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=== MFRC522 === The MFRC522 supports all variants of the MIFARE Mini, MIFARE 1K, MIFARE 4K, MIFARE Ultralight, MIFARE DESFire EV1 and MIFARE Plus RF identification protocols. '''Features:''' * Support RFID frequency 13.56MHz * Supports ISO/IEC 14443 A/MIFARE and NTAG * Typical operating distance in Read/Write mode up to 50 mm depending on the antenna size and tuning * Supports MF1xxS20, MF1xxS70 and MF1xxS50 encryption in Read/Write mode * Supports ISO/IEC 14443 A higher transfer speed communication up to 848 kBd * Supports MFIN/MFOUT * SPI up to 10 Mbit/s * I2C-bus interface up to 400 kBd in Fast mode, up to 3400 kBd in High-speed mode * RS232 Serial UART up to 1228.8 kBd, with voltage levels dependant on pin voltage supply * Power-down by software mode * Internal oscillator for connection to 27.12 MHz quartz crystal * 2.5 V to 3.3 V power supply [http://www.nxp.com/documents/data_sheet/MFRC522.pdf RC522 Datasheet] <br><br>
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