參數(shù)資料
型號： HCS412TI
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)： 12/44頁
文件大?。?/td> 704K
代理商： HCS412TI
HCS412
DS41099C-page 12
Preliminary
2002 Microchip Technology Inc.
FIGURE 3-4:
SEED CODE WORD DATA FORMAT
TABLE 3-4:
SEED TRANSMISSION OPTIONS
3.3
Transmission Data Modulation
The data modulation format is selectable between
Pulse Width Modulation (PWM) and Manchester using
the Data Modulation (MOD) configuration option.
Regardless of the modulation format, each code word
contains a leading 50% duty cycle preamble and a syn-
chronization header to wake the receiver and provide
synchronization events for the receive routine. Each
code word also contains a trailing guard time, separat-
ing code words. Manchester encoding further includes
a leading and closing ‘1’ around each 69-bit data block.
The same code word repeats as long as the same input
pins remain active, until a time-out occurs or a delayed
seed transmission is activated.
The modulated data timing is typically referred to in
multiples of a Basic Timing Element (RFT
E
). ‘RF’ T
E
because the DATA pin output is typically sent through a
RF transmitter to the decoder or transponder reader.
RFT
E
may be selected using the Transmission Baud
Rate (RFBSL) configuration option (Table 3-6).
TABLE 3-5:
TRANSMISSION
MODULATION TIMING
* Enabling long preambles extends the first code
word’s preamble to T
LPRE
milliseconds.
TABLE 3-6:
BAUD RATE SELECTION (RFBSL)
SEED
TMPSD
Description
0
0
0
1
SEED transmissions permanently disabled
Limited SEED transmissions
(Note 1)
- temporarily enabled until the
7 LSb’s of the synchronization counter wrap from 7Fh to 00h
SEED transmissions permanently enabled
(Note 1)
SEED transmissions permanently disabled (2 key IFF enabled)
1
1
0
1
Note 1:
Refer to Table 3-1 for appropriate button activation of SEED transmissions.
QUE
2 Bits
CRC
2 Bits
V
LOW
1-Bit
BUT
4 Bits
SDVAL3
12 Most Sig Bits
S2 S1 S0 LC0
Note:
SEED transmissions only allowed when appropriate configuration bits are set.
SDVAL2
16 Bits
SDVAL1
16 Bits
SDVAL0
16 Least Sig Bits
Q1 Q0 C1 C0
LSb
69 Data bits
Transmitted
LSb first.
MSb
Shaded data included in CRC calculation
Period
PWM
Manchester
Units
Preamble
Header
Data
Guard
31*
10
207
46
31*
4
142
31
RFT
E
RFT
E
RFT
E
RFT
E
RFBSL1:0
CWBE
PWM RFT
E
Manchester RFT
E
Transmit...
00b
01b
X
0
1
0
1
0
1
400
μ
s
200
μ
s
200
μ
s
100
μ
s
100
μ
s
100
μ
s
100
μ
s
800
μ
s
400
μ
s
400
μ
s
200
μ
s
200
μ
s
200
μ
s
200
μ
s
All code words
All code words
Every other code word
All code words
Every other code word
All code word
Every fourth code word
10b
11b
相關(guān)PDF資料
PDF描述
HCS412TP Dual PCI 2.2 Hot-Swap Controllers
HCS412 Code Hopping Encoder and Transponder(編碼器和收發(fā)兩用機(jī))
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
HCS473 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Code Hopping Encoder and Transponder
HCS473/P 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
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