Unicore UM621N User Manual

1 Introduction

1.1 Overview

The UM621N is a GNSS dual-frequency module with integrated MEMS navigation, designed for automotive applications. It utilizes the high-performance UFirebird II (UC6580A) GNSS SoC, independently developed by Unicore Communications, Inc. The module features a built-in six-axis inertial navigation device, enabling multi-system dual-frequency joint positioning and single-system standalone positioning. It can output combined GNSS+MEMS positioning results continuously, even in challenging environments like tunnels, underground garages, and urban canyons with poor signal conditions.

The UM621N chip complies with AEC-Q100 requirements, and its manufacturing process adheres to IATF 16949 standards.

* NAVIC is supported by specific firmware.

* 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.

1.2 Key Specifications

Power

RF Input

Physical Characteristics

Environmental Specification

Input/Output Data Interface

GNSS Performance

* Items marked with an asterisk are supported by specific firmware.

1.3 Interfaces

The UM621N module supports several interfaces for communication and functionality:

• UART: UART1 is the primary serial port for data transmission and firmware upgrades, supporting LVTTL voltage levels and configurable baud rates up to 460800 bps. UART2 supports data transmission only and cannot be used for firmware upgrades.
• MEMS: The module integrates a six-axis MEMS sensor, including a three-axis gyro and a three-axis accelerometer. This provides carrier attitude and speed change information, enhancing positioning accuracy when combined with GNSS data, especially in signal-degraded environments.
• 1PPS: The UM621N outputs a 1PPS (Pulse Per Second) signal with adjustable pulse width and polarity, not intended for timing applications.
• nRESET: A reset pin that is active LOW. The active time must be at least 10 ms.

2 Product Installation

2.1 Preparations

UM621N modules are Electrostatic Sensitive Devices (ESD) and require careful handling. Follow these precautions:

• Perform all operations on an antistatic workbench using an antistatic wristband and a conductive foam pad. If a workbench is unavailable, wear a wristband and connect it to a metal frame for protection.
• Handle the module by its edges, avoiding contact with components.
• Inspect the module for any signs of looseness or damage before proceeding. Contact Unicore or a local dealer if issues are found.

Required items for installation:

• 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)

Keep the original packing box and anti-static plastic box for storage and handling.

2.2 Hardware Installation

Follow these steps for satellite navigation testing:

1. Ensure all anti-static measures are in place, including wearing an antistatic wristband and grounding the workbench.
2. Open the UM621N evaluation kit and remove the evaluation board.
3. Connect the GNSS antenna to the UM621N evaluation board using an appropriate cable. Ensure the antenna is placed in a non-blocking area.
4. Connect the PC to the EVK's serial port using either a USB cable or a straight-through serial cable.
5. Launch the uSTAR software on the PC.
6. Use the uSTAR software to control the receiver, view constellations, log messages, and check receiver status.

3 Technical Specifications

3.1 Electrical Specifications

Absolute Maximum Ratings

Operational Conditions

3.3 Dimensions

The dimensions of the UM621N module are as follows:

3.4 Pin Definition

3.5 PCB Packaging

When designing the PCB solder mask, ensure the area under the UM6215N is completely coated with solder mask.

4 Package

4.1 Label Description

The product label includes the following information:

• Product Model
• Serial Number
• Ordering Code
• Part Number (13 digits)
• Product QR Code

4.2 Ordering Information

4.3 Package Description

UM6215N modules are supplied using carrier tape and reel, suitable for surface mount devices. They are packaged in vacuum-sealed aluminum foil antistatic bags with desiccant to protect against moisture. For reflow soldering, adhere strictly to IPC standards for temperature and humidity control. The carrier tape can withstand temperatures up to 55°C; modules must be removed from the package before baking.

UM6215N modules are rated at MSL level 3. Refer to IPC/JEDEC standards for baking requirements. Visit www.jedec.org for more information.

The shelf life for UM6215N modules packaged in vacuum-sealed antistatic bags is one year.

5 Clean

Do not use alcohol or other organic solvents for cleaning. This can cause soldering flux residues to enter the shielding shell, leading to potential issues like mildew.

6 Reflow Soldering

To prevent the module from detaching during soldering, it should be placed on the top side of the main board. The recommended reflow soldering temperature curve is shown below (M705-GRN360 is recommended for solder paste). The module can only be soldered once.

Note: Stencil apertures must meet customer design requirements and inspection specifications. The recommended stencil thickness is 0.18 mm, with a minimum of 0.15 mm.