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ST25DV04KC Datasheet(PDF) 87 Page - STMicroelectronics |
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ST25DV04KC Datasheet(HTML) 87 Page - STMicroelectronics |
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87 / 203 page  7.6.4 Inventory Upon receiving the Inventory request, the ST25DVxxKC runs the anticollision sequence. The Inventory_flag is set to 1. The meaning of flags 5 to 8 is shown in Table 99. Request flags 5 to 8 when inventory_flag, Bit 3 = 1. The request contains: • the flags • the Inventory command code (001) • the AFI if the AFI flag is set • the mask length • the mask value if mask length is different from 0 • the CRC The ST25DVxxKC does not generate any answer in case of error. Table 105. 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 - The response contains: • the flags • the Unique ID Table 106. Inventory response format Response SOF Response_flags DSFID UID CRC16 Response EOF - 8 bits 8 bits 64 bits 16 bits - During an Inventory process, if the VCD does not receive an RF ST25DVxxKC 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 + t2min where: • tSOF is the time required by the ST25DVxxKC to transmit an SOF to the VCD, • tNRT is the nominal response time of the ST25DVxxKC. tNRT and tSOF are dependent on the ST25DVxxKC-to-VCD data rate and subcarrier modulation mode. Note: In case of error, no response is sent by ST25DVxxKC. 7.6.5 Stay Quiet On receiving the Stay Quiet command, the ST25DVxxKC enters the Quiet state if no error occurs, and does NOT send back a response. There is NO response to the Stay Quiet command even if an error occurs. The Option_flag is not supported. The Inventory_flag must be set to 0. When in the Quiet state: • the ST25DVxxKC does not process any request if the Inventory_flag is set, • the ST25DVxxKC processes any Addressed request. The ST25DVxxKC exits the Quiet state when: • it is reset (power off), ST25DV04KC ST25DV16KC ST25DV64KC RF commands DS13519 - Rev 3 page 87/203 |
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