參數(shù)資料
型號： HCS412SN
廠商： Microchip Technology Inc.
英文描述： KEELOQ Code Hopping Encoder and Transponder
中文描述： 而Keeloq跳碼編碼器和轉發(fā)器
文件頁數(shù)： 27/44頁
文件大?。?/td> 704K
代理商： HCS412SN
2002 Microchip Technology Inc.
Preliminary
DS41099C-page 27
HCS412
4.3.8
ENABLE DEFAULT IFF COMMUNICATION
The
ENABLE DEFAULT IFF COMMUNICATION
com-
mand defaults certain HCS412 communication options
such that the transponder reader may communicate to
the device with a common (safe) protocol. The default
setting remains for the duration of the communication,
returning to normal only after a device RESET.
Default IFF communication settings:
Anticollision disabled
RF echo disabled
200
μ
s LF baud rate.
TABLE 4-9:
DEFAULT IFF COMMUNICATION COMMANDS
FIGURE 4-14: ENABLE DEFAULT IFF COMMUNICATION
4.4
IFF Communication Special Features
TABLE 4-10:
LF COMMUNICATION
SPECIAL FEATURES (LFSP)
4.4.1
PASSIVE PROXIMITY ACTIVATION
(LFSP = 10)
Enabling the Proximity Activation configuration option
allows the HCS412 to transmit a hopping code trans-
mission in response to a signal present on the LC0 pin.
The HCS412 sends out Field Acknowledge Sequence
in response to detecting the LF field (Figure 4-1). If the
HCS412 does not receive a command before the sec-
ond field Acknowledge sequence [within 255 LFT
E
‘s], it
will transmit a normal code hopping transmission for 2
seconds on the DATA pin. After 2 seconds the HCS412
reverts to normal transponder mode.
The 2 second transmission does not repeat when the
device is in the presence of a continuous LF field. The
HCS412 must be RESET, remove and reapply the LF
field, to activate another transmission.
The button status used in the code hopping transmis-
sion indicates a proximity activation by clearing the S0,
S1 and S2 button activation flags.
FIGURE 4-15: PROXIMITY ACTIVATION
Command
Description
Expected data In
Response
11100
Enable default IFF communication
None
None
Communication from reader to HCS412
Communication from HCS412 to reader
ACK
pulses
Inductive Comms
RF Comms
0
0
1
1
1
T
ATO
Activate
Field
ACK
Delay to
Command
Command
Delay
Next Command
Command
Start
2 LF
TE
L
M
LFSP1:0
Description
00
01
10
11
No special options enabled
Anticollision enabled (Section 4.3.1)
Proximity Activation enabled
Anticollision and RF Echo enabled
DATA (RF)
ACK
LF Communication from reader to HCS412
LF Communication from HCS412 to reader
Inductive
(LF)
No command received from
reader for 255 LF
TE
.
Transmit hopping code for 2
seconds
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相關代理商/技術參數(shù)
參數(shù)描述
HCS412T 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ Code Hopping Encoder and Transponder
HCS412T/SN 功能描述:編碼器、解碼器、復用器和解復用器 w/ Passive Entry RoHS:否 制造商:Micrel 產品: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
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、復用器和解復用器 w/ Passive Entry RoHS:否 制造商:Micrel 產品: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
HCS412TP 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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