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

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

GNSS Reception

Table 3 GNSS reception table

P/N	OPTIONS	GPS/QZSS					BDS					GLONASS		GALILEO			IRNSS
P/N	OPTIONS	L1C/A	L1C	L2C	L5	L6	B1I	B1C	B2I	B2a	B3I	L1	L2	E1	E5	E6	L5
TAU1312-1216A00	A,L1+L5	*			*		*			*		*		*	*
TAU1312-1216A00	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

Symbol	Parameter	Min.	Max.	Unit
VDD	Power input for the main power domain	-0.5	3.63	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

Symbol	Parameter	Condition	Min.	Typ.	Max.	Unit
I IZ	Input leakage current	--	--	--	+/-1	uA
V IH	Input high voltage	--	AVDD_BAK*0. 7	--	AVDD_BAK	V
V IL	Input low voltage	--	0	--	AVDD_BAK*0.3	V
C i	Input capacitance	--	--	--	10	pF
R PU	Pull-up resistance	--	18	--	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

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

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 NMEA (and no HD Binary sentence) messages have been activated at start-up: GGA, GSA, GSV, RMC, ZDA, TXT-ANT
UART input	115200 baud, 8 data bits, no parity bit, 1 stop bit, autobauding disabled 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

5 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

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.

PCB Footprint Reference

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.