RC522 13.56 MHz RFID / NFC Reader Module (MFRC522)
Popular contactless 13.56 MHz RFID reader/writer module based on the MFRC522 IC, supporting ISO/IEC 14443 A / MIFARE cards via SPI interface.
Aliase:MFRC522, RC522, RFID-RC522, Mifare Reader, NFC Module
8-Pin Male Header (Top View)
8 Pins
Pinout Table8
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | SDA | Digital | SPI Chip Select / NSS (Active Low) — pull LOW to select module; used as SDA label on module silkscreen |
| 2 | SCK | Digital | SPI Serial Clock (max 10MHz) |
| 3 | MOSI | Digital | SPI Master Out Slave In |
| 4 | MISO | Digital | SPI Master In Slave Out |
| 5 | IRQ | Digital | Interrupt Output |
| 6 | GND | Ground | Ground (0V) |
| 7 | RST | Digital | ResetPower-Down (Active Low) — LOW puts module into power-down/reset state |
| 8 | 3V3 | Power | Supply Voltage (+3.3V ONLY - NOT 5V TOLERANT) |