VTAP 25 Embedded NFC Reader Module Installation Guide

VTAP 25 Embedded NFC Reader Module

Коопсуздук көрсөтмөлөрү

• ЭСКЕРТҮҮ: КОЛДОНУУ
  The VTAP25 module is intended for use by suitably qualified integrators, who will integrate the VTAP25-MOD (surface mount module) into their own hardware, without any changes or modifications to the VTAP25-MOD device. The module is not user-serviceable.
• ЭСКЕРТҮҮ: ESD ЭСКЕРТҮҮЛӨРҮ
  We recommend careful handling and storage of Electrostatic Sensitive Devices (ESDs) during installation. The VTAP25-MOD surface mount module should always be protected by static shielding bags for shipping or storage.
• ЭСКЕРТҮҮ: кубат
  Follow the power supply options described in Section 5.1 Power
  EMC emissions and immunity certifications are only valid when using the VTAP25-MOD reader module in accordance with these instructions.

Бул колдонмону колдонуу

This guide contains the information you need to integrate the VTAP25-MOD reader module into your host hardware.

Consult the other VTAP Guides and Application Notes for more information about configuration methods and communication protocols, including how to update the firmware on your VTAP25 unit, when a new release is available. If you need help with VTAP25-MOD reader module integration beyond what is contained in this guide please contact vtap-support@dotorigin.com .

Негизги өзгөчөлүктөр

• Power supply: 3.3V or 5V DC with on-board power management and USB VBUS detection
• Өлчөмдөрү: 24 мм x 29.3 мм x 5.9 мм (0.95 дюйм x 1.15 дюйм x 0.23 дюйм)
• Castellated (half-holes) SMD mounting (1.5mm pitch)
• Frequency/standards: 13.56MHz, ISO 14443A/B, ISO 15693 and ISO 18092
• Read capabilities: Apple Wallet (VAS and ECP2), Google Wallet (Smart Tap and HCE), NFC Type 1-5, MIFARE® Classic, MIFARE Ultralight, MIFARE DES Fire, NTAG.
• Other NFC modes: Dynamic NFC tag emulation; Gym Kit handoff
• Operator feedback:
  • Buzzer output signal (3.3V logic)
  • Serial LED output signal (3.3V logic)
• Байланыш:
  • USB interface (mass storage, Human Interface Device, USB Virtual COM port)
  • Serial interfaces including UART, SPI slave, I2C slave – all 3.3V
  • UART supports external TTL, RS-232 and/or RS-485 level converters
  • All serial interfaces support both VTAP protocol (passive or active) and OSDP (standard and secure)
• Security: Programmable secure element (reserved for future use)

Please refer to the VTAP25 datasheet and other VTAP documentation for additional information.

Блок диаграмма

Пин сүрөттөө

The VTAP25-MOD reader module has no antenna. Before you can use any VTAP reader functionality, it requires connection of an external antenna, with a suitable matching circuit.

Экологиялык спецификация

1. Сактагыч
   Ambient temperature: -40 to +85°C (-40 to 185°F) Humidity: 0 to 95% RH non-condensing
   Басым: 86-106кПа
2. Максималдуу рейтингдер
   Power supply: 5.5V DC
   VBUS: 5.5V DC
   All I/O: 3.5V DC
   Antenna current: TBC
3. Сунушталган иштөө шарттары
   Power supply: 3.3V or 5V DC
   Ambient temperature: -40 to +85°C (-40 to 185°F) Humidity: 0 to 95% RH non-condensing
   Басым: 86-106кПа
4. Иштөө спецификациялары
   Supply current: TBC
   Wake-up time: 1 sec (configurable)

Electrical integration

Күч
The following power connection scenarios are available:

Powered from Host PSU, no USB connectivity
The module is powered from host PSU on VPWR pin. Input voltage can be 3.3V to 5V.

USB'ден кубатталган
The module is powered from USB on VPWR pin. VBUS is connected to the USB 5V.

Powered from Host, but USB may be plugged in and can power the module
In this scenario, the module is powered from host PSU, but USB may be plugged in at some point and can power the module.

Powered from Host, but USB may be plugged in but NOT power the module
In this scenario, the module is powered from host PSU. USB may be plugged in at some point but will NOT power the module.

Эгерде көлөмү жетишсиз болсоtage at start up, for the VTAP board type to be determined,
VTAP processes will not start and instead the factory LED will flash at 3 second intervals.

NFC антеннасы
As the VTAP25 does not have an NFC antenna, an external matched NFC antenna must be connected to the VTAP25 module to use any VTAP functionality. The antenna can be an off-the-shelf or a custom antenna depending on the project requirements and level of RF design expertise available.

Your choice of NFC antenna will be affected by the type of enclosure you are designing to house the VTAP25 module and the NFC antenna, the desired user experience, and your approach to radio testing and certification of your end product.

• Integrate a suitable tuning circuit into your own antenna assembly;
• Design a separate tuning circuit that can be mounted in between the VTAP25 module and off-the-shelf external antenna

Also pay special attention to the type of the NFC antenna, if it is to be mounted very close to a metal surface / LCD screen.

ЭСКЕРТҮҮ: Always ensure sufficient clearance between the NFC antenna and other RF transmitters, to avoid electromagnetic interference between equipment. Clearance required varies between antennas, depending on antenna size, power and sensitivity.

If you have not yet chosen or designed an antenna and matching circuit, Dot Origin can provide support for integrating off-the-shelf or custom NFC antennas with the VTAP25 in your device, contact vtap-support@dotorigin.com .

Антеннага дал келүү
A matching or tuning circuit ensures that there is optimum power transmitted between the module and the antenna, Tuning is essential to NFC transmission, since imperfect antenna matching or tuning can cause high power loss and poor antenna performance.
Multiple factors can affect the antenna matching, including length of the conductor between the VTAP25 module, matching circuit and the antenna, the size of the antenna and any nearby metal objects. Hence the antenna tuning process should be carried out with the antenna fitted into the final product and mounted in a manner representative of normal use.

Important considerations and examples of tuning circuits suited to specific off-the-shelf antennas are provided in the VTAP Application Note about external antennas.
The VTAP25 has test pads on the bottom of the module for connecting a Vector Network Analyzer (VNA) to measure antenna tuning parameters.
See the Reference schematics section for an example NFC antenna circuit. The values of resistors and capacitors are determined during the antenna matching.

These are the main steps involved in antenna matching circuit design and verification:

1. Find the antenna characteristics of your antenna. This is done by finding DC resistance, self-resonance frequency and inductance of the antenna. These measurements are carried out with the antenna disconnected from the matching circuit. This may involve removing matching circuit components.
2. Calculate the series and parallel capacitor values.
3. Test circuit performance by measuring S11 impedance into the antenna circuits
   (includes filters, matching circuit and antenna). Use the test pads on the bottom of the module to access these nodes.

Although the VTAP25 uses a later generation of NFC front end chip, it is useful to refer to NXP’s Application Note #AN13219 PN7160 antenna design and matching guide for calculations and further help.

Антенна туташуу
If the antenna is part of the PCB copper, tracks from the VTAP25 to the antenna should not exceed 100mm per track. The tracks should be routed as close together as possible to minimize loop area.
The antenna matching circuit may be placed near the VTAP25 or near the antenna. It should not be placed at a midpoint.
It is recommended that any circuits are at least 5mm from antenna tracks. If circuits are placed within the antenna area, a ground plane should be used in the component area, but should be kept as far from the antenna wiring as possible. Circuit connections may cross antenna tracks, but crossings should be perpendicular.

ЭСКЕРТҮҮ: Placing connected circuits inside and outside the antenna area, such that tracks cross the antenna, is likely to increase unwanted radiated emissions.

Where the antenna is connected by wires, it is recommended that tracking between the VTAP25 and connection point of wiring should be as short as possible and not exceed 40mm. Wiring should be twisted pair. It is recommended that you avoid bundling antenna connections with other product wiring. Connectors for wiring do not need to be specialized – simple pin header parts will usually suffice. It is recommended that you avoid connectors where the conductors are more than 3mm apart.

 FCC/ISED approved NFC antenna
Below are the details of the FCC/ISED approved NFC antenna to use with VTAP25:

• Two-layer PCB trace antenna
• Outer dimensions: 40mm x 40mm / 1.57in x 1.57in
• Бурулуштар: 3
• PCB track width: 0.5mm / 0.02in
• Gap between tracks: 0.7mm / 0.0275in
• Series inductance 0.9936uH (@1MHz)

The Dot Origin ANT1, ANT4 and ANT6 boards use 40mm x 40mm PCB trace antennas. Please contact us for more information about these.
Use the tuning circuit below with the 40mm x 40mm antenna.

Note: The VTAP25 module is only FCC/ISED approved when used with this antenna. Certification is only valid when the integrator/manufacturer adheres to the trace reference design provided above.

Аппараттык камсыздоону баштапкы абалга келтирүү
The VTAP25 does not require an external reset signal. However, it is recommended that pin 27 RESET is connected to a suitable GPIO on the host processor to allow it to force a reset of the VTAP25, should this be necessary. Connect pin 27 RESET to the host and pull low to reset the VTAP25.

Перифериялык түзүлүштөр

Сериялык интерфейстер
The VTAP25 reader module offers synchronous and asynchronous communications over two serial comma ports.

1. СЕРИЯ 1
   SERIAL1 allows asynchronous commas at 3V3 logic levels.
2. СЕРИЯ 2
   SERIAL2 may be configured for asynchronous commas, SPI or I2C – all at 3V3 logic levels. By default, SERIAL2 will use synchronous communication (SPI or I2C) unless set asynchronous (UART) communications are configured explicitly in config.txt.
   Use the module pin SERIAL2_TYPE (Pin 2) to choose between SPI and I2C. Pull low for SPI, and pull high for I2C. The host board should connect the SERIAL2_TYPE pin appropriately to select the required communication interface.

Asynchronous commas (3V UART) are enabled using the config.txt.

Optionally, an RS-485 transceiver can be connected to SERIAL2_TX, SERIAL2_RX and SERIAL2_DE (for transmit enable).
See the other VTAP guides and application notes for more information about configuration methods, communication protocols, settings and commands.

Эскертүү: It is recommended that you have a USB data connection (just 4 pins or test pads) provided on the host board to allow for firmware or config update/initialization, in case communication with the host is not available via the preferred interface. For temporary use only, this can be just a direct connection to VBUS, D+, D- and GND (without USB inductors or suppression) for example via an unpopulated 4 way PCB header.

USB
The USB interface is USB2.0. The VTAP25 appears as a removable drive, virtual Com Port
(VCP) and Human Interface Device (HID) on USB. The config.txt file referred to elsewhere is stored on the removable drive. The VCP and HID modes can be configured using the config file.

USB interface is implemented even if it is not required for user function. This will allow access to the module for easy configuration / firmware upgrade if the preferred interface is not available.
If USB mass storage drive is required, ensure the LOCK pin is not pulled low as this will disable the mass storage.

Recommendations for USB
USB layout rules should be followed. A filter and protection circuit is recommended – see NFC USB reader example for a reference circuit.
If connection is via USB-C, fit 5K1 resistor A5 to 0V and 5K1 resistor from B5 to 0V so that the host device can detect connectivity and power identification.

Serial LEDs
The device has serial LED output (Neo pixel) for connecting a chain of up to 255 external serial LEDs. These can be configured to show a default color permanently, and then automatically change color (or flash) in response to a successful pass read, successful card read or error conditions. Custom LED sequences are also possible in response to successful reads.
The output is 3V3 logic and the host must provide 5V translation, as required. The VTAP25 does not provide power for the LEDs. See the example schematics for an external LED circuit diagram.
Refer to the other VTAP guides and application notes for more information on how to configure the serial LED output.

Buzzer
There is also a buzzer output for an external AC buzzer, which can be configured to beep on start-up, or in response to a successful pass or card read. The output is 3V3 logic drive
(50/50 square wave) – user must provide the buzzer driver circuit. See the example schematics for an external buzzer circuit diagram.
Refer to other VTAP guides and application notes on how to configure the buzzer output.

Config bypass on startup
In a scenario where config.txt needs to be bypassed on startup, for example if SERIAL2 interface is erroneously changed to UART, where the physically connected interface is SPI or I2C, you can pull the CONFIG pin (13) low to bypass the configuration on startup. This way the physically connected interface can be connected to the VTAP25 and config.txt can be updated.

Сигнал
The signal output is used as a flag signal for when data is available to be transmitted on the Serial 2 interface (SPI or I2C). This allows the host to avoid continuous polling for data.

Reference schematics

• VTAP25 USB example
  Бул эксample schematic illustrates how to build a simple USB 2.0 reader using the VTAP25. It includes a buzzer circuit, serial LED level shifter and antenna with matching circuit.

•  VTAP25 host powered example
  Бул эксample schematic illustrates how to interface a VTAP25 module to a host processor using 3.3V serial UART commas. It includes a buzzer circuit, an antenna with matching circuit and a 4-pin USB connector for backup access to the VTAP25.

Recommendations for PCB layout

Модуль өлчөмдөрү
The module dimensions are 24mm x 29.3mm x 5.9mm (0.95in x 1.15in x 0.23in).

Сураныч байланышыңыз vtap-support@dotorigin.com for 3D model of the module.

Holes for test pads
To facilitate user tuning, there are six pads on the bottom of the module. The host board must accommodate for these holes for future accessibility. These pads connect to the antenna drive pins on the NFC controller to allow connecting a VNA for tuning purposes and to the receive pins and test-bus pins for future validation. See the VTAP25 footprint for the test pad dimensions.

Из
Бардык өлчөмдөр мм бар.

soldering
Solder the module in a single reflow. Use the lead-free alloy Sn96.5Ag3Cu0.5, also known as the SAC305.

The VTAP25 is rated at the moisture sensitivity level (MSL) of 3. Once the module is unpacked from the sealed bags, it must be soldered within 168 hours under the factory conditions 25 ± 5°C and 60 %RH. If not soldered within this time period, the module needs to be baked before soldering.

Шайкештик

The VTAP25 module has been certified for Apple ECP2/Access and Google Smart Tap, CE, UKCA, FCC, ISED, MIC and Apple VAS. The integrator must usually perform testing of the final product to ensure the compliance is maintained.
Dot Origin can provide support throughout the compliance process. Our engineers have extensive experience of compliance testing and approval processes. Please contact us at vtap-support@dotorigin.com at an early stage of your project to discuss the options and recommended steps involved.

CE / UKCA
The VTAP25 will be tested for CE (RED/safety) / UKCA compliance. However, the host product must be tested for all the relevant directives under CE / UKCA.

 FCC/ISED module integration instructions
The VTAP25 reader module has been tested for modular device approval under FCC rules Part 15 and ISED RSS-210, with a reference host board including a 40x40mm NFC antenna and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. Бул аппарат зыяндуу тоскоолдуктарды жаратпашы мүмкүн.
2.  Бул аппарат келген тоскоолдуктарды, анын ичинде каалабаган операцияга алып келиши мүмкүн болгон тоскоолдуктарды кабыл алышы керек.

These instructions must be followed to maintain the FCC/ISED approval for the VTAP25 reader module, when it is integrated into a host system.

ЭСКЕРТҮҮ: Changes or modifications made to the VTA25 reader module, that have not been expressly approved by Dot Origin Ltd could void the user’s authority to operate the equipment.

1. Applicable FCC/ISED rules
   The VTAP25 reader module operates at 13.56MHz and is therefore subject to FCC/ISED rules for radio frequency devices.
2. Конкреттүү операциялык колдонуу шарттары
   The VTAP25 reader module must be stored and operated under the following conditions:
   • Айлана-чөйрөнүн температурасы -40тен +85°Cге чейин (-40…185°F)
   • Нымдуулук 0 95% RH конденсацияланбайт
   • Басым 86-106 кПа
3. RF таасири жөнүндө ойлор
   Screened cable should be used, wherever possible, to connect VTAP25 reader module to other devices, to avoid interference from other equipment.
   The end-user manual for the host equipment, that contains a VTAP25 module, must clearly indicate the operating conditions to be observed, so that the user remains in compliance with current FCC/ISED RF exposure guidelines.
4. Антенналар
   The VTAP25 reader module has been tested with a reference host board including a 40x40mm NFC antenna. There are no alternative antennas approved for use. When an external antenna is attached, the new arrangement would require a new
   FCC/ISED approval.
5. Энбелги жана шайкештик жөнүндө маалымат
   The integrator must attach a label to the new equipment, hosting the VTAP25 reader module, which states ‘Contains FCC ID: 2A282-VTAP25’ , in accordance with enclosed module ID for FCC approval and ‘Contains IC: 30458-VTAP25’ for ISED approval.
6. Сыноо режимдери жөнүндө маалымат
   The following test modes are recommended to achieve states of maximum emission levels or susceptibility in the VTAP25 reader modules:
   1. VTAP25 reader module powered on. Communicating with PC over USB. Continuously reading tag.
   2. VTAP25 reader module powered on and tag бар, бирок тышкы түзмөк менен байланышпайт.
7. Кошумча тестирлөө талаптары
   The VTAP25 reader module is only FCC/ISED authorized for use in compliance with the specific FCC/ISED transmitter rules listed on the grant. The integrator is responsible for compliance to any other FCC/ISED rules that apply to the host, which are not covered by the modular transmitter grant of certification.
   The final host product, with the VTAP25 module installed, will still require Part 15 Subpart B compliance testing with your NFC antenna, and to evaluate transmission effects when the VTAP25 reader module and host equipment operate at the same time. Typically, Dot Origin can obtain a permissive change on the VTAP25 original modular approval. This is faster and less expensive than a new application. In this case, the integrator must ensure that all the guidelines in this document are followed. We recommend integrators refer to further advice from the FCC OET Knowledge Base, such as 996369 D04 Module Integration Guide v02.

Apple VAS and ECP2
The VTAP25 runs the same firmware as VTAP100 and VTAP50 readers, which are already certified for Apple VAS and Apple ECP2 (Access). The VTAP25 is already certified for ECP2/Access and certification is in progress for Apple VAS.
There are some steps required in order to maintain Apple VAS(ECP1) and/or ECP2/Access compliance.

When you request an NFC entitlement and/or permission for an Apple Access deployment we recommend that you inform Apple that a Dot Origin VTAP OEM board or module has been used in your finished product. Apple are aware that our products are available both in finished form and as OEM modules.

• For VAS applications Apple reserves the right to review the final form factor of the reader, to ensure that satisfactory performance and user experience is maintained.
• For ECP2 applications it is essential that the new equipment hosting a VTAP reader board or module is tested and certified against Apple Access specifications. This includes ensuring that the read range meets their minimum distance requirements (40mm at various presentation angles, in Express and CDCVM modes) and that the reader is tested against all the different categories of iPhone and Apple Watch, as required by Apple. Apple may also require on-site functional testing as part of the end-to-end certification of an Apple Access deployment, which is usually conducted by the Credential Manager.

In both cases, our engineering team can advise and assist on certification issues, which could include taking a product through formal certification, if required.

Google Smart Tap
The VTAP25 runs the same firmware as VTAP100 and VTAP50 readers, which are already certified for Google Smart Tap. The VTAP25 will also be certified for Google Smart Tap.
The integrator should test the final product with NFC passes in Google Wallet of different Android phones prior to rolling out, to ensure the compliance is maintained.

Recommendations for EMC
To ensure that the final product is compliant with various standards for radiated and conducted emissions, please follow the guidelines in this document relating to USB and antenna track placement and external connections.

WARNING: FCC COMPLIANCE

This device when combined with the approved antenna complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. Бул аппарат зыяндуу тоскоолдуктарды жаратпашы мүмкүн жана
2. Бул аппарат келген тоскоолдуктарды, анын ичинде каалабаган операцияга алып келиши мүмкүн болгон тоскоолдуктарды кабыл алышы керек.

ЭСКЕРТҮҮ: Бул жабдуу сыналган жана FCC Эрежелеринин 15-бөлүгүнө ылайык, В классындагы санариптик аппараттын чектөөлөрүнө жооп берери аныкталган. Бул чектөөлөр турак жай орнотулган зыяндуу кийлигишүүлөрдөн акылга сыярлык коргоону камсыз кылуу үчүн иштелип чыккан.
Бул жабдуу радио жыштык энергиясын өндүрөт, колдонот жана нурландыра алат жана эгер нускамаларга ылайык орнотулбаса жана колдонулбаса, радио байланыштарына зыяндуу тоскоолдуктарды жаратышы мүмкүн. Бирок, кандайдыр бир орнотууда кийлигишүү болбойт деген кепилдик жок.
Эгерде бул жабдуу радио же телевизорду кабыл алууда зыяндуу тоскоолдуктарды жаратса, аны өчүрүү жана күйгүзүү аркылуу аныктоого болот, колдонуучуга төмөнкү чаралардын бири же бир нечеси аркылуу тоскоолдукту оңдоого аракет кылуу сунушталат:

• Кабыл алуучу антеннанын багытын өзгөртүңүз же башка жерге которуңуз.
• Жабдуу менен кабыл алгычтын ортосундагы бөлүнүүнү көбөйтүңүз.
• Жабдууларды ресивер туташтырылгандан башка схемадагы розеткага туташтырыңыз.
• Жардам алуу үчүн дилерге же тажрыйбалуу радио/телевидение техникине кайрылыңыз.

Шайкештик үчүн жооптуу тарап тарабынан ачык бекитилбеген өзгөртүүлөр же модификациялар колдонуучунун жабдууларды иштетүү укугун жокко чыгарышы мүмкүн.

These requirements set a SAR limit of 1.6 Wkg averaged over one gram of tissue. The highest SAR value reported under this standard during product certification is 0.094 Wkg
If the identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module, Contains FCC ID: 2A282-VTAP25.

Бул модулдун бир эле учурда иштеген башка өткөргүчтөр менен бирге жайгашуусу көп өткөргүч процедураларын колдонуу менен бааланышы керек.
Хост интегратору бул документте берилген интеграциялык нускамаларды аткарышы керек жана композиттик системанын акыркы продукты техникалык баалоо же эрежелерге жана KDB 996369 Жарыялоосуна баа берүү менен талаптарга шайкеш келишин камсыздоосу керек.

Бул модулду өз өнүмүнө орнотуп жаткан хост-интегратор акыркы курамдык продукт техникалык баалоо же эрежелерге баа берүү аркылуу талаптарга, анын ичинде өткөргүчтүн иштешине жооп бериши керек жана KDB 996369 нускамасына кайрылышы керек.

WARNING: ISED COMPLIANCE
This device when combined with the approved antenna contains license-exempt transmitter(s) that comply with Innovation, Science and Economic Development Canada’s license-exempt RSS(s). Operation is subject to the following two conditions:

1. Бул аппарат тоскоолдук жаратпашы мүмкүн жана
2. This device must accept any interference, including any interference that may cause undesired operation of the device.

If the identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module, Contains IC: 30458-VTAP25.

Континент IC: 30458-VTAP25.
These requirements set a SAR limit of 1.6 W/kg averaged over one gram of tissue. The highest SAR value reported under this standard during product certification is 0.094 W/kg.

If you need help to set up or use your VTAP25 module, beyond what is contained in this Integration Guide, then please contact our support team.

Электрондук почта: vtap-support@dotorigin.com
Акыркы документтерди жана микропрограмманы жүктөп алыңыз https://vtapnfc.com Telephone UK and Европа: +44 (0) 1428 685861
Telephone North America and Latin Америка: +1 (562) 262-9642

If you have any feedback on setting up or using your VTAP25 module or this documentation, then please contact our support team. The product is constantly being reviewредакцияланган жана жакшыртылган жана биз сиздин тажрыйбаңыз тууралуу пикирлерди баалайбыз.

Copyright 2025 Dot Origin Ltd. Бардык укуктар корголгон.
No part of this Integration Guide may be published or reproduced without the written permission of Dot Origin Ltd except for personal use. This Integration Guide relates to correct use of the VTAP25 module only. No liability can be accepted under any circumstances relating to the operation of the user’s own PC, network or infrastructure.

Dot Origin Ltd
7-бөлүм, Coopers Place Business Park, Combe Lane, Wormley
Godalming GU8 5SZ Улуу Британия
+44 (0) 1428 685861