參數(shù)資料
型號(hào): E5551A-DOW
英文描述: Transponder
中文描述: 轉(zhuǎn)發(fā)
文件頁(yè)數(shù): 2/21頁(yè)
文件大?。?/td> 157K
代理商: E5551A-DOW
e5551
Rev. A2, 19-Apr-00
10 (21)
RF_Field
Gap
Write data
Field clock
1
0
Start
1
10
Damping
Write mode
Data Clock
Load On
Load Off
>64 FCs = stop write
Programming Read mode
Read mode
Writing
Modulation during read mode
Figure 15. Signals during writing
Write data decoder
1
1632
4864
fail
0
fail
1
writing done
Figure 16. Write data decoding schemes
OP
2
Addr
0
OP
11
Password mode
AOR (wake-up command)
Standard write
Stop command
OP
L
OP
10
1
Data bits
32
1
Password
32
1
Password
32
OP
L
10
Direct access
2
Addr
0
2
Addr
0
1
Data bits
32
Figure 17. e5551 – OP-code formats
Write
Writing data into the IC occurs via the TEMIC write
method. It is based on interrupting the RF field with short
gaps. The time between two gaps encodes the ‘0/1’
information to be transmitted.
Start Gap
The first gap is the start gap which triggers write mode.
In write mode, the damping is permanently enabled
which eases gap detection. The start gap may need to be
longer than subsequent gaps in order to be detected
reliably.
A start gap will be detected at any time after block 0 has
been read (field-on plus approximately 2 ms).
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