Storing an NDEF message in STMicroelectronics ISO15693 products

AN3408

16/38

DocID018867 Rev 4

3.3

CC2 value

The CC2 byte defines the IC memory size available for a user application. It includes a CC

field and a User memory area. CC2 value = IC memory size in bytes / 8.

Table 21. First sector details on M24LR64-R

Sector

RF block

address

I2C block

address

Bits [31:24]

Bits [23:16]

Bits [15:8]

Bits [7:0]

0

0

0

CC0

CC1

CC2

CC3

1

4

Data 0

Data 1

Data 2

Data 3

2

8

Data 4

...

...

...

...

31

124

...

Table 22. CC2 value for ISO/IEC 15693 products

Product

LRI1K

LRI2K

LRIS2K

LRIS64K

M24LR64X

M24LR16E-R M24LR04E-R

Memory size

128 bytes

(1024 bits)

256 bytes

(2048 bits)

256 bytes

(2048 bits)

8192 bytes

(64 kbits)

8192 bytes

(64 kbits)

256 bytes

(2048 bits)

64 bytes

(512 bits)

CC2 value

(1)

16 = 0x10

32 = 0x20

32 = 0x20

0xFF (2)

0xFF (2)

0x40

1.

CC2 value is equal to memory size in bytes divided by 8. The value is expressed in hexadecimal.

2.

If the contactless tag memory size exceeds the CC2 field (CC2 overflow), bit 2 of CC3 shall be set.

CC2 = 8192 / 8 = 1024d = 0x400. 0x400 value exceed 8 bits, thus CC2 of M24LR64-R is set to 0xFF (2040 bytes).