參數(shù)資料
型號(hào)： RFHCS362F
廠商： Microchip Technology Inc.
英文描述： Code Hopping Encoder with UHF ASK/FSK Transmitter
中文描述： 跳碼編碼器的超高頻ASK / FSK發(fā)射器
文件頁(yè)數(shù)： 4/60頁(yè)
文件大?。?/td> 502K
代理商： RFHCS362F
rfHCS362G/362F
DS41189A-page 4
Preliminary
2002 Microchip Technology Inc.
-
Normal Learning
The receiver uses information transmitted
during normal operation to derive the encryp-
tion key and decrypt the received code
word’s encrypted portion.
-
Secure Learn
The transmitter is activated through a special
button combination to transmit a stored 60-bit
seed value used to generate the transmitter’s
encryption key. The receiver uses this seed
value to derive the same encryption key and
decrypt the received code word’s encrypted
portion.
Manufacturer’s code
– A unique and secret 64-
bit number used to generate unique encoder
encryption keys. Each encoder is programmed
with a encryption key that is a function of the man-
ufacturer’s code. Each decoder is programmed
with the manufacturer code itself.
1.2
Applications
The rfHCS362G/362F is suited for secure wireless
remote control applications. The EEPROM technology
makes customizing application programs (transmitter
codes, appliance settings, etc.) extremely fast and con-
venient. The small footprint packages are suitable for
applications with space limitations. Low-cost, low-
power, high performance, ease of use and I/O flexibility
make the rfHCS362G/362F very versatile. Typical
application circuits are shown in Figure 1-5 and
Figure 1-6.
Most low-end keyless entry transmitters are given a
fixed identification code that is transmitted every time a
button is pushed. The number of unique identification
codes in a low-end system is usually a relatively small
number. These shortcomings provide an opportunity
for a sophisticated thief to create a device that ‘grabs’
a transmission and retransmits it later, or a device that
quickly ‘scans’ all possible identification codes until the
correct one is found.
The rfHCS362G/362F, on the other hand, employs the
K
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code hopping technology coupled with a trans-
mission length of 66 bits to virtually eliminate the use of
code ‘grabbing’ or code ‘scanning’. The high security
level of the rfHCS362G/362F is based on patented
technology. A block cipher based on a block length of
32 bits and a key length of 64 bits is used. The algo-
rithm obscures the information in such a way that even
if the transmission information (before coding) differs
by only one bit from that of the previous transmission,
the next coded transmission will be completely differ-
ent. Statistically, if only one bit in the 32-bit string of
information changes, approximately 50 percent of the
coded transmission bits will change.
FIGURE 1-1:
ADDITIONAL BUTTON INPUTS
Up to 7 button inputs can be implemented making them
look like a binary value to the 3 Sx inputs. This is done
with switching diodes as shown in Figure 1-1. The dis-
advantage is that simultaneously pressed buttons now
appear as if a single button is pressed.
The rfHCS362G/362F has a small EEPROM array
which must be loaded with several parameters before
use. These are most often programmed by the manu-
facturer at the time of production. The most important
of these are:
A 28-bit serial number, typically unique for every
encoder
An encryption key
An initial 16-bit synchronization value
A 16-bit configuration value
The encryption key generation typically inputs the
transmitter serial number and 64-bit manufacturer’s
code into the key generation algorithm (Figure 1-2).
The manufacturer’s code is chosen by the system
manufacturer and must be carefully controlled as it is a
pivotal part of the overall system security.
The 16-bit synchronization counter is the basis behind
the transmitted code word changing for each transmis-
sion; it increments each time a button is pressed. Due
to the code hopping algorithm’s complexity, each incre-
ment of the synchronization value results in about 50%
of the bits changing in the transmitted code word.
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RFEN
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相關(guān)PDF資料
PDF描述
RFHCS362G Code Hopping Encoder with UHF ASK/FSK Transmitter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RFHCS362F-I/SS 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Code Hopping Encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線(xiàn)路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray
RFHCS362FT-I/SS 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Code Hopping Encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線(xiàn)路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray
RFHCS362G 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:Code Hopping Encoder with UHF ASK/FSK Transmitter
RFHCS362G/362F 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:MCP23016 Datasheet
RFHCS362G_11 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:KEELOQ? Code Hopping Encoder with UHF ASK/FSK Transmitter
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