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SRI512-SBN18/1GE

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47
Data transfer SRI512
10/47 Doc ID 13263 Rev 5
3.1.2 Request start of frame
The SOF described in Figure 5 is composed of:
● one falling edge,
● followed by 10 ETUs at logic-0,
● followed by a single rising edge,
● followed by at least 2 ETUs (and at most 3) at logic-1.
Figure 5. Request start of frame
3.1.3 Request end of frame
The EOF shown in Figure 6 is composed of:
● one falling edge,
● followed by 10 ETUs at logic-0,
● followed by a single rising edge.
Figure 6. Request end of frame
Table 2. Bit description
Bit Description Value
b
0
Start bit used to synchronize the transmission b
0
= 0
b
1
to
b
8
Information byte (command, address or data)
The information byte is sent with
the least significant bit first
b
9
Stop bit used to indicate the end of a character b
9
= 1
ai07665
ETU
b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11
000000000011
ai07666
ETU
b0 b1 b2 b3 b4 b5 b6 b7 b8 b9
0000000000
SRI512 Data transfer
Doc ID 13263 Rev 5 11/47
3.2 Output data transfer from the SRI512 to the reader (answer
frame)
The data bits issued by the SRI512 use back-scattering. Back-scattering is obtained by
modifying the SRI512 current consumption at the antenna (load modulation). The load
modulation causes a variation at the reader antenna by inductive coupling. With appropriate
detector circuitry, the reader is able to pick up information from the SRI512. To improve load-
modulation detection, data is transmitted using a BPSK encoded, 847 kHz subcarrier
frequency ƒ
s
as shown in Figure 7, and as specified in the ISO 14443-2 Type B Standard.
Figure 7. Wave transmitted using BPSK subcarrier modulation
3.2.1 Character transmission format for answer frame
The character format is the same as for input data transfer (Figure 4). The transmitted
frames are made up of an SOF, data, a CRC and an EOF (Figure 10). As with an input data
transfer, if an error occurs, the reader does not issue an error code to the SRI512, but it
should be able to detect it and manage the situation. The data transfer rate is
106 Kbits/second.
3.2.2 Answer start of frame
The SOF described in Figure 8 is composed of:
● followed by 10 ETUs at logic-0
● followed by 2 ETUs at logic-1
Figure 8. Answer start of frame
Or
AI10797
Data Bit to be Transmitted
to the Reader
847kHz BPSK Modulation
Generated by the SRI512
BPSK Modulation at 847kHz
During a One-bit Data Transfer Time (1/106kHz)
ai07665
ETU
b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11
000000000011
Data transfer SRI512
12/47 Doc ID 13263 Rev 5
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 t
0
= 128/ƒ
S
. This delay allows the reader
to switch from Transmission to Reception mode. It is repeated after each frame. After t
0
, the
13.56 MHz carrier frequency is modulated by the SRI512 at 847 kHz for a period of
t
1
=128/ƒ
S
to allow the reader to synchronize. After t
1
, 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, t
2
, 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
000000000011
12 bits
10 bits
Sync
128/fs
128/fs
f
s
=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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47

SRI512-SBN18/1GE

Mfr. #:
Buy SRI512-SBN18/1GE
Manufacturer:
STMicroelectronics
Description:
IC RFID TRANSP 13.56MHZ DIE
Lifecycle:
New from this manufacturer.
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