical) ~75mV(max)
AFL
ROutput resistance 50Ω(min) ~ 100Ω
13 GND G Ground Reference Ground
14 FM_RF_IN I FM antenna input FM antenna input

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(Input impedance 50Ω; Frequency 87.5~108MHz)
15 GND G Ground Reference Ground
16 GND G Ground Reference Ground
17 GPS_RF_IN I GPS Signal input 50 Ω@1.57542GHz
18 GND G Ground Reference Ground
19 V_ANT_IN I
Active Antenna Bias
voltage Receiving DC power supply for active antenna bias.
20 VCC_RF_OUT O Supply Antenna Bias
voltage
%585.2
±
=
VVO
Current<30mA
21 V_RTC_3V3 I Backup voltage supply
10uACurrent
3.6V
~
2.5DC
≤
+
+
22 RESET I Reset (Active low) 8.0;2.3V VVV ILIH
<
>
23 N.C
24 N.C
25 GPIO4 I/O General purpose I/O VVVVVV ILIH 855.00.3-15.3995.1 ≤≤
≤
≤
VVVVV OLOH 715.085.2375.2 ≤
≤
≤
26 GPIO0 I/O General purpose I/O VVVVVV ILIH 855.00.3-15.3995.1 ≤≤
≤
≤
VVVVV OLOH 715.085.2375.2 ≤
≤
≤
27 N.C
28 N.C
29 PPS O One pulse per second VVVVV OLOH 715.085.2375.2 ≤
≤
≤
30 GND G Ground Reference Ground
31 V_TMC_3V3 I DC Supply Voltage input DC +3.3V±5%
V_GPS_3V3 (+3.3V DC power Input)
This is the DC power supply input pin for GPS system. It provides voltage for module.
GND
GND provides the ground.
BOOT
Set this pin to high for programming flash.
RXA
This is the main receiver channel. The main function is to receive software commands from
SIRFdemo software or other user’s application.
RXB
This is the auxiliary receiving channel. The main function is to input differential corrections,
then deliver them to the board for DGPS navigation.

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TXA
This is the main transmitting channel and is used to output navigation and measurement data
to SiRFdemo or from user’s application.
TXB
For user’s application.(Not current use).
RF_ON
This pin indicates the status of RF voltage.
V_TMC_3V3 (+3.3V DC power Input)
This is the DC power supply input pin for TMC function. It provides voltage for TMC section
of the module.
AUDIO_R
This pin is the function of audio right channel output.
AUDIO_L
This pin is the function of audio left channel output.
FM_RF_IN
This pin can receive FM analog signal. The trace on the PCB from the antenna(or antenna
connector) has to be controlled impedance line (Micro strip at 50Ω).
GPS_RF_IN
This pin can receive GPS analog signal. The trace on the PCB between the antenna(or antenna
connector) has to be a controlled impedance line (Micro strip at 50Ω).
V_ANT_IN
This pin is reserved as external DC power supply input for an active antenna.
If using 2.85V active antenna, the pin 20 has to be connected to pin 19.
If using 3.3V or 5V active antenna, this pin has to be connected to 3.3V or 5V power supply.
PS: The current must be ≦100mA and voltage ≦12V, if external power supply is used.
VCC_RF_OUT
This pin can provide power [email protected] for an active antenna.
RESET
This pin provides an active-low reset input for the board. It causes that the board resets and
starts to search for satellites. If RESET pin is not used, it won’t connect anything.
PPS
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.
V_RTC_3V3 (Backup battery)
This is the battery backup input that powers the SRAM and RTC when the main power is
removed. Typical current draw is 10uA.

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The supply voltage should be between 2.5V and 3.6V.
GPIO Functions
Several I/Os are connected to the digital interface connector for customer
applications.

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2. Software Interface
NMEA V3.0 Protocol
Its output signal level is TTL: 38400 bps (default), 8 bit data, 1 stop bit and no parity. It supports the
following NMEA-0183
Messages: GGA, GSA, GSV, RMC .
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
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 161229.487 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 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
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

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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 GPS PPS Mode, fix valid
6 Dead Reckoning Mode, fix valid
GSA-GNSS DOP and Active Satellites
Table 2-4 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 4-2
Mode 2 3 See Table 4-1
Satellite Used 07 Sv on Channel 1
Satellite Used 02 Sv on Channel 2
…. ….
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
＜CR＞＜LF＞End of message termination
Table 5 Mode 1
Value Description
1 Fix not available
2 2D
3 3D
Table 6 Mode 2
Value Description

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M Manual-forced to operate in 2D or 3D mode
A Automatic-allowed to automatically switch 2D/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 GGA Data Format
Name Example Units Description
Message ID $GPGSV GSV protocol header
Number of
Messages1
2 Range 1 to 3
Messages Number11 Range 1 to 3
Satellites in View 07
Satellite ID 07 Channel 1(Range 1 to 32)
Elevation 79 degrees Channel 1(Maximum 90)
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(Maximum 90)
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
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 GGA Data Format
Name Example Units Description
Message ID $GPRMC RMC protocol header
UTC Position 161229.487 hhmmss.sss
Status A A=data valid or V=data not valid

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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 Variation degrees E=east or W=west
Mode A A=Autonomous, D=DGPS, E=DR
Checksum *10

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3. GPS Receiver User’s Tip
A. GPS signal will be affected by weather and environment conditions, so it is recommended to use
the GPS receiver under less shielding environments to ensure GPS receiver has better receiving
performance.
B. When GPS receiver is moving, it will prolong the time to fix the position, so it is recommended
to wait for the satellite signals locked at a fixed point when first power-on the GPS receiver to
ensure to lock the GPS signal at the shortest time.
C. The following situation will affect the GPS receiving performance:
i. Solar control filmed windows.
ii. Metal shielded, such as umbrella, or in vehicle.
iii. Among high buildings.
iv. Under bridges or tunnels.
v. Under high voltage cables or near by radio wave sources, such as mobile phone base
stations.
vi. Bad or heavy cloudy weather.
D. If the satellite signals can not be locked or encounter receiving problem (while in the urban area),
the following steps are suggested:
i. Please plug the external active antenna into GPS receiver and put the antenna on outdoor or
the roof of the vehicle for better receiving performance.
ii. Move to another open space or reposition GPS receiver toward the direction with less
blockage.
iii. Move the GPS receiver away from the interferences resources.
iv. Wait until the weather condition is improved.
E. While a GPS with a backup battery, the GPS receiver can fix a position immediately at next
power-on if the build-in backup battery is full-recharged.