RoyalTek RET-3570LP User Manual

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

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RET-3570LP User Manual

Content

1. INTRODUCTION................................................................................................................ 1

RODUCT FEATURES ......................................................................................................... 1

1.1 P

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 R

ECOMMENDED 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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RET-3570LP User Manual

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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RET-3570LP User Manual

1.3 Product Pictures and Interface board

(1) RET-3570LP

(2) RET-3570LP Interface board

Pin 1

The interface board pin definition

J2 CONNECTOR

Pin # Signal Name I/O Description Characteristics

1 N.C
2 N.C

3 Battery I

4 VCC I DC Supply Voltage input

5 Reset I Reset (Active low)

6-10 N.C

11 TXA O Serial port A

12 RXA I Serial port A

13 N.C

14 TXB O Serial port B

Backup voltage supply

10uACurrent

≤

±10%

3.6V

2.5DC

DC +3.3V

>

IH

CMOS TTL level

CMOS TTL Level

CMOS TTL level

8.0 ; 2.3V V

IL

VV

VVVVV

715.0 85.2375.2 ≤

OLOH

OLOH

VVVVV

855.00.3V- 15.3995.1

ILIH

VVVVV

715.0 85.2375.2 ≤

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≤

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≤

15 RXB I Serial port B

16 N.C

17 Boot I Boot mode

18 GND G Ground

RET-3570LP User Manual

ILIH

CMOS TTL Level

ILIH

VVVVV

855.00.3V- 15.3995.1 ≤≤

VVVVV

855.00.3V- 15.3995.1 ≤≤

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

6 TMC_3V3 Power supply for

TMC section

Switch:
0: Low 1: DC 3.3V output
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

RET-3570LP User Manual

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RL=

=

∆

RET-3570LP User Manual

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
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

14 Update rate Continuous operation: 1Hz
15 Testability It shall be able to be tested by SiRF test IV and single channel

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

35 sec

Duty cycle

≦ 34%. (Variable)

simulator.

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:

1= ;

mVV

RF

pre-emphasis; usTC

deem

; KHzf 5.22

75=

; KHzf 1

= ; No

mod

Output voltage:
Min= 55 mV
Typ= 66 m V
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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RET-3570LP User Manual

℃

26 Operating temperature
27 Humidity

-40 ~ 85

≦95%

1.6 Application Circuit

Reference:

Note:

(1) Ground Planes:

RET3570LP GPS receiver needs two different ground planes.

These pins(13

These pins(2

(2) Serial Interface:

(I)The TXA pin is recommended to pull up (10K

serial data

(II)

(III) The RXB pin is recommended to connect to serial resistance(220Ω), if the DGPS

(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,

、15、16、18) should be connected to analog ground.

、10、30) should be connected to digital ground.

Ω). It can increase the stability of

.

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.

output is used.

If the DGPS output is not used, it won’t connect anything.

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.

RET-3570LP User Manual

(Impedance 50

(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 50

(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.

Ω)

Ω)

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(220

is used.

If GPIO function is not used, it won’t connect anything.

Ω), if the GPIO function

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1.7 Recommended layout PAD

RET-3570LP User Manual

Top Vi e w

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1.8 Mechanical Layout

Unit: mm

RET-3570LP User Manual

P17

P31

P16

P1

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:

RET-3570LP User Manual

Pin # Signal Name I/O Description Characteristics

1 V_GPS_3V3 I DC Supply Voltage input

2 GND G Ground Reference Ground

3 BOOT I Boot mode

4 RXA I Serial port A

5 TXA O Serial port A

6 TXB O Serial port B

7 RXB I Serial port B

8 N.C

9 RF_ON O

Indicates power state of RF
part

10 GND G Ground Reference Ground

11 AUDIO_R O Audio right channel output

12 AUDIO_L O Audio Left channel output

13 GND G Ground Reference Ground

14 FM_RF_IN

I FM antenna input

DC +3.3V±5%

0 ; 85.2

OLOH

V Output voltage 66mV(typical) ~75mV(max)

AFL

R Output resistance 50Ω(min) ~ 100Ω

AFL

V Output voltage 66mV(typical) ~75mV(max)

AFL

R Output resistance 50Ω(min) ~ 100Ω

AFL

FM antenna input

VVVVV

855.00.3V- 15.3995.1 ≤≤

ILIH

ILIH

OLOH

OLOH

ILIH

VVVV

VVVVV

855.00.3V- 15.3995.1 ≤≤

VVVVV

715.0 85.2375.2 ≤

VVVVV

715.0 85.2375.2 ≤

VVVV

855.00.3V- 15.3995.1 ≤≤

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RET-3570LP User Manual

(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

Receiving DC power supply for active antenna bias.

voltage

20 VCC_RF_OUT O Supply Antenna Bias

voltage

O

VV

Current<30mA

%585.2

21 V_RTC_3V3 I Backup voltage supply

22 RESET I Reset (Active low)

2.5DC

>

3.6V

10uACurrent

≤

ILIH

23 N.C

24 N.C

25 GPIO4 I/O General purpose I/O

26 GPIO0 I/O General purpose I/O

27 N.C

28 N.C

29 PPS O One pulse per second

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.

8.0 ; 2.3 V VVV

VVVVVV

855.00.3- 15.3995.1 ≤≤

ILIH

OLOH

ILIH

OLOH

715.0 85.2375.2 ≤

OLOH

715.0 85.2375.2 ≤

VVVVV

VVVVVV

855.00.3- 15.3995.1 ≤≤

715.0 85.2375.2 ≤

VVVVV

VVVVV

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.

RET-3570LP User Manual

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 50

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 50

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

VCC_RF_OUT

This pin can provide power 30mA@2.85V 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

≦100mA and voltage ≦12V, if external power supply is used.

Ω).

Ω).

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

RET-3570LP User Manual

Several I/Os are connected to the digital interface connector for customer

applications.

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RET-3570LP User Manual

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

Diff. Ref. Station ID 0000

Checksum *18

＜CR＞＜LF＞

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Null fields when DGPS is not
used

End of message termination

14

RET-3570LP User Manual

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

Value Description

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2 2D

3 3D

Table 6 Mode 2

15

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

A Automatic-allowed to automatically switch 2D/3D

RET-3570LP User Manual

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

Messages

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(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＞

1

Depending on the number of satellites tracked multiple messages of GSV data may be required.

1

2 Range 1 to 3

End of message termination

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

RET-3570LP User Manual

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RET-3570LP User Manual

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.

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RET-3570 Operational Manual

4. Package Specification and Order Information

Shipment Method: Tape and reel

5. Contact Royaltek



Contact: [e-mail]

Headquarter:

Address: 8F, 256 Yang Guang Street, Neihu Chiu, Taipei, Taiwan

Tel: [phone]

Fax: [phone]

Web Site: http://www.royaltek.com

Web Site Customer Service: http://www.royaltek.com/contact

6. Revision History

Title RET-3570LP

Doc Type User Manual

Revision
Number

0.1 20076/03/26 May Chen Initial Release

0.2 2007/03/28 May Chen Remove RTCM Protocol

1.0 2007/03/29 May Chen Final Release

1.1 2007/07/09 May Chen Modify the chipset TTFF @open sky

Date Author Change notice

Copyright © 2005-2006, RoyalTek Company Ltd.

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