M24SR04-Y Datasheet, PDF (23/90 Pages) STMicroelectronics – Support of NDEF data structure

M24SR04-Y M24SR04-G
M24SR04 memory management
File offset
0x0000
0x0004
...
...
...
0x01FC
Table 5. NDEF file layout
Byte 0
Byte 1
NDEF message length
User data
...
...
...
User data
...
...
...
...
...
Byte 2
User data
User data
...
...
...
...
Byte 3
User data
User data
...
...
...
User data
3.1.4
System file layout
The system file specifies the configuration of the M24SR04. Table 6 lists the different fields.
Table 6. Field list
File offset
Field name
Number of
bytes
Read access
Write access
Delivery state ⁽¹⁾
0x0000
Length system file
2
0x0002
I²C protect
1
0x0003
I²C watchdog
1
0x0004
GPO
1
0x0005
ST reserved
1
0x0006
RF enable
1
0x0007
NDEF File
number (RFU)
1
0x0008
UID
7
0x000F
Memory Size
2
0x0011
Product Code
1
I²C or RF
I²C or RF
I²C or RF
I²C or RF
I²C or RF
I²C or RF
I²C or RF
I²C or RF
I²C or RF
I²C or RF
-
I²C ⁽²⁾
I²C ⁽²⁾
I²C ⁽²⁾
I²C ⁽²⁾
I²C ⁽²⁾
none
none
none
none
0x0012
0x01
0x00
0x11
0x00
0x xxxx xxx1⁽³⁾
0x00
0x0286 xx xx xx xx
xxor 0x028E xx xx xx
xx xx^{(4) (5)}
0x01FF
0x86 or 0x8E⁽⁵⁾
1. The delivery state for all passwords = 0x00000000000000000000000000000000.
2. The access is granted when the field I²C protect is set to the state Unprotected or when the right I²C
password was correctly received (see Section 3.5: I2C password).
3. Refer Table 11.
4. x values are defined by ST to insure UID unicity.
5. Automotive grade
DocID024754 Rev 15
23/90
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