M24LR64E-R datasheet(31/140 Pages) STMICROELECTRONICS

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M24LR64E-R

System memory area

Doc ID 022712 Rev 3

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power-on, all user memory sectors protected by the I2C_Write_Lock bits can be read but

cannot be modified. To remove the write protection, it is necessary to use the I2C present

password described in Figure 12. When the password is correctly presented — that is, when

all the presented bits correspond to the stored ones — it is also possible to modify the I2C

password using the I2C write password command described in Figure 13.

The next three 32-bit blocks store the three RF passwords. These passwords are neither

read- nor write- accessible in the I2C mode.

The next byte stores the Configuration byte, at I²C location 2320. This Control register is

used to store the three energy harvesting configuration bits and the RF WIP/BUSY

configuration bit.

The next two bytes are used to store the AFI, at I2C location 2322, and the DSFID, at I2C

location 2323. These two values are used during the RF inventory sequence. They are read-

only in the I2C mode.

The next eight bytes, starting from location 2324, store the 64-bit UID programmed by ST on

the production line. Bytes at I2C locations 2332 to 2335 store the IC Ref and the Mem_Size

data used by the RF Get_System_Info command. The UID, Mem_Size and IC ref values are

read-only data.

Table 17.

System parameter sector

I2C byte address

Bits [31:24]

Bits [23:16]

Bits [15:8]

Bits [7:0]

E2 = 1

2304

I2C password (1)

Delivery state: I2C password = 0000 0000h, RF password = 0000 0000h, Configuration byte = F4h

E2 = 1

2308

RF password 1(1)

E2 = 1

2312

RF password 2(1)

E2 = 1

2316

RF password 3 (1)

E2 = 1

2320

DSFID (FFh)

AFI (00h)

ST reserved

Configuration

byte (F4h)

E2 = 1

2324

UID

E2 = 1

2328

UID (E0h)

UID (02h)

UID

E2 = 1

2332

Mem_Size

(03 07FFh)

IC Ref (5Eh)

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