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OM25180FDKM Datasheet(PDF) 55 Page - NXP Semiconductors |
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OM25180FDKM Datasheet(HTML) 55 Page - NXP Semiconductors |
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55 / 149 page  PN5180 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 3.0 — 7 October 2016 240930 55 of 149 NXP Semiconductors PN5180 High-performance multi-protocol full NFC Forum-compliant frontend There are 4 different cases possible for a reception: 1. Correct reception - Data integrity is correct (no CRC error), and additionally the number of bytes received is equal to the length byte. Data is written to the buffer. No error set in status byte. 2. Erroneous reception - Data is incorrect (data integrity error - CRC wrong) but frame length is correct. Data is written to buffer and the bits CLError and DataError in the status byte are set. 3. Erroneous reception - the length byte received indicates a frame length greater than 28. No data is copied to buffer but status byte with LenError bit set is written. 4. Erroneous reception - the length byte is larger than the number of data bytes, which have been received. Data received is written to buffer and the ProtocolError bit in the status byte is set. For each reception, the RX_IRQ in the IRQ_STATUS_REG is set. The host firmware can disable the IRQ and use a timer for timeout after the last timeslot to avoid excessive interaction with the hardware. At the end of the reception, additionally the bit field RX_NUM_FRAMES_RECEIVED in the register RX_STATUS_REG is updated to indicate the number of received frames. After the reception of the eight frames (which is the maximum supported), a state change to next expected state is executed (WaitTransmit for transceive command). It is possible to issue the IDLE command in order to leave the RxMultiple cycle. Consequently the reception is stopped. Upon start of a new reception cycle, the flag RX_NUM_FRAMES_RECEIVED is cleared. The duration between deactivate and reactivate is at minimum 2 RF cycles and can last typically up to 2 s. 11.8.1.4 ISO/IEC15693 functionality The physical parameters are described below. Table 55. Communication for ISO/IEC 15693 reader/writer “reader to card” Communication direction Signal type Transfer speed fc/512 kbit/s Reader to card (send data from the PN5180 to a card) reader side modulation 10 % to 30 % ASK 90 % to 100 % ASK bit encoding 1/4 bit length 302.08 s |
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