T555401N-DDW Atmel, T555401N-DDW Datasheet - Page 5

• Manufacturer Part Number: T555401N-DDW
• Manufacturer: Atmel

Specifications of T555401N-DDW

• Screening Level: Industrial
• Lead Free Status / Rohs Status: Supplier Unconfirmed

3.11
4576D–RFID–12/06
Memory
The memory of the T5554 is a 264-bit EEPROM, which is arranged in 8 blocks of 33 bits each.
All 33 bits of a block, including the lock bit, are programmed simultaneously. The programming
voltage is generated on-chip.
Block 0 contains the mode data, which are not normally transmitted (see
Blocks 1 to 6 are freely programmable. Block 7 may be used as a password. If password protec-
tion is not required, it may be used for user data.
Bit 0 of every block is the lock bit for that block. Once locked, the block (including the lockbit
itself) cannot be field-reprogrammed.
Data from the memory is transmitted serially, starting with block 1, bit 1, up to block “MAXBLK”,
bit 32. “MAXBLK” is a mode parameter set by the user to a value between 0 and 7 (if maxblk = 0,
only block 0 will be transmitted).
Figure 3-3.
Memory Map
0
L
L
L
L
L
L
L
L
Not transmitted
1
User data or password
User data
User data
User data
User data
User data
User data
Configuration data
32 bits
32
Block 7
Block 6
Block 5
Block 4
Block 3
Block 2
Block 1
Block 0
Figure
3-3).
T5554
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