SparkFun Qwiic Dynamic NFC/RFID Tag

The SparkFun Qwiic Dynamic NFC/RFID Tag is an innovative product that features the cutting-edge ST25DV64KC dynamic Near Frequency Communication (NFC) / Radio Frequency Identification (RFID) tag IC from STMicroelectronics. This tag offers 64-kBit (8-kBytes) of EEPROM memory, accessible via both I²C and RF (NFC). It is designed to meet ISO/IEC 15693 and NFC Forum Type 5 standards, and has the capability to read and write the tag's memory using NFC, even when the tag is powered down or disconnected.

The SparkFun Qwiic Dynamic NFC/RFID Tag is equipped with a 64 Kbit EEPROM, allowing users to write and read data. It also features a general-purpose output for reporting various events such as RF field changes, RF activity, and I²C writes. The IC operates within a supply voltage range of 1.8V to 5.5V, but it runs at 3.3V when used in a Qwiic circuit. Additionally, it includes an energy harvesting pin that can output µW of power when an RF field of sufficient strength is present.

One of the unique features of the ST25DV64KC is its support for a fast transfer mode. This allows for the contents of a 256-byte buffer to be sent between a device connected to the tag over I²C and an RF device such as a reader or smartphone. This means that data stored on the tag can be read by an RF device by simply bringing it into the RF read range, even if the tag is powered off. The data can also be password protected with a 64-bit value.

SparkFun provides an Arduino Library that includes all the necessary methods for reading and writing user memory, controlling read and write permissions, altering area sizes, and applying password control. Extra methods are also included for reading and writing NDEF (NFC Forum Data Exchange Format) URI, WiFi, and Text records that your smartphone can understand. The library has been tested with ST's "NFC Tap" App, available on both the Apple App Store and Google Play. For Android users, wakdev's NFC Tools is also recommended.

The SparkFun Qwiic Connect System is a comprehensive ecosystem of I²C sensors, actuators, shields, and cables that facilitate faster and error-free prototyping. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector, which reduces the amount of required PCB space. The polarized connections also ensure that you can't hook it up incorrectly.

For those interested in getting started with the Qwiic Dynamic NFC/RFID Tag, a comprehensive guide is available. The guide includes information about the ST25DV64KC features, Arduino Library features, and a list of relevant documents and resources. These resources include schematic, eagle files, board dimensions, hookup guide, datasheet, apps, Qwiic information page, Arduino Library, library documentation, and GitHub hardware repo.