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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SRT512 датащи(PDF) 12 Page - STMicroelectronics |
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SRT512 датащи(HTML) 12 Page - STMicroelectronics |
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12 / 46 page  Data transfer SRT512 12/46 Doc ID 13277 Rev 4 3.2.3 Answer end of frame The EOF shown in Figure 9 is composed of: ● followed by 10 ETUs at logic-0, ● followed by 2 ETUs at logic-1. Figure 9. Answer end of frame 3.3 Transmission frame Between the request data transfer and the answer data transfer, all ASK and BPSK modulations are suspended for a minimum time of t0 = 128/ƒS. This delay allows the reader to switch from Transmission to Reception mode. It is repeated after each frame. After t0, the 13.56 MHz carrier frequency is modulated by the SRT512 at 847 kHz for a period of t1 =128/ƒS to allow the reader to synchronize. After t1, the first phase transition generated by the SRT512 forms the start bit (‘0’) of the answer SOF. After the falling edge of the answer EOF, the reader waits a minimum time, t2, before sending a new request frame to the SRT512. Figure 10. Example of a complete transmission frame ai07665 ETU b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 0000000000 11 12 bits 10 bits Sync 128/fs 128/fs fs=847.5kHz t DR t 0 t 1 SOF Cmd Data CRC CRC EOF 10 bits 10 bits 10 bits 10 bits 12 bits 10 bits 10 bits 10 bits Data CRC CRC SOF EOF 12 bits SOF t 2 Ai13506b Input data transfer using ASK Output data transfer using BPSK Sent by the Reader Sent by SRT512 at 106kb/s |
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