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MCS3122-I/ST データシート(PDF) 14 Page - Microchip Technology

部品番号 MCS3122-I/ST
部品情報  MCS3122 Advanced KEELOQ짰 Technology Encoder Data Sheet
PDF  26 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

MCS3122-I/ST データシート(HTML) 14 Page - Microchip Technology

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MCS3122
DS40001762A-page 14
 2014 Microchip Technology Inc.
5.7
Crystal Selection
Once the frequency band has been selected, the choice
of crystal frequency is flexible provided the crystal
meets the specifications summarized in Table 5-6, the
boundaries of the Encoder Frequency Configuration
value are followed and the RF transmit frequency error
is acceptable to the system design.
5.8
Seed Button Configuration
The MCS3122 allows the user to select which button
combination will output the seed transmission instead
of the normal data packet. Table 5-7 lists all the
possible button combinations.
5.9
Code Word Completion
MCS3122 always ensures that a full and complete
code word is transmitted even if all buttons are
released before transmission is complete.
5.10
Maximum Code Words
This feature sets a maximum number of code words
transmitted by a button configuration. If a button is kept
pressed, the maximum allowed code words will be
transmitted. If a new button is pressed or a new button
press combination is used, the process will be restarted
and the maximum number of words will be transmitted.
TABLE 5-6:
CRYSTAL RESONATOR SPECIFICATIONS
Symbol
Description
Min.
Typ.
Max.
Unit
fREF
Crystal Frequency
—
26 or 24(1)
—MHz
CL
Load Capacitance
—
15
—
pF
ESR
Equivalent Series Resistance
—
—
100
Ω
Note 1:
When selecting the 315.000 MHz frequency, a 24 MHz crystal is required.
TABLE 5-7:
SEED BUTTON
CONFIGURATION OPTIONS
SW2
SW1
SW0
Bit Settings
<3> and
<1:0>
Closed
Closed
Closed
000
Closed
Closed
Open
001
Closed
Open
Closed
010
Closed
Open
Open
011
Open
Closed
Closed
100
Open
Closed
Open
101
Open
Open
Closed
110
Open
Open
Open
111(1)
Note 1:
The button combination corresponding to
the setting ‘111’ will not generate a seed
combination since it corresponds to all
buttons not pressed. Setting the bits to
this value will disable the seed packet
sending (i.e., no button combination will
send a seed code).



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