Quickcool Radio modules KEYFOB-MF1K-02PVC-WHEP Data Sheet

MF1S50YYX

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2011. All rights reserved.

The MF1S50yyX chip consists of a 1 kB EEPROM, RF interface and Digital Control Unit. 
Energy and data are transferred via an antenna consisting of a coil with a small number of 
turns which is directly connected to the MF1S50yyX. No further external components are 
necessary. Refer to the document 

 for details on antenna design.

RF interface:

– Modulator/demodulator

– Rectifier

– Clock regenerator

– Power-On Reset (POR)

– Voltage regulator

Anticollision: Multiple cards in the field may be selected and managed in sequence

Authentication: Preceding any memory operation the authentication procedure 
ensures that access to a block is only possible via the two keys specified for each 
block

Control and Arithmetic Logic Unit: Values are stored in a special redundant format and 
can be incremented and decremented

EEPROM interface

Crypto unit: The CRYPTO1 stream cipher of the MF1S50yyX is used for 
authentication and encryption of data exchange.

EEPROM: 1 kB is organized in 16 sectors of 4 blocks. One block contains 16 bytes. 
The last block of each sector is called “trailer”, which contains two secret keys and 
programmable access conditions for each block in this sector.

The commands are initiated by the reader and controlled by the Digital Control Unit of the 
MF1S50yyX. The command response is depending on the state of the IC and for memory 
operations also on the access conditions valid for the corresponding sector.

After Power-On Reset (POR) the card answers to a request REQA or wakeup WUPA 
command with the answer to request code (see 

, ATQA according to ISO/IEC 

14443A).

In the anticollision loop the identifier of a card is read. If there are several cards in the 
operating field of the reader, they can be distinguished by their identifier and one can be 
selected (select card) for further transactions. The unselected cards return to the idle state 
and wait for a new request command. If the 7-byte UID is used for anticollision and 
selection, two cascade levels need to be processes as defined in ISO/IEC 14443-3.