SRI512-SBN18/1GE STMicroelectronics, SRI512-SBN18/1GE Datasheet - Page 19

• Manufacturer Part Number: SRI512-SBN18/1GE
• Description: IC MEM 13.56MHZ 512BIT EEPROM
• Manufacturer: STMicroelectronics
• Series: SRI512r

Specifications of SRI512-SBN18/1GE

• Rf Type: Read / Write
• Frequency: 13.56MHz
• Features: ISO14443-B
• Package / Case: Wafer
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SRI512
4.4
4.4.1
System area
This area is used to modify the settings of the SRI512. It contains 3 registers:
OTP_Lock_Reg, Fixed Chip_ID and ST Reserved. See
A Write_block command in this area will not erase the previous contents. Selected bits can
thus be set from 1 to 0. All bits previously at 0 remain unchanged. Once all the 32 bits of a
block are at 0, the block is empty and cannot be updated any more.
Figure 18. System area
OTP_Lock_Reg
The 16 bits, b31 to b16, of the System area (block address 255) are used as
OTP_Lock_Reg bits in the SRI512. They control the write access to the 16 blocks 0 to 15 as
follows:
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
The OTP_Lock_Reg bits cannot be erased. Once write-protected, the blocks behave like
ROM blocks and cannot be unprotected. After any modification of the OTP_Lock_Reg bits, it
is necessary to send a Select command with a valid Chip_ID to the SRI512 in order to load
the block write protection into the logic.
Block
Address
When b16 is at 0, block 0 is write-protected
When b17 is at 0, block 1 is write-protected
When b18 is at 0, block 2 is write-protected
When b19 is at 0, block 3 is write-protected
When b20 is at 0, block 4 is write-protected
When b21 is at 0, block 5 is write-protected
When b22 is at 0, block 6 is write-protected
When b23 is at 0, block 7 is write-protected
When b24 is at 0, block 8 is write-protected
When b25 is at 0, block 9 is write-protected
When b26 is at 0, block 10 is write-protected
When b27 is at 0, block 11 is write-protected
When b28 is at 0, block 12 is write-protected
When b29 is at 0, block 13 is write-protected
When b30 is at 0, block 14 is write-protected
When b31 is at 0, block 15 is write-protected.
255
b31
MSb
OTP_Lock_Reg
Doc ID 13263 Rev 5
b16 b15 b14
32-bit Block
0
ST Reserved
b8 b7
Figure 18
Fixed Chip_ID
(Option)
for a map of this area.
LSb
b0
Description
Memory mapping
OTP
ai12374b
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