M24LR04E-RDW6T/2 STMicroelectronics, M24LR04E-RDW6T/2 Datasheet - Page 24

• Manufacturer Part Number: M24LR04E-RDW6T/2
• Description: EEPROM 4-Kbit Dual EEPROM 1.8 to 5.5V 13.56Mhz
• Manufacturer: STMicroelectronics

Specifications of M24LR04E-RDW6T/2

• Product Category: EEPROM
• Memory Size: 4 Kbit
• Maximum Clock Frequency: 400 KHz
• Maximum Operating Current: 20 uA
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-8
• Factory Pack Quantity: 1

System memory area
24/142
Table 9.
The M24LR04E-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:
Add
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
command. The sector lock bit, b
command, the protection settings of the selected sector are activated. The protection of
a locked block cannot be changed in RF mode. A Lock-sector command sent to a
locked sector returns an error code.
b
4
00
01
10
11
, b
3
Password control bits
Password system area
4
to b
1
of the sector security status byte are affected by the Lock-sector
Table
Doc ID 022208 Rev 5
10.
The sector is not protected by a password.
0
The sector is protected by password 1.
The sector is protected by password 2.
The sector is protected by password 3.
, is set to 1 automatically. After issuing a Lock-sector
Password 1
Password 2
Password 3
Password
M24LR04E-R