T555711-DDW Atmel, T555711-DDW Datasheet - Page 9

• Manufacturer Part Number: T555711-DDW
• Description: IC IDIC R/W RFID 330BIT ON-CHIP
• Manufacturer: Atmel
• Series: T555711r

Specifications of T555711-DDW

• Rf Type: Read / Write
• Frequency: 125kHz
• Features: 330-bit EEPROM
• Package / Case: DICE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4.8
4517J–RFID–03/06
Write Data Protocol
Figure 4-4.
Table 4-1.
The T5557 expects to receive a dual bit opcode as the first two bits of a reader command
sequence. There are three valid opcodes:
Writing has to follow these rules:
Note:
If the transmitted command sequence is invalid, the T5557 enters regular-read mode with the
previously selected page (by former opcode “10” or “11”).
Parameters
Start gap
Write gap
Write data in normal mode
• The opcodes “10” and “11” precede all block write and direct access operations for page 0
• The RESET opcode “00” initiates a POR cycle
• The opcode “01” precedes all test mode write operations. Any test mode access is ignored
• Standard write needs the opcode, the lock bit, 32 data bits and the 3-bit address (38 bits
• Protected write (PWD bit set) requires a valid 32-bit password between opcode and data,
• For the AOR wake-up command an opcode and a valid password are necessary to select
and page 1
after master key (bits 1 to 4) in block 0 has been set to “6”. Any further modifications of the
master key are prohibited by setting the lock bit of block 0 or the OTP bit.
total)
address bits
and activate a specific tag
The data bits are read in the same order as written.
Start of Reader to Tag Communication
Write Data Decoding Scheme
Normal write mode
Read mode
Remark
“0” data
“1” data
S
gap
Symbol
d
1
W
S
Write mode
d
d
gap
gap
0
1
W
gap
d
Min.
10
16
48
n
8
Max.
50
30
31
63
T5557
Unit
FC
FC
FC
FC
9