參數(shù)資料
型號(hào)： HCS412T
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(yè)數(shù)： 13/44頁(yè)
文件大?。?/td> 704K
代理商： HCS412T
2002 Microchip Technology Inc.
Preliminary
DS41099C-page 13
HCS412
FIGURE 3-5:
PWM TRANSMISSION FORMAT—MOD = 0
FIGURE 3-6:
MANCHESTER TRANSMISSION FORMAT—MOD = 1
3.4
Encoder Special Features
3.4.1
CODE WORD COMPLETION AND
MINIMUM CODE WORDS
The code word completion feature ensures that entire
code words are transmitted, even if the active button is
released before the code word transmission is com-
plete. If the button is held down beyond the time for one
code word, multiple complete code words will result.
The device default is that a momentary button press
will transmit at least one complete code word. Enable
the Minimum Four Code Words (MTX4) configuration
option to extend this feature such that a minimum of 4
code words are completed on a momentary button acti-
vation.
3.4.2
AUTO-SHUTOFF
The Auto-shutoff function prevents battery drain should
a button get stuck for a long period of time. The time
period (T
TO
) is approximately 20 seconds, after which
the device will enter Time-out mode.
The device will stop transmitting in Time-out mode but
there will be leakage across the stuck button input’s
internal pull-down resistor. The current draw will there-
fore be higher than when in Standby mode.
3.4.3
CODE WORD BLANKING ENABLE
Federal Communications Commission (FCC) part 15
rules specify the limits on worst case average funda-
mental power and harmonics that can be transmitted in
a 100 ms window. For FCC approval purposes, it may
therefore be advantageous to minimize the transmis-
sion duty cycle. This can be achieved by minimizing the
on-time of the individual bits as well as by blanking out
consecutive code words.
TOTAL TRANSMISSION:
Preamble Sync
Encrypt
Fixed
Guard
1 CODE WORD
Preamble Sync
Encrypt
LOGIC "1"
Guard
Time
31 RFT
E
Preamble, 50% Duty Cycle
Long Preamble (LPRE) disabled
Encrypted
Portion
Fixed Code
Portion
LOGIC "0"
10T
E
Header
T
E
T
E
T
E
CODE WORD
TOTAL TRANSMISSION:
Sync
Encrypt
Fixed
Guard
1 CODE WORD
Preamble
Sync
Encrypt
Preamble
CODE WORD
Guard
Time
50% Duty
Preamble
Header
Encrypted
Portion
Fixed Code
Portion
START bit
STOP bit
bit 0 bit 1 bit 2
LOGIC "0"
LOGIC "1"
T
E
T
E
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HCS412T/SN 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)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(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
HCS412TI 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder
HCS412T-I/SN 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)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(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
HCS412TP 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder
HCS412TSN 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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