Overview
The UltraLight card is a 512-bit contactless IC card.
Electrical characteristics
The capacity is 512 bits, divided into 16 pages, 4 bytes per page
Programmable lock read-only function per page
32-bit user-definable one-time programming area
384-bit user read and write area
Data can be retained for 2 years and can be rewritten 1000 times
Unique 7-byte serial number
Working frequency: 13.56MHZ
Communication rate: 106KB baud rate
Anti-collision: multiple cards can be processed at the same time
Reading and writing distance: within 100mm (related to the antenna)
No power in the card
Storage structure
The UltraLight card has a total of 512 bits and is divided into 16 pages with 4 bytes per page. The storage structure is as follows:
Page number
Byte 0
Byte 1
Byte 2
Byte 3
Description
0
SN0
SN1
SN2
BCC0
Serial Number
1
SN3
SN4
SN5
SN6
Serial Number
2
BCC1
Reserved
Lock0
Lock1
Hold / Lock
3
OTP0
OTP1
OTP2
OTP3
OTP
4
Data0
Data1
Data2
Data3
Data read/write
5
Data4
Data5
Data6
Data7
Data read/write
6
Data8
Data9
Data10
Data11
Data read/write
7
Data12
Data13
Data14
Data15
Data read/write
8
Data16
Data17
Data18
Data19
Data read/write
9
Data20
Data21
Data22
Data23
Data read/write
10
Data24
Data25
Data26
Data27
Data read/write
11
Data28
Data29
Data30
Data31
Data read/write
12
Data32
Data33
Data34
Data35
Data read/write
13
Data36
Data37
Data38
Data39
Data read/write
14
Data40
Data41
Data42
Data43
Data read/write
15
Data44
Data45
Data46
Data47
Data read/write
(1) Pages 0 and 1 contain information such as the serial number of the card and are only readable. The check digits are calculated according to ISO/IEC 14443-3 as follows:
BCC0=CT⊕SN0⊕SN1⊕SN2
BCC1=SN3⊕SN4⊕SN5⊕SN6
(2) Page 2 is LOCK BYTES. Setting the bits corresponding to Byte 2 and Byte 3 can be individually locked from the 3rd page to the 15th page as a read-only area.
Lock0
L
7
L
6
L
5
L
4
L
OTP
BL
15-10
BL
9-4
BL
OTP
Lock1
L
15
L
14
L
13
L
12
L
11
L
10
L
9
L
8
Lx locks X pages as read only
BLX locks the corresponding Lx bit
Note: Once the block-locking (BLX) bit is set to the locked configuration, the corresponding memory area will be frozen. For example, if BL15-10 is set to 1, then L15 to L10 can no longer be changed.
Lock0 and Lock1 can be set by a write command, and the written content is bit or operated with the current content to obtain new content, and the initial value is 0. This process is irreversible. If a bit is set to 1, it can no longer be set to 0.
(3) Page 3 is OTP, which is one-time programming, and the initial value is 0. It is possible to change its value by writing a command, and the written value and the current value are bitwise ORed to obtain a new value. This process is irreversible. If a bit is set to 1, it will no longer be set to 0.
Note: This memory area can be used as a one-time counter with a maximum of 32.
(4) Pages 4 to 15 are the user read/write areas with an initial value of 0.
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