Ublox EVK-8 User manual

EVK-7 / EVK-8 / EVK-M8
Evaluation Kits (PCB Version C/D)
User Guide

Abstract
This document describes the structure and use of the EVK-7 / EVK-
8 / EVK M8 evaluation kits and
provides information for evaluating and testing u blox 7, u-blox 8 and u-
blox M8 positioning
technology.
www.u-blox.com
UBX-14002502 - R10

EVK-7 / EVK-8 / EVK-M8 - User Guide
UBX-14002502 - R10 Early Production Information Page 2 of 25
Document Information
Title EVK-7 / EVK-8 / EVK-M8
Subtitle User Guide
Document type User Guide
Document number UBX-14002502
Revision and date R10 3-Sep-2018
Document status Early Production Information
European Union regulatory compliance
EVK-7P, EVK-M8N, EVK-M8C, EVK-M8MEVA, EVK-M8QEVA and EVK-8N comply with all relevant requirements for RED
2014/53/EU. The relevant Declaration of Conformity (DoC) is available at www.u-blox.com within Support > Product
resources > Conformity Declaration.
This document applies to the following products:
Product name Type number Hardware version ROM/FLASH version EOL/PCN reference
EVK-7N EVK-7N-0-000 C ROM 1.00 Flash FW1.00 UBX-17049159 (EOL)
EVK-7C EVK-7C-0-000 C ROM 1.00, 1.01, Flash FW1.00 UBX-17049159 (EOL)
EVK-7P EVK-7P-0-000 C ROM 1.00 PPP1.01, Flash FW1.00 N/A
EVK-7EVA EVK-7EVA-0-000 C ROM 1.00 UBX-17049159 (EOL)
EVK-M8N EVK-M8N-0-01 D Flash SPG 3.01 N/A
EVK-M8C EVK-M8C-0-01 D Flash SPG 3.01 N/A
EVK-M8MEVA EVK-M8MEVA-0-01 D ROM SPG 3.01 N/A
EVK-M8QEVA EVK-M8QEVA-0-00 D ROM SPG 3.01 N/A
EVK-8N EVK-8N-0-00 D ROM SPG 3.01 N/A
u-blox or third parties may hold intellectual property rights in the products, names, logos and designs included in this
document. Copying, reproduction, modification or disclosure to third parties of this document or any part thereof is only
permitted with the
express written permission of u-blox.
The information contained herein is provided “as is” and u
-blox assumes no liability for its use. No warranty, either express or
implied, is given, including but not limited
to, with respect to the accuracy, correctness, reliability and fitness for a particular
purpose of the information. This document may be revised by u
-blox at any time without notice. For the most recent
documents, visit www.u
-blox.com.
Copyright © u
-blox AG.

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Contents
Contents .......................................................................................................................................................... 3
1Product description .............................................................................................................................. 4
1.1 Overview........................................................................................................................................................4
1.2 Kit includes...................................................................................................................................................4
1.3 Software and documentation...................................................................................................................4
1.3.1 u-center GNSS evaluation software ...............................................................................................5
1.4 System requirements ................................................................................................................................5
2Specifications ......................................................................................................................................... 6
2.1 Safety precautions .....................................................................................................................................6
3Getting Started ...................................................................................................................................... 7
3.1 Software installation..................................................................................................................................7
3.2 Hardware installation.................................................................................................................................7
3.3 Serial port default configuration..............................................................................................................7
4Device description ................................................................................................................................. 8
4.1 Interface connection and measurement................................................................................................8
4.2 Active antenna.............................................................................................................................................8
4.3 Evaluation unit.............................................................................................................................................8
4.3.1 Antenna connector............................................................................................................................. 9
4.3.2 USB ........................................................................................................................................................9
4.3.3 UART ..................................................................................................................................................... 9
4.3.4 Time Pulse............................................................................................................................................9
4.3.5 RST button.........................................................................................................................................10
4.3.6 Safe boot button...............................................................................................................................10
4.3.7 Slide Switch .......................................................................................................................................10
4.3.8 Test Connector .................................................................................................................................10
4.3.9 LED.......................................................................................................................................................12
4.3.10 Backup Battery..................................................................................................................................12
4.3.11 GNSS Configuration.........................................................................................................................12
4.3.12 RTC Configuration (EVK-7EVA and EVK-M8MEVA).................................................................12
5Measuring tracking current ............................................................................................................ 13
6Board layout.......................................................................................................................................... 14
6.1 PCB Version C ............................................................................................................................................14
6.2 PCB Version D ............................................................................................................................................16
7Schematic ............................................................................................................................................. 18
8Battery replacement ......................................................................................................................... 19
9Troubleshooting .................................................................................................................................. 20
10 Common evaluation pitfalls ............................................................................................................ 22
Related documents ................................................................................................................................... 23
Revision history .......................................................................................................................................... 24
Contact.......................................................................................................................................................... 25

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1Product description
1.1 Overview
EVK-7 / EVK-8 / EVK-M8 evaluation kits make evaluating the high performance u-blox 7, u-blox 8 and
u-blox M8 positioning products simple. The built-in USB interface provides both power supply and
high-speed data transfer, and eliminates the need for an external power supply. The u-blox
evaluation kits are compact, and their user friendly interface and power supply make them ideally
suited for use in laboratories, vehicles and outdoor locations. Furthermore, they can be used with a
PDA or a notebook PC, making them the perfect companion through all stages of design-in projects.
Evaluation Kit Description Suitable for
EVK-7N u-blox 7 Evaluation Kit with TCXO MAX-7Q; MAX-7W; NEO-7N
u-blox 7 GNSS chips with TCXO
EVK-7C u-blox 7 Evaluation Kit with Crystal MAX-7C; NEO-7M
u-blox 7 GNSS chips with Crystal
EVK-7P u-blox 7 Evaluation Kit with Precise Point Positioning NEO-7P
EVK-7EVA u-blox 7 Evaluation Kit with EVA-7M EVA-7M
EVK-M8N u-blox M8 Evaluation Kit with TCXO MAX-M8Q;MAX-M8W; NEO-M8N; NEO-M8Q; LEA-
M8S u-blox M8 concurrent GNSS chips with TCXO
EVK-M8C u-blox M8 Evaluation Kit with Crystal MAX-M8C; NEO-M8M
u-blox M8 concurrent GNSS chips with Crystal
MAX-8C, u-blox 8 GNSS chips with Crystal
EVK-M8MEVA u-blox M8 Evaluation Kit with EVA-M8M-0 EVA-M8M, EVA-8M
EVK-M8QEVA u-blox M8 Evaluation Kit with EVA-M8Q EVA-M8Q
EVK-8N u-blox 8 Evaluation Kit with TCXO MAX-8Q; NEO-8Q
u-blox 8 GNSS chips with TCXO
Table 1: List of available EVK-7 / EVK-8 / EVK-M8 evaluation kits
☞The EVK may have features not available on the real product. Refer to the product data sheet to
see if a feature is available on the specific product.
☞EVK-M8C and EVK-M8MEVA to be set in single GPS or single GLONASS mode for evaluating
MAX-8C, u-blox 8 chip with crystal or EVA-8M. More information about GNSS configuration, see
section 4.3.11.
1.2 Kit includes
•Evaluation unit
•USB cable
•antenna with 3 m cable
oFor u-blox 7 and 8 EVK: Active GPS / GLONASS antenna
oFor u-blox M8 EVK: Active GPS / Galileo / GLONASS / BeiDou antenna
•Quick Start card
1.3 Software and documentation
The EVK installation software (and documentation) package can be downloaded from the Web; see
the Quick Start card for the URL. Separate installation packages are available for EVK-7, EVK-8 or
EVK-M8.

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1.3.1 u-center GNSS evaluation software
The installation software includes u-center, an interactive tool for configuration, testing,
visualization and data analysis of GNSS receivers. It provides useful assistance during all phases of
a system integration project.
1.4 System requirements
•PC with USB interface
•Operating system: Windows Vista onwards (x86 and x64 versions)
•USB drivers are provided in the evaluation kit installation software

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2Specifications
Parameter Specification
Serial Interfaces 1 USB V2.0
1 RS232, max. baud rate 921,6 kBd
DB9 +/- 12 V level
14 pin – 3.3 V logic
1 DDC (I2C compatible) max. 400 kHz
1 SPI – clock signal max. 5,5 MHz – SPI DATA max. 1 Mbit/s
Timing Interfaces 1 Time pulse output1
Dimensions 105 x 64 x 26 mm
Power Supply 5V via USB or external powered via extra power supply
pin 14 (V5_IN) 13 (GND)
Normal Operating temperature -40°C to +65°C
Table 2: EVK-7 / EVK-8 / EVK-M8 specifications
2.1 Safety precautions
EVK-7 and EVK-M8 must be supplied by an external limited power source in compliance with clause
2.5 of the standard IEC 60950-1. In addition to an external limited power source, only separated or
Safety Extra-Low Voltage (SELV) circuits are to be connected to the evaluation kit, including
interfaces and antennas.
☞For more information about SELV circuits see section 2.2 in Safety standard IEC 60950-1 [26].
1Time pulse not available in all EVK versions. Refer to section 4.3.4 on how to check availability of Time pulse 1 on your EVK.

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3Getting Started
3.1 Software installation
☞Installation of the EVK-7, EVK-8 or EVK-M8 software and documentation requires Internet
access.
Choose Software only or Software and documentation installation package from u-blox website.
Once the zip file is downloaded and unzipped, unzip the file in Tools folder and double-click the
extracted exe file.
The software components will be installed on your system and placed under the “u-blox” folder in the
“Start Programs” menu.
3.2 Hardware installation
1. Connect the unit to a PC running Microsoft Windows. Options:
oUSB: Connect via USB port.
oUART: Connect via RS232. Set slide switch to I2C.
oSPI / I2C compliant DDC: Connect corresponding pins (see Table 5 for pin description). Set
slide switch accordingly to SPI or I2C.
☞Press the RST button after changing the switch.
2. The device must always have power, either via USB on the back or the V5_IN input on the front.
3. Connect the GNSS antenna to the evaluation unit and place the antenna in a location with good
sky view.
4. Start the u-center GNSS Evaluation Software and select corresponding COM port and baud rate.
☞Refer to the u-center User Guide [21] for more information.
3.3 Serial port default configuration
Parameter Description Remark
UART Port 1, Input UBX and NMEA protocol at 9’600 Bd
UART Port 1, Output UBX and NMEA protocol at 9’600 Bd Only NMEA messages are activated
USB, Input UBX and NMEA protocol
USB, Output UBX and NMEA protocol Only NMEA messages are activated
Table 3: Default configuration

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4Device description
4.1 Interface connection and measurement
For connecting the EVK to a PC, use a standard SUBD-9 cable and the included USB cable.
Additional measurement equipment can be connected to the front connector.
Figure 1: Connecting the unit for power supply and communication
4.2 Active antenna
EVK-7 and EVK-8 evaluation kits include a GPS / GLONASS antenna with a 3.0 m cable. It is possible
to connect various active and passive GNSS antennas with SMA connectors to the evaluation unit.
EVK-M8 evaluation kits include a GPS / Galileo / GLONASS / BeiDou antenna with a 3 m cable. It is
possible to connect various active and passive GNSS antennas with SMA connectors to the
evaluation unit.
The recommended maximum antenna supply current for active antennas is 30 mA.
☞The characterization and certifications for EVK-M8MEVA and EVK-M8QEVA are applicable only
with the active GNSS antenna included in the evaluation kit (or comparable),
4.3 Evaluation unit
Figure 2 shows the front and the rear panel of the EVK-7 or EVK-M8 evaluation unit.
Front panel
Rear panel
Figure 2: EVK-7 / EVK-8 / EVK-M8 evaluation unit – front and rear panels

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4.3.1 Antenna connector
An SMA female jack is available on the front side (see Figure 2) of the evaluation unit for connecting
an active or passive antenna. DC voltage at the RF input is 3.3 V. The internal short circuit protection
limits the maximum current to 60 mA. Please note that the 30 mA maximum supply current for
active antenna stays the same. This pin is also ESD protected.
To avoid the damage of RF input caused by ESD or Electrical Overstress, and to seek maximum
consistency and repeatability of performance independently of the RF component used, all EVK-7,
EVK-8 and EVK-M8 have an onboard LNA.
⚠The connector is only to be used with a GNSS antenna or simulator. Do not connect this
equipment to cable distribution systems.
4.3.2 USB
A USB V2.0 compatible serial port is featured for data communication and power supply.
4.3.3 UART
The evaluation unit includes an RS232 port for serial communication that is compatible with PC
serial ports.
Connect using a straight RS232 serial cable with male and female connectors to the port on your PC.
The maximum cable length is < 3.0 meters. To configure the RS232 port, use the CFG-PRT command
in the u-center application. The maximum operating baud rate is 921.6 kBd.
If you are using a USB to RS232 adaptor cable, you can connect it directly to the evaluation kit RS232
port.
The 9-pin D-SUB female connector is assigned as listed in Table 4:
Pin Nr. Assignment
1 not connected
2 TXD, GNSS Transmit Data, serial data to DTE
3 RXD, GNSS Receive Data, serial data from DTE
4 not connected
5 GND
6 not connected
7-9 not connected
Table 4: SUB-D9 Connector pin description for EVK-7 / EVK-8 / EVK-M8
4.3.4 Time Pulse
u-blox receivers include a time pulse function providing clock pulses with a configurable pulse period,
pulse length and polarity (rising or falling edge). Check the product data sheet for detailed
specifications of configurable values.
In the latest EVK-8N and EVK-M8 versions of the evaluation unit, the time pulse signal is connected
to the LED on the front panel of the unit and also to the Test Connector. The “TIMEPULSE” text on
the evaluation unit label indicates this (see Figure 3). In older versions of the evaluation unit, the time
pulse signal is not available in the Test Connector, and the label shows the corresponding pin to be
“RESERVED0”.

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Figure 3: EVK Label
4.3.5 RST button
The RST button on the front panel resets the unit. To avoid an inadvertent reset, the button is
recessed.
4.3.6 Safe boot button
This is used to set the unit in safe boot mode. In this mode the receiver executes only the minimal
functionality, such as updating new firmware into the SQI flash. In order to set the receiver in safe
boot mode please follow these steps.
1. Press the BOOT button and keep holding
2. Press the RST button
3. Release the RST button
4. Release the BOOT button
5. If the UART interface has to be used, the training sequence has to be sent to the receiver.
The training sequence is a transmission of 0x55 55 at the baud rate of 9600 Bd. Wait for at
least 100 milliseconds before the interface is ready to accept commands.
4.3.7 Slide Switch
Use the slide switch on the front panel to choose between I2C (and UART) and SPI communication
ports. You must reset the unit by pressing the RST button when the slide switch has been changed.
1.
I2C – In this selection the EVK operates with the UART (RS232 DB9 – rear panel or the 3.3 V
level TxD (MISO), RxD (MOSI) at the front panel). Also the communication via 3.3 V DDC
interface (I2C) is selected.
2.
SPI – In this selection the EVK operates only with the SPI interface. RS232 (DB9) is switched
off.
4.3.8 Test Connector
This 14-pin test-connector provides additional functionality to the EVK, allowing access to the
interface pins and an ability to measure the current used by the EVK. All pins are ESD protected.
For accurate measurements, it is recommended to use a cable of at most 1 meter in length. Figure
3 shows an example of a power supply connected to the test connector by using standard adapter
cables from the manufacture Hirschmann. Figure 4 shows an example for overall current
measurement. When connecting the 3.3 V digital interfaces RS232, SPI and DDC to your application,
a cable length less than 25 cm is recommended.

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PIN Nr.: PIN NAME I/O LEVEL DESCRIPTION
14 V5_IN I 4.75 V –
5.25 V
Power input – can be used instead of USB
13 GND I - Common ground pin
12 P1A (VCC) O 3.3 V Power output – max. current supply 100 mA
1Ω1% resistor for over-all current measurement to pin 11 (P1B)
NOTE: the current includes also SQI Flash, LNA
11 P1B O Second connection for over-all current measurement (see Figure 5)
10 P2A O 3.0 V Battery output (unloaded)
100 Ω1% resistor for battery backup current measurement to pin 9 (P2B)
NOTE: There is a current protection to 3 mA. See circuit in figure 7 (D2, D4, R29)
9 P2B O Second junction for battery backup current measurement
8 TIMEPULSE1 O 3.3 V Time pulse 1 (internally buffered output)2
7 EXTINT0 I 3.3 V External interrupt input
6 RESERVED1 - - not connected
5 SDA /CS I/O 3.3 V If slide switch on I2C, then DDC interface selected; Function: data input / output
If slide switch on SPI, then SPI interface selected; chip select input – LOW ACTIVE
4 SCL / SCK I/O 3.3 V Clock input / output
3 TxD / MISO I/O 3.3 V If slide switch on I2C, then DDC interface selected / UART TxD (3.3V Level)
If slide switch on SPI, then SPI interface selected; Master in Slave out (MISO)
2 RxD / MOSI I/O 3.3 V If slide switch on I2C, then DDC interface selected / UART RxD (3.3V Level)
If slide switch on SPI, then SPI interface selected; Master out Slave in (MOSI)
1 GND I - Common ground pin
Table 5: Connector pin description for EVK-7 / EVK-8 / EVK-M8 (pins numbered from right to left on the front panel)
2Time pulse not available in all EVK versions. Refer to section 4.3.4 on how to check availability of Time pulse 1 on your EVK.
V5_IN
GND
GND
V5_IN
Hirschmann
Part Nr.: 934160100
Figure
4: Example 5V DC power supply

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4.3.9 LED
On the front panel of the unit, a single blue LED shows the time pulse 1 signal. The LED starts
flashing one pulse per second during a GNSS fix. If there is no GNSS fix, the LED will only light, without
flashing.
4.3.10 Backup Battery
There is a backup battery in the evaluation unit. This is necessary to store orbital information
between operations and to enable faster start-up. It is a RENATA 3.0 V Li / MnO²battery of the type
CR2450. The battery has a rated capacity of 540 mA. The battery operating temperature range is -
40° C to +85° C.
In case the built-in backup battery runs low or empty after a long storage period, purchase the above
described battery for replacement (refer to the section 10 for battery replacement guidelines).
⚠CAUTION! RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE
OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS!
4.3.11 GNSS Configuration
The EVK-7 and EVK-8 supports GPS, QZSS and GLONASS. The EVK-M8N/C and EVK-
M8MEVA/EVK-M8QEVA supports GPS, Galileo, QZSS, GLONASS, and BeiDou.
The GNSS to be used can be configured on u-center (View Messages View then UBX-CFG-GNSS).
For more information, refer to the
u-center User Guide [21], the u-blox 7 Receiver Description
including Protocol Specification
[9] and u-blox 8 / u-blox M8 Receiver Description including Protocol
Specification
[20].
4.3.12 RTC Configuration (EVK-7EVA and EVK-M8MEVA)
The EVK-7EVA and EVK-M8MEVA include the EVA-7M or EVA-M8M GNSS receiver with an external
RTC. By default, the EVA-7M or EVA-M8M module is not running in single crystal mode. The
EVK-7EVA and EVK-M8MEVA evaluation kits can be set to single crystal mode by using the
configuration string described in the EVA-7M Hardware Integration Manual [8] and the EVA-8M /
EVA-M8M Hardware
Integration Manual [18].
☞Applying the configuration string results in a permanent change and cannot be reversed. The
current consumption is significantly higher in single crystal mode. For more information see the
EVA-7M Data Sheet [5], EVA-8M Data Sheet [25] and the EVA-M8 Data Sheet [13].

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5Measuring tracking current
To measure the tracking current with EVK-7 / EVK-8 / EVK-M8, follow these steps:
1. Connect a true RMS voltmeter across P1A (VCC) and P1B of the front connector. (see Figure 5)
2. Wait 12 minutes to download all GNSS orbital data, or download all the Aiding Data via the
AssistNow Online service
3. Read the voltage (and average if necessary) on the voltmeter and convert to current (1 mV equals
1 mA)
4. Perform the test with good signals and clear sky view to ensure that the receiver can acquire the
satellite signals.
☞The overall current measurement also includes the internal SQI flash. For ROM based products
the current will be lower.
For more details see the circuit in Figure 9.
Hirschmann
Part Nr.: 934160100
P1A
(VCC)
P1B
P1B
P1A
(VCC)
Figure
5: Example – tracking current measurement

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6Board layout
6.1 PCB Version C
Figure 7 shows the EVK-7 layout (PCB Version C). See Table 6 for the component list of the EVB.
Figure
6: EVB-7 layout

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PART DESCRIPTION
A1 GNSS RECEIVER -40/+85C
BT1 BATTERY HOLDER RENATA CR2450N 3V
C1 C11 C13 C22 CAP CER X5R 0603 1U0 10% 6.3V
C10 C14 C16 C19 C2 C6 C7 C8 CAP CER X7R 0603 100N 10% 10V
C12 C9 CAP CER X7R 0603 10N 10% 25V
C20 CAP CER COG 0402 1P8 +/-0.1P 25V
C21 CAP CER COG 0402 22P 5% 25V
C23 CAP CER COG 0402 47P 5% 25V
C24 CAP CER X5R 0402 100N 10% 10V
C25 C3 CAP CER X5R 1210 10U 10% 10V
C5 CAP CER X7R 0402 1N0 10% 16V
D1 D2 D4 D5 SURFACE MOUNT SCHOTTKY BARRIER RECTIFIER SS14 1A -55/+125C
D3 R17 R18 R20 R21 R22 R23 ESD PROTECTION FOR HIGH SPEED LINES, TYCO, 0.25PF, PESD0402-140 -55/+125C
DS1 LED OSRAM HYPER MINI TOPLED LB M673-L1N2-35 BLUE 0.02A
FB1 FERRITE BEAD MURATA BLM15HD 0402 1000R@100MHZ
J1 CON USB RECEPTACLE MICRO B TYPE SMD – MOLEX 47346-0001 – TID60001597 30V
1A
J2 CON SMA SMD STRAIGHT JACK 11.4MM HEIGHT WITHOUT WASHER AND NUT
J3 9 POLE SUBD CONNECTOR FEMALE
J4 14PIN 90° 2.54MM PITCH DISCONNECTABLE CRIMP CONNECTOR -40/+85C
L1 IND MURATA LQW15A 0402 8N7 3% 0.54A -55/+125C
L2 IND MURATA LQW15A 0402 120N 5% 0.64A -55/+125C
Q1 MBT3906DW1T1G DUAL GENERAL PURPOSE TRANSISTOR 0.2A 0.15W -40/+125C
R1 RES THICK FILM CHIP 1206 10R 5% 0.25W
R10 RES THICK FILM CHIP 0402 220R 5% 0.1W
R11 R2 R6 RES THICK FILM CHIP 0603 100R 5% 0.1W
R12 RES THICK FILM CHIP 0402 2K2 5% 0.1W
R13 R24 R27 RES THICK FILM CHIP 0603 100K 5% 0.1W
R14 R15 R19 R3 R8 VARISTOR BOURNS MLE SERIES CG0402MLE-18G 18V
R29 RES THICK FILM CHIP 0603 1K0 5% 0.1W
R4 R5 RES THICK FILM CHIP 0603 22R 5% 0.1W -55/+125C
R7 RES THICK FILM CHIP 0603 1R0 5% 0.1W
S1 S2 SWITCH SPST ON 1POL TYCO -40/+85C
S3 2 WAY SUB-MINIATURE SLIDE SWITCH SMD JS SERIES – SPDT -40/+85C
U1 USB DATA LINE PROTECTION ST USBLC6-2SC6 SOT23-6
U2 U4 LOW DROPOUT REGULATOR LINEAR LT1962 MS8 3.3V 0.3A
U3 U9 TINY LOGIC UHS BUFFER OE_N ACTIVE LOW FAIRCHILD NC7SZ125 SC70
U5 LOW NOISE AMPLIFIER GAAS MMIC 1.575 GHZ 1.5V-3.6V JRC EPFFP6-A2 3.6V -
40/+85C
U6 RS-232 TRANSCEIVER 1MBIT 3-5,5VOLT TRSF3223 – VQFN20 5.5V -40/+85C
U7 TINY LOGIC ULP-A 2-INPUT AND GATE 1.45X1.0 6-LEAD MICROPAK -40/+85C
Table 6: EVB-7 component list

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6.2 PCB Version D
Figure 8 shows the EVK-8 / EVK-M8 board layout (PCB Version D). See Table 7 for the component
list of the EVB.
Figure 7: EVB-8 / EVB-M8 layout

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PART
DESCRIPTION
A1 GNSS RECEIVER -40/+85C
BT1 BATTERY HOLDER RENATA CR2450N 3V
C1 C11 C13 C22
CAP CER X5R 0603 1U0 10% 6.3V
C2 C6 C7 C8 C10 C14 C16 C19
CAP CER X7R 0603 100N 10% 10V
C3 C25
CAP CER X5R 1210 10U 10% 10V
C5 CAP CER X7R 0402 1N0 10% 16V
C9 C12 CAP CER X7R 0603 10N 10% 25V
C20
CAP CER COG 0402 1P8 +/-0.1P 25V
C21
CAP CER COG 0402 22P 5% 25V
C23
CAP CER COG 0402 47P 5% 25V
C24 CAP CER X5R 0402 100N 10% 10V
D1 D2 D4 D5 SURFACE MOUNT SCHOTTKY BARRIER RECTIFIER SS14 1A -55/+125C
D3 R17 R18 R20 R21 R22 R23 ESD PROTECTION FOR HIGH SPEED LINES, TYCO, 0.25PF, PESD0402-140 -55/+125C
DS1
LED OSRAM HYPER MINI TOPLED LB M673-L1N2-35 BLUE 0.02A
FB1
FERRITE BEAD MURATA BLM15HD 0402 1000R@100MHZ
J1 CON USB RECEPTACLE MICRO B TYPE SMD - MOLEX 47346-0001 - TID60001597 30V
1A
J2
CON SMA SMD STRAIGHT JACK 11.4MM HEIGHT WITHOUT WASHER AND NUT
J3
9 POLE SUBD CONNECTOR FEMALE
J4 14PIN 90\xB0 2.54MM PITCH DISCONNECTABLE CRIMP CONNECTOR -40/+85C
L1 IND MURATA LQW15A 0402 8N7 3% 0.54A -55/+125C
L2 IND MURATA LQW15A 0402 120N 5% 0.64A -55/+125C
Q1
MBT3906DW1T1G DUAL GENERAL PURPOSE TRANSISTOR 0.2A 0.15W -40/+125C
R1
RES THICK FILM CHIP 1206 10R 5% 0.25W
R2 R6 R11
RES THICK FILM CHIP 0603 100R 5% 0.1W
R3 R8 R14 R15 R19 VARISTOR BOURNS MLE SERIES CG0402MLE-18G 18V
R4 R5 RES THICK FILM CHIP 0603 22R 5% 0.1W -55/+125C
R7
RES THICK FILM CHIP 0603 1R0 5% 0.1W
R9
RES THICK FILM CHIP 0603 51R 1% 0.063W (was DNI, but is now installed by default) 3
R10
RES THICK FILM CHIP 0402 220R 5% 0.1W
R12 RES THICK FILM CHIP 0402 2K2 5% 0.1W
R13 R24 R27 RES THICK FILM CHIP 0603 100K 5% 0.1W
R29 RES THICK FILM CHIP 0603 1K0 5% 0.1W
R43 R44 R46 R47 R48 R49 R50
RES THICK FILM CHIP 0402 0R 0 0.1W
S1 S2
SWITCH SPST ON 1POL TYCO -40/+85C
S3 2 WAY SUB-MINIATURE SLIDE SWITCH SMD JS SERIES - SPDT -40/+85C
U1 USB DATA LINE PROTECTION ST USBLC6-2SC6 SOT23-6
U2 U4 LOW DROPOUT REGULATOR LINEAR LT1962 MS8 3.3V 0.3A
U3 U9
TINY LOGIC UHS BUFFER OE_N ACTIVE LOW FAIRCHILD NC7SZ125 SC70
U5 LOW NOISE AMPLIFIER GAAS MMIC 1.575 GHZ 1.5V-3.6V JRC EPFFP6-A2 3.6V -
40/+85C
U6 RS-232 TRANSCEIVER 1MBIT 3-5,5VOLT TRSF3223 - VQFN20 5.5V 5.5V -40/+85C
U7
TINY LOGIC ULP-A 2-INPUT AND GATE 1.45X1.0 6-LEAD MICROPAK -40/+85C
Table 7: EVB-8 / EVB-M8 component list
3Time pulse not available in all EVK versions. Refer to section 4.3.4 on how to check availability of Time pulse 1 on your EVK.

EVK-7 / EVK-8 / EVK-M8 User Guide
UBX-14002502 - R10 Early Production Information Schematic
Page 18 of 25
7Schematic
Figure 8: Schematic EVK-7 / EVK-8 / EVK-M8: DNI=TRUE in the schematic means: Component not installed

EVK-7 / EVK-8 / EVK-M8 User Guide
UBX-14002502 - R10 Early Production Information Battery replacement
Page 19 of 25
8Battery replacement
To replace the battery (Number 5 in Figure 10), open the unit (unscrew four screws on the front panel).
Figure 9: EVK-7 / EVK-8 / EVK-M8 battery location

EVK-7 / EVK-8 / EVK-M8 User Guide
UBX-14002502 - R10 Contents Page 20 of 25
Early Production Information
9Troubleshooting
My application (e.g. u-center) does not receive anything
Check whether the blue LED on the evaluation unit is blinking. Also make sure that the USB cable is
properly connected to the evaluation unit and the PC. By default, the evaluation unit outputs NMEA
protocol on Serial Port 1 at 9600 Bd, or on the USB.
My application (e.g. u-center) does not receive all messages
When using UART, make sure the baud rate is sufficient. If the baud rate is insufficient, GNSS
receivers based on u-blox 7 and u-blox M8 GNSS technology
will skip excessive messages. Some serial
port cards/adapters (i.e. USB to RS232 converter) frequently generate errors. If a communication
error occurs while u-center receives a message, the message will be discarded.
My application (e.g. u-center) loses the connection to the GNSS receiver
u-blox 7 / u-blox 8 / u-blox M8 positioning technology and u-center have an autobauding feature. If
frequent communication errors occur (e.g. due to problems with the serial port), the connection may
be lost. This happens because u-center and the GNSS receiver both autonomously try to adjust the
baud rate. Do not enable the u-center autobauding feature if the GNSS receiver has the autobauding
flag enabled.
The COM port does not send any messages
Be sure that the slide switch at the front panel is set to I2C and not SPI. In SPI Mode the RS232 pins
on the DB9 connector are switched off and the RxD and TxD output at the front panel are used for SPI
(MISO, MOSI).
NOTE: After changing the slide switch, always reset the EVK, otherwise the change will not take place.
Some COM ports are not shown in the port list of my application (e.g. u-center)
Only the COM ports that are available on your computer will show up in the COM port drop down list.
If a COM Port is gray, another application running on this computer is using it.
The position is off by a few dozen meters
u-blox 7 / u-blox 8 / u-blox M8 GNSS technology starts up with the WGS84 standard GNSS datum. If
your application expects a different datum, you’ll most likely find the positions to be off by a few dozen
meters. Don’t forget to check the calibration of u-center map files.
The position is off by hundreds of meters
Position drift may also occur when almanac navigation is enabled. The satellite orbit information
retrieved from an almanac is much less accurate than the information retrieved from the ephemeris.
With an almanac only solution, the position will only have an accuracy of a few kilometers but it may
start up faster or still navigate in areas with obscured visibility when the ephemeris from one or
several satellites have not yet been received. The almanac information is NOT used for calculating a
position, if valid ephemeris information is present, regardless of the setting of this flag.
In NMEA protocol, position solutions with high deviation (e.g. due to enabling almanac navigation) can
be filtered with the Position Accuracy Mask. UBX protocol does not directly support this since it
provides a position accuracy estimation, which allows the user to filter the position according to his
requirements. However, the ‘Position within Limits’ flag of the UBX-NAV-STATUS message indicates
whether the configured thresholds (i.e. P Accuracy Mask and PDOP) are exceeded.