M24LR64-R memory organization

AN3171

12/14

Doc ID 17229 Rev 1

The RF passwords cannot be read (an I²C read operation to an RF password area sends

back FFh data) or written through the I²C bus.

The I²C password can be read only if an I²C Present Password sequence was previously

performed and the password matched. It is not possible to directly write the I²C password: to

be able to modify the I²C password, the I²C Write Password command has to be used.

DSFID, AFI, RFU, UID, MemSize and I²C Ref are read-only data and cannot be modified

from the I²C bus.

Table 5.

System parameter sector

RF address

Bits [31:24]

Bits [23:16]

Bits [15:8]

Bits [7:0]

-E2 = 1

2304

1

E2 = 1

2308

RF password 1 (default 0000 0000h)

2

E2 = 1

2312

RF password 2 (default 0000 0000h)

3

E2 = 1

2316

RF password 3 (default 0000 0000h)

-

E2 = 1

2320

DSFID (FFh)

AFI (00h)

RFU (FFh)

RFU (FFh)

-

E2 = 1

2324

UID

UID

UID

UID

-

E2 = 1

2328

UID (E0h)

UID (02h)

UID

UID

-

E2 = 1

2332

Mem_Size (03 07FFh)

IC Ref (2Ch)