View source for TAU1312-datasheet


==TAU1312 Multi-Band GNSS RTK Module==

===Feature===

*Supports GPS, BDS, GLONASS, Galileo, and QZSS
*Compact size for high precision industry
*Integrated Real Time Kinematics (RTK)
*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
*Compact size 12*16mm

Table 1  TAU1312 P/N


===Product photo===



===Block diagram===

===Specifications===
Table 2
{| class="wikitable" 
|-
! Parameter
! colspan="3" | Specifications
|-
| Constellations
| colspan="3" | BDS, GPS, QZSS, GLONASS, Galileo, NavIC, SBAS
|-
| Channel
| colspan="3" | 40
|-
| Update rates
| colspan="3" | PVT 10Hz<br />RTK 5Hz Max
|-
| Position accuracy
| GNSS
| colspan="2" | 2.5m CEP
|-
| 
| SBAS
| colspan="2" | ＜1.0m CEP
|-
| 
| RTK
| colspan="2" | 1.5 cm + 1 ppm (H)<br />6.5 cm + 1 ppm (V)
|-
| Velocity & Time accuracy
| GNSS
| colspan="2" | 0.1 m/s CEP
|-
| 
| 1PPS
| colspan="2" | 20ns RMS
|-
| TTFF
| Hot start
| colspan="2" | 2s
|-
| 
| Cold start
| colspan="2" | 24s
|-
| RTK
| Convergence time
| colspan="2" | <10s
|-
| 
| Reliability
| colspan="2" | ＞99.9%
|-
| Sensitivity
| Cold start
| colspan="2" | -148 dBm
|-
| 
| Hot start
| colspan="2" | -158 dBm
|-
| 
| Reacquisition
| colspan="2" | -160 dBm
|-
| 
| Tracking & navigation
| colspan="2" | -162 dBm
|-
| Protocol
| NMEA-0183 V4.00/4.10
| colspan="2" | 
|-
| 
| RTCM 3.X
| colspan="2" | 
|-
| Baudrate
| 115200 bps, by default
| colspan="2" | 
|-
| Operating condition
| Main supply
| colspan="2" | 2.0V to 3.6V
|-
| 
| Digital I/O supply
| colspan="2" | 1.8V to 3.6V
|-
| 
| Backup supply
| colspan="2" | 1.8V to 3.6V
|-
| Power consumption
| Tracking
| GNSS
| 34 mA @ 3.3V
|-
| 
| 
| Single system
| 22 mA @ 3.3V
|-
| 
| Standby
| Data backup
| 12 uA
|-
| 
| 
| RTC
| 1.4 uA
|-
| Serial interface
| UART
| colspan="2" | 1
|-
| 
| SPI
| colspan="2" | 1
|-
| 
| I2C
| colspan="2" | 1
|-
| Operating limit
| Velocity
| colspan="2" | 515 m/s
|-
| 
| Altitude
| colspan="2" | 18,000m
|-
| Environmental conditions
| Operating temp.
| colspan="2" | -40°C to +85°C
|-
| 
| Storage temp.
| colspan="2" | -40°C to +90°C
|-
| 
| Humidity
| colspan="2" | 95% RH
|-
| Size
| colspan="3" | 16.0×12.2×2.4 mm, 24pin LCC
|}

===GNSS Reception===
Table 3 GNSS reception table
{| class="wikitable" 
|- style="background-color:#68cbd0;"
! rowspan="2" | P/N
! rowspan="2" style="text-align:center;" | OPTIONS
! colspan="5" | GPS/QZSS
! colspan="5" | BDS
! colspan="2" | GLONASS
! colspan="3" | GALILEO
! IRNSS
|- style="background-color:#68cbd0;"
| L1C/A
| L1C
| L2C
| L5
| L6
| B1I
| B1C
| B2I
| B2a
| B3I
| L1
| L2
| E1
| E5
| E6
| L5
|-
| rowspan="2" | TAU1312-1216A00
| A,L1+L5
| *
| 
| 
| *
| 
| *
| 
| 
| *
| 
| *
| 
| *
| *
| 
| 
|-
| B,L1+L2
| *
| 
| *
| 
| 
| *
| 
| *
| 
| 
| *
| *
| *
| 
| 
| 
|}

==PIN DESCRIPTION==

===Pin Assignment===

Figure 3 Pin assignment (top view)

===Detailed Pin Descriptions===
Table 4 Detailed pin descriptions

==ELECTRICAL CHARACTERISTICS==

===Absolute Maximum Rating===
Table 5 Absolute rating
{| class="wikitable" 
|- style="background-color:#68cbd0;"
! Symbol
! Parameter
! Min.
! Max.
! Unit
|-
| VDD
| Power input for the main power domain
| -0.5
| 3.63
| style="font-weight:bold;" | V
|-
| AVDD_BAK
| Power input for the backup power domain
| -0.5
| 3.63
| V
|-
| AVDUSB
| USB supply voltage
| -0.5
| 3.6
| V
|-
| T storage
| Storage temperature
| -40
| 85
| °C
|-
| T solder
| Solder reflow temperature
| --
| 260
| °C
|}

===IO Characteristics===

====PRRSTX and PRTRG====
Table 6 PRRSTX and PRTRG
{| class="wikitable" 
|- style="background-color:#00d2cb;"
! Symbol
! Parameter
! Condition
! Min.
! Typ.
! Max.
! Unit
|-
| I IZ
| Input leakage current
| style="text-align:center;" | --
| style="text-align:center;" | --
| style="text-align:center;" | --
| +/-1
| uA
|-
| V IH
| Input high voltage
| style="text-align:center;" | --
| style="text-align:center;" | AVDD_BAK*0. 7
| style="text-align:center;" | --
| AVDD_BAK
| V
|-
| V IL
| Input low voltage
| style="text-align:center;" | --
| style="text-align:center;" | 0
| style="text-align:center;" | --
| AVDD_BAK*0.3
| V
|-
| C i
| Input capacitance
| style="text-align:center;" | --
| style="text-align:center;" | --
| style="text-align:center;" | --
| 10
| pF
|-
| R PU
| Pull-up resistance
| style="text-align:center;" | --
| style="text-align:center;" | 18
| style="text-align:center;" | --
| 84
| kOhm
|}

====USB I/O====
Table 7 USB signal

====Others====
Table 8 Others

===DC Characteristics===

====Operating Conditions====
Table 9 Operating Conditions

====Power Consumption====
Table 10 Power consumption

==HARDWARE DESCRIPTION==

===Connecting Power===

TAU1312 positioning module has two power supply pins: VDD and AVDD_BAK. The VDD pin provides the main supply voltage, and the AVDD_BAK pin provides the backup supply voltage. In order to ensure the positioning performance, please control the ripple of the module power supply. 

It is recommended to use the LDO above 100mA.

If the power for VDD pin is off, the real-time clock (RTC) and battery backed RAM (BBR) are supplied through the AVDD_BAK pin. Thus, orbit information and time can be maintained and will allow a Hot or Warm start. If no backup battery is connected, the module performs a cold start at every power up if not aiding data are sent to the receiver.

Note: If no backup supply is available, connect the AVDD_BAK pin to VDD or leave it floating.

===Power on/off Sequence===

====Initial system power on====

====Main power supply off/on in application====

===Antenna design===

===Reset and mode control===

===Default Serial interfaces===
Table 11 Default message
{| class="wikitable" 
|-
! Interface
! Settings
|-
| UART output
| 115200 baud, 8 data bits, no parity bit, 1 stop bitConfigured to transmit both NMEA and HD Binary protocols, but only the following<br />NMEA (and no HD Binary sentence) messages have been activated at start-up:<br />GGA, GSA, GSV, RMC, ZDA, TXT-ANT
|-
| UART input
| 115200 baud, 8 data bits, no parity bit, 1 stop bit, autobauding disabled<br />Automatically accepts following protocols without need of explicit configuration:<br />HD binary sentence, NMEA, RTCM<br />The GNSS receiver supports interleaved HD binary and NMEA messages.
|-
| Timepulse,(1Hz Nav)
| 1 pulse per second, synchronized at rising edge, pulse length 100ms 
|}

==5 MECHANICAL SPECIFICATION==
[[File:Figure-6-dimensions.png|500px|frameless|Dimensions]]

Figure 6 Dimensions

Table 12 Dimensions
{| class="wikitable" 
|- style="background-color:#68cbd0;"
! 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
|}

==REFERENCE DESIGN==


===Minimal design===
This is a minimal design for TAU1312 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.

[[File:Figure-7-application-disgram.png|800px|frameless|Figure-7-application-disgram]]

===PCB Footprint Reference===
[[File:Figure-8-pcb-footprint.png|600px|frameless|Figure-7-application-disgram]]

===Layout===
(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.

==PRODUCT PACKANG AND HANDLING==


===Packaging===

====Packing Notes====
TAU1312 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.

====Tape and Reel====
TAU1312 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.

[[File:Figure-9-tape.png|600px|frameless|Figure-9-tap-dimensions]]

TAU1312 is deliverable in quantities of 1000pcs on a reel.

====Shipment Packaging====

The reels of TAU1312 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.

===Storage===

In order to prevent moisture intake and protect against electrostatic discharge, TAU1312 is packaged together with a humidity indicator card and desiccant to absorb humidity.

===ESD Handling Precautions===

TAU1312 module which contains highly sensitive electronic circuitry is an Electrostatic-sensitive Device (ESD). Observe precautions for handling! Failure to observe these precautions can 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).

===ESD protection measures===
TAU1312 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.
* Add ESD Diodes to the RF input part to prevent electrostatics discharge.
* Do not touch any exposed antenna area.
* Add ESD Diodes to the UART interface.

===Moisture sensitivity level===

The Moisture Sensitivity Level (MSL) of the GNSS module is MSL4.


==LABELING AND ORDERING INFORMATION==

Labeling and ordering information help customers get more about Allystar products.

===Labeling===

[[File:Labeling.png|500px|frameless]]