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MICRF405 датащи(PDF) 14 Page - Micrel Semiconductor

номер детали MICRF405
подробное описание детали  290MHz-980MHz ISM Band ASK / FSK Transmitter
PDF  46 Pages
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF405 датащи(HTML) 14 Page - Micrel Semiconductor

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Micrel
MICRF405
April 2006
14
M9999-041906
(408) 955-1690
Preamble
SyncID
Frame length
Payload
CRC
1-4 bytes
1-4 bytes
1 byte
2/2/1-253/254/255 bytes
2/1/0 bytes
Table 7. Virtual Wire Packet Structure Overview.
SyncID_Len
SynchID_Len
Start of transmitted packet. Leftmost byte transmitted first
0
0
Preamble
SyncIDO
Frame length
0
1
Preamble
SyncIDO
SyncID1
Frame length
1
0
Preamble
SyncIDO
SyncID1
SyncID2
Frame length
1
1
Preamble
SyncIDO
SyncID1
SyncID2
SyncID3
Frame length
Table 8. Virtual Wire Packet Structure, SyncID field.
Packet Engine Overview:
• Preamble generated by packet engine: 1-4 bytes equal 10101010. Length set by Pream_Len[1:0]
• SyncID field added by packet engine: 1-4 bytes of user defined content. Length set by SyncID_Len[1:0].
Content set in registers SyncID0, SyncID1, SyncID2 and SyncID3, address 28-25.
• The frame length is entered by user for each packet. Specify the length of the payload and CRC fields in
bytes, ranging from 2 to (255 ÷ # CRC bytes). # CRC bytes can be 0 to 2.
• For each payload byte, wait for falling edge of RDY before writing the byte into the DATA register.
• The optional CRC field ends the packet. Its length is programmable 0, 1 or 2 bytes by the Sel_CRC[1:0].



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