MC72000 Freescale Semiconductor, MC72000 Datasheet - Page 28

• Manufacturer Part Number: MC72000
• Description: Integrated Bluetooth Radio
• Manufacturer: Freescale Semiconductor

Freescale Semiconductor, Inc.
System Description
The program execution in the MC72000 Bluetooth Baseband Controller is predominantly ROM-based,
with internal RAM for data storage, application code, and ROM code patching. However, it is necessary to
download the application software and configuration data into RAM from an external interface. This is
done either as individual files when needed, as a complete image at power up containing all the files from
a host system, or from a low-cost serial EEPROM (four-wire connection) connected to the serial peripheral
interface (SPI).
5.1.2 Baseband Processor
The baseband processor digitally demodulates the signal at the output of the radio discriminator. Rather
than immediately making a threshold decision based on the amplitude of the signal, it analyzes the
waveform shape over more than one symbol before it makes a decision. This feature allows the Maximum
Likelihood Sequence Estimation and Joint Detection algorithms (JD/MLSE) to improve adjacent channel
rejection and signal acquisition. Without the joint detection and MLSE algorithms, it is possible to have
high sensitivity but low throughput because of false/missing acquisitions and high interference. Joint
detection provides simultaneous frequency and timing acquisition on the entire header rather than relying
on just the synchronization portion.
5.1.2.1 Bluetooth Link Controller
The Bluetooth link controller module (BTLC) handles all link controller specific functions.
Raw data can be read from/written to the module, and the BTLC takes care of transmission-related timing,
as well as data signal processing functions like encryption and cyclic redundancy check (CRC)/header
error correction (HEC) generation. Embedded in the BTLC are also the dedicated Bluetooth timers, which
maintain an accurate estimate of time in both the native and the remote module.
A small, dedicated Bluetooth serial peripheral interface controller handles all serial communication with
the radio part of the MC72000 Integrated Bluetooth Radio.
The functionality of the baseband will be elaborated on in Section 8, “Bluetooth Baseband Functionality
Overview.”
5.1.3 Bluetooth Radio
The design is based on Motorola's third-generation Bluetooth architecture that has set the industry standard
for interoperability, complete functionality, and compliance with the Bluetooth specification.
The radio portion of MC72000 exhibits superior RF performance with small size and low cost. A
minimum of external components are required to complete the RF link of a Bluetooth system, while
maintaining superior performance.
5.1.3.1 Receiver
The receiver is a 6 MHz low-IF frequency type using analog image cancellation. The LO is set to either
high-side or low-side injection so that the image will fall within the ISM band when the frequency to be
received is set to edge of the ISM band. The integrated Bluetooth baseband automatically decides the use
of high-side or low-side injection to the receiver, based on the active receive channel. The low-power
integrated LNA and BPF exhibits the excellent sensitivity and noise rejection performance, which is
further improved by the total system solution using the JD/MLSE baseband signal processing.
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MC72000 Advance Information Data Sheet
MOTOROLA
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