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SRI4K bảng dữ liệu(PDF) 12 Page - STMicroelectronics

tên linh kiện SRI4K
Giải thích chi tiết về linh kiện  13.56 MHz short-range contactless memory chip with 4096-bit EEPROM and anticollision functions
PDF  45 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SRI4K bảng dữ liệu(HTML) 12 Page - STMicroelectronics

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Data transfer
SRI4K
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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
13.5 6MHz carrier frequency is modulated by the SRI4K 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
SRI4K 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 SRI4K.
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
AI10882
Input data transfer using ASK
Output data transfer using BPSK
Sent by the
Reader
Sent by the
SRI4K
at 106kb/s



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