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MC13202 Arkusz danych(PDF) 6 Page - Freescale Semiconductor, Inc

Numer części MC13202
Szczegółowy opis  2.4 GHz Low Power Transceiver for the IEEE 802.15.4 Standard
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Producent  FREESCALE [Freescale Semiconductor, Inc]
Strona internetowa  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC13202 Arkusz danych(HTML) 6 Page - Freescale Semiconductor, Inc

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MC13202 Technical Data, Rev. 1.2
6
Freescale Semiconductor
4.2
Receive Path Description
In the receive signal path, the RF input is converted to low IF In-phase and Quadrature (I & Q) signals
through two down-conversion stages. A Clear Channel Assessment (CCA) can be performed based upon
the baseband energy integrated over a specific time interval. The digital backend performs Differential
Chip Detection (DCD), the correlator “de-spreads” the Direct Sequence Spread Spectrum (DSSS) Offset
QPSK (O-QPSK) signal, determines the symbols and packets, and detects the data.
The preamble, SFD, and FLI are parsed and used to detect the payload data and FCS which are stored in
RAM. A two-byte FCS is calculated on the received data and compared to the FCS value appended to the
transmitted data, which generates a Cyclical Redundancy Check (CRC) result. Link Quality is measured
over a 64 µs period after the packet preamble and stored in RAM.
If the MC13202 is in packet mode, the data is processed as an entire packet. The MCU is notified that an
entire packet has been received via an interrupt.
If the MC13202 is in streaming mode, the MCU is notified by an interrupt on a word-by-word basis.
Figure 4 shows CCA reported power level versus input power. Note that CCA reported power saturates at
about -57 dBm input power which is well above 802.15.4 Standard requirements. Figure 5 shows energy
detection/LQI reported level versus input power.
NOTE
For both graphs, the required 802.15.4 Standard accuracy and range limits
are shown. A 3.5 dBm offset has been programmed into the CCA reporting
level to center the level over temperature in the graphs.
Figure 4. Reported Power Level versus Input Power in CCA Mode
-100
-90
-80
-70
-60
-50
-90
-80
-70
-60
-50
Input Pow er (dBm)
802.15.4 A c curac y
and range Requirements


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