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OM25180FDKM Datasheet(PDF) 17 Page - NXP Semiconductors |
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OM25180FDKM Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 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 17 of 149 NXP Semiconductors PN5180 High-performance multi-protocol full NFC Forum-compliant frontend Remark: To send more bytes in one data stream, the NSS signal must be LOW during the send process. To send more than one data stream, the NSS signal must be HIGH between each data stream. Any data available to be read from the SPI interface is indicated by the BUSY signal de-asserted. 11.4.3 Logical Host Interface 11.4.3.1 Host Interface Command A Host Interface Command consists of either 1 or 2 SPI frames depending whether the host wants to write or read data from the PN5180. An SPI Frame consists of multiple bytes. The protocol used between the host and the PN5180 uses 1 byte indicating the instruction code and additional bytes for the payload (instruction-specific data). The actual payload size depends on the instruction used. The minimum length of the payload is 1 byte. This provides a constant offset at which message data begins. All commands are packed into one SPI Frame. An SPI Frame consists of multiple bytes. No NSS toggles allowed during sending of an SPI frame. For all 4 byte command parameter transfers (e.g. register values), the payload parameters passed follow the little endian approach (Least Significant Byte first). Fig 9. Connection to host with SPI aaa-016093 tSCKL tNSSH tSCKH tSCKL tsu(D-SCKH) th(SCKH-D) th(SCKL-Q) t(SCKL-NSSH) SCK MOSI MISO MSB MSB LSB LSB NSS Fig 10. Instruction Payload aaa-023432 lnstruction Payload 1 Payload N Byte 1 Byte 2 Byte N - Size of payload depends on Instruction - Minimum payload is 1 byte ...... |
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