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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REB-1722 Operational Manual
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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REB-1722 Operational Manual
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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REB-1722 Operational Manual
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