unicore UM621N Automotive Grade Dual-frequency Multi-GNSS Integrated Positioning Module User Manual

unicore UM621N Automotive Grade Dual-frequency Multi-GNSS Integrated

Positioning Module

Product Information: UM621N Automotive Grade Dual-frequency

Multi-GNSS Integrated Positioning Module
The UM621N is a high-performance positioning module specifically designed for automotive applications. It features dual-frequency multi-GNSS (Global Navigation Satellite System) technology that supports GPS, GLONASS, Galileo, and BeiDou signals. This module provides high-precision positioning solutions with fast acquisition and tracking capabilities even in challenging environments such as urban canyons and tunnels.

Key Specifications

• Dual-frequency multi-GNSS support : GPS L1/L2, GLONASS L1/L2, Galileo E1/E5b, BeiDou B1/B2a
• Horizontal position accuracy : 1.5 m CEP (50%) with SBAS enabled
• Time to first fix (TTFF): Cold start: < 45 s (typical); Hot start: < 1 s (typical)
• Operating temperature range : -40°C to +85°C
• Dimensions: 16.0 x 12.2 x 2.4 mm

Interfaces

• UART : Supports NMEA and UBX protocols
• I2C : Supports I2C master/slave mode
• PWM : Supports PMW signal output for timing applications
• ANT : Supports external active/passive antenna
• USB : Supports firmware upgrade and debugging

Product Usage Instructions

Product Installation:
Before installing the UM621N module, please ensure that you have the necessary tools and equipment to handle SMT (Surface Mount Technology) components. Follow these steps for hardware installation:

1. Prepare the PCB (Printed Circuit Board) layout according to the UM621N datasheet.
2. Apply solder paste to the designated pads on the PCB.
3. Place the UM621N module onto the solder paste with tweezers or a vacuum tool.
4. Reflow the PCB in a suitable oven according to the recommended temperature profile.
5. Inspect the solder joints under a microscope to ensure proper connection.

Usage

After installation, connect the UM621N module to your host system using the UART, I2C, or USB interface. You can use the NMEA or UBX protocol to communicate with the module and retrieve positioning data. You can also configure the module using UBX commands to optimize performance for your specific application. The UM621N module supports various modes of operation, including single GNSS, dual GNSS, and multi-GNSS modes. You can select the appropriate mode based on your application requirements. The module also supports SBAS (Satellite-Based Augmentation System) for enhanced positioning accuracy. For more information on product usage and configuration, refer to the UM621N User Manual and contact Unicore or their authorized distributors for technical support.

Introduction

Overview
UM621N is a GNSS dual-frequency module with MEMS integrated navigation. It is designed for automotive applications based on the multi-system, dual- frequency and high-performance GNSS SoC – UFirebird II (UC6580A), which is independently developed by Unicore Communications, Inc. With the built-in six- axis inertial navigation device, the module supports multi-system dual- frequency joint positioning and single system standalone positioning, and can output GNSS+MEMS combined positioning results continuously even in tunnels and underground garages. The chip of UM621N conforms to the requirements of AEC-Q100, and the manufacturing process is in line with IATF 16949

Model

|

Order ing Code

|

PN

|

Grade

|

System

|

Interface

| Data Update

Rate

---|---|---|---|---|---|---
Professional| Automotive| GPS| BDS| GLONASS| Galileo| NAVIC*| QZSS| SBAS| UART1| UART2| I2C| SPI|

UM621N

|

02

| 2310414

000008

|  |

●

|

●

|

●

|

●

|

●

|

●

|

●

|

●

|

●

|

●

|

●

|

●

| 1Hz/

10Hz/

20Hz*

• The default data update rate is 1Hz, which can be configured to 10 Hz or 20 Hz, and the 20 Hz needs to be supported by specific firmware.
• NAVIC is supported by specific firmware

**Key Specifications

**

Interfaces

UART
UART1 is the main serial port of UM621N, supporting data transmission and firmware upgrade, and the signal input/output voltage level is LVTTL. The baud rate can be configured by users flexibly, and the maximum is 460800bps. Ensure that UART1 is connected to a PC or an external processor for firmware upgrade. UART2 only supports data transmission and can’t be used for firmware upgrade.

MEMS
UM621N integrates a six-axis MEMS, a three-axis gyro and a three-axis accelerator. MEMS provides information on carrier attitude and speed changes, combined with GNSS data to output integrated positioning and navigation solution. The combination of GNSS+MEMS ensures better positioning performance than standalone GNSS, providing continuous and uninterrupted positioning, especially in the conditions with poor signals, such as tunnels, underground garages and urban canyons.

1PPS
UM621N outputs 1PPS with adjustable pulse width and polarity. 1PPS is not for timing application.

RESET
Active LOW, and the active time should be no less than 10 ms.

Product Installation

Preparations
UM621N modules are Electrostatic Sensitive Devices (ESD) and must be installed with special precautions when handling. Please take the following protective measures before opening the anti-static plastic box.

• Follow the steps in section 2.2 in the correct order.
• Electrostatic discharge (ESD) may cause damage to the device. All operations mentioned in this chapter should be performed on an antistatic workbench, using an antistatic wristband and a conductive foam pad. If the antistatic workbench is unavailable, wear an antistatic wristband and connect the other end to a metal frame to play a role in antistatic protection.
• Hold the edge of the module, and DO NOT touch any components of the module.
• Please check carefully whether the module is obviously loose or damaged. If there are any problems, please contact Unicore or the local dealer.

Please prepare the following items before installing UM621N.

• UM621N EVK (with AC Adapter)
• UM621N User Manual
• Unicore uSTAR software package
• Ancillary GNSS antenna
• USB cable and straight through serial cable
• PC or Laptop with serial ports (Windows 7 and above）
• Please keep the packing box and anti-static plastic box for storage and handling.

Hardware Installation
After the above preparations, please follow the steps below to install, which is used for satellite navigation test only.

1. Step 1 : Make sure to take full anti-static measures, such as wearing an anti-static wristband and grounding the workbench.
2. Step 2 : Open the UM621N evaluation kit and take out the evaluation board.
3. Step 3 : Use the GNSS antenna with appropriate gain and fix it in a non-blocking area; use the appropriate cable to connect the antenna with UM621N evaluation board.
4. Step 4 : Connect a PC to the EVK serial port through the USB cable or straight through serial cable.
5. Step 5 : Open uSTAR software on the PC.
6. Step 6 : Control the receiver through uSTAR to display constellations view, log messages, and receiver status, etc

Technical Specifications

Electrical Specifications

Absolute Maximum Ratings

Digital IO Voltage

|

-0.5

|

3.6

| V             Voltage of the digital signal pins

Antenna Input Power (RF_IN)

|

–

|

+3

| dBm        Maximum input power of antenna

Storage Temperature (TSTG)

|

-40

|

+85

| °C           Storage temperature for the

Operational Conditions

High Level Input Voltage       VIH                0.7*VCC VCC +        V
 |  |  |  | 0.2|  |
Low Level Output Voltage| VOL| 0|  | 0.4| V| Iout=-2 mA
High Level Output Voltage|

VOH

| VCC– 0.4|  |

VCC

|

V

|

Iout=2 mA

Antenna Gain| GANT| 15| 20| 30| dB|

Dimensions
The dimensions of UM621N are as follows

N (Inner edge of the     0.4                              0.5 0.6
stamp hole)|  |  |
M| 0.8| 0.9| 1.0

Pin Definition

PCB Packaging

When designing PCB solder mask, make sure that the area under UM621N is completely coated with solder mask.

Package

Label Description

Ordering Information

Package Description
The UM621N modules use carrier tape and reel (suitable for mainstream surface mount devices), packaged in vacuum-sealed aluminum foil antistatic bags, with desiccant inside to prevent moisture. When using reflow soldering process to solder the 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 degrees Celsius, modules shall be removed from the package during baking.

UM621N modules are rated at MSL level 3. Please refer to the relevant IPC/JEDEC standards for baking requirements. Users may access to the website www.jedec.org to get more information. The shelf life of UM621N modules packaged in vacuum-sealed aluminum foil antistatic bags is one year.

Clean
DO NOT use alcohol or other organic solvents to clean, which may lead to soldering flux residues flooding into the shielding shell, causing mildew and other problems.

Reflow Soldering
In order to avoid the device falling off, the module should be placed on the top of the main board during soldering. Reflow soldering temperature curve is recommended as shown in figure 6-1 below (M705-GRN360 is recommended for solder paste).

Note : The module can only be soldered once

Note : The apertures in the stencil need to meet the customer’s own design requirements and inspection specifications, and the thickness of the stencil should be above 0.15 mm. It is recommended to be 0.18 mm.

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

• Home | JEDEC
• Home | JEDEC
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