參數(shù)資料
型號: HCS412TSN
廠商: Microchip Technology Inc.
英文描述: KEELOQ Code Hopping Encoder and Transponder
中文描述: 而Keeloq跳碼編碼器和轉發(fā)器
文件頁數(shù): 28/44頁
文件大?。?/td> 704K
代理商: HCS412TSN
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)
C
(
R
(
P
H
N
F
(
R
(
ACK
T
PU
T
ATO
LF Communication from reader to HCS412
LF Communication from HCS412 to reader
T
OTH
Inductive
(LF)
32-Bit Response
16-Bit
Response
16-Bit
Response
L
M
L
M
O
(
R
(
P
H
N
F
(
R
(
LF Communication from reader to HCS412
LF Communication from HCS412 to reader
DATA (RF)
Inductive (LF)
L
M
L
M
P
H
F
(
H
(
LF Communication from reader to HCS412
LF Communication from HCS412 to reader
DATA (RF)
L
M
L
M
Field
ACK
32-Bit PPM
Response
Next
Field
Ack
T
OTH
T
ATO
Request Hopping
Code Opcode
Inductive
(LF)
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相關代理商/技術參數(shù)
參數(shù)描述
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