SR176 Datasheet, PDF (3/5 Pages) STMicroelectronics – 13.56 MHz Short Range Contactless Memory Chip 176 bit USER EEPROM and 64-bit Unique ID

SR176
MEMORY MAPPING
The SR176 is organized as 16 blocks of 16 bits, as
shown in Figure 3.
The first four blocks, from location 0 to 3, are used
to store read-only data. They store the 64-bit UID.
This value cannot be modified.
Blocks from locations 4 to 14 offer a 176-bit EE-
PROM user area in which the application can store
its data values. Block 15 contains the OTP
LOCK_REG and the programmed Chip_ID.
The PROTECT_BLOCK command is used to lock
write access to blocks 4 to 15 by a group of 2
blocks.
The GET_PROTECTION command gives the sta-
tus of the protection of blocks 4 to 15.
Figure 3. SR176 Memory Mapping
Block MSb
Address _b15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16-bit block
b8 b7
UID0
UID1
UID2
UID3
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
OTP LOCK_REG
LSb
Description
b0
64-bit UID
ROM
Lockable EEPROM
Lockable EEPROM
Lockable EEPROM
Lockable EEPROM
Lockable EEPROM
Reserved Chip_ID
Lockable EEPROM
ai07699
3/5