Freescale Semiconductor KIT34825EPEVME, Руководство пользователя

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KIT34825EPEVME Evaluation Board , Rev. 2.0
18 Freescale Semiconductor
Using the Evaluation Kit
6 Using the Evaluation Kit
There are two ways of using the evaluation board. The first one is to directly jump connect the signals of
34825 to the customer’s system board. The evaluation board offers the test points of all pins of the IC for
the convenience of such connection. The second way is to use the evaluation kit and a PC and the GUI
software to evaluate or demonstrate the features and the performance of the 34825. The first way is
straight forward and requires no further explanation once the user understand the 34825. This section
describes the second way with a few real examples of using the evaluation kit.
6.1 Setting up the Evaluation Kit
The 34825 requires the baseband signals for the demonstration or evaluation. Those signals can be
easily created with the evaluation kit.
6.1.1 I2C host signals
The I2C host signals are provided by the MCU in the USB-to-I2C interface. Connect the evaluation board
to the PC that runs the GUI software using a USB A-to-B cable, as shown in
Figure 16 . The I2C host
command can be sent from the GUI software via the USB-to-I2C interface. Any interrupt signal from the
34825 can be intercepted by the MCU and forwarded to the GUI software via the USB bus.
Figure 16. The Setup for the KIT34825EPEVME Kit
6.1.2 Audio signals
The audio signals, namely the microphone and the stereo audio signals, can also be obtained from the
PC. Connect the microphone and stereo speaker jacks between the PC and the evaluation board, as
shown in
Figure 16 . When evaluating with an audio accessory, such as the one illustrated in Figure 16 ,
the PC functions as the baseband system to offer a stereo audio output to the 34825 as well as to receive
the microphone signal. The signals will be passed through the 34825 to the external audio accessory.