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HCS473 데이터시트(PDF) 33 Page - Microchip Technology

부품명 HCS473
상세설명  Code Hopping Encoder and Transponder
PDF  68 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS473 데이터시트(HTML) 33 Page - Microchip Technology

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 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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