參數(shù)資料
型號： 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
文件頁數(shù)： 29/44頁
文件大?。?/td> 704K
代理商： HCS412T
2002 Microchip Technology Inc.
Preliminary
DS41099C-page 29
HCS412
4.4.3
INTELLIGENT DAMPING (IDAMP)
A high Q-factor LC antenna circuit connected to the
HCS412 will continue to resonate after a strong LF field
is removed, slowly decaying. The slow decay makes
fast communication near the reader difficult as data bit
low times disappear.
If the Intelligent Damping option is enabled, the
HCS412 will clamp the LC pins through a 2 k
resistor
for 5
μ
s every 1/4 LF
TE
, whenever the HCS412 is
expecting data from the transponder reader. The intel-
ligent damping pulses start 12.5 LF
TE
after the
Acknowledge sequence is complete and continue for
12.5 LF
TE
. If the HCS412 detects data from the reader
while sending out damping pulses, it will continue to
send the damping pulses.
TABLE 4-11:
INTELLIGENT DAMPING
(IDAMP)
FIGURE 4-19: INTELLIGENT DAMPING
TABLE 4-12:
LF TIMING SPECIFICATIONS
IDAMP
Description
0
1
Intelligent damping enabled
Intelligent damping disabled
12.5 LF
TE
12.5 LF
TE
5
μ
s
1/4 LF
TE
5
μ
s
DAMP PULSES
Bit From
reader
Field
ACK
Parameter
Symbol
Min.
Typ.
Max.
Units
Time Element
IFFB = 0
IFFB = 1
LF
TE
180
90
4.2
13
—
—
—
—
—
3.87
2.6
2.2
—
—
10.26
200
100
6
220
110
7.8
μ
s
Power-up Time
Acknowledge to Opcode Time
PPM Command Bit Time
T
PU
T
ATO
T
BITC
ms
LF
TE
LF
TE
Data = 0
Data = 1
Data = 0
Data = 1
4
6
2
3
13
4.3
—
—
—
—
—
—
—
4.73
—
—
—
—
12.54
PPM Response Bit Time
T
BITR
LF
TE
Read Response Time
IFF Response Time
Opcode to Data Input Time
Transport Code to Data Input Time
Encoder Select Acknowledge Time
IFF EEPROM Write Time (16 bits)
Op Code to Hop Code Response Time
T
RT
T
IT
T
OTD
T
TTD
T
ESA
T
WR
T
OTH
LF
TE
ms
ms
ms
μ
s
ms
ms
LF
TE
+100
30
11.4
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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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