AN3408 Datasheet, PDF (15/38 Pages) STMicroelectronics – The NFC technology allows accessing standard

AN3408
Storing an NDEF message in STMicroelectronics ISO15693 products
3
Storing an NDEF message in STMicroelectronics
ISO15693 products
3.1
Memory organization of LRI1K, LRI2K and LRIS2K
The storage of a generic NDEF message in LRI1K, LRI2K and LRIS2K products is
described in Table 19. It also includes CC field value.
Table 19. Storing an NDEF message in LRI1K, LRI2K and LRIS2K ⁽¹⁾
RF block address Bits [31:24]
Bits [23:16]
Bits [15:8]
Bits [7:0]
0
CC0
CC1
CC2
CC3
1
NDEF Data 0
NDEF Data 1
NDEF Data 2
NDEF Data 3
2
NDEF Data 4
...
...
...
n ⁽²⁾
...
1. The UID field in system area is defined and written by STMicroelectronics and is write-protected.
2. n = 31 for LRI1K, n = 63 for LRI2K and LRIS2K.
3.2
3.2.1
Memory organization of LRIS64K and M24LRxx devices
User memory mapping is divided in 64 sectors. A sector size is 128 bytes.
Table 20. Storing an NDEF message in LRIS64K and M24LRxx
Sector
Area
Sector security status
0
1 kbit EEPROM sector
5 bits
1
1 kbit EEPROM sector
5 bits
2
1 kbit EEPROM sector
5 bits
3
1 kbit EEPROM sector
5 bits
...
n ⁽¹⁾
1 kbit EEPROM sector
5 bits
1. n = 3 for M24LR04-R, n = 15 for M24LR16-R and n = 64 for M24LR64X-R.
Description of the first sector
The NDEF message is located in the first sector, as shown in Table 21.
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