Description
RC522 RFID Reader Module
This RFID reader/writer module is based on NXP’s MFRC522 frontend and communicates with a microcontroller over SPI. It operates at 13.56 MHz and is intended for compatible contactless cards and tags, including ISO/IEC 14443 Type A / MIFARE products.
🔧 Listed and chip-reference specifications
- Reader IC: NXP MFRC522
- RF operating frequency: 13.56 MHz
- Host connection listed for this module: SPI
- MFRC522 SPI interface: up to 10 Mbit/s
- MFRC522 IC supply: 2.5–3.3 V nominal (check the exact board and its documentation)
- Listed module supply: 3.3 V DC
- Listed board dimensions: 66 × 40 × 8 mm; confirm against the supplied board revision
- Listed reading distance: up to 60 mm; actual range depends on the antenna, tag, tuning, alignment and surroundings. NXP specifies typical read/write distance up to 50 mm depending on antenna size and tuning.
The French listing states compatibility with several MIFARE card families and says a card and key-fob tag are included. Supplied accessories and supported tag types can vary; verify the labels and contents of the delivered set.
⚙️ How it works
The reader creates a 13.56 MHz field and exchanges data with a compatible nearby tag. The host microcontroller sends commands and receives responses over SPI. The module can be used in identification and access-control prototypes, but reading a public tag UID alone is not strong authentication and should not be used as the sole protection for a real door or valuable asset.
🔌 Connection and voltage caution
Use 3.3 V supply and logic unless the specific breakout documentation confirms otherwise. Do not assume its pins tolerate 5 V because it can be connected to an Arduino. Check the pin labels and your controller’s SPI pin mapping before wiring. Typical signals are SS/SDA, SCK, MOSI, MISO, IRQ, GND, RST and 3.3 V; the exact names and pin order may differ.
💡 Typical applications
- RFID tag/card reading demonstrations
- Microcontroller identification prototypes
- Inventory and attendance experiments
- Learning SPI communication and contactless-card interfaces
Security note: use appropriately secured cards and a proper authentication design for real access control. UID-only checks and sample/demo cards are not a substitute for a security review.
