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

RoyalTek Confidential
1
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

RoyalTek Confidential
2
RET-3570LP User Manual
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

RoyalTek Confidential
3
RET-3570LP User Manual
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.)

RoyalTek Confidential
4
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
5
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
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

RoyalTek Confidential
6
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 (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

RoyalTek Confidential
7
RET-3570LP User Manual
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.

RoyalTek Confidential
8
RET-3570LP User Manual
1.7 Recommended layout PAD
Top View