K663 Coupler (TTL, 232 or 485)

K663 Coupler (TTL, 232 or 485)

Serial interface contactless reader (coupling device), on antenna

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These coupling devices fit for adding a RFID HF/NFC reader/writer to any microcontroller-based product or to any embedded system with a serial interface (UART). They are able to communicate with contactless cards or compliant badges at a distance up to 10cm.And thanks to the Low Power Standby mode (LPCD), the modules can be used even with power-constrained systems.

The SpringCard K663-TTL, K6632-232 et K663-485 are made up of the K663 module linked with a 69x45mm antenna.
Communication with host is with a serial link according to your needs:

  • K663-TTL: RX/TX serial link at TTL level (0-5V) communication, in comliance with CMOS (0-3V)
  • K663-232: RX/TX serial link at RS-232 level (EIA 232 : -6/+6V) communication
  • K663-485: RS-485 (EIA 485) half-duplex serial communication

They only require a single 3 to 5V power supply, and support in-field firmware upgrade (available here).

Here is a presentation of the K663 TTL, 232, 485 module in video.


  • JST SHR-8 industrial connector
  • Flexibly powered: from 3V up to 5V
  • Wide choice of serial interfaces
  • 69x45mm, thickness < 20mm
  • 2-year limited warranty
  • RoHS & WEEE compliant (environmental protection)
  • Carrier frequency: 13.56MHz
  • ISO 14443 (1, 2, 3 and 4, both type A and type B): Proximity Coupling Device (PCD)
  • ISO 15693 (1, 2, 3): Vicinity Coupling Device (VCD) or Base Station for RFID labels and tags
  • ISO 21481 (ECMA 352): the device is able to communicate with any NFC object running in card emulation mode
  • ISO 18092 / NFC peer-to-peer (initiator, passive communication mode only)
  • Coupler's firmware embeds T=CL protocol (ISO-DEP), 256-byte frames
RF Bitrate
  • 106, 212, 424 or 848kbit/s (ISO 14443, NFC-A & NFC-B), 212 or 424kbit/s (FeliCa, NFC-F), 26kbps (ISO 15693, NFC-V)
Supported cards/tags/labels
  • ATMEL CryptoRF
  • ASK CTS256/CTS512
  • Calypso (CD97, CD21, GTML, etc), Innovatron radio protocol "14443 B'"
  • FeliCa Lite, Lite-S (NFC Forum T3T)
  • HID iClass, Inside PicoTag (UID only)
  • Infineon SLE66 family
  • Innovision Jewel, Topaz (NFC Forum T1T)
  • NXP Mifare UltraLight, NTAG (NFC Forum T2T), Mifare Classic, Mifare Plus, Desfire, SmartMX...
  • NXP ICODE-SLI family
  • ST MicroElectronics SR, SRI, SRIX families
  • ST MicroElectronics LR family
  • Texas Instrument my-d proximity
  • Texas Instrument my-d vicinity
  • Low power card detection mode (LPCD) to reduce power consumption while waiting for a contactless card
  • Integrated
Host interface details for all versions
  • Serial - 38400 or 115200bps
  • SpringProx binary or ASCII protocol
TTL version Host Interface
  • TTL / CMOS compliant (0-5V or 0-3V)
232 version Host Interface
  • RS-232 (-6 / +6 V)
485 Version Host Interface
  • RS-485 (differential - bus)
Software integration / development
  • Free SDK featuring 'SpringProx API' (full ANSI C source code+ binary for Windows and Linux)
  • 3 to 5V DC
  • 8-pin JST SHR (serial link)
Firmware upgrade
  • In-field, no physical action on the device using SpringCard FUU application (provided that the RESET pin is controlled by the host)
User manuals Development manuals SDKs & tools for developers Hardware Integration Utilitaire Softwares Certifications

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