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參數(shù)資料
| 型號(hào)： | HCS509 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | KEELOQ Code Hopping Encoder Product Brief*(KeeLoq 譯碼器，是NTQ109和NTQ106的替代品) |
| 中文描述： | 而Keeloq跳碼編碼器產(chǎn)品簡(jiǎn)介*（而Keeloq譯碼器，是NTQ109和NTQ106的替代品） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 117K |
| 代理商： | HCS509 |
1996 Microchip Technology Inc.
Preliminary
DS40147A-page 9
HCS509
6.5
Synchronization with Decoder
The K
synchronization technique (Figure 6-4) which does not
require the calculation and storage of future codes. If
the stored counter value for that particular transmitter
and the counter value that was just decrypted are within
a formatted window of 16, the counter is stored and the
command is executed. If the counter value was not
within the single operation window, but is within the
double operation window of 32K window, the transmit-
ted synchronization value is stored in temporary loca-
tion, and it goes back to waiting for another
transmission. When the next valid transmission is
received, it will check the new value with the one in tem-
porary storage. If the two values are sequential, it is
assumed that the counter had just gotten out of the sin-
gle operation ‘window’, but is now back in sync, so the
new synchronization value is stored and the command
executed. If a transmitter has somehow gotten out of
the double operation window, the transmitter will not
work and must be relearned. Since the entire window
rotates after each valid transmission, codes that have
been used are part of the ‘blocked’ (32K) codes and are
no longer valid. This eliminates the possibility of grab-
bing a previous code and retransmitting to gain entry.
EE
L
OQ
technology features a sophisticated
FIGURE 6-4:
SYNCHRONIZATION WINDOW
Blocked
(32K Codes)
Entire Window
rotates to eliminate
use of previously
used codes
Current
Position
Double
Operation
(32K Codes)
Single Operation
Window (16 Codes)
7.0
INTEGRATING THE HCS509
INTO A SYSTEM
The HCS509 can act as a stand alone decoder or be
interfaced to a microcontroller. Typical stand alone
applications include garage door openers and elec-
tronic door locks. In stand alone applications the
HCS509 will handle learning, reception, decryption and
validation of the received code and generate the appro-
priate output. For a garage door opener the HCS509
input will be connected to a RF receiver and the output
to a relay driver to connect a motor controller.
Typical systems where the HCS509 will be connected
to a microcontroller include vehicle and home security
systems. The HCS509 input will be connected to a RF
receiver and the function outputs to the microcontroller.
The HCS509 will handle all the decoding functions and
the microcontroller all the system functions.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCS509-/P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Remote-Control Receiver/Decoder |
| HCS509-/SN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Remote-Control Receiver/Decoder |
| HCS509-I/P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Remote-Control Receiver/Decoder |
| HCS509-I/SN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Remote-Control Receiver/Decoder |
| HCS512 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ CODE HOPPING DECODER |
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