SRT512-SBN18/1G2 STMICROELECTRONICS [STMicroelectronics], SRT512-SBN18/1G2 Datasheet - Page 12

• Manufacturer Part Number: SRT512-SBN18/1G2
• Description: 13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Data transfer
3.2.3
3.3
Figure 10. Example of a complete transmission frame
12/46
Sent by the
SRT512
Reader
Sent by
Answer end of frame
The EOF shown in
●
●
Figure 9.
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
13.56 MHz carrier frequency is modulated by the SRT512 at 847 kHz for a period of
t
by the SRT512 forms the start bit (‘0’) of the answer SOF. After the falling edge of the
answer EOF, the reader waits a minimum time, t
the SRT512.
1
= 128/ƒ
SOF
at 106kb/s
12 bits
followed by 10 ETUs at logic-0,
followed by 2 ETUs at logic-1.
ETU
Cmd
S
Input data transfer using ASK
10 bits
to allow the reader to synchronize. After t
Answer end of frame
0
b0
Data
10 bits
t
DR
Figure 9
0
b1
CRC
10 bits
0
b2
CRC
10 bits
is composed of:
Doc ID 13277 Rev 4
0
b3
EOF
10 bits
0
b4
128/fs
t
0
f s =847.5kHz
0
b5
128/fs
Sync
t
2
1
, before sending a new request frame to
Output data transfer using BPSK
0
b6
0
SOF
1
= 128/ƒ
12 bits
, the first phase transition generated
0
b7
Data CRC CRC
10 bits
S
. This delay allows the reader
0
b8
10 bits
10 bits
0
b9
EOF
t
12 bits
2
1
b10
Ai13506b
ai07665
SOF
1
b11
SRT512
0
, the