M24LR04E-RDW6T/2 STMicroelectronics, M24LR04E-RDW6T/2 Datasheet - Page 23

• 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

M24LR04E-R
4
4.1
System memory area
M24LR04E-R block security in RF mode
The M24LR04E-R provides a special protection mechanism based on passwords. In RF
mode, each memory sector of the M24LR04E-R can be individually protected by one out of
three available passwords, and each sector can also have Read/Write access conditions
set.
Each memory sector of the M24LR04E-R is assigned with a Sector security status byte
including a Sector Lock bit, two Password Control bits and two Read/Write protection bits,
as shown in
Table 6
using the Read Single Block and Read Multiple Block commands with the Option_flag set
to 1.
On delivery, the default value of the SSS bytes is set to 00h.
Table 6.
Table 7.
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
Sector
Lock
E2 = 1
b
0
0
1
1
1
1
7
I
2
C byte address
describes the organization of the Sector security status byte, which can be read
Table
Sector security status byte area
Sector security status byte organization
Table
Read / Write protection bit setting
b
2
00
01
10
11
xx
, b
b
0
6
1
7.
8.
0
when password presented
Read
Read
Read
Read
Read
b
0
5
1
Doc ID 022208 Rev 5
, b
Bits [31:24]
Sector access
2
SSS 3
) are used to set the Read/Write access of the sector as
Password control bits
b
4
No Write
Write
Write
Write
Write
Bits [23:16]
SSS 2
b
3
3
, b
4
) are the password control bits.
when password not presented
No Read
No Read
Read
Read
Read
b
protection bits
Read / Write
Bits [15:8]
2
SSS 1
Sector access
System memory area
b
1
No Write
No Write
No Write
Bits [7:0]
Write
Write
SSS 0
Table
Sector
Lock
b
23/142
0
9.