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HCS412I датащи(PDF) 28 Page - Microchip Technology

номер детали HCS412I
подробное описание детали  KEELOQ Code Hopping Encoder and Transponder
PDF  44 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS412I датащи(HTML) 28 Page - Microchip Technology

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HCS412
DS41099C-page 28
Preliminary
© 2002 Microchip Technology Inc.
4.4.2
ANTICOLLISION AND RF ECHO
(LFSP = 11)
In addition to enabling anticollision, this mode adds that
all HCS412 responses and Acknowledges are echoed
on the DATA output line. Responses are first transmit-
ted on the DATA line, followed by the equivalent data
transmitted
on
the
LF
LC
lines
(Figure 4-16,
Figure 4-17).
LF communication from the token to the transponder
reader has much less range than LF communication
from the reader to the token. Transmitting the informa-
tion on the DATA line increases communication range
by enabling longer range RF talk back.
The information is sent on the DATA line first to benefit
longer range passive-entry authentication times.
FIGURE 4-16: RF ECHO OPTION AND READ COMMAND
FIGURE 4-17: RF ECHO OPTION AND IFF COMMAND
FIGURE 4-18: RF ECHO OPTION AND REQUEST HOPPING CODE COMMAND
DATA (RF)
ACK
TPU
TATO
LF Communication from reader to HCS412
LF Communication from HCS412 to reader
TOTH
Inductive
(LF)
32-Bit Response
16-Bit
Response
16-Bit
Response
LF Communication from reader to HCS412
LF Communication from HCS412 to reader
DATA (RF)
Inductive (LF)
LF Communication from reader to HCS412
LF Communication from HCS412 to reader
DATA (RF)
Field
ACK
32-Bit PPM
Response
Next
Field
Ack
TOTH
TATO
Request Hopping
Code Opcode
Inductive
(LF)



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