STMicroelectronics – ST25DV-DISCOVERY

The ST25DV-DISCOVERY is a demonstration kit to evaluate the features and capabilities of the ST25DV series. It is based on the NFC ST25DV04K device embedded on a daughter card using a Class 5 antenna and a STM32 processor driving a mother board. A dedicated software stored in the Flash memory is provided.

The ST25DX_Discovery_Mboard is available in two versions. The demonstration edition includes all of the standard edition features with Wi-Fi^®, and BLE (Bluetooth Low Energy) modules to demonstrate various connectivity use cases. The standard edition is used to achieve the demonstration edition features.

The ST25DV04K device is a dynamic NFC/RFID tag IC with a dual interface. It embeds a 4Kbits EEPROM memory. It can be operated from an I²C interface, or by a 13.56MHz RFID reader, or by a NFC phone. The ST25DV04K Class 5 antenna daughter card, included in the kit, can be replaced by Class 1 or Class 6 antennas. For this purpose an ST25DV antennas bundle is available for ordering. Its references are available on the STMicroelectronics web site.

The ST25DV I²C interface uses a two-wire serial interface, consisting of a bidirectional data line and a clock line. The I²C two-wire serial interface behaves as a slave in the I²C protocol. The RF protocol is compatible with ISO/IEC 15693 and NFC Forum Type 5 tag contactless interface. The boards are powered through the USB connectors.

The ST25DV-DISCOVERY (MB1283 & MB1285) schematics, BOM, gerber files, drivers and firmware sources can be downloaded from www.st.com.

Key features

• Two ready-to-use printed circuit boards (PCB):
  • ST25DV_Discovery_Mboard:
  • STM32F405VGT6 LQFP100 32bit microcontroller, with 1Mbyte Flash memory, 192 + 4Kbytes SRAM.
  • LCD color screen (320 x 200 pixels)
  • Touch screen driver
  • Different color LEDs (power, user, ST-link)
  • User push button
  • Joystick for menu selection
  • Reset button
  • On board ST-link for microcontroller firmware upgrade and debug
  • ST-link mini USB
  • User micro USB
  • USB micro or mini connector for board powering
  • Demonstration use cases stored in memory
  • Demonstration edition (optional add-on module) with Bluetooth Low Energy module, Wi-Fi^® module and JTAG 20 pin connector
• ST25DV_Discovery_ANT_C5:
  • 40mm x 24mm, 13.56MHz inductive antenna etched on the PCB
  • ST25DV04K Dynamic NFC / RFID tag
  • I² C interface connector
  • Energy harvesting output (VOUT) with a 10nF capacitance filtering circuit
  • GPO configurable as RF WIP/BUSY output, to indicate that an RF operation is ongoing