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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.
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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 ...........................
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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
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RET-3570LP User Manual 1.3 Product Pictures and Interface board (1) RET-3570LP Pin 1 (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 Backup voltage supply 3 Battery I DC + 2.5 ~ +3.6V Current ≤10uA 4 VCC I DC Supply Voltage input DC +3.3V ±10% V > 2.3V ; V < 0.8V 5 Reset I Reset (Active low) IH IL 6-10 N.C 2.375V ≤ V ≤ 2.85V V ≤ 0.715V 11 TXA O
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RET-3570LP User Manual 1.995V ≤ V ≤ 3.15V - 0.3V ≤ V ≤ 0.855V 15 RXB I Serial port B IH IL CMOS TTL Level 16 N.C 1.995V ≤ V ≤ 3.15V - 0.3V ≤ V ≤ 0.855V 17 Boot I Boot mode IH IL 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 GPIO input/output Switch: (N.C for (N.C
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RET-3570LP User Manual 1.4 System Block Diagram System block diagram description: (1) External antenna. (2) 4 Mega bits flash memory (3) 31 pin I/O pin RoyalTek Confidential 4
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RET-3570LP User Manual 1.5 Technical Specification Impedance ：50 Ω 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 35 sec sky 8 Chipset Hot start @open sky 1 sec 9 Reacquisition 0.1sec typical 10 Position accuracy 10meters at 2D RMS. 11 Maximum altit
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RET-3570LP User Manual 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 (10K Ω). It can increase the stability of serial data. (II) The TXB pin is recommended to
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RET-3570LP User Manual impedance to connect RF_IN to the antenna or any antenna connectors that you prefer. (Impedance 50 Ω) (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 Ω) (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 powe
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RET-3570LP User Manual 1.7 Recommended layout PAD Top View RoyalTek Confidential 8
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RET-3570LP User Manual 1.8 Mechanical Layout Unit: mm P1 7 P1 6 P3 1 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 ° RoyalTek Confidential 9
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RET-3570LP User Manual 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 1.995V ≤ V ≤ 3.15V - 0.3V ≤ V ≤ 0.855V 3 BOOT I Boot mode IH IL 1.995V ≤ V ≤ 3.15V - 0.3V ≤ V ≤ 0.855V 4 RXA I Serial port A IH IL 2.375V ≤ V ≤ 2.85V V ≤ 0.715V 5 TXA O Serial port A OH OL 2.375V ≤ V ≤ 2.85V V ≤ 0.715V 6
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RET-3570LP User Manual (Input impedance 50 Ω; 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 Active Antenna Bias 19 V_ANT_IN I Receiving DC power supply for active antenna bias. voltage V = 2.85V ± 5% 20 VCC_RF_OUT O Supply Antenna Bias O voltage Current<30mA 21 V_RTC_3V3 I Backup voltage supply DC + 2.5 ~ +3.6V Current ≤10uA V > 2.3V ; V < 0.8V 22
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RET-3570LP User Manual 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
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RET-3570LP User Manual 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. RoyalTek Confidential 13
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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 R
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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 ExampleUnits Description Message ID $GPGSA
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RET-3570LP User Manual 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 ExampleUnits Description Message ID $GPGSV GSV protocol header Number of 2 Range 1 to 3 1 Mes
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RET-3570LP User Manual 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 RoyalTek Confidential 17
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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 t
