參數(shù)資料
型號： HCS412IP
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(zhuǎn)發(fā)器
文件頁數(shù)： 25/44頁
文件大?。?/td> 704K
代理商： HCS412IP
2002 Microchip Technology Inc.
Preliminary
DS41099C-page 25
HCS412
FIGURE 4-9:
PROGRAM SEQUENCE - CONSECUTIVE WORDS
FIGURE 4-10: PROGRAMMING - VERIFICATION
4.3.6
IFF CHALLENGE AND RESPONSE
The transponder reader sends one of four possible IFF
commands indicating which crypt key and which algo-
rithm to use to encrypt the challenge (Table 4-7).
The command is followed by the 32-bit challenge, typi-
cally a random number. The HCS412 encrypts the
challenge using the designated crypt key and algorithm
and responds with the 32-bit encrypted result. The
reader authenticates the response by comparing it to
the expected value.
The second crypt key and the seed value occupy the
same EEPROM storage area. To use the second crypt
key for IFF, the Seed Enable (SEED) and the Tempo-
rary Seed Enable (TMPSD) configuration options must
be disabled.
TABLE 4-7:
CHALLENGE AND RESPONSE COMMANDS
Communication from reader to HCS412
Communication from HCS412 to reader
A
P
C
T
C
1
K
S
A
S
A
S
A
S
A
1
K
1
C
1
R
’
L
M
L
M
L
M
L
M
Write 18x16-bit
words total.
Start
Verify
Communication from reader to HCS412
Communication from HCS412 to reader
A
P
C
T
1
K
S
A
1
A
S
A
Write 18x16-bit
words total.
1
T
‘
+
K
1
T
+
K
1
T
+
C
1
T
+
R
Verify 18x16-bit
words total.
L
M
L
M
L
M
L
M
0
1
01b Preamble
Start
1 LF
TE
16-bit
Response
L
M
3LF
TE
Delay between
each 16-bit word
Approximately 1ms
delay before verify
begins.
1
T
+
K
L
M
Note:
If seed transmissions are not appropriately
disabled, the HCS412 will default to using
KEY1 for IFF.
Command
Description
Expected data In
Response
10000
IFF using key-1 and IFF algorithm
IFF using key-1 and HOP algorithm
IFF using key-2 and IFF algorithm
IFF using key-2 and HOP algorithm
32-Bit Challenge
32-Bit Challenge
32-Bit Challenge
32-Bit Challenge
32-Bit Response
32-Bit Response
32-Bit Response
32-Bit Response
10001
10100
10101
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相關代理商/技術參數(shù)
參數(shù)描述
HCS412P 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder
HCS412SN 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder
HCS412T 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder
HCS412T/SN 功能描述:編碼器、解碼器、復用器和解復用器 w/ Passive Entry RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray
HCS412TI 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder
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