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MC13192 Scheda tecnica(PDF) 5 Page - Freescale Semiconductor, Inc

Il numero della parte MC13192
Spiegazioni elettronici  2.4 GHz Low Power Transceiver for the IEEE짰 802.15.4 Standard
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Produttore elettronici  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

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Data Transfer Modes
MC13192 Technical Data, Rev. 3.2
Freescale Semiconductor
5
4
Data Transfer Modes
The MC13192 has two data transfer modes:
1. Packet Mode — Data is buffered in on-chip RAM
2. Streaming Mode — Data is processed word-by-word
The Freescale 802.15.4 MAC software only supports the streaming mode of data transfer. For proprietary
applications, packet mode can be used to conserve MCU resources.
4.1
Packet Structure
Figure 3 shows the packet structure of the MC13192. Payloads of up to 125 bytes are supported. The
MC13192 adds a four-byte preamble, a one-byte Start of Frame Delimiter (SFD), and a one-byte Frame
Length Indicator (FLI) before the data. A two-byte Frame Check Sequence (FCS) is calculated and
appended to the end of the data.
Figure 3. MC13192 Packet Structure
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 back end 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 MC13192 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 MC13192 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.
Preamble
SFD
FLI
Payload Data
FCS
4 bytes
1 byte
1 byte
125 bytes maximum
2 bytes


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