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 21 of 40
NXP Semiconductors
MF1S50yyX/V1
MIFARE Classic EV1 1K - Mainstream contactless smart card IC
The configured load modulation is shown in the manufacturer data of block 0 in sector 0.
The exact location is shown below in Figure 14
and Table 19.
Fig 13. SET_MOD_TYPE
Table 17. SET_MOD_TYPE command
Name Code Description Length
Cmd 43h Set load modulation strength 1 byte
Type - Encoded load modulation strength:
strong modulation:01h (default)
normal modulation:00h
1 byte
CRC - CRC according to Ref. 4
2 bytes
ACK, NAK see Table 10
see Section 9.3 4-bit
Table 18. SET_MOD_TYPE timing
T
ACK
min T
ACK
max T
NAK min
T
NAK max
T
TimeOut
SET_MOD_TYPE n=9 T
TimeOut
n=9 T
TimeOut
5 ms
Fig 14. Byte Location of Load Modulation Status in Block 0 / Sector 0
Table 19. Load Modulation Status Indication
Bit Number
Load Modulation Type Hex Value 7 6 5 4 3 2 1 0
strong load modulation 20h (default) 0 0 1 0 0 0 0 0
normal load modulation 00h 0 0 0 0 0 0 0 0
368 µs
59 µs
T
ACK
NAK
T
NAK
59 µs
T
TimeOut
Cmd Type CRC
ACK
PCD
PICC `ACK`
TimeOut
PICC `NAK`
001aan919
aaa-012192
1514131211109876543
Block 0/Sector 0
21Byte 0
Load Modulation Status Byte