T555714-DBW Atmel, T555714-DBW Datasheet - Page 8

• Manufacturer Part Number: T555714-DBW
• Description: MODULE IDIC R/W RFID 33OPF
• Manufacturer: Atmel
• Series: T555714r

Specifications of T555714-DBW

• Rf Type: Read / Write
• Frequency: 125kHz
• Features: 330-bit EEPROM
• Package / Case: DICE
• Screening Level: Industrial
• Package Type: Die
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 4-2.
Figure 4-3.
4.6
4.7
8
Sequence terminator not suitable for Biphase or PSK modulation
Reader to Tag Communication
Start Gap
Sequence
Waveforms per different modulation types
Manchester
FSK
T5557
No terminator
ST = on
Regular read mode
Read Data Stream with Sequence Terminator
e5550-compatible Sequence Terminator Waveforms
In the regular-read mode, the sequence terminator is inserted at the start of each
MAXBLK-limited read data stream.
In block-read mode – after any block-write or direct access command – or if MAXBLK was set to
0 or 1, the sequence terminator is inserted before the transmission of the selected block.
Especially this behavior is different to former e5550-compatible ICs (T5551, T5554).
Data is written to the tag by interrupting the RF field with short field gaps (on-off keying) in accor-
dance with the e5550 write method. The time between two gaps encodes the “0/1” information to
be transmitted (pulse interval encoding). The duration of the gaps is usually 50 µs to 150 µs. The
time between two gaps is nominally 24 field clocks for a “0” and 54 field clocks for a “1”. When
there is no gap for more than 64 field clocks after a previous gap, the T5557 exits the write
mode. The tag starts with the command execution if the correct number of bits were received. If
there is a failure detected the T5557 does not continue and will enter regular-read mode.
The initial gap is referred to as the start gap. This triggers the reader to tag communication. Dur-
ing this mode of operation, the receive damping is permanently enabled to ease gap detection.
The start gap may need to be longer than subsequent gaps in order to be detected reliably.
A start gap will be accepted at any time after the mode register has been loaded (≥ 3 ms). A sin-
gle gap will not change the previously selected page (by former opcode “10” or “11”).
Sequence terminator
Block 1
Bit period
V
Last bit
CoilPP
Block 1
Block 2
Data 1
Block 2
MAXBLK
Modulation
Data 1
off (on)
MAXBLK
Sequence terminator
Block 1
Data 1
Block 1
Modulation
Block 2
Data 1
off (on)
Block 2
bit 1 or 0
First Bit
4517J–RFID–03/06