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M24LR16E-R 数据表(PDF) 81 Page - STMicroelectronics |
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M24LR16E-R 数据表(HTML) 81 Page - STMicroelectronics |
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81 / 143 page  M24LR16E-R Command codes Doc ID 018932 Rev 8 81/143 26.1 Inventory When receiving the Inventory request, the M24LR16E-R runs the anticollision sequence. The Inventory_flag is set to 1. The meaning of flags 5 to 8 is shown in Table 29. The request contains: ● the flags, ● the Inventory command code (see Table 36), ● the AFI if the AFI flag is set, ● the mask length, ● the mask value, ● the CRC. The M24LR16E-R does not generate any answer in case of error. The response contains: ● the flags, ● the Unique ID. During an Inventory process, if the VCD does not receive an RF M24LR16E-R response, it waits for a time t3 before sending an EOF to switch to the next slot. t3 starts from the rising edge of the request EOF sent by the VCD. ● If the VCD sends a 100% modulated EOF, the minimum value of t3 is: t3min = 4384/fC (323.3µs) + tSOF ● If the VCD sends a 10% modulated EOF, the minimum value of t3 is: t3min = 4384/fC (323.3µs) + tNRT where: ● tSOF is the time required by the M24LR16E-R to transmit an SOF to the VCD, ● tNRT is the nominal response time of the M24LR16E-R. tNRT and tSOF are dependent on the M24LR16E-R-to-VCD data rate and subcarrier modulation mode. When configured in the RF busy mode, the RF WIP/BUSY pin is tied to 0 from the SOF starting the inventory command to the end of the M24LR16E-R response. If the M24LR16E- R does not receive the corresponding slot marker, the RF WIP/BUSY pin remains at 0 until the next RF power-off. Table 37. Inventory request format Request SOF Request_flags Inventory Optional AFI Mask length Mask value CRC16 Request EOF 8 bits 01h 8 bits 8 bits 0 - 64 bits 16 bits Table 38. Inventory response format Response SOF Response_ flags DSFID UID CRC16 Response EOF 8 bits 8 bits 64 bits 16 bits |
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