Subscribe to Our Youtube Channel
Related Manuals for unicore UM981S
Summary of Contents for unicore UM981S
- Page 1 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.
-
Page 2: Revision History
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... - Page 3 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.
- Page 4 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.
-
Page 5: Table Of Contents
UM981S User Manual Contents Introduction ....................1 Key Features ........................2 Key Specifications ......................2 Block Diagram ........................5 Hardware ....................6 Pin Definition ........................6 Electrical Specifications ....................10 2.2.1 Absolute Maximum Ratings ..................10 2.2.2 Operating Conditions ....................11 2.2.3 IO Threshold ....................... -
Page 6: Introduction
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. -
Page 7: Key Features
UM981S User Manual 1.1 Key Features Based on the new generation GNSS SoC - NebulasIV , 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 ... - Page 8 Horizontal: 1.5 m Single Point Positioning (RMS) Vertical: 2.5 m Horizontal: 0.4 m DGPS (RMS) Vertical: 0.8 m Positioning Accuracy Horizontal: 0.8 cm + 1 ppm (RMS) Vertical: 1.5 cm + 1 ppm 10 mm + 0.7 mm/°tilt Tilt Measurement (accuracy <...
- Page 9 UM981S User Manual Time Pulse Accuracy (RMS) 20 ns Velocity Accuracy (RMS) 0.03 m/s Cold Start < 12 s Time to First Fix (TTFF) Hot Start < 4 s GNSS Initialization Time < 5 s (Typical) GNSS Initialization Reliability > 99.9% 100 Hz IMU raw data output and GNSS &...
-
Page 10: Block Diagram
(UC9810). NebulasIV 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. C, SPI and CAN are reserved interfaces, not supported currently. -
Page 11: Hardware
It integrates a dual-core CPU, a high speed floating point processor and an RTK co- processor, which can fulfill the high precision baseband processing and RTK positioning on a single chip. External Interfaces The external interfaces of UM981S include UART, I , SPI , CAN , PPS, EVENT, RTK_STAT, PVT_STAT, ERR_STAT, RESET_N, etc. - Page 12 Table 2-1 Pin Description Description — Ground ANT_IN GNSS antenna signal input — Ground ANT_DETECT Antenna signal detection ANT_OFF Disable external LNA ANT_SHORT_N Antenna short circuit detection; active low VCC_RF External LNA power supply SPIS_CSN Chip select pin for SPI slave Master Out / Slave In.
- Page 13 UM981S User Manual Description RTK status: active high; RTK_STAT Outputs high for RTK fixed solution and low for other positioning status or no positioning Error status: active high; ERR_STAT Outputs high when failing self-test and low when passing self-test —...
- Page 14 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 V_BCKP the working current is less than 60 μA at 25 °...
-
Page 15: Electrical Specifications
UM981S User Manual Description Pulse per second, with adjustable pulse 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 Min. Max. Unit Power Supply Voltage -0.3 Input Voltage -0.3... -
Page 16: Operating Conditions
2.2.2 Operating Conditions Table 2-3 Operating Conditions Parameter Symbol Min. Typ. Max. Unit Condition Power Supply Voltage Maximum VCC Ripple Working Current VCC=3.3 V VCC_RF Output Voltage VCC_RF VCC-0.1 VCC_RF Output Current ICC_RF Operating Temperature ° C Power Consumption 2.2.3 IO Threshold Table 2-4 IO Threshold Parameter Symbol... -
Page 17: Antenna Feature
UM981S User Manual 2.2.4 Antenna Feature Table 2-5 Antenna Feature Parameter Symbol Min. Typ. Max. Unit Condition Optimum Input Gain 2.3 Dimensions Table 2-6 Dimensions Parameter Min. (mm) Typ. (mm) Max. (mm) 21.80 22.00 22.50 16.80 17.00 17.50 2.40 2.60 2.80... - Page 18 Figure 2-2 UM981S Mechanical Dimensions...
-
Page 19: Hardware Design
UM981S User Manual 3 Hardware Design 3.1 Recommended Minimal Design 3.3V 3.3V ANT_BIAS V_BCKP RXD (UART) UM981S HOST ANT_IN TXD (UART) RESET_N 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 μF + 1 * 100 nF capacitors connected in parallel is recommended, and the... -
Page 20: Antenna Feed Design
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. -
Page 21: Power-On And Power-Off
UM981S User Manual 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) D1: ESD diode, choose the ESD protection device that supports high frequency... -
Page 22: Grounding And Heat Dissipation
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. -
Page 23: Production Requirement
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. -
Page 24: Packaging
Figure 5-1 Label Description 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. - Page 25 UM981S User Manual temperature of 55 degrees Celsius, modules shall be removed from the package during baking. Figure 5-2 UM981S Package Reel Feed Direction Cover Tape Carrier Tape Dimensions 0.35 1.75± 0.10 20.20± 0.10 40.40± 0.10 2.00± 0.10 17.8 0.10 1.50 - +...
- Page 26 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.
- Page 27 和芯星通科技（北京）有限公司 Unicore Communications, Inc. 北京市海淀区丰贤东路 7 号北斗星通大厦三层 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 www.unicore.com...
Need help?
Do you have a question about the UM981S and is the answer not in the manual?
Questions and answers