Overview
This project is a compact and versatile PCB design featuring an RFID/NFC tag IC. It includes components for writing and managing data on the RFID tag, modern power input options, and flexible microcontroller integration.
Key Features
RFID/NFC Tag Functionality
- Built-in RFID coil, designed using eDesignSuite by ST-Engineering.
- Integrated with the ST25DV04KC RFID/NFC Tag IC, offering:
- 16 KB EEPROM for data storage.
- Communication via the I2C bus.
- Data can be written to the tag using external devices, such as smartphones with RFID capabilities.
Data Storage Support
- Includes a Micro SD card slot for additional data storage.
- Utilizes a 74LVC125 IC for safe voltage level shifting between the 5V logic of the microcontroller and the 3.3V logic of the Micro SD card.
Power Input
- Powered via a USB-C port delivering 5V.
- Configured with 1 kΩ resistors on the CC pins to ensure USB-C standard compliance.
Flexible Microcontroller Integration
- Designed around the AtmegaXX08 series of microcontrollers, specifically the Atmega3208.
- Compatible with other ICs in the same series and package.
Connectivity
- Provides connectors for UPDI and UART for programming and debugging.
- Optional GPIO breakout for additional interfacing needs.
Applications
- Use as an RFID/NFC tag in systems requiring dynamic, writable RFID data storage.
- Embedded designs requiring compact, integrated EEPROM and I2C functionality.
- Systems needing programmable and customizable tag IC solutions.
Schematic