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MC33596 Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc

Part No. MC33596
Description  PLL Tuned UHF Receiver for Data Transfer Applications
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC33596 Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc

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MC33596 Data Sheet, Rev. 4
Receive Mode
Freescale Semiconductor
16
Figure 9. Preamble Definition
11.2.3.2 ID
When clock recovery is done, the data manager verifies if an ID is received. The ID is used to identify a
useful frame to receive. It is also necessary, when the receiver is strobed, to detect an ID in order to stay
in run mode and not miss the frame.
The ID allows selection of the correct device in an RF transmission, as the content has been loaded
previously in the ID register. Its length is variable, defined by the IDL[1:0] bits. The complement of the
ID is also recognized as the identifier.
It is possible to build a tone to form the detection sequence by programming the ID register with a full
sequence of ones or zeroes.
Once the ID is detected, a HEADER will be searched to detect the beginning of the useful data to send on
the SPI port.
See Section 11.2.4, “State Machine in Receive Mode When DME=1” for more details when ID is not
detected when SOE=1 or SOE=0.
NOTES:
1. The AGC settling time pulse can be split over different pulses as long as the overall duration is at least 200
μs.
The 200
μs pulse may be replaced by : (1 bit @ 2400 bps or 2 bits @ 4800 bps or 4 bits @ 9600 bps or 8 bits @ 19200 bps).
2. Table 13 defines the minimum number of Manchester symbols required for the data slicer operation versus the data and average filter cut-off
frequencies.
3. The Manchester 0 symbol can be replaced by a 1.
OOK MODULATION (DSREF = 0)
AGC Settling Time
Clock Recovery
ID
1 Manchester
‘0’ Symbol
OOK MODULATION (DSREF = 1)
AGC Settling Time
Data Slicer Reference Settling Time
Clock Recovery
ID
FSK MODULATION (DSREF = 1)
At Least 3 Manchester
0 Symbols
at Data Rate (2 and 3)
Data Slicer Reference Settling Time
Clock Recovery
At Least 3 Manchester
0 Symbols
at Data Rate (2 and 3)
1 Manchester
0 Symbol
at Data Rate (3)
1 Manchester
0 Symbol
at Data Rate (3)
at Data Rate
ID
1 NRZ >
200 μs (1)
1 NRZ >
200 μs (1)
OOK MODULATION (DSREF = 0)
AGC Settling Time
Clock Recovery
ID
1 Manchester
‘0’ Symbol
OOK MODULATION (DSREF = 1)
AGC Settling Time
Data Slicer Reference Settling Time
Clock Recovery
ID
FSK MODULATION (DSREF = 1)
At Least 3 Manchester
0 Symbols
at Data Rate (2 and 3)
Data Slicer Reference Settling Time
Clock Recovery
At Least 3 Manchester
0 Symbols
at Data Rate (2 and 3)
1 Manchester
0 Symbol
at Data Rate (3)
1 Manchester
0 Symbol
at Data Rate (3)
at Data Rate
ID
1 NRZ >
200 μs (1)
1 NRZ >
200 μs (1)


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