UNICORECOMM UM220-IV M0 User manual

WWW.UNICORECOMM.COM
INSTALLATION AND OPERATION
USER MANUAL
Data subject to change without notice.
Communications, Inc.
UM220-IV M0
Copyright© 2009-2021, Unicore
Positioning Module
Industry Grade Multi-GNSS

i
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
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.
© Copyright 2009-2021 Unicore Communications, Inc. All rights reserved.

UM220-IV M0 User Manual
ii
Foreword
This document offers you information in the features of the hardware, the installation,
specification and use of 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 explaining the functions, performances and installing of the product
Installation: Containing 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 hardware interface of the product
module disassembly introduction.
Package: Provide packing instructions of UM220-IV M0 modules

i
Contents
1INTRODUCTION ....................................... 1
1.1 OVERVIEW.........................................................................................................................1
1.2 KEY FEATURES..................................................................................................................2
1.3 INTERFACE........................................................................................................................3
2PRODUCT INSTALLATION .............................. 4
2.1 INSTALLATION PREPARATION............................................................................................4
2.2 HARDWARE INSTALLATION................................................................................................5
3TECHNICAL SPECIFICATIONS ........................... 6
3.1 ELECTRICAL SPECIFICATIONS............................................................................................6
3.2 OPERATION CONDITION.....................................................................................................6
3.3 DIMENSIONS .....................................................................................................................6
3.4 PIN DEFINITION (TOP VIEW)..............................................................................................7
4HARDWARE DESIGN ................................... 8
4.1 DESIGN IN CONSIDERATIONS .............................................................................................8
4.2 AVOID POWER CONNECTION............................................................................................10
4.3 ANTENNA........................................................................................................................10
4.4 SERIAL PORT ..................................................................................................................11
5DISASSEMBLY ....................................... 12
6PACKAGE ........................................... 12
6.1 PRODUCT LABEL DESCRIPTION........................................................................................12
6.2 PACKAGE DESCRIPTION ..................................................................................................12
7CLEAN .............................................. 14
8REFLOW SOLDERING.................................. 14

1
1Introduction
1.1 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
designed. 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.
Figure 1-1 UM220-IV M0 Module
Model
PN
Grade
System
Interface
Data
Updating
Rate
Industry
Automotive
GPS
BDS/GLONASS
UART1
UART2
UM220-IV M0
2310408000024
●
●
●
●
1Hz

UM220-IV M0 User Manual
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1.2 Key Features
Power
Voltage
+2.8~3.6 VDC
Power Consumption
90mW
RF Input
Input VSWR
≤1.5
Input Impedance
50Ω
Antenna Gain
15～30dB
Physical Characters
Dimension
10.1*9.7*2.2mm
Environment
Operating Temperature
-40℃~ +85℃
Storage Temperature
-45℃~ +90℃
RoHS
Compliant
Input/output Data Interface
UART
1 UART, LVTTL. Baud rate 4800～115200bps
GNSS Performance
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
1
Assist date input
2
CEP, 50%

3
1.3 Interface
GNSS IC
SAW
TCXO
Battery
RTC
Crystal
RESET_N
UART
PPS
UM220-IV
M0
LNA
Figure 1-2 Structure Chart
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.

UM220-IV M0 User Manual
4
2Product Installation
2.1 Installation Preparation
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.
Figure 2-1
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
UM220-IV M0
Antenna

5
Please keep the box and anti-static plastic bags for storage and handling.
2.2 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.

UM220-IV M0 User Manual
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3Technical Specifications
3.1 Electrical Specifications
Absolute Maximum Ratings
Item
Pin
Min
Max
Unit
Condition
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
3.2 Operation Condition
Item
Pin
Min
Typical
Value
Max
Unit
Condition
Power Supply (VCC)
Vcc
2.8
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
℃
3.3 Dimensions
Table 3-1: 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

7
Symbol
Min (mm)
Typical Value (mm)
Max (mm)
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
Figure 3-1 Mechanical Layout
3.4 Pin Definition (Top View)
GND
NC
VCC_RF
NC
NC
RXD
TIMEPULSE
GND
TXD
GND
nRESET
NC
NC
RF_IN
NC
V_BCKP
VCC_IO
VCC
Top View
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
Figure 3-2 UM220-IV M0

UM220-IV M0 User Manual
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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
1.4V~3.6V
Voltage for RTC
7
VCC_IO
I
2.8V~3.6V
GPIO power supply
8
VCC
I
2.8V~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
17
NC
I/O
Reserve
18
NC
I/O
Reserve
4Hardware Design
4.1 Design in Considerations
To make UM220-IV M0 work normally, you need to properly connect the following:
The Module VCC has good monotonicity. If the VCC power off and then on, the power
off time must be more than 10ms.
It is recommended that a 1KΩ resistance should be connected in series to RX, a
33Ω or 1 KΩ resistance should be connected in series to TX, and a 4.7K resistor
should be connected in series to other necessary PIO in the Pin.
Connect all the GND pins to ground.
Connect the RF_IN signal to the antenna, and the line will keep 50Ω impedance
3
VCC_RF does not have short circuit detection function;

9
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 power supply
−Try to place LDO close to the module in layout
−Widen the power circuit or use 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 main equipment
match that of 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.

UM220-IV M0 User Manual
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4.2 Avoid Power Connection
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 the
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 power connection. Or to connect a
1KΩ resistor in series to RX, a 33Ω or 1KΩresistor to TX, and a 4.7KΩ resistor to other
necessary PIO in the Pin.
4.3 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.
UM220 -IV M0
RF_IN
VCC_RF
Figure 4-1 UM220-IV M0 Active Antenna +3V Solution
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.
V_BIAS
UM220 -IV M0
RF_IN
VCC_RF
Figure 4-2 UM220-IV M0 Active Antenna (Other than +3V) Solution
If UM220-IV M0 uses a passive antenna, and the antenna is directly connected to
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.

11
UM220 -IV M0
RF_IN
VCC_RF
Figure 4-3 UM220-IV M0 Passive Antenna Solution
4.4 Serial Port
UM220-IV M0 has one LVTTL serial port, for PC connection, please use a RS232 voltage
level converter.
UM220-IV
M0
PC
RS232
UART1 RS232 1
Figure 4-4 Connect COM to PC

UM220-IV M0 User Manual
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5Disassembly
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 an 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), may lead to module damage.
6Package
6.1 Product Label Description
6.2 Package Description
The UM220-IV M0 modules are packaged in vacuum sealed aluminum foil anti-static
bags with desiccant and moisture-proof agent. When using reflow welding process
to weld modules, please strictly comply with IPC standard to conduct humidity
control on modules. As packaging materials such as carrier belt can only withstand
the temperature of 65 degrees Celsius, modules shall be removed from the packaging
during baking.

13
Figure 6-1 UM220 package
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 firstly 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.
Figure 6-2 the 30% indication is blue

UM220-IV M0 User Manual
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Figure 6-3 the 30% indication is pink
The shelf life of UM220-IV M0 is one year.
7Clean
Do not use alcohol or other organic solvents to clean, or it may leave fluid residues in
the shielding shell, causing mildew and other problems.
8Reflow Soldering
In order to avoid device falling off, the module should be placed on the top of the main
board during welding. 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.
Figure 8-1 Reflow Soldering Line
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.

www.unicorecomm.com
和芯星通科技（北京）有限公司
Unicore Communications, Inc.
www.unicorecomm.com
Phone: [phone]
Fax: [phone]
[e-mail]
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