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NXP Semiconductors

NFC Tandem User Manual

447202

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2018. All rights reserved.

User manual

Rev. 0.2 — 17 August 2018

COMPANY PUBLIC

8 / 18

Figure 5. NFC Tandem Ntag tuning

3.2.3 Step 3 - Re-adjust reader matching

•

Now the C9 & C10 values defined in Step 1 need to be re-adjusted

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Therefore enable reader mode / disable NTAG

•

Reduce C9 & C10 by 2 x C11(=C12)

–

e.g. C9 & C10 were 100pF à C11 = 33pF

–

New C9 & C10 = 100pF - 2x33pF = 34pF

•

C_fine can now be used to fine tune the reader matching to 13,56MHz

Содержание NFC Tandem

Страница 1: ...0 2 17 August 2018 User manual COMPANY PUBLIC Document information Information Content Keywords NFC PN7150 NTAG I2C plus Abstract This user manual describes the design the use and the software aspect...

Страница 2: ...nformation provided in this document is subject to legal disclaimers NXP B V 2018 All rights reserved User manual Rev 0 2 17 August 2018 COMPANY PUBLIC 2 18 Revision history Rev Date Description 0 2 2...

Страница 3: ...C Tandem concept offers combination of no power NFC functionality of NTAG I 2 C plus and full NFC functionality of PN7150 when powered on NTAG I 2 C plus being visible over NFC interface until the PN7...

Страница 4: ...edentials to NTAG I 2 C plus memory via NFC This could eventually been done by in the shop by the merchant device inbox When powered on the host reading those credentials from the NTAG I 2 C plus memo...

Страница 5: ...ject to legal disclaimers NXP B V 2018 All rights reserved User manual Rev 0 2 17 August 2018 COMPANY PUBLIC 5 18 3 NFC Tandem reference design 3 1 Schematics Figure 1 NFC Tandem reference design sche...

Страница 6: ...nce design comprised of 2 matching tuning areas respectively for PN7150 NTAG I 2 C plus influencing each other Figure 3 NFC Tandem matching tuning 3 2 1 Step 1 Reader matching Plug TX1 and TX2 to an N...

Страница 7: ...NXP B V 2018 All rights reserved User manual Rev 0 2 17 August 2018 COMPANY PUBLIC 7 18 Figure 4 NFC Tandem reader matching 3 2 2 Step 2 Ntag tuning Disable switching transistors V_BAT low GND Place...

Страница 8: ...0 2 17 August 2018 COMPANY PUBLIC 8 18 Figure 5 NFC Tandem Ntag tuning 3 2 3 Step 3 Re adjust reader matching Now the C9 C10 values defined in Step 1 need to be re adjusted Therefore enable reader mod...

Страница 9: ...eader matching re adjusting 3 2 4 Step 4 Check Ntag tuning Enable NTAG mode see Step 1 Check resonance frequency Use contactless method to check reflection on the antenna Should be around 14 0 14 5 MH...

Страница 10: ...see 3 respectively allowing connection to Raspberry Pi board see 5 or Arduino compatible boards e g UDOO Neo see 6 Figure 7 NFC Tandem board 4 1 Hardware setup In order to run NFC Tandem demonstration...

Страница 11: ...ions must be installed NXP TagWriter see 7 NTAG I2C Demoboard see 8 4 3 Initial setup Follow the following steps during initial setup of the NFC Tandem demo only first time using NFC Tandem board 1 Do...

Страница 12: ...ge is reading the NTAG I 2 C plus memory via I 2 C interface and if NDEF WiFi Connection Handover information is found it will use the credential to broadcast related WiFi network Now the NTAG I 2 C p...

Страница 13: ...on create a new dataset of type wifi defining SSID name and password 8 characters minimum as you wish use WPA2 for authentication and AES for encryption and write it to the NTAG I 2 C plus memory 3 Po...

Страница 14: ...tle device that enables people of all ages to explore computing and to learn how to program in languages like Scratch and Python It s capable of doing everything you d expect a desktop computer to do...

Страница 15: ...ion provided in this document is subject to legal disclaimers NXP B V 2018 All rights reserved User manual Rev 0 2 17 August 2018 COMPANY PUBLIC 15 18 14 WiPi WLAN USB Module 802 11n http www newark c...

Страница 16: ...using NXP Semiconductors products and NXP Semiconductors accepts no liability for any assistance with applications or customer product design It is customer s sole responsibility to determine whether...

Страница 17: ...1 NFC Tandem reference design schematics PN7150 and connectors 5 Fig 2 NFC Tandem reference design schematics NtagI2C and antenna 5 Fig 3 NFC Tandem matching tuning 6 Fig 4 NFC Tandem reader matching...

Страница 18: ...e Cases 4 2 1 Service configuration 4 2 2 WiFi and IoT node pairing 4 2 3 Error diagnostic and assistance 4 3 NFC Tandem reference design 5 3 1 Schematics 5 3 2 Matching guide 6 3 2 1 Step 1 Reader ma...

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