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參數(shù)資料
| 型號(hào)： | HCS201 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | KEELOQ Code Hopping Encoder |
| 中文描述： | 而Keeloq跳碼編碼器 |
| 文件頁(yè)數(shù)： | 5/28頁(yè) |
| 文件大小： | 383K |
| 代理商： | HCS201 |
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2001 Microchip Technology Inc.
DS41098C-page 5
HCS201
2.0
ENCODER OPERATION
As shown in the typical application circuits (Figure 2-1),
the HCS201 is a simple device to use. It requires only
the addition of buttons and RF circuitry for use as the
transmitter in your security application. A description of
each pin is given in Table 2-1.
FIGURE 2-1:
TYPICAL CIRCUITS
TABLE 2-1:
PIN DESCRIPTIONS
The HCS201 will wake-up upon detecting a button
press and delay approximately 10 ms for button
debounce (Figure 2-2). The synchronization counter,
discrimination value and button information will be
encrypted to form the hopping code. The hopping code
portion will change every transmission, even if the
same button is pushed again. A code word that has
been transmitted will not repeat for more than 64K
transmissions. This provides more than 18 years of use
before a code is repeated; based on 10 operations per
day. Overflow information sent from the encoder can be
used to extend the number of unique transmissions to
more than 192K.
If in the transmit process it is detected that a new but-
ton(s) has been pressed, a RESET will immediately
occur and the current code word will not be completed.
Please note that buttons removed will not have any
effect on the code word unless no buttons remain
pressed; in which case the code word will be completed
and the power-down will occur.
V
DD
B0
Tx out
S0
S1
S2
V
DDB
STEP
V
DD
DATA
V
SS
Two button remote control
B1
Tx out
S0
S1
S2
STEP
V
DD
DATA
V
SS
Four button remote control
B3 B2 B1 B0
Note:
Up to 7 functions can be implemented by pressing
more than one button simultaneously or by using a
suitable diode array.
S0
S1
S2
STEP
V
DD
DATA
V
SS
V
DDB
V
DDB
V
DD
Tx out
Three button remote control with Step up regulator
V
DD
2.0-6.0V
External components sample values:
R = 5.1 K
L = 390 uH
Q = 2N3904
C = 1.0 uF D = ZHCS400CT (40V 0.4A Zetex)
(see Section 5.6 for a description of the Step Up circuit)
R
L
D
C
Q
Pin
Name
Pin
Number
Pin Description
S0
S1
S2
1
2
3
Switch input 0
Switch input 1
Switch input 2 / Clock pin for
Programming mode
Battery input pin, supplies power
to the step up control circuitry
Ground reference connection
Pulse Width Modulation (PWM)
output pin / Data pin for
Programming mode
Step up regulator switch control
Positive supply voltage
V
DDB
4
V
SS
DATA
5
6
STEP
V
DD
7
8
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| HCS201/SN | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 3.5-13V 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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