Multi-Band GNSS Raw Data Module
TAU1302
Datasheet V1.6
www.allystar.com
TAU1302 Datasheet
V1.6
Notice, Statement and Copyright
ALLYSTAR Technology offers this document as a service to its customers, to support application and
engineering efforts that use the products designed by ALLYSTAR Technology. Products and specifications
discussed herein are for reference purposes only. Performance characteristics listed in this document do not
constitute a warranty or guarantee of product performance.
ALLYSTAR Technology assumes no liability or responsibility for any claims or damages arising out of the use
of this document, or from the use of integrated circuits based on this document, including, but not limited to
claims or damages based on infringement of patents, copyrights or other intellectual property rights.
This document contains proprietary technical information which is the property of ALLYSTAR Technology,
copying of this document and giving it to others and using or communication of the contents thereof, are
forbidden without express authority. Offenders are liable to the payment of damages. ALLYSTAR Technology
reserves the right to make changes in its products, specifications and other information at any time without
notice.
For more recent documents, please visit www.allystar.com.
Copyright © Allystar Technology (Shenzhen) Co., Ltd. 2021. All rights reserved.
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TAU1302 Datasheet
V1.6
About the Document
Basic info
Document applies to
TAU1302
Document type
Datasheet
Revision and date
V1.6/2021-11
Product status
Mass production
Product status description
In development
Objective specification. Revision may be released in later status.
Engineering sample
Product specifications tested on early. Revision may be released in later status.
Preliminary
Mass production
Confidential 5
Product specifications come from small production. Revision may be released in
later status.
Final product specification to mass market.
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Page 3 of 24
TAU1302 Datasheet
V1.6
TABLE OF CONTENT
1
SYSTEM OVERVIEW ............................................................... 6
1.1
1.2
1.3
1.4
1.5
1.6
2
Overview .......................................................................................................... 6
Features .......................................................................................................... 6
Module photo .................................................................................................. 6
Block diagram ................................................................................................. 7
Specifications ................................................................................................. 7
GNSS Reception .............................................................................................. 8
PIN DESCRIPTION .................................................................. 9
2.1
2.2
3
Pin assignment ............................................................................................... 9
Detailed pin descriptions .............................................................................. 10
ELECTRICAL CHARACTERISTICS .......................................... 11
3.1
3.2
Absolute Maximum Rating ........................................................................... 11
IO Characteristics ......................................................................................... 11
3.2.1
3.2.2
3.2.3
3.3
DC Characteristics ........................................................................................ 12
3.3.1
3.3.2
4
Connecting power ......................................................................................... 13
Power on/off Sequence ................................................................................ 13
4.2.1
4.2.2
4.3
4.4
4.5
MECHANICAL SPECIFICATION .............................................. 16
REFERENCE DESIGN ............................................................. 17
Minimal design.............................................................................................. 17
PCB Footprint Reference .............................................................................. 18
Layout Notes ................................................................................................. 18
PRODUCT PACKAGING AND HANDLING ................................ 19
7.1
Packaging ..................................................................................................... 19
7.1.1
7.1.2
7.1.3
7.2
7.3
Packaging Notes .............................................................................................................. 19
Tape and Reel ................................................................................................................... 19
Shipment Packaging ........................................................................................................ 20
Storage .......................................................................................................... 21
ESD Handling ................................................................................................ 21
7.3.1
7.3.2
7.3.3
8
Initial system power on .................................................................................................... 13
Main power supply off/on in application ........................................................................ 14
Antenna design ............................................................................................. 14
Reset and mode control ............................................................................... 14
Serial interfaces ............................................................................................ 15
6.1
6.2
6.3
7
Operating Conditions ....................................................................................................... 12
Power Consumption ......................................................................................................... 12
HARDWARE DESCRIPTION ................................................... 13
4.1
4.2
5
6
PRRSTX and PRTRG ......................................................................................................... 11
USB I/O .............................................................................................................................. 11
Others ................................................................................................................................ 12
ESD Handling Precautions ............................................................................................... 21
ESD protection measures ................................................................................................ 21
Moisture sensitivity level ................................................................................................. 21
LABELING AND ORDERING INFORMATION ............................ 22
8.1
8.2
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Labeling ......................................................................................................... 22
Ordering info ................................................................................................. 22
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TAU1302 Datasheet
V1.6
9 RELATED DOCUMENTS ......................................................... 23
10 REVISION HISTORY .............................................................. 23
List of tables
Table 1 TAU1302 ............................................................................................................................................. 6
Table 2 Specifications .................................................................................................................................... 7
Table 3 GNSS reception table ........................................................................................................................ 8
Table 4 Detailed pin descriptions ................................................................................................................ 10
Table 5 Absolute rating ................................................................................................................................. 11
Table 6 PRRSTX and PRTRG ........................................................................................................................ 11
Table 7 USB signal ........................................................................................................................................ 11
Table 8 Others ............................................................................................................................................... 12
Table 9 Operating conditions ....................................................................................................................... 12
Table 10 Power consumption ...................................................................................................................... 12
Table 11 Default message ............................................................................................................................ 15
Table 12 Dimensions .................................................................................................................................... 16
Table 13 Packing hierarchy .......................................................................................................................... 19
Table 14 Labeling content ............................................................................................................................ 22
Table 15 Ordering codes ............................................................................................................................... 22
List of figures
Figure 1 TAU1302 module photo ................................................................................................................... 6
Figure 2 Block diagram ................................................................................................................................... 7
Figure 3 Pin assignment (top view) ............................................................................................................... 9
Figure 4 Initial system power on sequence ................................................................................................ 13
Figure 5 Main power on sequence ............................................................................................................... 14
Figure 6 Dimensions ..................................................................................................................................... 16
Figure 7 Minimal application diagram ......................................................................................................... 17
Figure 8 PCB Footprint Reference ................................................................................................................ 18
Figure 9 Tape dimensions ............................................................................................................................ 19
Figure 10 Reel dimensions ........................................................................................................................... 20
Figure 11 Packaging ..................................................................................................................................... 20
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Page 5 of 24
V1.6
TAU1302 Datasheet
1
SYSTEM OVERVIEW
1.1
Overview
TAU1302 is a high-performance dual-band GNSS raw data module, which is based on the state of
the art CYNOSURE III architecture. It supports GPS, BeiDou, GLONASS, Galileo, and QZSS. TAU1302
integrates efficient power management architecture, while providing high precision, high sensitivity
and low power GNSS solutions which make it suitable for high precision industries, like precision
agriculture, surveying and mapping, deformation monitoring, Unmanned Aerial Vehicle (UAV), etc.
1.2
Features
Compact size for high precision industry
Concurrent reception of multi-band GNSS signals by three RF settings:
Option A: L1&L5
Option B: L1&L2
Option C: L1&L6
State-of-art low power consumption
Supports multi-band multi-system high-precision raw data output, easy for 3rd party integration
Highly integrated module, the best cost-effective high precision GNSS solution
Table 1 TAU1302
T= TCXO
1.3
○=Supported
upon request with special FW
Module photo
Figure 1 TAU1302 module photo
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Page 6 of 24
Automotive
SPI
Professional
USB
T
Grade
Standard
I2C
Centimeter
UART
Sub-meter
Raw Data
Meter
Oscillator
D-GNSS
Accuracy
Data logging
Interface
Programmable (flash)
Galileo
Built-in LNA
GLONASS
D
NavIC
BDS
TAU1302-1216A00
GPS
Product
Features
Band (S/D/T)
GNSS
TAU1302 Datasheet
1.4
V1.6
Block diagram
13
GND
GND
12
14
INT0
RF_IN
11
15
FWD/SPICK
GND
10
16
SPIDO/CAN_TX
ANT_BIAS
9
17
SPIDI/
CAN_RX
PRRSTX
8
HD9310
18
I2C_SDA
32.768kHz
AVDUSB
7
19
I2C_SCL
USB_DP
6
20
UOUT0
USB_DN
5
SPEED_CAR
4
PPS
3
PRTRG
2
SPICX
1
21
UIN0
22
AVDD_BAK
23
VDD
24
GND
2.2uH
TCXO
TAU1302
Figure 2 Block diagram
1.5
Specifications
Table 2 Specifications
Parameter
GNSS tracking channel
Specification
40 channels
GPS/QZSS: L1C/A, L2C, L5, L6
GNSS Reception
BDS: B1I, B2I, B2a, B3I
GLONASS: L1OF, L2OF
Galileo: E1, E5a, E6
Update rate
Position accuracy[1]
Velocity & Time accuracy
Time to First Fix(TTFF)
Sensitivity
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Maximum 10 Hz
GNSS
5ms
0.8*AVDD_BAK(min.)
External Reset（PRRSTX）
Figure 4 Initial system power on sequence
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TAU1302 Datasheet
V1.6
4.2.2 Main power supply off/on in application
If application intends to shut down main power supply (VDD) while keep backup power supply
(AVDD_BAK) alive to save backup data, the following rules should be applied:
External reset (PRRSTX) must be active when main power supply is under power off. In this case,
external reset must be hold active more than 5ms after main power supply resumes to minimum
operating voltage. Main power on sequence in application is illustrated in Figure 5.
AVDD_BAK(min.)
Backup Power Supply
10ms
0.8*VDD(min.)
Main Power Supply
>5ms
0.8*AVDD_BAK(min.)
External Reset（PRRSTX）
Figure 5 Main power on sequence
4.3
Antenna design
There isn’t built-in LNA and SAW in the GNSS module. It is recommended to use an active antenna
with gain less than 50dB and noise figure less than 1.5dB. The module has built-in short circuit
detection and open circuit detection functions, which can detect the status of normal connection,
and send out antenna status prompt message in NMEA data.
Short circuit protection
»
The module includes internal short circuit antenna detection. Once an overcurrent is
detected at the ANT_BIAS port, the module will restrict the current output automatically to
protect from damage.
Open circuit detection
»
The module can detect an open circuit in the antenna. Users can judge it from antenna
status messages.
4.4
Reset and mode control
The operation mode of GNSS module is controlled by PRRSTX (nRESET) and PRTRG (BOOT) pin.
While the module works in normal operation, leave PRRSTX and PRTRG pins floating if there is no
upgrading or reset demands, or others.
Keep PRTRG pin floating during system power-up or the external reset (PRRSTX from low to high),
and the module will enter User Normal Mode.
When the module powers up or PRRSTX from low to high, the module will execute an external reset.
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TAU1302 Datasheet
V1.6
(If the power for AVDD_BAK is always on, the external reset will not affect the ephemeris data in the
backup domain)
Drive PRTRG pin to low or connect PRTRG to GND directly (not by pull-down resistance) during
system power-up or the external reset (PRRSTX from low to high), and the system enters BootROM
Command Mode at PRTRG pin being released from low to floating state, and ready for firmware
upgrading command.
When connecting PRRSTX and PRTRG to any host IO, DO NOT use the pull-up or pull-down
resistance.
4.5
Serial interfaces
Table 11 Default message
Interface
Settings
115200 baud, 8 data bits, no parity bit, 1 stop bit
UART output
Configured to transmit both NMEA and HD Binary protocols, but only the
following NMEA (and no HD Binary sentence) messages have been activated at
start-up: GGA, GSA, GSV, RMC, ZDA, TXT-ANT
115200 baud, 8 data bits, no parity bit, 1 stop bit, autobauding disabled
UART input
Automatically accepts following protocols without need of explicit configuration:
HD binary sentence, NMEA, RTCM
The GNSS receiver supports interleaved HD binary and NMEA messages.
Timepulse
(1Hz Nav)
*
1 pulse per second, synchronized at rising edge, pulse length 100ms
Refer to GNSS_Protocol_Specification for information about other settings.
When the module is applied to the specific application, users can shut off the main power in order to
further reduce the power consumption. To avoid the high level in serial interface influencing the
normal operation, it is highly suggested to cut off the serial port when shut off the main power.
Otherwise, please set the serial port to input mode or high impedance state with pull-down resistor.
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TAU1302 Datasheet
5
V1.6
MECHANICAL SPECIFICATION
Figure 6 Dimensions
Table 12 Dimensions
Symbol
Min.(mm)
Typ.(mm)
Max.(mm)
A
12.0
12.2
12.4
B
15.8
16.0
16.2
C
2.2
2.4
2.6
D
0.9
1.0
1.3
E
1.0
1.1
1.2
F
2.9
3.0
3.1
H
--
0.8
--
K
0.4
0.5
0.6
M
0.8
0.9
1.0
N
0.7
0.8
0.9
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V1.6
TAU1302 Datasheet
6
REFERENCE DESIGN
6.1
Minimal design
This is a minimal design for a TAU1302 GNSS module. The 82nH inductor is used only when an
active antenna is connected, and no need with a passive antenna. The characteristic impedance
from RF_IN pin to the antenna connector should be 50Ω.
13
GND
GND
12
14
INT0
RF_IN
11
15
FWD/SPICK
GND
10
16
SPIDO/CAN_TX
ANT_BIAS
9
17
SPIDI/CAN_RX
PRRSTX
8
ACTIVE/PASSIVE ANT
50Ω
82nH
USED WITH ACTIVE ANT ONLY
nRESET
TAU1302
18
I2C_SDA
19
AVDUSB
7
I2C_SCL
USB_DP
6
USB_DN
5
SPEED_CAR
4
PPS
3
TXD
20
UOUT0
RXD
21
UIN0
22
AVDD_BAK
23
VDD
PRTRG
2
GND
SPICX
1
VDD3V3
Backup BATT
(Optional)
10uF
24
PPS
BOOT
Figure 7 Minimal application diagram
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TAU1302 Datasheet
6.2
V1.6
PCB Footprint Reference
0.8mm
0.8mm
1.0mm
16.0mm
3.0mm
1.1mm
1.0mm
12.2mm
Figure 8 PCB Footprint Reference
6.3
Layout Notes
(1) A decoupling capacitor should be placed close to VDD pin of the module, and the width of power
routing should be more than 0.5mm.
(2) The width of RF routing between RF port to antenna interface should be wider than 0.2mm. The
characteristic impedance of RF routing between RF port to antenna interface should be controlled
to 50Ω.
(3) It is recommended that the routing from RF port to antenna interface refers to the second layer,
and no routing are recommended on the layer.
(4) Do not place the module close to any EMI source, like antenna, RF routing, DC/DC or power
conductor, clock signal or other high-frequency switching signal, etc.
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TAU1302 Datasheet
7
PRODUCT PACKAGING AND HANDLING
7.1
Packaging
V1.6
7.1.1 Packaging Notes
TAU1302 is a Moisture Sensitive Device (MSD) and Electrostatic Sensitive Device (ESD). During the
packing and shipping, it is strictly required to take appropriate MSD handling instructions and
precautions. The table below shows the general packing hierarchy for the standard shipment.
Table 13 Packing hierarchy
Module
Reel
Sealed bag
Shipping carton
7.1.2 Tape and Reel
TAU1302 is delivered as hermetically sealed, reeled tapes in order to enable efficient production,
production lot set-up and tear-down. The figure below shows the tape dimensions.
Figure 9 Tape dimensions
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TAU1302 Datasheet
V1.6
TAU1302 is deliverable in quantities of 1000pcs on a reel. The figure below shows the dimensions
of reel for TAU1302.
Figure 10 Reel dimensions
7.1.3 Shipment Packaging
The reels of TAU1302 are packed in the sealed bags and shipped by shipping cartons. Up to five
sealed bags (5000pcs in total) can be packed in one shipping carton.
Figure 11 Packaging
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TAU1302 Datasheet
7.2
V1.6
Storage
In order to prevent moisture intake and protect against electrostatic discharge, TAU1302 is
packaged together with a humidity indicator card and desiccant to absorb humidity.
7.3
ESD Handling
7.3.1 ESD Handling Precautions
TAU1302 which contains highly sensitive electronic circuitry is an Electrostatic-sensitive Device
(ESD). Observe precautions for handling! Failure to observe these precautions may result in severe
damage to the GNSS module!
Unless there is a galvanic coupling between the local GND (i.e. the workbench) and the PCB
GND, then the first point of contact when handling the PCB must always be between the local
GND and PCB GND.
Before mounting an antenna patch, connect ground of the device.
When handling the RF pin, do not come into contact with any charged capacitors and be careful
when contacting materials that can develop charges (e.g. patch antenna ~10 pF, coax cable ~50
– 80 pF/m, soldering iron, …)
To prevent electrostatic discharge through the RF input, do not touch any exposed antenna area.
If there is any risk that such exposed antenna area is touched in non ESD protected work area,
implement proper ESD protection measures in the design.
When soldering RF connectors and patch antennas to the receiver’s RF pin, make sure to use an
ESD safe soldering iron (tip).
7.3.2 ESD protection measures
The GNSS positioning module is sensitive to static electricity. Whenever handling it, particular care
must be exercised to reduce the risk of electrostatic charges. In addition to standard ESD safety
practices, the following measures should be taken into account.
Adds ESD Diodes to the RF input part to prevent electrostatics discharge.
Do not touch any exposed antenna area.
Adds ESD Diodes to the UART interface.
7.3.3 Moisture sensitivity level
The Moisture Sensitivity Level (MSL) of the GNSS module is MSL4.
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TAU1302 Datasheet
8
V1.6
LABELING AND ORDERING INFORMATION
Labeling and ordering information help customers get more about Allystar products.
8.1
Labeling
Table 14 Labeling content
Symbol
Explanation
Instance
TAUXXXX
Product model
TAU1302
1216 represents the product size.
1216A00A
A00 means the product type.
Second A refers to sales area code. Different code
for different sales area.
aaayybbbssss
8.2
Serial number
1216A00
E (for Europe market)
355190010001
Ordering info
Table 15 Ordering codes
Ordering No.
TAU1302-1216A00E
TAU1302-1216A00H
TAU1302-1216A00R
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Product
Concurrent GNSS LCC Module, TCXO, ROM, 12.2*16mm, 1000 pieces/reel,
Europe market.
Concurrent GNSS LCC Module, TCXO, ROM, 12.2*16mm, 1000 pieces/reel,
India market.
Concurrent GNSS LCC Module, TCXO, ROM, 12.2*16mm, 1000 pieces/reel,
Russia market.
Copyright © ALLYSTAR
Page 22 of 24
TAU1302 Datasheet
9
V1.6
RELATED DOCUMENTS
10
[1]
Satrack User Manual
[2]
Allystar Common Commands
[3]
Recommended Reflow Profile
[4]
GNSS_Protocol_Specification
REVISION HISTORY
Revision
Date
Reviser
V1.0
2019-09-09
Vita Wu
Status / Comments
First released
Updates dimensions;
Adds packaging info;
V1.1
2019-10-14
Vita Wu
Updates backup voltage descriptions and reference design
diagram.
Adds PCB packaging info in Section 6.
V1.2
2019-12-9
Vita Wu
V1.3
2020-02
Vita Wu
Updates antenna gain in Section 4.2;
Updates Section 6.3;
Updates Galileo E6 support in section 1.6 GNSS Reception;
Deletes SBAS support.
Fixes I/O type of I2C pin to be I/O.
Fixes I/O type of INT0 pin to be I.
Updates MSL.
Updates 39nH inductor to be 82nH in minimal design.
Fixes ICCRX2 power consumption to be 34mA in Table 9.
V1.4
2020-12
Vita Wu
Improves mechanical specification.
Updates description about short circuit protection in Section
4.3.
Improves layout notes in Section 6.3.
Clarifies power on/off sequence in Section 4.2.
Deletes 1K resistor in the minimal design diagram.
Localization.
Improves wording.
Adds labeling and ordering info.
Details default settings.
V1.5
2021-07
Vita Wu
Adds related document list.
Adds document info section.
Updates operative VDD to 2.0 ~3.6V.
Adds ANT_BIAS output current and voltage.
V1.6
Confidential 5
2021-11
Cao Min
Upgrades conditions for supporting RF modes
Upgrades headquarters address
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info.gnss@allystar.com
Headquarters
Allystar Technology (Shenzhen) Co., Ltd.
Address: 201-2, 2F, Tower F, Xinghe World, No.1, Yabao Road, LongGang District, Shenzhen
City, Guangdong Province, China.
Calgary Office
Allystar Technology (Canada) Ltd.
Address: Unit 288, 3553 31 Street NW Calgary, Alberta, Canada T2L 2K7
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