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SRI512 датащи(PDF) 12 Page - STMicroelectronics

номер детали SRI512
подробное описание детали  13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions
PDF  47 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SRI512 датащи(HTML) 12 Page - STMicroelectronics

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Data transfer
SRI512
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3.2.3
Answer end of frame
The EOF shown in Figure 9 is composed of:
●
followed by 10 ETUs at logic-0,
●
followed by 2 ETUs at logic-1.
Figure 9.
Answer end of frame
3.3
Transmission frame
Between the request data transfer and the answer data transfer, all ASK and BPSK
modulations are suspended for a minimum time of t0 = 128/ƒS. This delay allows the reader
to switch from Transmission to Reception mode. It is repeated after each frame. After t0, the
13.56 MHz carrier frequency is modulated by the SRI512 at 847 kHz for a period of
t1 =128/ƒS to allow the reader to synchronize. After t1, the first phase transition generated
by the SRI512 forms the start bit (‘0’) of the answer SOF. After the falling edge of the answer
EOF, the reader waits a minimum time, t2, before sending a new request frame to the
SRI512.
Figure 10.
Example of a complete transmission frame
ai07665
ETU
b0
b1
b2
b3
b4
b5
b6
b7
b8
b9
b10
b11
0000000000
11
12 bits
10 bits
Sync
128/fs
128/fs
fs=847.5kHz
t
DR
t
0
t
1
SOF
Cmd
Data
CRC
CRC
EOF
10 bits
10 bits
10 bits
10 bits
12 bits
10 bits
10 bits
10 bits
Data CRC CRC
SOF
EOF
12 bits
SOF
t
2
Ai10798
Input data transfer using ASK
Output data transfer using BPSK
Sent by the
Reader
Sent by the
SRI512
at 106kb/s



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