M24LR64E-RDW6T/2 STMicroelectronics, M24LR64E-RDW6T/2 Datasheet - Page 25

• Manufacturer Part Number: M24LR64E-RDW6T/2
• Description: EEPROM 64Kbit EEProm 400kHz 13.56Mhz 1.8 to 5.5V
• Manufacturer: STMicroelectronics

Specifications of M24LR64E-RDW6T/2

• Rohs: yes
• Memory Size: 64 Kbit
• Organization: 8192 x 8
• Data Retention: 40 yr
• Maximum Clock Frequency: 400 kHz
• Maximum Operating Current: 20 uA
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 90 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-8
• Access Time: 900 ns
• Interface Type: I2C
• Minimum Operating Temperature: 0 C
• Operating Current: 20 uA
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 1.8 V

M24LR64E-R
When the Sector Lock bit is set to 1, for instance by issuing a Lock-sector command, the two
Read/Write protection bits (b
described in
Table 8.
The next two bits of the Sector security status byte (b
The value of these two bits is used to link a password to the sector, as defined in
Table 9.
The M24LR64E-R password protection is organized around a dedicated set of commands,
plus a system area of three password blocks where the password values are stored. This
system area is described in
Table 10.
The dedicated commands for protection in RF mode are:
Sector
Add
Lock
1
2
3
Write-sector password:
The Write-sector password command is used to write a 32-bit block into the password
system area. This command must be used to update password values. After the write
cycle, the new password value is automatically activated. It is possible to modify a
password value after issuing a valid Present-sector password command. On delivery,
the three default password values are set to 0000 0000h and are activated.
Lock-sector:
The Lock-sector command is used to set the sector security status byte of the selected
sector. Bits b
0
1
1
1
1
b
4
00
01
10
11
, b
3
Table
Read/Write protection bit setting
Password control bits
Password system area
b
2
00
01
10
11
xx
, b
4
1
8.
to b
1
when password presented
of the sector security status byte are affected by the Lock-sector
Read
Read
Read
Read
Read
Table
1
Doc ID 022712 Rev 3
, b
Sector access
2
) are used to set the Read/Write access of the sector as
10.
The sector is not protected by a password.
The sector is protected by password 1.
The sector is protected by password 2.
The sector is protected by password 3.
No Write
Write
Write
Write
Write
Password 1
Password 2
Password 3
Password
3
, b
4
) are the password control bits.
when password not presented
No Read
No Read
Read
Read
Read
Sector access
System memory area
No Write
No Write
No Write
Write
Write
Table
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9.