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Introduction to nfc

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An introduction of NFC technology. Including relative specs and some applications on Android.

An introduction of NFC technology. Including relative specs and some applications on Android.

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  • 02/07/12
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  • Transcript

    • 1. Ray Cheng Introduction to NFC
    • 2. Outline • Introduction to NFC • Use Cases • Technical Overview • NFC on Android
    • 3. Introduction to NFC • Near Field Communication • A short-range radio technology that enables communication between devices that either touch or are momentarily held close together – NFC is an open-platform technology that is being standardized in the NFC Forum – NFC is based on and extends on RFID. It operates on 13.56 MHz frequency – The NFC communication range is up to 10 cm – The NFC standard supports different data transmission rates such as 106 kBps, 212 kBps, and 424 kBps
    • 4. RFID
    • 5. • NFC tag is a simple, thin device containing an antenna and a small amount of memory • It is a passive device, powered by a magnetic field • Depending on the tag type, the memory can be – Read only – Rewritable – Writable once IC Antenna RFID – TAG
    • 6. • The reader is an active device that generates radio signals to communicate with the tags • The reader powers the passive device when the two are engaged in the passive mode of communication. RFID – Reader/ Writer
    • 7. • NFC devices can operate in three different modes – Read / Write – Peer to Peer – Card emulation • Based on the ISO/IEC 18092, NFC IP-1, and ISO/IEC 14443 contactless smart card standards Operation Modes
    • 8. • The NFC-enabled phone can read or write data to any of the supported tag types in a standard NFC data format. Operation Modes – Read/Write
    • 9. • In P2P mode, two NFC-enabled devices can exchange data • Share Bluetooth or Wi-Fi link setup parameters to initiate a Bluetooth or Wi-Fi link • Exchange data such as virtual business cards or digital photos • Based on the ISO/IEC 18092 standard. Operation Modes – Peer to Peer
    • 10. • In Card emulation mode, the phone can act as a tag or contactless card for existing readers. Operation Modes – Card Emulation
    • 11. • Introduction to NFC • Use Cases • Technical Overview • NFC on Android Outline
    • 12. Use Cases
    • 13. Use Cases
    • 14. Use Cases
    • 15. Use Cases
    • 16. Use Cases
    • 17. • Introduction to NFC • Use Cases • Technical Overview • NFC on Android Outline
    • 18. • NFC Tag Types • Transition Specs • NFC Data Exchange Format (NDEF) Technological Overview
    • 19. • NFC Forum tag types – Type 1 tag – Type 2 tag – Type 3 tag – Type 4 tag • NXP-specific tag type – Type MIFARE Classic Tag Tag Types
    • 20. • Type 1 Tags are cost effective and ideal for many NFC applications – Based on ISO-14443A standard – Read and rewrite capable; also users can configure the tag to be read- only – 96 bytes of memory, expandable up to 2 kB – Communication speed 106 kbits/s – No data collision protection Type 1 Tag
    • 21. • Type 2 Tags are similar to Type 1 Tags and are derived from the NXP/Philips MIFARE Ultralight tag – Based on ISO-14443A standard – Read and rewrite capable; also users can configure the tag to be read- only – 96 bytes of memory, expandable up to 2 kB – Communication speed 106 kbits/s – Anti-collision support Type 2 Tag
    • 22. • Type 3 Tags are derived from the nonsecure parts of Sony FeliCa tags. These tags are more expensive than Types 1 and 2 – Based on the Japanese Industrial Standard (JIS) X 6319-4 – Preconfigured at manufacture to be either read and rewritable, or read-only – Variable memory, up to 1 MB per service – Supports two communication speeds: 212 or 424 kbits/s – Anti-collision support Type 3 Tag
    • 23. • Type 4 Tags are similar to Type 1 Tags and are derived from the NXP DESFire tag – Based on ISO-14443A standard – Preconfigured at manufacture to be either read and rewritable, or read-only – Variable memory, up to 32 kB per service – Supports three different communication speeds: 106, 212, or 424 kbits/s – Anti-collision support Type 4 Tag
    • 24. • This is a proprietary tag type defined by NXP Semiconductors – Based on ISO-14443A standard – Read and rewrite capable; also users can configure the tag to be read- only – Variable memory 192/768/3584 bytes – Communication speed 106 kbits/s – Anti-collision support Type MIFARE Classic Tag
    • 25. • ISO-14443 • NFCIP-1 • MIFARE • FeliCa NFC Relative Specifications
    • 26. • ISO 14443 is a well-known international standard originally developed for contactless chip card communication over a 13.56 MHz radio. • ISO 14443 defines a protocol stack from the radio layer up to a command protocol. ISO 14443
    • 27. • Peer-to-peer communication between two NFC devices is made possible by mechanisms defined in the Near Field Communication - Interface and Protocol Specification, NFCIP- 1, also known as ISO 18092 and ECMA-340 • NFCIP-1 includes two communication modes that allow an NFC device to communicate with other NFC devices in a peer-to-peer manner, as well as with NFCIP-1 based NFC tags NFCIP-1
    • 28. • MIFARE refers to an NFC tag type developed by NXP Semiconductors • MIFARE tags are widely used as memory cards in transportation applications MIFARE
    • 29. • FeliCa is a proprietary NFC tag technology developed by Sony, and it is widely used in proprietary payment and transportation applications in the Asian markets • FeliCa tags are standardized as a Japanese industry standard. The tags are based on the passive mode of ISO 18092, with added authentication and encryption capabilities. FeliCa
    • 30. • The NFC Data Exchange Format (NDEF) specification defines a message encapsulation format to exchange information NDEF
    • 31. NDEF
    • 32. NDEF
    • 33. NDEF
    • 34. NDEF
    • 35. NDEF
    • 36. • Introduction to NFC • Use Cases • Technical Overview • NFC on Android Outline
    • 37. • When a Android Device being engaged with another NFC device, the tag dispatch system start to work • Tag dispatch system retrieve data from another NFC device and decide what to do according to the data • Work closely with Android Intent and Intent Filter NFC on Android
    • 38. Tag Dispatch System Intent NDEFNDEF Activity 1 <Intent Filter> Activity 2 <Intent Filter> Activity N <Intent Filter> … generate NFC – Read/Write
    • 39. • ACTION_NDEF_DISCOVERED: This intent is used to start an Activity when a tag that contains an NDEF payload is scanned and is of a recognized type. This is the highest priority intent, and the tag dispatch system tries to start an Activity with this intent before any other intent, whenever possible. • ACTION_TECH_DISCOVERED: If no activities register to handle the ACTION_NDEF_DISCOVERED intent, the tag dispatch system tries to start an application with this intent. This intent is also directly started (without starting ACTION_NDEF_DISCOVERED first) if the tag that is scanned contains NDEF data that cannot be mapped to a MIME type or URI, or if the tag does not contain NDEF data but is of a known tag technology. • ACTION_TAG_DISCOVERED: This intent is started if no activities handle the ACTION_NDEF_DISCOVERED or ACTION_TECH_DISCOVERED intents Tag Dispatch System
    • 40. Tag Dispatch System
    • 41. Tag Dispatch System
    • 42. Tag Dispatch System
    • 43. • The following example filters for ACTION_NDEF_DISCOVERED intents with a MIME type of text/plain: • The following example filters for a URI in the form of http://developer.android.com/index.html ACTION_NDEF_DISCOVERED
    • 44. • This example illustrates how to retrieve NDEF message from an Intent Obtaining Information from Intents
    • 45. • This example encapsulate a NDEF record with URI information • The following is the corresponding intent filter Obtaining Information from Intents – Absolute URI
    • 46. • This example encapsulate a NDEF record with MIME information • The following is equivalent to the upper example • The following is the corresponding intent filter Obtaining Information from Intents – MIME Media
    • 47. • This example encapsulate a NDEF record with MIME type text/plain data • The following is the corresponding intent filter TNF_WELL_KNOWN_with RTD_TEXT
    • 48. • This example encapsulate a NDEF record with URI data • The following is the corresponding intent filter TNF_WELL_KNOWN_with RTD_URI
    • 49. • This example encapsulate a NDEF record external data • The following is the corresponding intent filter TNF_EXTERNAL_TYPE
    • 50. • An AAR has the package name of an application embedded inside an NDEF record • Android searches the entire NDEF message for AARs. If it finds an AAR, it starts the application based on the package name inside the AAR • If the application is not present on the device, Google Play is launched to download the application Android Application Records (AAR)
    • 51. • Introduction to NFC • Understanding NFC Data Exchange Format (NDEF) messages • Android NFC Basics References
    • 52. Thank you

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