NXP Semiconductors NTAG I2C plus User manual

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Document information
Info
Content
Keywords
NTAG I2C plus, Explorer Kit, Android, NFC tag
Abstract
This User Manual describes the functionalities and how to use the
Android and PC application of the NTAG I2C plus Explorer kit. Both
applications provide the same functionality
and have the same look and
feel so this User Manual is valid for both.

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Contact information
For more information, please visit:
http://www.nxp.com
Revision history
Rev
Date
Description
2.1
20170309
Update - Bluetooth Pairing added
2.0
20170201
Updates
1.0
20160216
Initial Version

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1. Object
NTAG I2C plus Explorer kit is an all-in-one demonstration and development resource to
demonstrate the unique properties of the NTAG I2C plus connected tag. By including a
full complement of hardware and software tools, users can investigate the capabilities of
the chip through the various demonstrations, develop and test their own applications
(with additional LPC-Link2 debug probe1).
This User Manual explains how to use the NTAG I2C plus demo application for Android.
The Windows app is not detailed in this User Manual since it provides identical
functionalities as the Android app, therefore the same User Manual is valid.
Technical aspects related to the IC features are beyond the scope of this document. To
get further technical details please consult the dedicated Datasheet “NTAG I2C plus, NFC
Forum Type 2 Tag compliant IC with I2C interface” (refer to [NTAGI2Cplus]).
1www.nxp.com/LPC-LINK2

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2. NTAG I2C plus introduction
The NTAG I2C plus part of NXP’s NTAG family offering both contactless and contact
interfaces. In addition to the passive NFC Forum compliant RF interface, the NTAG I2C
plus provides an I2C interface that allows the IC to communicate with the microcontroller
when the chip is powered by an external device, i.e. a NFC mobile phone.
The NTAG I2C plus operating in energy harvesting mode provides the possibility to
supply external low power devices (e.g. microcontrollers) with the energy generated from
the RF field of the external NFC device.
Fig 1. NTAG I2C plus
The NTAG I2C plus product has two types of memories:
1. EEPROM memory compliant with the NFC Forum Type 2 Tag implementation.
2. 64-byte SRAM memory, which is mapped to the EEPROM memory and it is
externally powered.
The NTAG I2C plus features a pass-through mode that allows fast download and upload
of data from the RF interface to the I2C interface and vice versa. This functionality makes
use of the SRAM memory that allows fast data transfer between interfaces without the
EEPROM performance limitations.
In addition to the I2C interface functionality, the NTAG I2C plus product features an Event
Detection pin for waking up the connected host devices or synchronizing the data
transfer between the two interfaces.
The NTAG I2C plus offers the possibility to protect the memory access. This protection is
done by authenticating the tag with a password. When the tag is protected,
authentication is needed to access the memory. The NTAG I2C plus also improves the
speed when writing into the SRAM memory.

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3. NTAG I2C plus Explorer kit contents
The NTAG I2C plus Explorer kit (NEK) consists of hardware and software tools that
developers can use to understand the NXP NTAG I2C plus functionalities and create first
prototypes to demonstrate its potential for other application. The kit includes:
3.1 Hardware components
3.1.1 NTAG I2C plus Explorer Board
A hardware board based on the NXP LPC 11U24 microcontroller (refer to [LPC11U24]),
with on-board LCD display, NXP LM75B temperature sensor (refer to [LM75B]), voltage
monitors, I2C serial bus connector, JTAG/SWD debug connector, RGD LED micro USB
connector and five push buttons.
Fig 2. NTAG I2C plus Explorer Board (refer to [EXPLORER])

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3.1.2 Antenna board
The antenna board carries the NTAG I2C plus 2k version itself and provides two
interfaces:
•The RF interface to an NFC device.
•The I2C interface to the host, e.g. the NTAG I2C plus Explorer board.
The design files for both the PCB and Flex antenna can be found on the web page (refer
to [PCB Antenna]and [Flex Antenna]
Fig 3. PCB and Flex antenna boards with NTAG I²C plus IC
3.1.3 Field detector board
The position of the antenna of NFC devices vary from device to device. To use the
Explorer Kit with an NFC Device, NFC radio needs to be enabled. To find the position of
the antenna, it is convenient to use the included field detector board. The LED helps to
find the antenna position.
Design files may be downloaded from the demo board homepage (refer to [Field
Detector])
Fig 4. Field detector board

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3.1.4 USB reader
Instead of a NFC device, the USB (PCSC) reader (Identiv uTrust CLOUD 3700F) may be
used in combination with the Windows app to develop applications.
Fig 5. Identiv uTrust CLOUD 3700F reader
To install the reader, download latest driver from the web page (refer to [Identiv]), extract
“Identiv uTrust Installer.zip” and install it with no reader connected.
In Windows 7 operative systems, when a smartcard is placed over the reader there is
frequently an issue regarding the smartcard mini-drivers. Although a solution to this
problem is given in this section, more information can be found on the Windows Support
Webpage2. To solve this issue the Smart Card Plug has to be disabled and Play in local
Group Policy has to be changed to primary group policy settings for smart cards. The
procedure is as follows:
1. Click Start, type gpedit.msc in the Search programs and files box, and then
press ENTER.
2. In the console tree under Computer Configuration, click Administrative
Templates.
3. In the details pane, double-click Windows Components, and then double-
click Smart Card.
4. Right-click Turn on Smart Card Plug and Play service, and then click Edit.
5. Click Disabled, and then click OK.
6. Click Start, type regedit.exe in the Search programs and files box, and then
press ENTER.
7. Go through the tree key, on the left, up to the key
•HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Cryptography \
Calais for 32-bit system or
•HKEY_LOCAL_MACHINE \ SOFTWARE \ Wow6432Node \ Microsoft \
Cryptography \ Calais for 64-bit system
8. Add a new DWORD value named CardDisconnectPowerDownDelay and set its
value to 0.
9. Click Start, type services.msc in the Search programs and files box, and then
press ENTER.
10. Find the smart card service in the list, right-click and click Restart.
11. Now you may plug the reader
2https://support.microsoft.com/en-us/kb/976832.

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3.1.4.1 USB Reader firmware update
In some cases, reader is not functioning properly with Windows “NTAG I²C plus Demo”
application. This is due to newer Reader´s firmware. In this case, it needs to be updated,
using patch tool3.
3.2 Software components
3.2.1 NTAG I2C plus Explorer board firmware
The firmware runs on the NTAG I2C plus Explorer board and is flashed during production
at the MCU which supports the demonstration functionality of the hardware. The
delivered NTAG I2C plus Explorer board firmware consists of three applications:
•NTAG_I2C_Explorer_Bootloader: This project implements the secondary
bootloader application. It is flashed at on-chip memory address starting at
0x0000 0000 and it is the first application to be executed after the MCU boots.
This application has three functions:
oJump to the start memory of the user application.
oEnter into flashing mode functionality.
oEnter into USB mode (Peek and Poke).
•NTAG_I2C_Explorer_Demo: This project implements the logic supporting the
Android / Windows demonstration applications. It is flashed at on-chip flash
memory starting at 0x0000 4000 address and it is executed after the bootloader
jumps to the application start address.
•NTAG_I2C_Explorer_Blink: This is a sample project that sets into blinking mode
the NTAG_I2C Explorer board as soon as the RF field is detected. This
application is provided to illustrate the NFC flashing functionality and its binary
image is provided embedded by default into the Android app (see Section 4.5).
3.2.2 Android app
The demo application on an Android NFC phone (“NFC mobile”) showcasing the various
features of the NTAG I2C plus. The NTAG I2C Demo application is available for download
from the public NXP website as well as at Google Play.
3http://www.nxp.com/demoboard/OM5569-NT322ER/documents/software/SW4044.zip

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Fig 6. Android app GUI
Note: The UM10989 (refer to [UM10989]) describes in detail how to get started with the
development of Android Applications.
3.2.3 Windows app
Together with the USB reader, the Windows app can be utilized to substitute a missing
NFC mobile phone. The Windows app has similar functionalities as the Android app. This
software component is available as a download from the public NXP website. The
software will include a setup file which will install the Windows App in the folder ‘Program
files/NXP Semiconductors’, this installation process will create a shortcut to the Windows
App on your desktop. No further procedure is required to run this application.
1. Download the NTAG I2C Demo App (refer to [PC App])
2. If not done, install the Identiv uTrust driver as described above and the NTAG I2C
Demo App
3. Launch the NTAG I2C Demo App
There are some points to consider when using the Windows App, since it is connected to
an external reader via USB. There are sometimes issues with the connection between
the reader and the tag. On these cases, it is recommended to restart the app and re-plug
the reader.

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Fig 7. Windows application GUI
Note: The Windows application functionalities, GUI and look and feel are intentionally
made the same as the Android application. The Windows application is intended to run in
a Windows environment together with the Identiv uTrust CLOUD 3700F reader as a
substitute in case an NFC phone is not available. Therefore, this User Manual is valid for
both the Android app and Windows application. However, only Android app screenshots
are shown in this document.
3.2.4 Peek and Poke GUI
The Peek and Poke GUI is a Windows app that can be used to examine the detailed
memory contents of the NTAG I2C plus EEPROM via I2C interface. From hardware point
of view only a USB cable connection from the board to the PC is needed (no need of the
USB NFC reader). This software component is available as a download from the public
NXP website (refer to [Peek&Poke]).
.

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Fig 8. Peek and Poke GUI
Note: The UM10967 (refer to [UM10967]) describes in detail how to get started with the
Peek and Poke tool and the different functionalities it offers.

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4. NTAG I2C plus Explorer Demo app
The Android application is intended to operate on devices running Android version 4.0
and above. The application has been optimized for a correct visioning of the graphical
elements in smartphones featuring different resolutions.
As seen in Fig 9, the Android application consists of two demos that can be launched
from the main activity of the application and four configuration functionalities that are
accessed from the configuration selection view in the main activity.
Fig 9. Application overview
4.1 Demo tab
After the Splash window closes, the Demo tab will appear. This screen allows the user to
launch the Demo tab itself, the NDEF demo tab, the Speed demo tab and access the
Configuration tab, with all configuration functionalities supported by the application.
Regarding the Demo tab, it allows demonstrating:
•The Energy harvesting functionality of the NTAG I2C plus that enables the
powering up of the complete demo kit board with the energy harvested from the
RF interface without any battery.
•The RF to I2Ccommunication enabling us to modify the LED color by pressing the
related color button on the NFC device screen.
•The I2C to RF communication as the set of push buttons pressed by the user on
the demo kit board reflected on the NFC device screen.
•The dynamic bidirectional communication between the two interfaces as the
temperature value as well as the voltage on the energy-harvesting pin get
dynamically updated on both the low power screen and the NFC device screen.

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Fig 10. Demo tab snapshot

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4.1.1 Configuring NEK board to demonstrate RF to I2C communication
The board configuration part of the demonstration shows how the NTAG I2C plus passes
a command from the RF input through the SRAM and I2C serial interface output to the
microprocessor, which acts upon the command and lights the appropriate LED.
1. Touch one of the colored board configuration buttons on your mobile device. The
NTAG icon then changes color, indicating the color selection.
2. Tap your mobile device on the antenna. When properly placed, the LED will
illuminate in the chosen color. Optionally, the LCD display will display the
harvested voltage, the temperature sensed by the board, the default text or the
stored NDEF message if the corresponding options are enabled in the board
configuration menu.
Fig 11. Green LED board configuration selection

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4.1.2 Reading board input to demonstrate I2C to RF communication
The three colored buttons on the NEK board demonstrate information from the board
beings transferred from the microprocessor through the I2C serial bus to the NTAG I2C
plus, which then sends it via the RF field to the mobile device for display. When pressed,
each colored button on the NEK board will cause a corresponding shade off on the board
input NXP logo.
Fig 12. Reading board input

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4.1.3 Temperature sensor
The NEK board incorporates a temperature sensor for measuring the ambient
temperature. This information can be shown in the Demo tab of the Android/PC
application. Additionally it can be shown in the LCD display if the option is checked in the
menu.
This operation demonstrates the NTAG I2C plus operating in pass-through mode, in
which data passes through its SRAM. It is also another demonstration of passing data
from the microprocessor through the I2C serial bus to the NTAG I2C plus, which can be
read through the RF interface for display on the mobile device.
Fig 13. Temperature sensor demonstrates SRAM pass through mode

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4.1.4 Enabling LCD display
You can enable the NEK board LCD by touching the Enable LCD selection box. When
doing so, the LCD will show the predefined NTAG I2C plus Explorer text message, the
energy harvested and, if enabled, the temperature sensed by the board in Celsius and
Fahrenheit degrees.
Once again, this operation demonstrates the NTAG I2C plus chip operating in pass-
through mode sends a command from the RF input through the I2C serial interface output
to the microprocessor, which in turn acts upon the command and turns on the LCD
display.
Fig 14. Enabling NEK board LCD

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4.1.5 Displaying NDEF text message on the NEK board LCD
You can display the NDEF text message on the NEK board LCD by touching the Display
NDEF message on LCD selection box.
Again, this operation demonstrates the NTAG I2C plus operating in pass-through mode.
First, the NDEF message is read from the NTAG I2C plus EEPROM memory and is
transferred to the MCU using the SRAM memory, which displays it in the display.
Fig 15. Displaying NDEF text message on NEK board LCD

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4.2 NDEF tab
The NDEF tab allows the user to read or write an NDEF message to the NTAG I2C plus
EEPROM. Actually, it could be used to read or write an NDEF message to any NFC
Forum Type 2 Tag, such as a MIFARE Ultralight, NTAG21x, ...
On the Read NDEF mode, the application reads the NDEF message TLV from the NTAG
I2C plus and returns its content and the type of NDEF message.
On the Write NDEF mode, the application allows the user to write a Text type, URI type,
Bluetooth pairing type or Smart Poster NDEF message.
•Text record type is used to store plain text data.
•URI record type allows NFC tags to trigger actions on the NFC device (usually the
smartphone), such as opening a webpage or sending an SMS message.
•Bluetooth pairing NDEF messages contain information about a Bluetooth device
that allows the smartphone to pair with that Bluetooth device by just tapping the
tag. In the case of writing a Bluetooth pairing type message, it is important to
remember that the MAC address shall be 6 bytes, in hexadecimal (therefore, 12
characters from 0 to F).
•Smart Poster record type defines a structure including a URI record type and a
Text record type as building blocks.
The NDEF tab also contains a Write default NDEF message button. When this button is
pressed, the application automatically writes a NDEF Smart Poster message with the 2
records (optionally 3):
•Text record “NTAG I2C plus EXPLORER”
•URI content: www.nxp.com/demoboard/OM5569.
•Optionally: AAR (Android Application Record)
More on Write default NDEF message is described below in section 4.2.2.

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Fig 16. NDEF tab snapshot
When the NDEF message has been successfully written the “write tag successfully done”
popup appears temporarily in the application informing the user that the message has
been correctly written. There is no need to tap the tag again if you want to write multiple
NDEF messages and read them in between.
In order to learn more about the different types of NDEF messages and what structure
they have, please refer to the following NFC Forum specifications:
“NFC Data Exchange Format (NDEF) Technical Specifications”
“NFC Record Type Definition (RTD) Technical Specification”
“NFC Text RTD Technical Specification”
“NFC URI RTD Technical Specification”
“NFC Forum Connection Handover Technical Specification”
“NFC Smart Poster RTD Technical Specification”
“Bluetooth Secure Simple Pairing Using NFC”