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參數(shù)資料
| 型號(hào)： | TK5561A-PP |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | READ/WRITE CRYPTO TRANSPONDER FOR SHORT CYCLE TIME |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PXMA |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 252K |
| 代理商： | TK5561A-PP |
7
TK5561A-PP
4682A–RFID–02/03
Writing Data into the
TK5561A-PP
A write sequence of the TK5561A-PP is shown in Figure 7. Writing data into the tran-
sponder occurs by interrupting the RF field with short gaps. After the start gap the write
op-code (10) is transmitted. The next 32 bits contain the actual data. The last 4 bits
denote the destination block address. If the correct number of bits have been received,
the actual data is programmed into the specified memory block.
Figure 7.
Write Protocol to Program the EEPROM
Writing Data
Decoding
The time elapsing between two detected gaps is used to encode the information. As
soon as a gap is detected, a counter starts counting the number of field clock cycles
until the next gap is detected. Depending on how many field clocks elapse, the data is
regarded as 0 or 1. The required number of field clocks is shown in Figure 8. A valid 0 is
assumed if the number of counted clock periods is between 16 and 31, for a valid 1 it is
48 or 63 respectively. Any other value being detected results in an error and the device
exits write mode and returns to read mode.
Figure 8.
Write Data Decoding Scheme
Actual Device
Behavior
The TK5561A-PP detects a gap if the voltage across the coils decreases below a peak-
to-peak value of about 800 mV. Until then, the clock pulses are counted. The number
given for a valid 0 or 1 (see Figure 8) refers to the actual clock pulses counted by the
device. However, there are always more clock pulses being counted than were applied
by the base station. The reason for this is the fact that an RF field cannot be switched off
immediately. The coil voltage decreases exponentially. So although the RF field coming
from the base station is switched off, it takes some time until the voltage across the coils
reaches the threshold peak-to-peak value of about 800 mV and the device detects the
gap. Referring to the following diagram Figure 9, this means that the device uses the
times t
0
internal and t
1
internal. The exact times for t
0
and t
1
are dependent on the appli-
cation (e.g., field strength, etc.)
Typical time frames are:
t
0
= 60 to 140 μs
t
1
= 300 to 400 μs
t
gap
= 150 to 400 μs
Antennas with a high Q-factor require longer times for t
gap
and shorter time values for t
0
and t
1
.
1
Standard op-code
Address bits (e.g. block 2)
0
Read mode
Write mode
Start gap
> 64 clocks
1
0
0
32 bit
RF field
0
1
16
32
Field clock cycles
48
64
fail
0
fail
1
writing done
Write data decoder
EOT
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