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參數(shù)資料
| 型號： | T555715M01-TAS |
| 廠商： | Atmel Corp. |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | 連接器附件 |
| 文件頁數(shù)： | 7/30頁 |
| 文件大?。?/td> | 711K |
| 代理商： | T555715M01-TAS |
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7
T5557
4517E–RFID–02/03
The sequence terminator may be individually enabled by setting of mode bit 29
(ST = ‘1’) in the e5550-compatibility mode (X-mode = ‘0’).
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).
Figure 7.
Read Data Stream with Sequence Terminator
Figure 8.
e5550-compatible Sequence Terminator Waveforms
Reader to Tag
Communication
Data is written to the tag by interrupting the RF field with short field gaps (on-off keying)
in accordance 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 execu-
tion 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.
Start Gap
The initial gap is referred to as the start gap. This triggers the reader to tag communica-
tion. During 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.
Block 1
Block 2
Block 1
Block 2
Block 1
Block 2
MAXBLK
Block 1
Block 2
No terminator
ST = on
Sequence terminator
Sequence terminator
Regular read mode
Last bit
First Bit
Manchester
Bit period
Modulation
off (on)
Data '1'
Data '1'
Modulation
off (on)
bit '1' or '0'
FSK
Sequence
Waveforms per different modulation types
V
Coil
PP
Data '1'
Data '1'
Sequence terminator not suitable for Biphase or PSK modulation
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