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ST25R200 数据表(PDF) 22 Page - STMicroelectronics

部件名 ST25R200
功能描述  NFC/HF RFID reader IC
PDF  88 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST25R200 数据表(HTML) 22 Page - STMicroelectronics

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Figure 17. Transceiver operation with timeout
RF field
Data
Tx data
NRT
MRT
Receiver
I_txe
Interrupts
I_nre
MS71324
Figure 18. Transceiver operation with nrt_emd=0
RF field
Data
Tx data
Rx data
NRT
MRT
Receiver
I_txe
I_rxs
I_rxe
Interrupts
.
.
.
MS71325
Figure 19. Transceiver operation with nrt_emd=1
RF field
Data
Tx data
Rx data
NRT
MRT
Receiver
I_txe
I_rxs
I_rxe
Interrupts
I_nre
MS71326
5.10.1
ISO 14443A/NFC-A short frames
ISO14443A/NFC-A short frames (REQA/SENS_REQ and WUPA/ALL_REQ) are transmitted in the same manner
via the FIFO. The number of data to be sent shall be defined to zero bytes and seven bits. As the response to
these requests (ATQA/SENS_RES), does not contain CRC, the bit rx_crc shall be cleared.
5.10.2
Bit-oriented anticollision
In order to receive bit-oriented anticollision frames, the bit antcl has to be set.
For ISO14443A/NFC_A bit oriented anticollision, the bit rx_nbtx shall be set so that nbtx<2:0> define the position
of the first bit in the first byte in consecutive reception.
Bit-oriented anticollision can be performed for both ISO14443A/NFC-A and ISO15693/NFC-V. When bit antcl is
set:
•
Level coll_lvl is used to detect colliding bits
•
Detected collision is signaled via IRQ with the flag I_col
ST25R200
Application information
DS13658 - Rev 2
page 22/88



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