SRIX4K-SBN181GE STMICROELECTRONICS [STMicroelectronics], SRIX4K-SBN181GE Datasheet - Page 12

• Manufacturer Part Number: SRIX4K-SBN181GE
• Description: 13.56 MHz short-range contactless memory chip with 4096-bit EEPROM, anticollision and anti-clone functions
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Data transfer
3.2.3
3.3
Figure 10. Example of a complete transmission frame
12/47
Sent by the
Sent by the
SRIX4K
Reader
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 SRIX4K at 847 kHz for a period of
t
by the SRIX4K 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 SRIX4K.
1
= 128/ƒ
SOF
at 106kb/s
12 bits
followed by 10 ETUs at logic-0,
followed by 2 ETUs at logic-1.
ETU
S
Cmd
Input data transfer using ASK
10 bits
to allow the reader to synchronize. After t
0
Answer end of frame
b0
Data
10 bits
t
DR
0
b1
Figure 9
CRC
10 bits
0
b2
CRC
10 bits
is composed of:
0
b3
EOF
10 bits
0
b4
128/fs
t
0
0
b5
f s =847.5kHz
Sync
128/fs
2
t
1
, before sending a new request frame to
0
b6
Output data transfer using BPSK
0
1
= 128/ƒ
SOF
, the first phase transition generated
12 bits
b7
0
Data CRC CRC
10 bits
S
. This delay allows the reader
b8
0
10 bits
0
b9
10 bits
EOF
t
12 bits
1
b10
2
AI05731
ai07665
1
b11
SOF
SRIX4K
0
, the