unicore UM960L All Constellation Multi Frequency High Precision RTK Positioning Module User Manual

unicore UM960L All Constellation Multi Frequency High Precision RTK Positioning Module User Manual

Revision History

Recommended Minimal Design Optimize section 3.2 Antenna Feed Design Optimize section 3.3 Power-on and Power-offAdd section 3.5 Recommended PCB Package DesignUpdate the working current;| Mar., 2022

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Foreword

This document describes the information of the hardware, package, specification and the use of Unicore UM960L modules.

Target Readers
This document applies to technicians who possess the expertise on GNSS receivers

Introduction

UM960L is a new generation of GNSS high precision positioning RTK module from Unicore. It supports all constellations and multiple frequencies, and can simultaneously track GPS L1/L2/L5 + BDS B1I/B2I/B3I + GLONASS G1/G2 +Galileo E1/E5a/E5b + QZSS L1/L2/L5. The module is mainly used in geological hazard monitoring, deformation monitoring, and high precision GIS.

UM960L is based on NebulasⅣTM, a GNSS SoC which integrates RF-baseband and high precision algorithms. Besides, the SoC integrates a dual-core CPU, a high speed floating point processor and a RTK co-processor with 22 nm low power design, and it supports 1408 super channels. All these above enable stronger signal processing.

UM960L features a compact size of 16.0 mm × 12.2 mm. It adopts SMT pads, supports standard pick-and-place, and supports fully automated integration of reflow soldering.

Furthermore, UM960L supports interfaces such as UART, I2C, which meets the customers’ needs in different applications.

Figure 1-1 UM960L Module

Key Features

• High precision, compact size and low power consumption
• Based on the new generation GNSS SoC -NebulasIVTM, with RF-baseband and high precision algorithms integrated
• 16.0 mm × 12.2 mm × 2.4 mm, surface-mount device
• Supports all-constellation multi-frequency on-chip RTK positioning solution
• Supports GPS L1/L2/L5 + BDS B1I/B2I/B3I + GLONASS G1/G2 + Galileo E1/E5b/E5a + QZSS L1/L2/L5
• All constellations and multiple frequencies RTK engine, and advanced RTK processing technology
• Independent tracking of different frequencies, and 60 dB narrowband anti-jamming

Key Specifications

Table 1-1 Technical Specifications

Basic Information

Power

Performance

Vertical: 2.5 m
DGPS (RMS)| Horizontal: 0.4 m
Vertical: 0.8 m
RTK (RMS)| Horizontal: 0.8 cm + 1 ppm
Vertical: 1.5 cm + 1 ppm
Observation Accuracy（RMS）| BDS| GPS| GLONASS| Galileo
B1I/ L1C/A /G1/E1 Pseudorange| 10 cm| 10 cm| 10 cm| 10 cm
B1I/ L1C/A /G1/E1 Carrier Phase| 1 mm| 1 mm| 1 mm| 1 mm

Physical Specifications

Environmental Specifications

Functional Ports

UART x 3

I 2C * x 1

Block Diagram

Figure 1-2 UM960L Block Diagram

• RF Part
  The receiver gets filtered and enhanced GNSS signal 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.

• NebulasIVTM SoC
  NebulasIVTM is UNICORECOMM’s new generation high precision GNSS SoC with 22 nm low power design, supporting all constellations, multiple frequencies and 1408 super channels. 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 independently.

• External Interfaces
  The external interfaces of UM960L include UART, I 2C PPS, EVENT, RESET_N, etc.

Hardware

Pin Definition

Figure 2-1 UM960L Pin Definition

Table 2-1 Pin Definition

peripheral I/O
2| RSV| —| Reserved, must be floating; cannot connectground or power supply or peripheral I/O
3| PPS| O| Pulse per second, with adjustable pulse widthand polarity
4| EVENT| I| Event Mark, with adjustable frequency andpolarity
5| BIF| —| Built-in function; recommended to add a through-hole testing point and a 10 kΩ pull-up resistor; cannot connect ground or powersupply or peripheral I/O, but can be floating.
6| TXD2| O| UART2 output
7| RXD2| I| UART2 input
8| RESET_N| I| System reset; active Low. The active time shouldbe no less than 5 ms.
9| VCC_RF1| O| External LNA power supply
10| GND| —| Ground
11| ANT_IN| I| GNSS antenna signal input
12| GND| —| Ground
13| GND| —| Ground
14| RSV| —| Reserved; cannot connect ground or powersupply or an output interface
15| RXD3| I| UART3 input
16| TXD3| O| UART3 output
17| BIF| —| Built-in function; recommended to add a through-hole testing point and a 10 kΩ pull-up resistor; cannot connect ground or powersupply or peripheral I/O, but can be floating.
18| SDA| I/O| I2C data
19| SCL| I/O| I2C clock
20| TXD1| O| UART1 output
21| RXD1| I| UART1 input
22| V_BCKP2| I| 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 the working current is less than 60 μA at25 °C. If you do not use the hot start function, connect V_BCKP to VCC. Do NOT connect it toground or leave it floating.
23| VCC| I| Supply voltage
24| GND| —| Ground

Electrical Specifications

Absolute Maximum Ratings

Table 2-2 Absolute Maximum Ratings

Operating Conditions

Table 2-3 Operational Conditions

Parameter| Symbol| Min.| Typ.| Max.| Unit| Condition
---|---|---|---|---|---|---
Power Supply (VCC)| VCC| 3.0| 3.3| 3.6| V|
Maximum Ripple Voltage| Vrpp| 0| | 50| mV|
Working Current3| Iopr| | 126| 218| mA| VCC = 3.3 V
VCC_RF Output Voltage| VCC_RF| | VCC-0.1| | V|
VCC_RF Output Current| ICC_RF| | | 50| mA|
Operating Temperature| Topr| -40| | 85| °C|
Power Consumption| P| | 415| | mW|

IO Threshold

Table 2-4 IO Threshold

Parameter| Symbol| Min.| Typ.| Max.| Unit| Condition
---|---|---|---|---|---|---
Low Level InputVoltage| Vin_low| 0| | VCC × 0.2| V|
High Level InputVoltage| Vin_high| VCC × 0.7| | VCC + 0.2| V|
Low Level OutputVoltage| Vout_low| 0| | 0.45| V| Iout= 4 mA
High Level OutputVoltage| Vout_high| VCC – 0.45| | VCC| V| Iout =4 mA

Antenna Feature

Table 2-5 Antenna Feature

Parameter| Symbol| Min.| Typ.| Max.| Unit| Condition
---|---|---|---|---|---|---
Optimum Input Gain| Gant| 18| 30| 36| dB|

3 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

Dimensions

Table 2-6 Dimensions

Figure 2-2 UM960L Mechanical Dimensions

Hardware Design

Recommended Minimal Design

Figure 3-1 UM960L Minimal Design

Remarks:

• 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 total inductance should be no less than 30 μF
• R1: 10 kΩ resistor is recommended

Antenna Feed Design

UM960L just supports feeding the antennal from the outside of the module rather than 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.

Figure 3-2 UM960L External Antenna Feed Reference Circuit

Remarks:

• L1: feed inductor, 68nH RF inductor in 0603 package is recommended.
• C1: decoupling capacitor, it is recommended to connect two capacitors of 100nF/100pF in parallel.
• C2: DC blocking capacitor, recommended 100pF capacitor.
• Not recommended to take VCC_RF as ANT_BIAS to feed the antenna (VCC_RF is not optimized for the anti-lightning strike and anti-surge due to the compact size of the module).
• D1: ESD diode, choose the ESD protection device that supports high frequency signals (above 2000 MHz).
• D2: TVS diode, choose the TVS diode with appropriate clamping specification according to the requirement of feed voltage and antenna voltage.

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.
• VCC power-on waveform: The time interval from 10% rising to 90% must be within 100 μs to 1 ms.
• 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.
• V_BCKP power-on waveform: The time interval from 10% rising to 90% must be within 100 μs to 1 ms.
• 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.

Grounding and Heat Dissipation

Figure 3-3 Grounding and Heat Dissipation Pad

The 55 pads in the rectangle in Figure 3-3 are for grounding and heat dissipation.

In the PCB design, they must be connected to a large sized ground to strengthen the heat dissipation.

Recommended PCB Package Design

See the following figure for the recommended PCB package design of the module UM960L.

Figure 3-4 Recommended PCB Package Design

Remark:

• For the convenience of testing, the soldering pads of the pins are designed long, exceeding the module border much more. For example:
  • The pads denoted as detail C are 1.50 mm longer than the module border.
  • The pad denoted as detail A is 0.49 mm longer than the module border. It is relatively short as it is an RF pin pad, so we hope the trace on the surface is as short as possible to reduce the impact of interference.
• In order to effectively reduce the possibility of solder bridge during the soldering, the pin pads are designed narrower than the pins. However, the pad denoted as detail A has the same width as the pin, as we hope the resistance is as continuous as possible at the RF pin.

Production Requirement

Recommended soldering temperature curve is as follows:

Figure 4-1 Soldering Temperature (Lead-free)

Temperature Rising Stage

• Rising slope: Max. 3 °C/s
• Rising temperature range: 50 °C to 150 °C

Preheating Stage

• Preheating time: 60 s to 120 s
• Preheating temperature range: 150 ° C to 180 °C

Reflux Stage

• Over melting temperature (217 °C) time: 40 s to 60 s
• Peak temperature for soldering: no higher than 245 ° C

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, that is, better not 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.

Packaging

Label Description

Figure 5-1 Label Description

Product Packaging

The UM960L 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. As packaging materials such as the carrier tape can only withstand the temperature of 55 °C, modules shall be removed from the package during baking.

Figure 5-2 UM960L Package

Table 5-1 Package Description

Width: 24 mmThickness: 2.0 mm
Carrier Tape| Space between (center-to-center distance): 20 mm

The UM960L is rated at MSL level 3. Refer to the relevant IPC/JEDEC J-STD-033 standards for the package and operation requirements. You may access to the website www.jedec.org to get more information.

The shelf life of the UM960L module packaged in vacuum-sealed aluminum foil antistatic bags is one year.

Unicore Communications, Inc.

F3, No.7, Fengxian East Road, Haidian, Beijing, P.R.China, 100094
www.unicorecomm.com
Phone: 86-10-69939800
Fax: 86-10-69939888
info@unicorecomm.com

References

• 百度翻译-200种语言互译、沟通全世界！
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• 和芯星通北斗导航芯片-北斗导航模块北斗高精度定位板卡国内外领先的芯片、OEM板卡和产品解决方案提供商
• 和芯星通北斗导航芯片-北斗导航模块北斗高精度定位板卡国内外领先的芯片、OEM板卡和产品解决方案提供商
• Home | JEDEC

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