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參數(shù)資料
| 型號： | HCS361-P |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | IC CONV AC/DC -5V 100MA SIP9 |
| 中文描述： | 而Keeloq跳碼編碼器 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 343K |
| 代理商： | HCS361-P |
HCS361
DS40146C-page 12
Preliminary
1996 Microchip Technology Inc.
5.0
SPECIAL FEATURES
5.1
Code Word Completion
Code word completion is an automatic feature that
ensures that the entire code word is transmitted, even
if the button is released before the transmission is com-
plete and that a minimum of two words are completed.
The HCS361 encoder powers itself up when a button is
pushed and powers itself down after the current trans-
mission is finished, if the user has already released the
button. If the button is held down beyond the time for
two transmissions, then multiple transmissions will
result. The HCS361 transmits at least two transmis-
sions before powering down. If another button is acti-
vated during a transmission, the active transmission will
be aborted and the new code will be generated using
the new button information.
5.2
Blank Alternate Code Word
Federal Communications Commission (FCC) part 15
rules specify the limits on fundamental power and
harmonics that can be transmitted. Power is calculated
on the worst case average power transmitted in a
100ms window. It is therefore advantageous to
minimize the duty cycle of the transmitted word. This
can be achieved by minimizing the duty cycle of the
individual bits and by blanking out consecutive words.
Blank Alternate Code Word (BACW) is used for
reducing the average power of a transmission
(Figure 5-1). This is a selectable feature. Using the
BACW allows the user to transmit a higher amplitude
transmission if the transmission length is shorter. The
FCC puts constraints on the average power that can be
transmitted by a device, and BACW effectively prevents
continuous transmission by only allowing the transmis-
sion of every second word. This reduces the average
power transmitted and hence, assists in FCC approval
of a transmitter device.
5.3
CRC (Cycle Redundancy Check) Bits
The CRC bits are calculated on the 65 previously trans-
mitted bits. The CRC bits can be used by the receiver
to check the data integrity before processing starts. The
CRC can detect all single bit and 66% of double bit
errors. The CRC is computed as follows:
EQUATION 0-1:
CRC CALCULATION
CRC
0
[ ]
n
=
and
with
and
Di
n
the nth transmission bit 0
≤
n
≤
64
5.4
Secure Learning
In order to increase the level of security in a system, it
is possible for the receiver to implement what is known
as a secure learning function. This can be done by uti-
lizing the seed value on the HCS361 which is
stored in
EEPROM. Instead of the normal key generation
method being used to create the encryption key, this
seed value is used and there should not be any mathe-
matical relationship between serial numbers and seeds
for the best security.
5.5
Auto-shutoff
The Auto-shutoff function automatically stops the
device from transmitting if a button inadvertently gets
pressed for a long period of time. This will prevent the
device from draining the battery if a button gets pressed
while the transmitter is in a pocket or purse. This func-
tion can be enabled or disabled and is selected by set-
ting or clearing the time-out bit (Section 3.5.7). Setting
this bit will enable the function (turn Auto-shutoff func-
tion on) and clearing the bit will disable the function.
Time-out period is approximately 25 seconds.
5.6
V
LOW
: Voltage LOW Indicator
The V
LOW
bit is transmitted with every transmission
(Figure 4-2) and will be transmitted as a one if the
operating voltage has dropped below the low voltage
trip point, typically 3.8V at 25
°
C. This V
LOW
signal is
transmitted so the receiver can give an indication to the
user that the transmitter battery is low.
5.7
LED Output Operation
During normal transmission the LED output is LOW. If
the supply voltage drops below the low voltage trip
point, the LED output will be toggled at approximately
1Hz during the transmission.
FIGURE 5-1:
BLANK ALTERNATE CODE WORD
CRC
1
[ ]
n
1
+
Di
n
∧
CRC
0
[ ]
n
1
+
CRC
0
[ ]
n
Di
n
∧
(
)
CRC
1
[ ]
n
∧
=
CRC
1 0
[
]
0
0
=
One Code Word
100ms
BACW Disabled
(All words transmitted)
BACW Enabled
(1 out of 2 transmitted)
A
2A
100ms
100ms
100ms
Amplitude
Time
Min Tx Length
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| HCS361-SN | IC AC/DC CONV 12V 350MA SIP12 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCS361-SN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ CODE HOPPING ENCODER |
| HCS361T/SN | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 2-6.6V 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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HCS361T-I/SN | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 2-6.6V 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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HCS362 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Memory Programming Specification |
| HCS362_11 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ? Code Hopping Encoder Non-volatile synchronization data |
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