Product Data Sheet

MF1S50yyX_V1 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.0 — 3 March 2014
279230 17 of 40
NXP Semiconductors
MF1S50yyX/V1
MIFARE Classic EV1 1K - Mainstream contactless smart card IC
9.3 MIFARE Classic ACK and NAK
The MIFARE Classic uses a 4 bit ACK / NAK as shown in Table 10.
9.4 ATQA and SAK responses
For details on the type identification procedure please refer to Ref. 2.
The MF1S50yyX/V1 answers to a REQA or WUPA command with the ATQA value shown
in Table 11
and to a Select CL1 command (CL2 for the 7-byte UID variant) with the SAK
value shown in Table 12
.
Remark: The ATQA coding in bits 7 and 8 indicate the UID size according to
ISO/IEC 14443 independent from the settings of the UID usage.
Remark: The bit numbering in the ISO/IEC 14443 starts with LSBit = bit 1, but not LSBit =
bit 0. So one byte counts bit 1 to 8 instead of bit 0 to 7.
Table 10. MIFARE ACK and NAK
Code (4-bit) Transfer Buffer Validity Description
Ah Acknowledge (ACK)
0h valid invalid operation
1h valid parity or CRC error
4h invalid invalid operation
5h invalid parity or CRC error
Table 11. ATQA response of the MF1S50yyX/V1
Bit Number
Sales Type Hex Value 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
MF1S500yX 00 44h 0000000001000100
MF1S503yX 00 04h 0000000000000100
Table 12. SAK response of the MF1S50yyX/V1
Bit Number
Sales Type Hex Value 8 7 6 5 4 3 2 1
MF1S50yyX/V1 08h 00001000