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| 型号： | E5561 |
| 英文描述： | e5561 Advance Information [Updated 4/03. 26 Pages] Read/Write transponder IC for contactless RF identification for highly sophisticated security applications. |
| 中文描述： | e5561推进信息[更新4 / 03。 26页]读/写非接触式射频转发器的高度复杂的安全应用识别芯片。 |
| 文件页数： | 5/26页 |
| 文件大小： | 410K |
| 代理商： | E5561 |
13
e5561
4699A–RFID–04/03
Data Transmission to the
e5561 (Write)
Data transmission from the base station to the e5561 is carried out by using Atmel’s
write method. It is based on interrupting the RF field with short gaps. The number of field
clock cycles (FC) of two consecutive gaps encodes the 0/1 bit-information to be
transmitted.
Start Gap
The first gap is the start gap which triggers writing. During writing the damping is perma-
nently enabled which simplifies gap detection. The start gap has to be longer than the
subsequent gaps in order to be reliably detected. By default, a start gap will be detected
at any time after start-up intialization has been finished (field-on plus approximately
2ms).
Figure 14. Signals to the Transponder During Writing
Bit Decoder
The duration of the gaps is usually 50 s to 150 s. The time between two gaps is nom-
inally 24 field clocks for a 0 and 56 field clocks for a 1. The bit will be interpreted as 0 if
there are 16 to 32 field clocks since the last field gap; it will be interpreted as 1 if the
number of field clock cycles is in a range of 48 to 64. When there is no gap for more than
64 field clocks, writing is carried out (EOT). If there is a wrong number of field clocks
between two gaps – i.e., one or more data sent were not a valid 0 or 1 – the e5561 will
detect an error (see section “Error handling”).
Figure 15. Bit Decoding Scheme (Number of FCs Between Two Consecutive Gaps)
OPcodes
The OPcode is defined as the first two bits of a writing sequence. It is used for changing
the operational modes of the e5561. There are three valid OPcodes: The programming
mode and direct-access mode are entered with the 10 OP code, 01 is used to initiate the
authentication of the e5561, and the OPcode '00' disables modulation until a POR
occurs.
RF_Field
Gap
Field clock
1
0
Start
1
10
>64 FCs = EOT
reading
writing
1
16
32
48
64
fail
0
fail
1
EOT
Bit decoder
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