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NTP53X2 Datenblatt(PDF) 84 Page - NXP Semiconductors |
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NTP53X2 Datenblatt(HTML) 84 Page - NXP Semiconductors |
84 / 133 page NXP Semiconductors NTP53x2 NTAG 5 link - NFC Forum-compliant I2C bridge NTP53x2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. Product data sheet Rev. 3.3 — 3 July 2020 COMPANY PUBLIC 544533 84 / 133 Table 178. Inventory Read (extended mode) response format: Option_flag 1b Flags Optional truncated UID OR complete UID Optional data CRC16 8 bits 0 to 64 bits Block length 16 bits Multiple of 8 bits Repeated as needed The mechanism and timing of the INVENTORY READ command performs the same as at the INVENTORY command which is defined in ISO/IEC 15693. If the UID is requested in the truncated format the retransmitted UID can be calculated as follows: 16 slots: 64 - 4 - mask length rounded up to the next byte boundary 1 slot: 64 - mask length rounded up to the next byte boundary Example: mask length = 30 Returned: 64 - 4 - 30 = 30 gives 4 bytes Table 179. Example Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 UID mask value incl. padding with zeros transmitted by Interrogator returned value transmitted by NTAG 5 link 8.2.3.5.1.3 Addressed and SELECTED mode The INVENTORY READ command can also be transmitted in the addressed or SELECTED mode. In this case, the Inventory_flag is set to 0 and the meaning of flags 7 to 4 is in accordance with ISO/IEC 15693. In the addressed or selected mode, the INVENTORY READ command behaves similar to a READ or READ MULTIPLE BLOCK command. In the addressed mode, it is recommended to address the IC with a mask length of 64 and to transmit the complete UID in the mask value field. In the selected mode (IC has been selected with a valid SELECT command before), it is recommended to address the IC with a mask length of 0 (and do not transmit the mask value field). Remark: If the INVENTORY READ command is used in the addressed or selected mode, the AFI shall not be transmitted and the IC will only respond in the first-time slot. 8.2.3.5.2 FAST INVENTORY READ Command code = A1h When receiving the FAST INVENTORY READ command, NTAG 5 link behaves the same as the INVENTORY READ command with the following exceptions: The data rate in the direction NTAG 5 link to the reader is twice as defined in ISO/IEC 15693 depending on the Datarate_flag 53 kbit (high data rate) or 13 kbit (low data rate). The data rate from the reader to NTAG 5 link and the time between the rising edge of the EOF from the reader to NTAG 5 link remains unchanged (stays the same as defined in ISO/IEC 15693). |
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