unicore UM220-IV M0 Industry Grade Multi-GNSS Positioning Module User Manual

: June 9, 2024
: unicore

unicore UM220-IV M0 Industry Grade Multi-GNSS Positioning Module

Product Information

The UM220-IV M0 is an industry-grade multi-GNSS positioning module. It is designed to provide high-precision and reliable positioning information for various applications. The module supports multiple GNSS systems including GPS, GLONASS, BeiDou, Galileo, QZSS, and SBAS. It also features low power consumption, high sensitivity, and fast time-to-first-fix performance.

The module has gone through several revisions, with the latest version being R2.4 as of November 2022. The revisions include updates to pin definition, module size, shelf life, CE logo, hardware version, power supply and antenna specifications.

Revision History

Version	Revision	Date
Ver.1.0.0	Primary version	Jun.2018
Ver.1.0.1	Alpha release, Revised Pin definition	Oct.2018
Ver.1.0.2	Revised module size	Dec.2018
Ver.1.0.4	Beta release, align with Chinese version 1.0.4	Aug. 2019
R1.1	Chapter 6.2: add shelf life	Sep. 2019
R1.2	Chapter 6.2: revise the MSL instructions

Add CE logo

| Jan. 2020
R1.3| Add a footnote to elaborate CEP| Oct. 2020
R2| Hardware version 2.3 released, update the related

parameters

| Dec. 2020
R2.1| Add the descriptions of SMT stencil| Jun. 2021

R2.2

| Update power supply VCC and V_BCKP;

Add different PN information and corresponding solutions to avoid string power

| ****

Nov. 2021

R2.3| Add the Note in Section 4.3| Nov. 2021
R2.4| If hot start is not used, connect V_BCKP to VCC.

Revise the VSWR in section 1.2

| Nov. 2022

Disclaimer
Information in this document is subject to change without notices and does not represent a commitment on the part of Unicore Communication, Inc. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose without the express written permission of a duly authorized representative of Unicore Communications, Inc. The information contained within this manual is believed to be true and correct at the time of publication.

Foreword
This document offers you information in the features of the hardware, the installation, specification and use of the UNICORECOMM UM220-IV M0 product.

Readers It Applies to
This document is applied to the technicians who know GNSS Receiver to some extent but not to the general readers.

Structure of the Document

This document includes the following:
Introduction: Briefly explain the functions, performances and installation of the product
Installation: Contains the list of the product package and the details of product installation
Technical Specification: Offering technical specifications of the product
Hardware Specification: Offering all the information of the hardware interface of the product Module disassembly introduction
Package: Provide packing instructions of UM220-IV M0 modules

Introduction

Overview
UNICORECOMM UM220-IV M0 is a dual-system GNSS module. It is designed on the basis of UNICORECOMM’s low-power, multisystem, high-performance SoC-UFirebird design. It supports BDS B1+GPS L1 dual-system joint positioning and single- system positioning. UM220-IV M0 is compact in size and uses SMT pads to support fully automatic integration of standard discharge and reflow soldering, especially suitable for low-cost and low-power consumption fields. The radio equipment is in compliance with Directive 2014/53/EU.

Model| PN| Grade| System| Interface| Data Updating Rate
---|---|---|---|---|---
Industry| Automotive| GPS| BDS| GLONASS| UART1| UART2|
UM220-IV M0| 2310408000024| ●| | ●| ●| ●| ●| | 1Hz
UM220-IV M0| 2330322000028| ●| | ●| ●| | ●| | 1Hz

Key Features

Power

Frequency

| BDS B1: 1561.098MHz GPS L1: 1575.42MHz

TTFF

| Cold Start: 28s Hot Start: 1s Reacquisition: 1s AGNSS1: 4s

Positioning Accuracy2

| 2.0m (dual-system horizontal, open sky) 3.5m (dual-system vertical, open sky)
Velocity Accuracy (RMS)| 0.1m/s (dual-system, Open sky)

Sensitivity

| | BDS| GPS
---|---|---|---
Tracking| -161dBm| -161dBm
Acquisition| -146dBm| -147dBm
Hot start| -154dBm| -155dBm
Reacquisition| -157dBm| -158dBm
1PPS Accuracy (RMS)| 20ns| |
Data Updating Rate| 1Hz| |
Data Output| NMEA 0183, Unicore Protocol|

Interface

UART
UM220-IV M0 module supports data transfer and firmware upgrade; the signal input/output level is LVTTL. The default baud rate is 9600bps, which is adjustable, and can be configured up to 115200bps.

1PPS
UM220-IV M0 outputs 1PPS with adjustable pulse width and polarity.

Product Usage Instructions

Installation Preparation

Read the installation preparation section in the user manual.
Install the module hardware according to the instructions in the user manual.

UM220-IV M0 modules are Electrostatic Sensitive Devices and require special precautions when handling.

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 carried out on an antistatic workbench, wear an antistatic wrist strap and use a conductive foam pad. If an antistatic workbench is not available, wear an antistatic wrist strap and connect the other end to a metal frame to play a role in anti-static.
Hold the edge of the module, not in direct contact with the components.
Please check carefully whether the module has obviously loose or damaged components. If you have questions, please contact us or your local dealer.

Figure 2-1 shows the typical installation of UM220-IV M0 EVK suites.

Please check the contents of the package carefully after receiving the package of UM220-IV M0:

UM220-IV M0 EVK suite（with AC Adapter）
UM220-IV M0 User manual.
uSTAR application package.
Antenna.
Antenna connection cable
Direct serial cable
PC

Hardware Installation

After the above preparations are complete, follow the steps below to install:

Step 1： Make sure to take full anti-static measures, such as wearing an anti-static wrist strap, grounding the workbench;
Step 2： Open the UM220-IV M0 evaluation kit;
Step 3： Select the GNSS antenna with appropriate gain, fix it in the non-block area, using the appropriate cable to connect the antenna to UM220 EVK;
Step 4： Connect the PC to the EVK serial port through direct serial cable;
Step 5： Power the evaluation board and initialize the UM220-IV M0;
Step 6： Open the uSTAR
Step 7： Controlled the receiver through uSTAR to display constellations view, log messages, and receiver status.

Technical Specifications

Check the electrical specifications to ensure compatibility with your system.
Verify that the operating conditions are within the recommended range.
Refer to the pin definition section for proper connections.

Electrical Specifications
Absolute Maximum Ratings

Item	Pin	Min	Max	Unit
Power Supply (VCC)	Vcc	-0.5	3.6	V
VCC Ripple	Vrpp		50	mV
Digital IO	Vin	-0.5	Vcc +0.2	V
Storage Temperature	Tstg	-45	90	℃
MSD (MSL)	□Level 1 □Level 2 ■Level 3 □TBD

Operation Condition

Item| Pin| Min| Typical Value| Max| Unit| Condition
---|---|---|---|---|---|---
Power Supply (VCC)| Vcc| 3.0| 3.3| 3.6| V|
Peak Current| Iccp| | | 53| mA| Vcc=3.0 V
Tracking Average

Current

| IACQ| 29| 30| 31| mA| Vcc=3.0V
Low Level Input Voltage| Vin_low| | | 0.7| V|
High Level Input

Voltage

| Vin_high| 1.2| | | V|
Low Level Output

Voltage

| Vout_low| | | 0.4| V| Iout=-8 mA
High Level Output

Voltage

| Vout_high| Vcc–0.4| | | V| Iout=8 mA
Antenna Gain| Gant| 15| | 30| dB|
Nosie Figure| Nftot| | 2| | dB|
Operation Temperature| Topr| -40| | 85| ℃|

Dimensions

Symbol	Min (mm)	Typical Value (mm)	Max (mm)
A	9.6	10.1	10.7
B	9.55	9.7	9.85
C	1.9	2.0	2.1
D	0.55	0.65	0.95
E	1.0	1.1	1.2
F	0.5	0.6	0.7
G	0.3	0.4	0.5
H	0.9	1.0	1.1
K	0.6	0.7	0.8
M	0.7	0.8	0.9

Pin Definition (Top View)

No	Name	I/O	Electrical level	Description
1	GND	I		Ground
2	TXD	O	LVTTL	UART 1-TX
3	RXD	I	LVTTL	UART 1-RX
4	TIMEPULSE	O	LVTTL	1PPS
5	NC	I	LVTTL	Reserve

6

| ****

V_BCKP

| ****

I

| ****

1.65V~3.6V

| Voltage for RTC. If you do not use the hot start function, connect V_BCKP to VCC. Do NOT connect it to ground or leave it floating.
7| VCC_IO| I| 3.0V~3.6V| GPIO power supply
8| VCC| I| 3.0V~3.6V| Main power
9| nRESET| I| LVTTL| For reset, Low level active, if you do not

use the pin, please leave it hanging

10| GND| I| | Ground
11| RF_IN| I| | GNSS signal input (BDS B1+GPS L1）
12| GND| I| | Ground
13| NC| O| | Reserve
14| VCC_RF3| O| =VCC| Output voltage RF section
15| NC| I/O| | Reserve
16| NC| I/O| | Reserve
No| Name| I/O| Electrical level| Description
---|---|---|---|---
17| NC| I/O| | Reserve
18| NC| I/O| | Reserve

Hardware Design

Take into consideration the design considerations outlined in the user manual.
Avoid string power by following the instructions in section 4.2.
Refer to the antenna and serial port sections for proper use.

Design in Considerations

To make UM220-IV M0 work normally, you need to properly connect the following:

Module VCC has good monotonicity. If the VCC power is off and then on, the power of time must be more than 10ms.

Connect all the GND pins to the ground.
Connect the RF_IN signal to the antenna, and the line will keep 50Ω impedance matching.
Ensure COM1 is connected to a PC or an external processor, users can use this serial port to receive position data. COM1 is also necessary for firmware upgrades.

In order to obtain good performance, special concern should be paid during the design:

Power supply: Stable and low ripple power is necessary for good performance. Make sure the peak-to-peak voltage ripple does not exceed 50mV.
- Use LDO to ensure the purity of the power supply
- Try to place LDO close to the module in the layout
- Widen the power circuit or use a copper pour surface to transmit current
- Avoid walking through any high-power or high-inductance devices such as a magnetic coil
UART interfaces: Ensure that the signals and baud rate of the main equipment matches that of the UM220-IV M0 module
Antenna interface: Make sure the antenna impedance matches and the cable is short without any kinks, try to avoid acute angles
Antenna position: In order to ensure a good signal-to-noise ratio, the antenna should be well isolated from any electromagnetic radiation source, especially an electromagnetic radiation in the frequency range of 1559 ~ 1605MHz
Try to avoid designing in any circuits underneath UM220-IV M0
This module is a temperature-sensitive device. Dramatic changes in temperature will result in reduced performance, so keep it away as far as possible from any high-power high-temperature air and heating devices.

Avoid String Power
The module input ports of UM220-IV M0 include: RXD and GPIO. When the module is not powered on, if there is data input in the above ports, it will form a series of power on module VCC. When the series voltage is higher than 1.6V, it may cause a failure of starting up when the module is powered on.

Solution:
When the module is not powered on, make sure that the IO port connected to the module is in a high-resistance state or a low level to avoid string power. Another solution is to connect a 1KΩ resistor in series to the serial port RX, and connect a 33Ω or 1KΩ resistor in series to TX (There is no need to connect any resistor to the TX of the module with PN 2310408000024). It is also recommended to connect a 4.7KΩ resistor in series to the Pin of other necessary PIOs.

Antenna
If UM220-IV M0 uses a +3V active antenna, it is recommended to use the VCC_RF pin output to power the antenna through a feed inductor.

Note:
If the user has a high requirement for ESD (> ± 2000 V), the user should consider another method to feed the antenna rather than using the VCC_RF pin. In this case, it is recommended to choose a power supply chip with high ESD protection level. 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 ESD damage or other Electrical Over-Stress (EOS).

If the UM220-IV M0 uses an active antenna other than +3V, the bias voltage V_BIAS required by the antenna is supplied to the antenna through a feed inductor.

If UM220-IV M0 uses a passive antenna, and the antenna is directly connected to the RF_IN pin, the VCC_RF can be suspended. It should be noted that the use of passive antennas may cause a decrease in GNSS performance compared to active antennas.

Serial Port
UM220-IV M0 has one LVTTL serial port, for PC connection, please use an RS232 voltage level converter.

Disassembly

When it is necessary to remove the module, it is recommended to melt the soldering tin of the pins on both sides of the module with electric soldering iron and remove the module with tweezers. Do not use other means to remove the module (such as using a hot air gun to blow the module), which may lead to module damage.

Refer to the disassembly section if necessary.
Check the package contents to ensure everything is included.

Package

Product Label Description

Package Description

The UM220-IV M0 modules are packaged in vacuum-sealed aluminum foil anti- static bags with desiccant and moisture-proof agents. When using the reflow welding process to weld modules, please strictly comply with IPC standards to conduct humidity control on modules. As packaging materials such as carrier belts can only withstand the temperature of 65 degrees Celsius, modules shall be removed from the packaging during baking.

Item	Description
Module	1000 pics/reel

Reel Size

| Workpiece tray: 13″

External diameter 330mm, internal diameter 100mm, width 24mm, thickness 2.0mm

Carrier Tape| Space between: 20mm

Check the humidity indicator card before soldering. The 30% indication is blue under normal conditions, as shown in figure 6-2. Bake modules first before soldering if the 30% indication turns pink, as shown in figure 6-3. The UM220-IV M0 modules are rated at MSL level 3, for more MSL information, please refer to www.jedec.org.

The shelf life of UM220-IV M0 is one year.

Clean

Do not use alcohol or other organic solvents to clean, or it may lead to 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 welding. A reflow soldering temperature curve is recommended as shown in figure 8-1 below (M705-GRN360 is recommended for solder paste). Note: the module can only be welded 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 0.15mm and 0.18mm is recommended.

For more detailed information, please refer to the UM220-IV M0

User Manual is available at www.unicorecomm.com.

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.