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HCS412 Datasheet(PDF) 19 Page - Microchip Technology

No. de pieza HCS412
Descripción Electrónicos  KEELOQ짰 Code Hopping Encoder and Transponder Burglar alarm systems
PDF  52 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS412 Datasheet(HTML) 19 Page - Microchip Technology

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© 2011 Microchip Technology Inc.
DS41099D-page 19
HCS412
FIGURE 4-1:
FIELD ACKNOWLEDGE SEQUENCE
FIGURE 4-2:
LC PIN PULSE POSITION MODULATION (PPM)
3LFTE
TPU
3LFTE 3LFTE
2LFTE
Command
TATO
Communication from reader to HCS412
Filed ACK Sequence from HCS412 to reader
8LFTE
Inductive
Comms
RF
Comms
8LFTE
(DATA)
(LC)
RF
Comms
(DATA)
Field Ack sequence repeats every 255 LFTE if no command is received.
255LFTE
255LFTE
(LC)
Inductive
Comms
0
1
0
1
Start or
previous
bit
Transponder reader communication to the HCS412
HCS412 response back to the reader
2 LFTE
2 LFTE
4 LFTE
2 LFTE
2 LFTE LFTE
LFTE
LFTE
Start or
previous
bit
Extending the high time
is acceptable but the low
time should minimally
be 1 LFTE.
TBITC
TBITC
TBITR
TBITR
The HCS412 determines
bit values from rising edge
to rising edge times.



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