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HCS473-SLROM 数据表(PDF) 33 Page - Microchip Technology |
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HCS473-SLROM 数据表(HTML) 33 Page - Microchip Technology |
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33 / 68 page ![]() 2002 Microchip Technology Inc. Preliminary DS40035C-page 31 HCS473 Table 7-5 timing values are compensated only for HCS473 internal filter delays. The transponder reader designer must compensate communication timing accordingly for the cumulative antenna delays. Use LF Demodulator mode to see the effects of the internal filters and the LC antennae, Section 3.2.1.2. It must be clearly understood that the HCS473 core does not see the LF field immediately upon the base station turning it on, nor does it immediately detect its removal. If the internal analog delay and cumulative antenna delays are greater than a given low time, the HCS473 will obviously never “see” the low. FIGURE 3-19: LF ACK RESPONSE ADJUSTMENTS (LFRSP=1) TAOACK Command CRC Transport ACK TTPACK Inductive (LC Pins) RF Response (DATA Pin) TCMD Present Transport Code Sequence Inductive (LC Pins) Address Command CRC TWRT Write ACK 16-Bit Write Data RF Response (DATA Pin) TCMD Write Sequence Command CRC ACOL Off ACK Inductive (LC Pins) RF Response (DATA Pin) TCMD 32-Bit Transport Anticollision Off Sequence TFINH TFINH TFINH Next Command TCMD Next Command TCMD Next Command TCMD 5 LFTE 5 LFTE 5 LFTE TCMD TCMD TCMD Simultaneous LF ACK Simultaneous LF ACK Simultaneous LF ACK Transponder Select Sequence Command TID=0 12-Bit VID Transponder Select ACK TID=1 TID=2 6 LFTE TTSCMD Next Command TTSACK Inductive (LC Pins) RF Response (DATA Pin) TCMD Simultaneous LF ACK 5 LFTE |
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