UM981S Multi Frequency RTK INS Integrated Positioning Module
“
Product Information
Specifications
Model: UM981S
Supported Constellations:
BDS/GPS/GLONASS/Galileo/QZSS
Functionality: All-constellation
Multi-frequency RTK/INS Integrated Positioning Module
Revision History: Version R1.0, First release,
Oct. 2024
Product Usage Instructions
Installation
1. Ensure the device is powered off before installation.
2. Connect the UM981S module to the corresponding interface on
your system.
3. Power on the device and follow system prompts for initial
setup.
Operation
1. Once installed, the UM981S module will start acquiring
satellite signals automatically.
2. Configure the module settings as per your requirements using
the provided user manual.
3. The module will provide accurate positioning information
based on the connected constellations.
Frequently Asked Questions (FAQ)
Q: What should I do if I encounter inconsistencies with the
product?
A: Contact Unicore or their local authorized
distributor for the most up-to-date version of the manual and any
corrections.
Q: Can the UM981S module work with other GNSS modules?
A: The UM981S module is designed to work
independently, but compatibility with other GNSS modules may vary.
Refer to the user manual for more information.
“`
INSTALLATION AND OPERATION
USER MANUAL
WWW.UNICORE.COM
UM981S
BDS/GPS/GLONASS/Galileo/QZSS
All-constellation Multi-frequency RTK/INS Integrated Positioning Module
Copyright© 2009-2024, Unicore Communications, Inc. Data subject to change without notice.
Revision History
Version R1.0
Revision History First release
Date Oct. 2024
Legal right notice
This manual provides information and details on the products of Unicore Communication, Inc. (“Unicore”) referred to herein.
All rights, title and interest to this document and the information such as data, designs, layouts contained in this manual are fully reserved, including but not limited to the copyrights, patents, trademarks and other proprietary rights as relevant governing laws may grant, and such rights may evolve and be approved, registered or granted from the whole information aforesaid or any part(s) of it or any combination of those parts.
Unicore holds the trademarks of “”, “UNICORECOMM”, “Unicore” and other
trade name, trademark, icon, logo, brand name and/or service mark of Unicore products or their product serial referred to in this manual (collectively “Unicore Trademarks”).
This manual or any part of it, shall not be deemed as, either expressly, implied, by estoppel or any other form, the granting or transferring of Unicore rights and/or interests (including but not limited to the aforementioned trademark rights), in whole or in part.
Disclaimer
The information contained in this manual is provided “as is” and is believed to be true and correct at the time of its publication or revision. This manual does not represent, and in any case, shall not be construed as a commitments or warranty on the part of Unicore with respect to the fitness for a particular purpose/use, the accuracy, reliability and correctness of the information contained herein.
Information, such as product specifications, descriptions, features and user guide in this manual, are subject to change by Unicore at any time without prior notice, which may not be completely consistent with such information of the specific product you purchase.
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UM981S User Manual
Should you purchase our product and encounter any inconsistency, please contact us or our local authorized distributor for the most up-to-date version of this manual along with any addenda or corrigenda.
ii
Foreword
This document describes the hardware information, specifications, packaging and the use of Unicore UM981S modules.
Target Readers
This document is written for technicians who are familiar with GNSS modules.
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UM981S User Manual
Contents
1 Introduction ………………………………………………………………………………….. 1
1.1 Key Features………………………………………………………………………………………………………2 1.2 Key Specifications ……………………………………………………………………………………………..2 1.3 Block Diagram……………………………………………………………………………………………………5
2 Hardware ……………………………………………………………………………………… 6
2.1 Pin Definition……………………………………………………………………………………………………..6 2.2 Electrical Specifications ………………………………………………………………………………….. 10
2.2.1 Absolute Maximum Ratings…………………………………………………………………………..10 2.2.2 Operating Conditions…………………………………………………………………………………….11 2.2.3 IO Threshold …………………………………………………………………………………………………11 2.2.4 Antenna Feature……………………………………………………………………………………………12 2.3 Dimensions ……………………………………………………………………………………………………. 12
3 Hardware Design …………………………………………………………………………. 14
3.1 Recommended Minimal Design……………………………………………………………………….. 14 3.2 Antenna Feed Design ……………………………………………………………………………………… 15 3.3 Power-on and Power-off ………………………………………………………………………………… 16 3.4 Grounding and Heat Dissipation ……………………………………………………………………… 17 3.5 Recommended PCB Package Design ………………………………………………………………. 17
4 Production Requirement……………………………………………………………….. 18 5 Packaging…………………………………………………………………………………… 19
5.1 Label Description ……………………………………………………………………………………………. 19 5.2 Product Packaging …………………………………………………………………………………………. 19
I
1 Introduction
UM981S is a new generation GNSS high precision RTK/INS integrated positioning module from Unicore. It can track BDS/GPS/GLONASS/Galileo/QZSS all constellations and multiple frequencies. The module is mainly used in high precision applications and is particularly suitable for surveying and mapping. UM981S is based on NebulasIVTM, a GNSS SoC which integrates RF, baseband and high precision algorithm. Besides, the SoC integrates a dual-core CPU, a high speed floating point processor and an RTK co-processor. It is processed with 22 nm low power design and has 1408 channels, being able to output 100 Hz IMU raw data and up to 50 Hz* RTK positioning data, providing powerful data processing ability. With the built-in JamShield anti-jamming technology, UM981S has improved the performance of multi-mode multifrequency RTK solution, ensuring fast RTK initialization speed, high accuracy of measurement and high reliability even in signal-challenging environments such as urban canyons and tree shades. UM981S has also integrated an IMU for surveying and mapping applications, supporting tilt compensation. UM981S has various interfaces such as UART, I2C* and SPI*, as well as 1PPS, EVENT and CAN*, which meets customers’ needs in different applications.
Figure 1-1 UM981S Module
* Data update rate can reach 50 Hz after firmware upgrade. * I2C, SPI and CAN are reserved interfaces, not supported currently.
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UM981S User Manual
1.1 Key Features
Based on the new generation GNSS SoC – NebulasIVTM, which integrates RF, baseband and high precision algorithm
All-constellation multi-frequency RTK engine and advanced RTK processing technology
Instantaneous RTK initialization technology Tracking different frequencies separately with 60 dB narrowband anti-jamming
technology 100 Hz IMU raw data output and GNSS & IMU integrated data output, up to 50 Hz*
RTK positioning data output Supports tilt compensation
1.2 Key Specifications
Table 1-1 Technical Specifications
Basic Information
Channels
1408 channels, based on NebulasIVTM
Constellations
BDS/GPS/GLONASS/Galileo/QZSS
Frequencies
BDS: B1I, B2I, B3I, B1C, B2a, B2b GPS: L1 C/A, L1C, L2P (Y), L2C, L5 GLONASS: G1, G2, G3 Galileo: E1, E5a, E5b, E6 QZSS: L1C/A, L1C, L2C, L5 NavIC: L5
Power
Voltage
+3.0 V ~ +3.6 V DC
Power Consumption
480 mW (Typical)
Performance
2
Positioning Accuracy
Attitude Accuracy
Observation Accuracy (RMS) B1I/B1C/L1C/L1 C/A/G1/E1 Pseudorange B1I/B1C/L1C/L1 C/A/G1/E1 Carrier Phase B3I/L2P(Y)/L2C/G2/E6 Pseudorange B3I/L2P(Y)/L2C/G2/E6 Carrier Phase B2I/B2a/B2b/L5/G3/E5a/E5b Pseudorange B2I/B2a/B2b/L5/G3/E5a/E5b Carrier Phase
Single Point Positioning1 (RMS)
Horizontal: 1.5 m Vertical: 2.5 m
DGPS1,2 (RMS)
Horizontal: 0.4 m Vertical: 0.8 m
RTK1,2 (RMS)
Horizontal: 0.8 cm + 1 ppm Vertical: 1.5 cm + 1 ppm
Tilt Measurement
10 mm + 0.7 mm/°tilt (accuracy < 2.5 cm within 30°)
Heading
0.3°
Roll
0.2°
Pitch
0.2°
BDS
GPS
GLONASS Galileo
10 cm 10 cm 10 cm
10 cm
1 mm
1 mm
1 mm
1 mm
10 cm 10 cm 10 cm
10 cm
1 mm
1 mm
1 mm
1 mm
10 cm 10 cm 10 cm
10 cm
1 mm
1 mm
1 mm
1 mm
1 Test results may be biased due to atmospheric conditions, baseline length, GNSS antenna type, multipath effect, number of visible satellites, and satellite geometry. 2 The measurement uses 1 km baseline and a receiver with good antenna performance, regardless of possible errors of antenna phase center offset.
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UM981S User Manual
Time Pulse Accuracy (RMS) Velocity Accuracy3 (RMS)
Time to First Fix4 (TTFF)
GNSS Initialization Time1 GNSS Initialization Reliability1
Data Update Rate5
Differential Data Data Format Physical Characteristics Package Dimensions Weight Environmental Specifications Operating Temperature Storage Temperature Humidity Vibration Shock Functional Ports
20 ns 0.03 m/s Cold Start < 12 s Hot Start < 4 s < 5 s (Typical) > 99.9% 100 Hz IMU raw data output and GNSS & IMU integrated data output 50 Hz RTK positioning data output RTCM 3.X NMEA-0183, Unicore
54 pin LGA 22 mm × 17 mm × 2.6 mm 1.91 g ± 0.03 g
-40 °C ~ +85 °C -55 °C ~ +95 °C 95% No condensation GJB150.16A-2009, MIL-STD-810F GJB150.18A-2009, MIL-STD-810F
3 Open sky, unobstructed scene, 99% @ static 4 -130dBm @ more than 12 available satellites 5 The 50 Hz data update rate is supported after firmware upgrade
4
UART × 3 I2C* × 1 SPI* × 1 CAN* × 1
Slave Shared with UART3
1.3 Block Diagram
RF in LNA
SAW Filter
SPI
M-Sensor IMU TCXO 32K
I2C CLOCK
NebulasIV
GNSS RF
GNSS BB
Interface
Interface
PMU
UART1/2/3 I2C SPIS PPS EVENT PVTRTKERR
RESET_N
RF Part
Figure 1-2 UM981S Block Diagram
The receiver gets filtered and enhanced GNSS signals from the antenna via a coaxial cable. The RF part converts the RF input signals into the IF signals, and converts IF analog signals into digital signals required for NebulasIVTM chip (UC9810).
NebulasIVTM SoC (UC9810)
NebulasIV (UC9810) is Unicore’s new generation high precision GNSS SoC with 22 nm low power design, supporting all constellations and all frequencies with 1408 channels.
* I2C, SPI and CAN are reserved interfaces, not supported currently.
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UM981S User Manual
It integrates a dual-core CPU, a high speed floating point processor and an RTK coprocessor, which can fulfill the high precision baseband processing and RTK positioning on a single chip. External Interfaces The external interfaces of UM981S include UART, I2C*, SPI*, CAN*, PPS, EVENT, RTK_STAT, PVT_STAT, ERR_STAT, RESET_N, etc.
2 Hardware
2.1 Pin Definition
GND NC NC NC GND V_BCKP NC VCC VCC GND RXD3 TXD3 BIF BIF
TXD1
42
RXD1
43
SDA
44
SCL
45
NC
46
NC
47
GND
48
RESET_N
49
NC
50
EVENT
51
NC
52
PPS
53
NC
54
41 40 39 38 37 36 35 34 33 32 31 30 29 28
Top View
1
2
3
4
5
6
7
8
9 10 11 12 13 14
27
TXD2
26
RXD2
25
NC
24
NC
23
RSV
22
RSV
21
ERR_STAT
20
RTK_STAT
19
PVT_STAT
18
NC
17
NC
16
NC
15
NC
GND ANT_IN
GND ANT_DETECT
ANT_OFF ANT_SHORT_N
VCC_RF SPIS_CSN SPIS_MOSI SPIS_CLK SPIS_MISO
GND RSV GND
Figure 2-1 UM981S Pin Definition
* I2C, SPI, CAN: reserved interfaces, not supported currently
6
Table 2-1 Pin Description
No. Pin
1
GND
2
ANT_IN
3
GND
4
ANT_DETECT
5
ANT_OFF
6
ANT_SHORT_N
7
VCC_RF6
8
SPIS_CSN
9
SPIS_MOSI
10 SPIS_CLK
11 SPIS_MISO
12 GND 13 RSV 14 GND 15 NC 16 NC 17 NC 18 NC
19 PVT_STAT
I/O
Description
—
Ground
I
GNSS antenna signal input
—
Ground
I
Antenna signal detection
O
Disable external LNA
I
Antenna short circuit detection; active low
O
External LNA power supply
I
Chip select pin for SPI slave
Master Out / Slave In. This pin is used to I
receive data in slave mode.
I
Clock input pin for SPI slave
Master In / Slave Out. This pin is used to O
transmit data in slave mode.
—
Ground
—
Reserved; must be floating
—
Ground
—
No connection inside; leave floating
—
No connection inside; leave floating
—
No connection inside; leave floating
—
No connection inside; leave floating
PVT status: active high;
O
Outputs high when positioning and low when
not positioning
6 Not recommended to use VCC_RF as ANT_BIAS to feed the antenna. See section 3.2 for more details.
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UM981S User Manual
No. Pin 20 RTK_STAT
21 ERR_STAT 22 RSV 23 RSV 24 NC 25 NC 26 RXD2 27 TXD2
28 BIF
29 BIF
30 TXD3 31 RXD3 32 GND 33 VCC 34 VCC
I/O
Description
RTK status: active high;
O
Outputs high for RTK fixed solution and low
for other positioning status or no positioning
Error status: active high;
O
Outputs high when failing self-test and low
when passing self-test
—
Reserved; must be floating
—
Reserved; must be floating
—
No connection inside; leave floating
—
No connection inside; leave floating
I
COM2 input, LVTTL
O
COM2 output, LVTTL
Built-in function; recommended to add a
through-hole testing point and a 10 k pull-
—
up resistor; cannot connect ground or power
supply or input/output data, but can be
floating
Built-in function; recommended to add a
through-hole testing point and a 10 k pull-
—
up resistor; cannot connect ground or power
supply or input/output data, but can be
floating
COM3 output, can be used as CAN TXD, O
LVTTL
I
COM3 input, can be used as CAN RXD, LVTTL
—
Ground
I
Power supply
I
Power supply
8
No. Pin 35 NC
36 V_BCKP
37 GND 38 NC 39 NC 40 NC 41 GND 42 TXD1 43 RXD1 44 SDA 45 SCL 46 NC 47 NC 48 GND 49 RESET_N 50 NC 51 EVENT 52 NC
I/O
Description
—
No connection inside; leave floating
When the main power supply VCC is cut off,
V_BCKP supplies power to RTC and relevant
register. Level requirement: 2.0 V ~ 3.6 V, and
I
the working current is less than 60 A at
25 °C. If you do not use the hot start function,
connect V_BCKP to VCC. Do NOT connect it
to ground or leave it floating.
—
Ground
—
No connection inside; leave floating
—
No connection inside; leave floating
—
No connection inside; leave floating
—
Ground
O
COM1 output, LVTTL
I
COM1 input, LVTTL
I/O
I2C data
I/O
I2C clock
—
No connection inside; leave floating
—
No connection inside; leave floating
—
Ground
System reset; active Low. The active time I
should be no less than 5 ms.
—
No connection inside; leave floating
Event mark input, with adjustable frequency I
and polarity
—
No connection inside; leave floating
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UM981S User Manual
No. Pin 53 PPS 54 NC
I/O
Description
Pulse per second, with adjustable pulse O
width and polarity
—
No connection inside; leave floating
2.2 Electrical Specifications
2.2.1 Absolute Maximum Ratings
Table 2-2 Absolute Maximum Ratings
Parameter
Symbol
Power Supply Voltage
VCC
Input Voltage
Vin
GNSS Antenna Signal Input ANT_IN
Antenna RF Input Power
ANT_IN input power
External LNA Power Supply VCC_RF
VCC_RF Output Current
ICC_RF
Storage Temperature
Tstg
Min. -0.3 -0.3 -0.3
-0.3
-55
Max. 3.6 3.6 6
+10
3.6 100 95
Unit V V V
dBm
V mA °C
10
2.2.2 Operating Conditions
Table 2-3 Operating Conditions
Parameter
Symbol Min.
Power Supply Voltage7 VCC
3.0
Maximum VCC Ripple Vrpp
0
Working Current8
Iopr
VCC_RF Output Voltage VCC_RF
VCC_RF Output Current ICC_RF
Operating Temperature Topr
-40
Power Consumption
P
Typ.
Max. Unit Condition
3.3
3.6 V
50 mV
145
180 mA VCC=3.3 V
VCC-0.1
V
50 mA
85 °C
480
mW
2.2.3 IO Threshold
Table 2-4 IO Threshold
Parameter
Symbol Min.
Low Level Input Voltage Vin_low
0
High Level Input Voltage Vin_high
VCC × 0.7
Low Level Output Voltage Vout_low 0
High Level Output Voltage
Vout_high
VCC 0.45
Typ. Max. 0.6 VCC + 0.2 0.45
VCC
Unit Condition V
V
V
Iout = 2 mA
V
Iout = 2 mA
7 The voltage range of VCC (3.0 V ~ 3.6 V) has already included the ripple voltage. 8 Since the product has capacitors inside, inrush current occurs during power-on. You should evaluate in the actual environment in order to check the effect of the supply voltage drop caused by inrush current in the system.
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UM981S User Manual
2.2.4 Antenna Feature
Table 2-5 Antenna Feature
Parameter
Symbol
Optimum Input Gant
Gain
Min. 18
Typ. 30
Max. 36
Unit Condition dB
2.3 Dimensions
Table 2-6 Dimensions
Parameter
Min. (mm)
A
21.80
B
16.80
C
2.40
D
3.75
E
0.95
F
1.80
G
1.00
H
0.70
K
1.40
M
3.55
N
3.15
P
2.00
R
1.00
X
0.72
Typ. (mm) 22.00 17.00 2.60 3.85 1.05 1.90 1.10 0.80 1.50 3.65 3.25 2.10 1.10 0.82
Max. (mm) 22.50 17.50 2.80 3.95 1.15 2.00 1.20 0.90 1.60 3.75 3.35 2.20 1.20 0.92
12
Figure 2-2 UM981S Mechanical Dimensions
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UM981S User Manual
3 Hardware Design
3.1 Recommended Minimal Design
ANT
ANT_BIAS L1
C1
3.3V
3.3V
C3
R1
R1
V_BCKP VCC
BIF BIF
TXD
C2
UM982 UM981S ANT_IN
RXD
RESET_N
GND
RXD (UART)
HOST TXD (UART)
IO
GND
Figure 3-1 Recommended Minimal Design
L1: 68 nH RF inductor in 0603 package is recommended C1: 100 nF + 100 pF capacitors connected in parallel is recommended C2: 100 pF capacitor is recommended C3: N * 10 F + 1 * 100 nF capacitors connected in parallel is recommended, and the total inductance should be no less than 30 F R1: 10 k resistor is recommended
14
3.2 Antenna Feed Design
UM981S supports feeding the antenna from the outside of the module rather than from the inside. It is recommended to use devices with high power and that can withstand high voltage. Gas discharge tube, varistor, TVS tube and other high-power protective devices may also be used in the power supply circuit to further protect the module from lightning strike and surge.
If the antenna feed supply ANT_BIAS and the module’s main supply VCC use the same power rail, the ESD, surge and overvoltage from the antenna will have an effect on VCC, which may cause damage to the module. Therefore, it is recommended to design an independent power rail for the ANT_BIAS to reduce the possibility of module damage.
ANT
ANT_BIAS L1
D1 D2
C1
C2 ANT_IN
VCC_RF
UM981S
GND
Notes:
Figure 3-2 UM981S External Antenna Feed Reference Circuit
1. L1: feed inductor, 68 nH RF inductor in 0603 package is recommended
2. C1: decoupling capacitor, recommended to connect two capacitors of
100 nF/100 pF in parallel
3. C2: DC blocking capacitor, recommended 100 pF capacitor
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UM981S User Manual
4. It is not recommended to use VCC_RF as ANT_BIAS to feed the antenna (VCC_RF has not been optimized for anti-lightning strike, anti-surge and over current protection due to the compact size of the module)
5. D1: ESD diode, choose the ESD protection device that supports high frequency signals (above 2000 MHz)
6. D2: TVS diode, choose a TVS diode with appropriate clamping specification according to the requirement of feed voltage and antenna withstand voltage
3.3 Power-on and Power-off
VCC The VCC initial level when power-on should be less than 0.4 V. The VCC ramp when power-on should be monotonic, without plateaus. The voltages of undershoot and ringing should be within 5% VCC. Power-on time interval: The time interval between the power-off (VCC < 0.4 V) to
the next power-on must be larger than 500 ms. V_BCKP The V_BCKP initial level when power-on should be less than 0.4 V. The V_BCKP ramp when power-on should be monotonic, without plateaus. The voltages of undershoot and ringing should be within 5% V_BCKP. Power-on time interval: The time interval between the power-off (V_BCKP < 0.4 V)
to the next power-on must be larger than 500 ms.
16
3.4 Grounding and Heat Dissipation
Grounding and heat dissipation pad
Figure 3-3 Grounding and Heat Dissipation Pad (Bottom View)
The 48 pads in the rectangle area are used for grounding and heat dissipation. In the PCB design, the pads should be connected to a large-size ground to strengthen the heat dissipation.
3.5 Recommended PCB Package Design
See the following figure for the recommended PCB package design.
1.79 1.79
2.29 2.44
3.25
1.10 1.90
2.10
17.00
1.19
1.09
3.25 1.90
3.73
3.58
Notes:
Figure 3-4 Recommended PCB Package Design
For the convenience of testing, the soldering pads of the pins are designed long, exceeding the module border much more. For example:
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UM981S User Manual
The pads denoted as detail C are 1.79 mm longer than the module border.
The pad denoted as detail A is 0.50 mm longer than the module border. It is relatively short because it is an RF pin pad, so we hope the trace on the surface is as short as possible to reduce the impact of external interference on the RF signals.
4 Production Requirement
Recommended soldering temperature curve is as follows:
Rising °C
250
217 200
Preheating
Reflux Peak 245 °C
40~60s
Cooling
150
Max. 3°C/s
100
60~120s
50
0
Time (s)
Figure 4-1 Soldering Temperature (Lead-free)
Temperature Rising Stage Rising slope: Max. 3 °C/s Rising temperature range: 50 °C ~ 150 °C
Preheating Stage Preheating time: 60s ~ 120 s Preheating temperature range: 150 °C ~ 180 °C
Reflux Stage Over melting temperature (217 °C) time: 40s ~ 60 s Peak temperature for soldering: no higher than 245 °C
Max. 4°C/s
18
Cooling Stage Cooling slope: Max. 4 °C / s
In order to prevent falling off during soldering of the module, do not solder it on the back of the board during design, and it is not recommended to go through soldering cycle twice.
The setting of soldering temperature depends on many factors of the factory, such as board type, solder paste type, solder paste thickness etc. Please also refer to the relevant IPC standards and indicators of solder paste.
Since the lead soldering temperature is relatively low, if using this method, please give priority to other components on the board.
The opening of the stencil needs to meet your design requirement and comply with the examine standards. The thickness of the stencil is recommended to be 0.15 mm.
5 Packaging
5.1 Label Description
Product Model Part Number
Serial Number
UM981S
P/N: 2310415000038 S/N: 0000000000
XX
Figure 5-1 Label Description
Product QR Code
5.2 Product Packaging
The UM981S module uses carrier tape and reel (suitable for mainstream surface mount devices), packaged in vacuum-sealed aluminum foil antistatic bags, with a desiccant inside to prevent moisture. When using reflow soldering process to solder modules, please strictly comply with IPC standard to conduct temperature and humidity control on the modules. As packaging materials such as the carrier tape can only withstand the
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UM981S User Manual
temperature of 55 degrees Celsius, modules shall be removed from the package during baking.
Figure 5-2 UM981S Package
P0 P2
E
F
B B
W
Reel
Feed Direction
S
Reel Packaging Diagram
(For Reference Only)
C
A
Dimensions
E 1.75±0.10
F 20.20±0.10
S 40.40±0.10
P2 2.00±0.10
Do
1.50
+-
0.10 0.00
D1
Po 4.00±0.10
10Po40.00±0.20
W 44.00±0.30
P 24.00±0.10
Ao 17.80±0.10
B0 22.80±0.10
K0 3.30±0.10
t 0.35±0.05
1.70-+00..0155
A
24 0.35
Cover Tape Carrier Tape
0.3 3.3
22.8
17.8
A-A
1.50+-00..0100
B-B
330*180*44mm
C(3:1)
Note: 1. The cumulative tolerance of 10 side holes should not exceed ±0.2 mm. 2. Material of the tape: Black antistatic PS (surface impedance 105-1011)
(surface static voltage <100 V), thickness: 0.35 mm. 3. Total length of the 13-inch reel package: 6.816 m (Length of the first part of
empty packets: 0.408 m, length of packets containing modules: 6 m, length of the last part of empty packets: 0.408 m). 4. Total number of packets in the 13-inch reel package: 284 (Number of the first part of empty packets: 17; actual number of modules in the packets: 250; number of the last part of empty packets: 17). 5. All dimension designs are in accordance with EIA-481-C-2003. 6. The maximum bending degree of the carrier tape within the length of 250 mm should not exceed 1 mm (see the figure below).
20
1m m
250mm
Figure 5-3 UM981S Reel Package Diagram Table 5-1 Package Description
Item
Description
Module Number 250 pieces/reel
Reel Size
Tray: 13″ External diameter: 330 ± 2 mm, Internal diameter: 180 ± 2mm, Width: 44.5 ± 0.5 mm Thickness: 2.0 ± 0.2 mm
Carrier Tape
Space between (center-to-center distance): 24 mm
Before surface mounting, make sure that the color of the 30% circle on the HUMIDITY INDICATOR is blue (see Figure 5-4). If the color of the 20% circle is pink and the color of the 30% circle is lavender (see Figure 5-5), you must bake the module until it turns to blue. The UM981S is rated at MSL level 3. Please refer to the IPC/JEDEC J-STD-033 standards for the package and operation requirements. You may also access to the website www.jedec.org to get more information.
Figure 5-4 Normal Humidity Indication
Figure 5-5 Abnormal Humidity Indication
The shelf life of the UM981S module packaged in vacuum-sealed aluminum foil antistatic bags is one year.
21
Unicore Communications, Inc.
7
F3, No.7, Fengxian East Road, Haidian, Beijing, P.R.China, 100094 www.unicore.com Phone: 86-10-69939800 Fax: 86-10-69939888 info@unicorecomm.com
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Documents / Resources
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unicore UM981S Multi Frequency RTK INS Integrated Positioning Module [pdf] User Manual UM981S, UM981S Multi Frequency RTK INS Integrated Positioning Module, Multi Frequency RTK INS Integrated Positioning Module, RTK INS Integrated Positioning Module, INS Integrated Positioning Module, Positioning Module, Module |