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ST25TV02K 데이터시트(PDF) 65 Page - STMicroelectronics |
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ST25TV02K 데이터시트(HTML) 65 Page - STMicroelectronics |
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65 / 90 page ![]() • Request flags • Fast initiate command code Table 134. Fast initiate response format when Error_flag is NOT set Response SOF Response_flags DSFID UID CRC16 request EOF - 8 bits 8 bits 64 bits 16 bits - Response parameter: • DSFID • Unique ID 6.4.35 Inventory Initiated Before receiving Inventory Initiated command, the ST25TV02K/512 must have received an Initiate or a Fast Initiate command in order to set the Initiate_flag. If not, the ST25TV02K/512 do not answer to the Inventory Initiated command. On receiving the Inventory Initiated request, the ST25TV02K/512 run the anticollision sequence. The Inventory_flag must be set to 1. The ST25TV02K/512 do not generate any answer if an error occurs. The request contains: Table 135. Inventory Initiated request format Request SOF Request_flags Inventory Initiated IC Mfg code AFI (1) Mask length Mask value CRC16 request EOF - 8 bits D1h 02h 8 bits 8 bits 0 -64 bits 16 bits - 1. The field is optional. Request parameters: • Request flags • Inventory Initiated command code • AFI if the AFI flag is set • Mask length • Mask value Table 136. Inventory Initiated response format when Error_flag is NOT set Response SOF Response_flags DSFID UID CRC16 request EOF - 8 bits 8 bits 64 bits 16 bits - Response parameter: • DSFID • Unique ID During an Inventory process, if the VCD does not receive an RF ST25TV response, it waits t3 time 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 (323.3 μs) + tSOF • If the VCD sends a 10% modulated EOF, the minimum value of t3 is: t3min = 4384/fC (323.3 μs) + tNRT where: ST25TV02K ST25TV512 RF commands DS12074 - Rev 11 page 65/90 |
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