Ublox IRIS-W10 Series User manual

UBX-23007837 - R03
C1-Public www.u-blox.com
EVK-IRIS-W10
Evaluation kit for IRIS-W10 series modules
User guide

Abstract
This document describes how to set up and use the EVK-IRIS-W10 evaluation kits
for prototyping
the IRIS-W10 open CPU, multiradio modules. It also describes the different options for
debugging
and the development capabilities included in the evaluation board.

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Document information
Title EVK-IRIS-W10
Subtitle Evaluation kit for IRIS-W10 series modules
Document type User guide
Document number UBX-23007837
Revision and date R03 9-Jan-2024
Disclosure restriction C1-Public
This document applies to the following products:
Product name
EVK-IRIS-W101
EVK-IRIS-W106
u
-blox or third parties may hold intellectual property rights in the products, names, logos, and designs included in this
document.
Copying, reproduction, or modification of this document or any part thereof is only permitted with the express
written permission of u
-blox. Disclosure to third parties is permitted for clearly public documents only.
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
Document information................................................................................................................................2
Contents ..........................................................................................................................................................3
1Product description ..............................................................................................................................5
1.1 Overview........................................................................................................................................................ 5
1.2 Kit includes ................................................................................................................................................... 5
1.2.1 EVK-IRIS-W101...................................................................................................................................5
1.2.2 EVK-IRIS-W106...................................................................................................................................5
1.3 Key features .................................................................................................................................................5
1.4 Block diagram .............................................................................................................................................. 6
2Setting up the evaluation board.......................................................................................................7
2.1 Starting up the EVB.................................................................................................................................... 7
2.1.1 Flash tool installation ........................................................................................................................7
2.1.2 Wi-Fi example application.................................................................................................................8
2.2 Software Development ............................................................................................................................10
2.2.1 NXP SDK .............................................................................................................................................10
3Hardware description........................................................................................................................ 11
3.1 Power ...........................................................................................................................................................11
3.1.1 Powering the board ..........................................................................................................................12
3.1.2 IRIS-W10 module power ..................................................................................................................14
3.1.3 Current measurement .....................................................................................................................15
3.2 Reset............................................................................................................................................................15
3.2.1 Automatic bootloader / Bootstrap ................................................................................................16
3.3 Buttons........................................................................................................................................................17
3.4 User LEDs ...................................................................................................................................................17
3.5 Serial communication ..............................................................................................................................19
3.5.1 MCU-Link............................................................................................................................................19
3.5.2 USB-to-UART FTDI...........................................................................................................................21
3.6 JTAG/SWD debug interfaces .................................................................................................................22
3.7 32.768 kHz low frequency clock.............................................................................................................24
3.8 mikroBUS slots ..........................................................................................................................................25
3.8.1 mikroBUS 1 slot ................................................................................................................................26
3.8.2 mikroBUS 2 slot ................................................................................................................................27
3.8.3 mikroBUS 3 slot ................................................................................................................................28
3.8.4 mikroBUS 4 slot ................................................................................................................................29
3.9 RMII ..............................................................................................................................................................30
3.9.1 RMII Strap-in options .......................................................................................................................31
3.10 SDIO 3 ..........................................................................................................................................................32
3.11 Pin headers.................................................................................................................................................34
3.12 QSPI memory .............................................................................................................................................37

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3.13 Jumpers......................................................................................................................................................37
3.14 Test points .................................................................................................................................................40
Appendix ...................................................................................................................................................... 41
AGlossary ................................................................................................................................................. 41
Related documentation ........................................................................................................................... 42
Revision history.......................................................................................................................................... 43
Contact.......................................................................................................................................................... 43

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1Product description
1.1 Overview
The EVK-IRIS-W10 evaluation kit enables stand-alone use of the IRIS-W10 series module. This
guide provides details about the hardware functionality of the EVK-IRIS-W10 board and
includes setup instructions for starting development.
All pins and interfaces supported on IRIS-W10 series modules are easily accessible from the
evaluation board. Simple USB connections serve as the physical interfaces for the power,
programming COM ports, debugging, and USB peripheral connectors. Additionally, the board
features other interfaces like Ethernet RJ45 and an SDIO header. The EVK-IRIS-W10 board is
equipped with a Reset button, Boot button, and two user-configurable buttons. Current sense
resistors are incorporated for accurate current measurement within the module.
For flexible use, GPIO signals are accessible through headers and are complemented by four
mikroBUS™ standard slots for convenient utilization of Click boards™. Each Click board can be
seamlessly plugged into an available mikroBUS™ slot to facilitate effortless hardware
expansion with a variety of standardized compact add-on boards. Click boards are designed to
accommodate a diverse range of electronic modules, including sensors, transceivers, displays,
encoders, motor drivers, connection ports, and more. For further information about the Click
boards, visit the MIKROE website [9].
1.2 Kit includes
1.2.1 EVK-IRIS-W101
•EVK-IRIS-W1 evaluation board with IRIS-W101module
•USB-A to USB-C adapter cable
•Dual band PCB antenna for WLAN with 100 mm coaxial cable and U. FL connector
1.2.2 EVK-IRIS-W106
•EVK-IRIS-W1 evaluation board with IRIS-W106 module
•USB-A to USB-C adapter cable
•A dual-band integrated PCB trace antenna (external antenna not supplied)
1.3 Key features
EVK-IRIS-W10 boards provide:
•Evaluation board for IRIS-W101 or IRIS-W106 modules
•Four standard mikroBUS slots
•USB interface
•Serial communication over the FTDI USB controller
•On-board programming and debug
oMCU-Link port via debug chip over the SWD interface
oJTAG debugging via a four-port FTDI USB controller
•RMII/Ethernet interface (via 100 Mbit PHY circuit)
•Access to IRIS-W10 module JTAG signals over JTAG connector
•Buttons and status LEDs for user interaction
•All module GPIOs accessible from the pin headers
•Additional memory support (SRAM SOIC-08 footprint on the bottom side for manual
mounting)
•Multiple Boot strap options
•Module isolation and customizable functions via solder bridges and/or resistors
•Current measurement access points from pin headers and jumpers
•SDIO 3 card slot

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IRIS-W10 open CPU modules, based on the NXP RW612, support:
•Wi-Fi 6 IEEE 802.11a/b/g/n/ac/ax, Dual band WiFi 2.4/5 GHz
•IEEE 802.15.4 supporting Thread®, Matter™ over Wi-Fi, and Ethernet
•Bluetooth LE subsystem supporting Bluetooth 5.3 in 2.4 GHz band
•Bluetooth LE central, peripheral, GATT client / server roles, LE Audio
•Peripherals1: ADC, GPIO, I2C, Ethernet RMII, SDIO, SPI, UART
1.4 Block diagram
Figure 1 shows the block diagram and internal connections of EVK-IRIS-W10.
Figure 1: EVK-IRIS-W10 block diagram
1Not all peripherals available simultaneously

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2Setting up the evaluation board
Connect the external power supply to the EVK as described in powering the board section.
•The green status LED (D10) is lit when the internal EVK 3V3supply is active.
•The green status LED (D19) is lit when 3V3 supply to the MCU Link chip is active.
⚠Approvals for IRIS-W1 are currently pending. For further information about the current
approval status, see the Qualifications and approvals section in the data sheet [1] .
⚠Observe that this device is for evaluation only and is not FCC approved for resale.
The operating system installs the correct COM port drivers automatically. The drivers need to
be installed only when you connect the unit to a new computer for the first time. For more
information about the COM ports and their configuration, see the FTDI FT231XQ-R Datasheet
[7] or LPC55S69JBD100K Datasheet [8].
Windows OS automatically assigns one COM port to the unit. To view the assigned COM ports
on Windows 10:
1. Open the Control Panel and select Hardware and Sound.
2. Click Device Manager in Devices and Printers. This opens the Device Manager window
where you can view the assigned COM ports.
IRIS-W10 open CPU module variants are used to develop custom software based on the NXP
MCUXpresso SDK, which provides all the APIs required for custom application development.
Before compiling custom software, you must configure the NXP MCUXpresso SDK for use with
the IRIS-W10 open CPU variant. For information about for the working environment setup and
regulatory restrictions, see the respective “Open CPU software” and “Qualification and
approvals” sections of the IRIS-W10 system integration guide [2].
2.1 Starting up the EVB
⚠Before powering up the EVK-IRIS-W101, be sure to connect an antenna (or any 50 Ω RF
load) to the U.FL antenna connector (J41). Failing to do so can cause module malfunction.
2.1.1 Flash tool installation
To get the EVK ready with necessary flash tools and settings:
1. Attach the USB-C cable to the USB3 MCU-Link port on the EVB and connect to PC to
power the module.
2. Set SW3 to default configuration, as described in Automatic bootloader / strap-in
3. Download and install the latest version of the J-Link software (V7.92g onwards) from
SEGGER [5]
4. Go to the NXP website [3]. Download and install the latest MCU-Link software on the PC.
5. Flash the J-Link software on the LPC chip (MCU-Link chip)
[MCU-LINK_INSTALLER_WIN_3.1xx] by running the script:
"NXP\MCU-LINK_installer_3.1xx\scripts\program_JLINK.cmd".
After the successful flashing of J-Link firmware:
LED1 turns red and blinks slowly.
Enumerated COM port "JLink CDC UART Port (COMxx)" is shown in Device Manager.
This process is necessary only during the initial setup of a newly acquired EVK.
6. Power cycle the module/EVK after flashing the software onto the LPC chip.
7. Pull the RFC2 pin to low on the SW8 to enable the SWD interface of the module.

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8. Replace the “flash_config.c” in the SDK\boards\rdrw612bga\flash_config folder with the
updated version, which includes an updated FCB (Flash configuration block) and supports
low-density Macronix 8MB QSPI Flash. The updated flash_config.c file is available in the
u-blox short range open CPU GitHub repository [6].
2.1.2 Wi-Fi example application
The wifi_cli application is provided in binary format and can be used to quickly demonstrated
Wi-Fi features without the need of installing SDK or compiling any firmware.
Example of supported features:
•Wi-Fi Scan
oWi-Fi Soft AP mode
oWi-Fi Station mode
•Throughput performance using iPerf measurement tool
2.1.2.1 Flash the wifi_cli example firmware
IRIS-W10 module stores the RW612 application and Wi-Fi firmware binary in different
partitions of internal FlexSPI NOR flash. The application reads Wi-Fi firmware during
initialization and downloads it to RW612 internal Wi-Fi MCU to run.
1. Open J-Flash Lite or JLinkCommander and connect RW612 device using SWD interface
at 4000 kHz speed.
Figure 2: J-Flash Lite device config
2. Download Wi-Fi firmware rw610_sb_wifi_v1.bin and wifi_cli application
rw612_wifi_cli.hex from the u-blox short range open CPU GitHub repository [6].
3. Flash Wi-Fi firmware rw610_sb_wifi_v1.bin at the address 0x08400000.
Figure 3: Flashing Wi-Fi firmware
☞Wi-Fi firmware must be flashed once unless it is erased. It must be flashed to the address
shown in Figure 3. Ensure that the Wi-Fi firmware is flashed before running any Wi-Fi
application.

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4. Flash the wifi_cli application file rw612_wifi_cli.hex.
Figure 4: Flashing wifi_Cli application
5. Reset the module and open a UART console (using Putty, TeraTerm, or another terminal
emulator), and set the serial port to 115200 baud rate and run different feature sets in
the wifi_cli application.
Figure 5: wifi_cli demo
2.1.2.2 Run iperf test using the wifi_cli example
This section assumes that the iperf test is run using two EVK-IRIS-W10 – with Device A
configured as an Access Point and Device B configured as a Station. However, iperf
measurements can also be run against other devices that support iperf.
Configure device A as Access Point with iperf server
To configure device A as an access point with iperf server, open a terminal session and enter:
wlan-add xyz ssid NXPAP ip:192.168.10.1,192.168.10.1,255.255.255.0 role uap channel
48 wpa2 12345678
wlan-start-network xyz
iperf -s

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⚠The device can only operate as an Access Point (AP) on channel 1 – 11 in the 2.4 GHz band
and on channels 36, 40, 44, and 48 in the 5 GHz band.
Configure device B as Station with iperf client
To configure device B as a Station with iperf server, open a terminal session and enter:
wlan-add test1 ssid NXPAP ip:192.168.10.3,192.168.10.1,255.255.255.0 channel 48
wpa2 12345678
wlan-connect test1
iperf -c 192.168.10.1
2.2 Software Development
2.2.1 NXP SDK
To use the EVK-IRIS-W10 together with NXP SDK:
•Create your own board file
•Adapt the examples in the NXP SDK to use this board file
For more information about how to retrieve the SDK and perform these tasks, see the
“Software” section of the IRIS-W10 system integration manual [2]. See also the u-blox short
range open CPU GitHub repository [6].

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3Hardware description
☞Design files for the EVK-IRIS-W10 PCB are available from your local u-blox support team.
Figure 6 shows the major functions provided by EVK-IRIS-W10.
Figure 6: Header and major function locations
3.1 Power
EVK-IRIS-W10 has four potential power sources:
Source Component /
pin
Input range Remarks
USB-C (IRIS-W10) J72 5.0 VDC nominal Power provided by USB peripheral on the IRIS-W10 (USB 1)
USB-C (debug/UART) J98 5.0 VDC nominal Power provided by debug interface (USB 2)
USB-C (MCU-LINK) J101 5.0 VDC nominal Power provided by MCU-LINK (USB 3)
Power header J42, pin 1 5.0 VDC nominal
(3.0 – 6.0 VDC)
2.54 mm pitch pin header
Table 1: EVK-IRIS-W1 power sources
The power sources are protected from reverse polarity by protection diodes, allowing multiple
sources to be present simultaneously.
Only if the power protection circuits are left intact can the USB be safely connected at the
same time as external power. This makes the programming of the module easier.
⚠The EVK USB type C connectors are only capable of handling 5 V input. Do not connect the
12 V supply.

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3.1.1 Powering the board
After applying power to one of the sources described in Table 1, slide SW6 shown in Figure 6
to the ON position to power-on the EVK.
The input voltage VBUS-OUT is extended to:
•3.3 V switching regulator input (U11)
•3.3 V linear regulator input (U20)
•USB 2.0 On-The-Go (OTG) circuit
•VBUS-OUT (5 V) connections on pin headers
•mikroBUS slots 5 V positions
There are two options for the maximum current for the EVK, either:
•Populate the 2.4 A power switch U6 (MP5075GTF) and disconnect R124,as shown in
Figure 7.
•Limit the maximum current to 600 mA by populating R124 with a 1206 0R 2A resistor and
disconnecting U6.
Figure 7: EVK-IRIS-W10 maximum current options
3.1.1.1 3.3 V switching regulator (U11)
The EVB is populated with a fixed 3.3 V, 3 A switching regulator (TPS62132RGTR), as shown
in Figure 8. LED D10 (green) indicates the presence of the 3.3 V output from the regulator U11.
Figure 8: Switching regulator (U11)

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3.1.1.2 3.3 V Linear regulator (U20)
In Figure 9,U20 (NCP692MN33T2G is intended to supply power to the MCU-LINK chip with
minimum interference to the IRIS-W10 radio module.
Figure 9: 3.3V linear regulator (U20)
Resistors R151, R144, and R288 must be populated with 0603 0R,and, in this case, R208,
R145, R274,and R287 must be disconnected. LED D19 (green) indicates the presence of the
3.3 V output from U20.
The voltage dividers (R145/R287) and (R151, R208) provide the EVB with greater flexibility. If
necessary, the EVB can then work with variable output voltage LDOs.
R288, and R211 provide an option to supply the MCU-LINK chip from U11 output voltage.
3.1.1.3 USB 2.0 On-The-Go (OTG)
The OTG function is only supported on the module USB-OTG power switch (U12), as shown in
Figure 10. It is set to the OTG-device by default. Connect jumper J14 to allow IRIS-W10 sense
the presence of the MUSB-OTG-VBUS.
Figure 10: USB On-The-GO switch
Note that:
•Use the 2.4 A maximum current option as mentioned in section Powering the board.
•Populate R121, and R122 with 1206 0R resistors.
•Check the status of resistors, R106, R107, R108, R109, required mode connection.
•LED D20 (Green) indicates the activation of the OTG function.
Maximum current capacity of the USB-OTG is 500 mA. LED D2 (Red) indicates if the current
to OTG-USB exceeds the current rating (800 mA).

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In this mode, the status of the USB-ID signal defines whether the EVB or IRIS-W10 module
works as either an OTG host (supply the voltage to a device board), or an OTG device. USB-ID
is connected to the ground or left floating, as shown in Figure 11.
Figure 11: J72 schematic
3.1.1.4 VBUS-OUT (5V) connection on pin headers
VBUS-OUT (5 V) connections on the J3, J4, J10, and J70 pin headers should only be used for
reference or verification. Otherwise, they can only supply a combined 500mA current and
should not be utilized in conjunction with USB-OTG Host mode.
3.1.1.5 mikroBUS slots 5 V positions
Intended for mikroBUS standard 5 V pins.
3.1.2 IRIS-W10 module power
+3V3 is supplied to IRIS-W10 through VDD-IO (J96) and VDD (J97), with resistors R62 and
R35 intended for current measurement, as shown in Figure 12 and Figure 13.
VDD-IO can be supplied from the +1V8 or +VPA module outputs through jumpers J115 and
J116 (bottom side of the EVB). R126 is needed for the current consumption sensing process.
Jumpers J96, J115, and J116 should not be connected simultaneously.
Figure 12: VDD-IO current jumpers
Figure 13: VDD current jumper
+3V3 VDD
J97 0R
0603
R35

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3.1.3 Current measurement
The evaluation board provides two current-sensing headers, as shown in Figure 14.
•J7 for current measurement of the VDD module supply
•J67 for current measurement of the VDD-IO module supply
Figure 14: VDD and VDD-IO current sensing configuration
Two consecutive pins on Each 2.54 mm pitch 3-pin headers are connected across a 0R, which
can be replaced by a current-sense resistor (> 1R0 is recommended), J97,and J96
respectively, as shown in Figure 12 and Figure 13.The third pin on J7 and J67 are connected
to GND. The VDD and VDD-IO module supplies are sourced through the resistors shown in
Figure 12 and Figure 13. To measure current consumption, use a multimeter or other precise
voltage measurement device and measure the voltage drop across pins 2 and 3. If the current
sensor is removed from the circuit, current can also be measured directly by opening J97 or
J96. Use an ammeter in series with the two voltage pins.
If VDD-IO is supplied by +1V8 or +VPA, R126 can be replaced by a current-sense resistor.
⚠Pin 1 of J7 and J67 is connected to GND.
To bypass the current sense resistors, R35 and R62, solder the respective jumpers J94 and
J95.
The default hardware configuration doesn’t require any modification of the current-sense
headers for the EVK-IRIS-W10 to perform properly.
3.2 Reset
The active-low reset signal, RESETn, is connected to the module PDnpin, the FTDI reset pin,
the four mikroBUS slots, and a momentary button switch (SW5),as shown in Figure 15.
Some Click boards need different RESET signals, and mikroBUS slots have extra independent
configurable RESETn/RESET options through GPIO50. See also mikroBUS slots.
Figure 15: EVK schematic, RESETn button
+3V3 VDD
Module Current Measurement
+3V3
Module IO Current Measurement
1 2 3
J67
1 2 3
J7
VDD-IO
J95
J94

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3.2.1 Automatic bootloader / Bootstrap
Figure 16 shows bootloader configuration and sources available to user. Several signals and
DIP switch combinations used to configure the EVK so it can boot in several scenarios.
Figure 16: Bootloader schematic
EVK has two main methods to bootstrap IRIS-W10 module:
1. Default method - Using DIP switch SW3 with resistors R82, R94, R99 and R103
oFour active-high signals (EXT-FREQ, EXT-PRI, EXT-GNT, EXT-REQ) are used to select
boot source. They correspond to CON3, CON2, CON1 and CON0 respectively in the
table shown in Figure 16.
oFor example, to select ISP as boot source, GND the signal EXT-REQ on SW3.
Alternatively, other configurations are possible as described in the table data shown in
Figure 16.
2. Alternate method – Combination of button SW7, R216, R218, R212, R213, R214, and
R215 as shown in Table 2.
BOOT button Installed resistor Boot source
SW7 R216 Serial
R218 ISP
R216, R218 SDIO
-
R212 USB
R212, R213 SDIO
R212, R215 SPI EEPROM
R214 Serial
R215 ISP
Table 2: Boot/strap-in configuration
☞By holding EXT-REQ signal to GND, blhost.exe can be used to program firmware in ISP
mode. With this firmware, it is possible to perform full flash recovery if IRIS-W10 module
ended in a faulty state while flashing or running an application. See also the blhost user
guide [11].

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3.3 Buttons
In addition to the RESET and BOOT buttons, EVK-IRIS-W1 has two more momentary push-
button switches. These switches are active-low or high and connect to ground or +3V3when
pressed. The buttons and the associated GPIO signals are shown in Figure 17 and Table 3.
Figure 17: EVK schematic - user buttons
Table 3 describes the various user buttons and their relationship with the corresponding GPIO
signals.
Button function Reference designator GPIO Function
SW_1 SW1 GPIO45 No predefined function (software controlled)
SW_2 SW2 GPIO51 No predefined function (software controlled)
BOOT SW7 EXT-GNT
EXT-REQ
Pressing SW7 when R216 or R218 are installed starts the
bootloader in ISP or Serial mode respectively. See also
Automatic bootloader / Bootstrap.
RESET SW5 PDn Resets the module, FTDI chip, and mikroBUS slots
Table 3: User button definitions
3.4 User LEDs
EVK-IRIS-W10 supports 16 LEDs:
•Power status (D10): Indicates 3V3 on the board when lit (green) dependent on SW6
•MCU-LINK Power status (D19): Indicates 3V3 on MCU-LINK when lit (green), dependent on
SW6.
•OTG (D20): Indicates OTG circuit is enabled lit (green).
•OTG-Fault (D2): Indicates over current of the OTG circuit when lit (red).
•MCU-LINK (LED1 - LED5): Indicate MCU-LINK connection status. See also MCU-LINK.
•UART3 status (D4–D9): Indicate UART3 signal status under GPIO control, as shown in
Figure 19.
•System status (RGB1): Powered by +3V3 and turned on by pulling the associated GPIO low.
Associated GPIOs can be used as ADCs after disconnecting each LED by removing
resistors R77–R79, as shown in Table 4 and Figure 18.
RGB LED Associated GPIO Disable option
Red (pin1) GPIO44 Remove R77 to disconnect
Green (pin2) GPIO43 Remove R78 to disconnect
Blue (pin3) GPIO42 Remove R79 to disconnect
Table 4: RGB LED-associated signals

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Figure 18: Schematic – RGB and power LED
Figure 19: Schematic – UART3 status LED
Table 5 describes each of the UART3 LEDs and their relationship with GPIO, and serial UART3
signals. Disconnect each LED from the GPIO by disconnecting U3, U4, and U7.
LED Color GPIO Comments
D4 Green GPIO26/UART3-TxD UART3-TxD activity indicator
D5 Green GPIO24/UART3-RxD UART3-RxD activity indicator
D6 Green GPIO19/UART3-RTS UART3-RTS activity indicator
D7 Green GPIO20/UART3-CTS UART3-CTS activity indicator
D8 Green GPIO11/UART3-DTR UART3-DTR activity indicator
D9 Green GPIO12/UART3-DSR UART3-DSR activity indicator
Table 5: UART3 LEDs and associated signals
B
3
4
G
2
R
1
R GB1
GREEN
D10
360R
0402
R79
750R
0402
R77
470R
0402
R78
470R
0402
R80
+3V3
GPIO42_UCX-RGB-B
GPIO43-UCX-RGB-G
GPIO44-UCX-RGB-R
G ND
2
1A
11Y 6
VCC 5
2Y 4
2A
3
SN 7 4 LVC2G34DCKR
U4
G ND
2
1A
11Y 6
VCC 5
2Y 4
2A
3
SN 7 4 LVC2G34DCKR
U7
D6
470R
0402
R74
D7
470R
0402
R75
D4
470R
0402
R76
D5
470R
0402
R93
G ND
2
1A
11Y 6
VCC 5
2Y 4
2A
3
SN 7 4 LVC2G34DCKR
U3
D8
470R
0402
R72
D9
470R
0402
R73
+3V3
UART status LED
TxD
RxD
RTS
CTS
DTR
DSR
GPIO11_U3-DTR
GPIO12_U3-DSR
GPIO19_U3-RTS
G PI O24
G PI O26
GPIO20_U3-CTS-CS
G PI O24
G PI O26

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3.5 Serial communication
EVK-IRIS-W1 provides two options for serial communication and debugging:
•MCU-Link (default) chip
•FTDI chip
3.5.1 MCU-Link
The MCU-Link is a powerful and cost-effective debug a that seamlessly integrates with the
MCUXpresso Integrated Developer Environment (IDE). It is also compatible with third-party
IDEs that support CMSIS-DAP protocol. The USB3 MCU-Link port on the EVB provides a USB-
to-UART bridge feature (VCOM) that can be used to provide a serial connection between the
IRIS module and a host computer. MCU-Link is based on the LPC55S69 microcontroller (U13)
and features a high-speed USB interface for a high-performance debugging.
The main UART (UART 3 TX, RX) and the SWD interface signals of the IRIS-W10 module are
connected to the MCU-Link through switches U16 or (R134, R136), U19,or (R142, R143) by
default. Optional connections to the Flexcomm 0 SPI interface through switch U18 and
resistors R259, R260, R261, R262, and connections to the I2C Flexcomm 2 interface through
switch U17, are also possible. The connection options are shown in Figure 20 and further
described in Table 6.
Figure 20: MCU-LINK connections
The MCU-Link JTAG/SWD Debug Probe [3], a free utility from NXP, is compatible with
Windows 10, MacOS, and Linux which provides an easy way to install firmware updates.

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To use the MCU-Link as a SWD debugging probe for an external MCU through J20, populate
R13, R43, R68, R217, R224, R290, R292, R294, R296 with 0 Ωresitors and disconnect
resistors R44, R45, R48, R116, R117, R119, R291, R293.
IRIS-W10 GPIO/Function Connection MCU-Link pin
GPIO 2/SPI0-MOSI Not default 60
GPIO 3/SPI0-MISO Not default 62
GPIO 4/SPI0-CLK Not default 61
GPIO 5/ SPI0-SSELN1 Not default 74
GPIO 13/SWD-CLK Default 54
GPIO 14/SWD-SWDIO Default 81
GPIO 16/FC2-I2C_SDA Not default 86
GPIO 17/ FC2-I2C_SCL Not default 76
GPIO 24/UART3-RXD Default 79
GPIO 26/UART3-TXD Default 70
Table 6: MCU-Link connections
The SWD programming interface on the MCU-Link connects to the JTAG needle connector
(J33) and SWD connector (J39), as shown in Figure 21.
R182 forces the chip to ISP mode when populated with a 0402 0R resistor.
LED1 to LED5 indicate the connection and interfaces status of the chip.
For minimum interference with the IRIS-W10 radio modules, the MCU-Link (U13) is powered
using a separate linear voltage regulator U20,as shown in Figure 9.
Optionally, R211 can be populated with a 1206 0R resistor to power the MCU-Link chip (U13)
from the 3V3output of the DC-DC converter (U11), as shown in Figure 9.
Figure 21: MCU-Link flashing options