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參數(shù)資料
| 型號： | HCS473 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Code Hopping Encoder and Transponder |
| 中文描述： | 跳碼編碼器和轉(zhuǎn)發(fā)器 |
| 文件頁數(shù)： | 19/68頁 |
| 文件大小： | 1629K |
| 代理商： | HCS473 |
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2002 Microchip Technology Inc.
Preliminary
DS40035C-page 17
HCS473
3.1.4.14
Guard Time Select (GSEL)
The guard time (T
G
) select option determines the time
between consecutive code words when no data is
transmitted. The guard time may be selected in conjuc-
tion with the RF baud rate and preamble duty cycle to
control time-averaged power output for transmitter cer-
tification.
GSEL options:
3 RF
TE
6.4 ms
51.2 ms
102.4 ms
3.1.4.15
Minimum Code Words (MTX)
The Minimum Code Words (MTX) configuration option
determines the minimum number of code words trans-
mitted when a momentary switch input is taken high for
more than T
PU
, or when a proximity activation occurs.
MTX options:
1 code word
2 code words
4 code words
8 code words
3.1.4.16
Timeout Select (TSEL)
The HCS473’s Timeout function prevents battery drain
should a switch input remain high (stuck button) longer
than the selectable TSEL time. After the TSEL time, the
device will return to Low-power mode.
The device will stop transmitting in Low-power 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 if no button were stuck.
TSEL options:
4s
8s
16s
32s
3.1.4.17
Long Preamble Enable (LPRE)
Enabling the Long Preamble configuration option
extends the first code word’s preamble to a ‘long’ pre-
amble time LPRL
;
allowing the receiver more time to
wake and bias before the data bits arrive. The longer
preamble will be a square wave at the selected RFT
E
.
Subsequent code words begin with the standard pre-
amble length.
LPRE options:
Standard 16 high pulse preamble
Long preamble, duration defined by LPRL
3.1.4.18
Long Preamble Length (LPRL)
The long preamble length option selects the first code
word’s preamble length when the long preamble option
(LPRE) is enabled. Only the first code word begins with
the long preamble, subsequent code words begin with
the standard 16 high pulses preamble.
LPRL options:
75 ms
100 ms
3.1.4.19
Preamble Duty Cycle (PRD)
The preamble duty cycle can be set to either 33% or
50% to limit the average power transmitted, Figure 3-7.
PRD options:
50% Duty Cycle
33% Duty Cycle
FIGURE 3-7:
PREAMBLE FORMATS
3.1.5
LED OPERATION
The LED pin output varies depending on whether the
device V
DD
is greater than V
LOWSEL
(a good battery) or
below V
LOWSEL
(a flat battery).
The LED pin will periodically be driven low as long as
the device is transmitting and the battery is good. If the
supply voltage drops below the specified V
LOWSEL
trip
point, the LED pin will be driven low only once for any
given device activation so long as the low battery con-
dition remains (Figure 3-8). If the battery voltage recov-
ers during the transmission, the LED will begin blinking
again.
T
E
T
E
T
E
2T
E
33% Duty Cycle
50% Duty Cycle
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| 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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| HCS473-I/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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HCS473-I/SL | 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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