參數(shù)資料
型號(hào)： 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)： 14/44頁
文件大?。?/td> 704K
代理商： HCS412TI
HCS412
DS41099C-page 14
Preliminary
2002 Microchip Technology Inc.
The Code Word Blanking Enable (CWBE) option may
be used to reduce the average power of a transmission
by transmitting only every second or every fourth code
word
(Figure 3-7).
This
determined in conjunction with the baud rate selection
bit RFBSL (Table 3-7).
selectable
feature
is
Enabling the CWBE option may similarly allow the user
to transmit a higher amplitude transmission as the time
averaged power is reduced. CWBE effectively halves
the RF on-time for a given transmission so the RF out-
put power could theoretically be doubled while main-
taining the same time averaged output power.
FIGURE 3-7:
CODE WORD BLANKING
RF Output Amplitude = A
TABLE 3-7:
CODE WORD BLANKING ENABLE (CWBE)
3.4.4
DELAYED INCREMENT (DINC)
The HCS412
’s Delayed Increment feature advances
the synchronization counter by 12 a period of T
TO
after
the encoder activation occurs, for additional security.
The next activation will show a synchronization counter
increase of 13, not 1.
If the active button is released before the time-out T
TO
has elapsed, the device stops transmitting but remains
powered for the duration of the time-out period. The
device will then advance the stored synchronization
counter by 12 before powering down.
If the active button is released before the time-out T
TO
has elapsed and another activation occurs while wait-
ing out the time-out period, the time-out counter will
RESET and the resulting transmission will contain syn-
chronization counter value +1.
3.4.5
PLL INTERFACE
If the RFEN/S2/LC1 pin is configured as an RF enable
output, the pin’s behavior is coordinated with the DATA
pin to enable a typical PLL’s ASK or FSK mode.
The PLL Interface (AFSK) configuration option controls
the output as shown in Figure 3-8.
PLL INTERFACE(AFSK)
TABLE 3-8:
3.4.6
LED OUTPUT
During normal operation (good battery), while transmit-
ting data the device’s LED pin will periodically be driven
low as indicated in Figure 3-9.
If the supply voltage drops below the trip point specified
by VLDWSEL, the LED pin will be driven low only once
for a longer period of time.
3.4.7
LONG PREAMBLE (LPRE)
Enabling the Long Preamble configuration option
extends the first code word’s 50% duty cycle preamble
to a ‘long’ preamble time T
LPRE
. The longer preamble
will be a square wave at the selected RFT
E
(Figure 3-10).
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
CWBE Disabled
(All words transmitted)
CWBE Enabled
(1 out of 2 transmitted)
A
2A
CWBE Enabled
(1 out of 4 transmitted)
4A
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Code
Word
Note:
If delayed increment is enabled, the QUE
counter will not reset to 0 until
timeout T
TO
has elapsed
.
AFSK
Description
0
1
ASK PLL Setup
FSK PLL Setup
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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(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
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(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
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