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RFHCS362G データシート(PDF) 13 Page - Microchip Technology

部品番号 RFHCS362G
部品情報  KEELOQ짰 Code Hopping Encoder with UHF ASK/FSK Transmitter
PDF  54 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

RFHCS362G データシート(HTML) 13 Page - Microchip Technology

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© 2011 Microchip Technology Inc.
DS41189B-page 13
rfHCS362G/362F
3.1
Transmission Modulation Format
The rfHCS362 transmission is made up of several code
words. Each code word consists of a preamble, a
header and data (see Figure 3-2).
The code words are separated by a Guard Time that
can be set to 0 ms, 6.4 ms, 25.6 ms or 76.8 ms with the
Guard Time Select (GUARD[0..1]) configuration
option. All other timing specifications for the modulation
formats are based on a basic timing element (TE). This
Timing Element can be set to 100
μs, 200 μs, 400 μs
or 800
μs with the Baud Rate Select (BSEL[0..1])
configuration option. The Header Time can be set to
3TE or 10 TE with the Header Select (HEADER) config-
uration option.
There are two different modulation formats available on
the rfHCS362 that can be set using the Modulation
Select (MOD) configuration option:
• Pulse Width Modulation (PWM)
• Manchester Encoding
Modulation formats are shown in Figure 3-3 and
Figure 3-4. Code word data formats are shown in
Figure 3-6.
FIGURE 3-2:
CODE WORD TRANSMISSION SEQUENCE
FIGURE 3-3:
PULSE WIDTH MODULATION TRANSMISSION FORMAT
FIGURE 3-4:
MANCHESTER TRANSMISSION FORMAT
Header
Encrypt
Fixed
Guard
1 CODE WORD
Preamble
Encrypt
Preamble
Header
LOGIC "1"
Guard
Time
31 TE
Encrypted
Portion
Fixed Code
Portion
LOGIC "0"
Preamble
3/10
Header
TE
TE
TE
TE
1
16
TBP
Guard
Preamble
Header
Encrypted
Fixed Code
1 2
START bit
STOP bit
Time
Portion
Portion
16
bit 0 bit 1 bit 2
LOGIC "0"
LOGIC "1"
TE TE
TBP



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