UNICORECOMM UM220-IV NV-GN User manual

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

i
Revision History
Version
Revision History
Date
Ver. 1.0 .0
Primary.《Unicorecomm UM220-IV NV-GN user manual》
Version 1.0
Dec.2017
Ver. 1.0.1
Alpha release. Update definition name and performance
parameter of pins
Oct.2018
Ver. 1.0.2
Alpha release. Update reflow soldering information; Update
product label description;
Update product Mechanical Layout;
May.2019
R1.1
Chapter 4.1: revise the frequency range in the description of
antenna position
Chapter 6.2 Package description: add the shelf life
Sep. 2019
R2
Chapter 6.2: revise the MSL instructions
Revise the following parameters: power consumption, Iccp,
IACQ and Input VSWR
1.1 Overview：add the product PN and HW version
Feb. 2020
R3
Update parameters
Feb. 2020
R3.1
Add description on reset and 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 NV-GN User Manual
ii
Foreword
This document offers you information in the features of the hardware, the installation,
specification and use of UNICORECOMM UM220-IV NV-GN 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 file
This document includes the following:
Introduction: Briefly explaining the functions, performances and installation 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
Mechanical Features: Offering UM220-IV NV-GN dimensions, layout, and top views.

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
3.5 PCB PACKAGING ............................................................................................................................. 8
4HARDWARE DESIGN ........................................ 9
4.1 DESIGN IN CONSIDERATIONS ............................................................................................................ 9
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 NV-GN is a multisystem GNSS module. It is designed on the
basis of UNICORECOMM’s low power GNSS SoC-UFirebirdTM and supports GPS L1+BDS
B1/GLONASS+Galileo+QZSS dual-system joint positioning or single system positioning. It
can receive the QZSS signal and support AGNSS. When connected to network, the
positioning speed will be improved by UNICORECOMM’s assist data service.
UM220-IV NV-GN 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.
Figure 1-1 UM220-IV NV-GN Module Diagram
Model
PN
HW
Ver.
Standard
System
Interface
Data
Updating
Rate
Professional
Automotive
GPS
BDS/GLONASS
Galileo
QZSS
SBAS
UART1
UART2
UM220-IV NV-GN
2310408000023
2.0
1Hz
*Only supported by the firmware with revision of 3.4.0 or above
Notice: Module order number (GN) is displayed in the lower left corner of the module (see
chapter 6.1). Automotive grade product is certified by AEC-Q100 and TS16949. The operating
temperature range of automotive grade and industrial grade product is -40℃~ +85℃.

UM220-IV NV-GN User Manual
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1.2 Key Features
Power
Voltage
+2.8~3.6 VDC
Power Consumption1
90mW
RF Input
Input VSWR
≤2.5
Input Impedance
50Ω
Antenna Gain
15～30dB
Physical Characters
Dimension
16.0*12.2*2.4mm
Weight
0.8g
Environment
Operating Temperature
-40℃~ +85℃
Storage Temperature
-45℃~ +90℃
RoHS
Accord
Input/ Output Data Interface
UART
2 UART, LVTTL. Acceptable baud rate 9600 460800bps
GNSS Performance
Frequency
BDS B1: 1561.098MHZ
GPS L1: 1575.42MHZ
GLO L1: 1602.5625MHZ
Time to First Fix
TTFF
Cold Start: 28s
Hot Start: 1s
Reacquisition: 1s
AGNSS2: 4s
Positioning Accuracy3
2.0m (Dual system horizontal, open sky)
3.5m (Dual system vertical, open sky)
Velocity Accuracy (RMS)
0.1m/s(Dual system horizontal, open sky)
Sensitivity4
GN
BDS
GPS
GLONASS
Tracking
-161dBm
-159dBm
-161dBm
-158dBm
Acquisition
-147dBm
-144dBm
-147dBm
-142dBm
Hot Start
-154dBm
-149dBm
-154dBm
-148dBm
Reacquisition
-157dBm
-156dBm
-157dBm
-153dBm
1PPS(RMS) 5
20ns
Data Update Rate
1Hz
Data Output6
NMEA 0183，Unicore Protocol
1
Continuous positioning，typical value
2
Timely input of assist data
3
CEP, 50%
4
When C/N0 is 41db
5
1 hour statistics，timing is not recommended
6
Configurable，refer to《Unicore NPL Protocol Specification Ver.3.1》document or update version for details

3
1.3 Interface
GNSS IC
LNA SAW
TCXO
Battery
RTC
Crystal
RESET_N
UART
PPS
UM220-IV
NV
Figure 1-2 Structure Chart
UART
UM220-IV NV-GN module COM1 is the primary serial port, which supports data transfer and
firmware upgrade function. The signal input/output level is LVTTL. The default baud rate is
115200bps, which is adjustable, and can be configured up to 460800bps. During design in, please
ensure that COM1 is connected to a PC or an external processor for firmware upgrades.
COM2 only supports data transmission, and cannot be used for firmware upgrade purpose. It is
reserved for future use.
1PPS
UM220-IV NV-GN outputs 1PPS with adjustable pulse width and polarity.

UM220-IV NV-GN User Manual
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2Product Installation
2.1 Installation Preparation
UM220-IV NV-GN 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
prevent the damage of ESD
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 NV-GN EVK suites
Figure 2-1
Please check the contents of the package carefully after receiving the package of UM220-IV NV-
GN.
UM220-IV NV-GN EVK suite (with AC Adapter)
UM220-IV NV-GN User manual
uSTAR application package
Qualified antenna
Antenna connection cable
Direct serial cable
PC or Laptop with serial ports (Win7 or above)
Please keep the box and anti-static plastic bags for storage and handling
Antenna
Receiver or the built-in
UM220-IV NV-GN EVK

5
2.2 Hardware Installation
After the above preparations, 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 NV-GN evaluation kit;
Step 3：Select the GNSS antenna with appropriate gain, fix it in a non-block area, using the
appropriate cable to connect the antenna with 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 NV-GN;
Step 6：Run the uSTAR
Step 7：Control the receiver through uSTAR to display constellations view, log messages, and
receiver status.

UM220-IV NV-GN 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
℃
MSL
□Level 1 □Level 2 ■Level 3 □TBD
3.2 Operation Condition
Item
Pin
Min
Typical
Max
Unit
Condition
Power Supply(VCC)
Vcc
2.8
3.3
3.6
V
Peak Current
Iccp
60
mA
Vcc = 3.0 V
Tracking Average Current
IACQ
28
30
32
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
Noise Figure
Nftot
2
dB
Operating Temperature
Topr
-40
85
℃
3.3 Dimensions
Table 3-1: Dimensions
Symbol
Min (mm)
Type (mm)
Max (mm)
A
15.9
16.0
16.5
B
12.05
12.2
12.35
C
2.2
2.4
2.6
D
0.9
1.0
1.3
E
1.0
1.1
1.2
F
2.9
3.0
3.1
G
0.9
1.0
1.3
H
0.7
0.8
0.9
K (Outside the hole)
0.7
0.8
0.9
N (Inside the hole)
0.4
0.5
0.6
M
0.8
0.9
1.0

7
Figure 3-1 Mechanical Layout
3.4 Pin Definition (Top View)
NC
NC
TXD1
RXD1
VCC
TIME PULSE
NC
NC
NC
NC
AADET_N
nRESET
VCC_RF
GND
RF_IN
GND
V_BCKP
GND
GND
NC
GPIO2
TXD2
RXD2
NC
Top View
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Figure 3-2 UM220-IV NV-GN Top View
No
Name
I/O
Electrical level
Description
1
nRESET
I
LVTTL
For reset, Low level active, if you do not use
the pin, please leave it hanging
2
AADET_N
I
LVTTL
Antenna detection
3
TIMEPULSE
O
LVTTL
Time pulse(1PPS)
4
NC
I
LVTTL
reserve
5
GPIO2
I
LVTTL
Antenna detection
6
TXD2
O
LVTTL
UART 2-TX
7
RXD2
I
LVTTL
UART 2-RX
8
NC
reserve

UM220-IV NV-GN User Manual
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No
Name
I/O
Electrical level
Description
9
VCC_RF
O
=VCC
Output voltage RF section
10
GND
—
Ground
11
RF_IN
I
GNSS signal input (BDS B1+GPS L1, GPS
L1+GLONASS L1）
12
GND
—
Ground
13
GND
—
Ground
14
NC
reserve
15
NC
reserve
16
NC
reserve
17
NC
reserve
18
NC
I/O
LVTTL
reserve
19
NC
I/O
LVTTL
reserve
20
TXD1
O
LVTTL
UART 1-TX
21
RXD1
I
LVTTL
UART 1-RX
22
V_BCKP
I
1.4V~3.6V
Backup voltage supply
23
VCC
—
2.8V~3.6 V
Main power
24
GND
—
Ground
3.5 PCB Packaging
Figure 3-3 UM220-IV NV-GN Recommended PCB Packaging (unit: mil, in brackets: mm)
In the design of PCB solder, make sure the area of the UM220-IV NV-GN modules are fully covered
with solder layer

9
4Hardware Design
4.1 Design in Considerations
To make UM220-IV NV-GN work normally, please properly connect the following:
Connect all the GND pins to 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 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 NV module
Antenna interface: Make sure the antenna impedance matches, and the cable is short and
smooth, 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 the electromagnetic
radiation in the frequency range of 1559 ~ 1607MHz
Try to avoid designing in any circuits underneath UM220-IV NV-GN
This module is a temperature sensitive device, dramatic changes in temperature will result
in reduced performance. Keep it away as far as possible from any high-power high-

UM220-IV NV-GN User Manual
10
temperature air and heating devices.
4.2 Avoid Power Connection
Module input ports of UM220-IV NV-GN 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 by the module is
in a high-resistance state or a low level to avoid power connection.
4.3 Reset
If the reset pin nRESET of UM220-IV NV-GN module needs to be used, the following timing
requirements must be met between the nRESET and the power supply VCC. During normal
operation of the module, pulling down the nRESET pin over the 5ms can also reset the UM220-IV
NV-GN.
VCC
nRESET
> 5ms
Figure 4-1 UM220-IV NV-GN Reset Requirement
4.4 Antenna
If UM220-IV NV-GN uses s +3V active antenna, it is suggested to use the VCC_RF pin output to
power the antenna through a feed inductor.

11
UM220 -IV NV-GN
RF_IN
VCC_RF
Figure 4-2 UM220-IV NV-GN Active Antenna +3V Solution
If the UM220-IV NV-GN 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 NV-GN
RF_IN
VCC_RF
Figure 4-3 UM220-IV NV-GN Active Antenna (Other Than +3V) Solution
If UM220-IV NV-GN uses a passive antenna, the antenna should be directly connected to
RF_IN pin, while 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.
UM220 -IV NV-GN
RF_IN
VCC_RF
Figure 4-4 UM220-IV NV-GN Passive Antenna Solution
4.5 Serial Port
UM220-IV NV-GN has two LVTTL serial ports, for PC connection, please use a RS232 voltage
level converter.

UM220-IV NV-GN User Manual
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UM220-IV
NV-GN
PC
RS232
UART2
UART1
RS232 2
RS232 1
Figure 4-5 Connect COM to PC
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
module), or it may lead to module damage.
6Package
6.1 Product Label Description
6.2 Package Description
The UM220-IV NV-GN module is packaged in vacuum sealed aluminum foil anti-static bag
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 should be removed from the packaging during baking.

13
Figure 6-1 Module Package
Item
description
Module
500pics/reel
Reel Size
workpiece tray:13"
external diameter 330mm, internal diameter 100mm, wide 24mm,
thickness 2.0mm
Carrier Tape
Space between:20mm
Check the humidity indicator card before soldering. The 30% indication is blue for 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 NV-GN modules are rated at MSL level 3. For
more MSL information, please visit www.jedec.org.
Figure 6-2 The 30% Indication Is Blue

UM220-IV NV-GN User Manual
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Figure 6-3 The 30% Indication Is Pink
The shelf life of UM220-IV NV-GN is one year.
7Clean
Do not use alcohol or other organic solvents to clean, or it may lead to fluid residues seeping
into 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).
Figure 8-1 Reflow Soldering Profile
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