SRI4K-SBN181GE STMICROELECTRONICS [STMicroelectronics], SRI4K-SBN181GE Datasheet - Page 12

• Manufacturer Part Number: SRI4K-SBN181GE
• Description: 13.56 MHz short-range contactless memory chip with 4096-bit EEPROM and anticollision functions
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Data transfer
3.2.3
Figure 9.
3.3
Figure 10. Example of a complete transmission frame
12/45
Sent by the
Sent by the
Reader
SRI4K
ETU
Answer end of frame
The EOF shown in
●
●
Answer end of frame
Transmission frame
Between the request data transfer and the answer data transfer, all ASK and BPSK
modulations are suspended for a minimum time of t
to switch from Transmission to Reception mode. It is repeated after each frame. After t
13.5 6MHz carrier frequency is modulated by the SRI4K at 847 kHz for a period of t
128/ƒ
SRI4K forms the start bit (‘0’) of the answer SOF. After the falling edge of the answer EOF,
the reader waits a minimum time, t
SOF
at 106kb/s
12 bits
followed by 10 ETUs at logic-0,
followed by 2 ETUs at logic-1.
S
0
b0
to allow the reader to synchronize. After t
Cmd
Input data transfer using ASK
10 bits
0
b1
Data
10 bits
t
DR
0
b2
Figure 9
CRC
10 bits
0
b3
CRC
10 bits
is composed of:
0
b4
EOF
10 bits
2
, before sending a new request frame to the SRI4K.
0
b5
128/fs
t
0
b6
0
f s =847.5kHz
Sync
128/fs
1
t
1
, the first phase transition generated by the
0
b7
Output data transfer using BPSK
0
= 128/ƒ
SOF
12 bits
0
b8
Data CRC CRC
10 bits
S
. This delay allows the reader
0
b9
10 bits
1
b10
10 bits
EOF
t
12 bits
1
b11
2
AI10882
SOF
ai07665
1
SRI4K
=
0
, the