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HCS473-PQTP датащи(PDF) 24 Page - Microchip Technology

номер детали HCS473-PQTP
подробное описание детали  Code Hopping Encoder and Transponder
PDF  68 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS473-PQTP датащи(HTML) 24 Page - Microchip Technology

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HCS473
DS40035C-page 22
Preliminary
 2002 Microchip Technology Inc.
3.2.2.4
Command Sequence
The transponder reader follows the HCS473’s Field
Acknowledge by sending the desired 3-bit command,
3-bit option or address, associated data and CRC;
each as required. LF commands are Pulse Position
Modulated (PPM) as shown in Figure 3-10. The last bit
(CRC bit) should be followed by leaving the field on for
T
FINH.
T
FINH should be appropriately adjusted to receive con-
secutive
commands
or
LF
responses.
See
Section 3.2.4 and Section 3.2.5 for LF response and
consecutive command considerations.
FIGURE 3-11:
HCS473 TRANSPONDER WAKE-UP SEQUENCE
Communication from reader to HCS473
Communication from HCS473 to reader
SKIPACK = 1 - Field Acknowledge is not sent
Inductive
(LC)
T
SF
Command
T
CMD
T
SFMAX
SKIPACK = 0 - Field Acknowledge sent when device wakes
Inductive
(LC)
RF
Response
(DATA)
125kHz Field
(on LC pins)
T
CMD
Command
T
CMD
3LF
TE
3LF
TE
3LF
TE 3LFTE
Simultaneous LF
Acknowledge
(LFRSP=1)
RF Acknowledge
(RFRSP=1)



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