Freescale Semiconductor KIT34825EPEVME, Руководство пользователя

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KIT34825EPEVME Evaluation Board , Rev. 2.0
10 Freescale Semiconductor
Hardware Description
4.4 Audio Accessory with Remote Control
The user may build an additional audio accessory with remote control to work with the evaluation kit. Here
is an example of the audio accessory with remote control. The picture of the top side and the bottom side
are shown in
Figure 7 . The schematic is shown in Figure 8 .
The top side contains five buttons, representing S0 to S4 respectively. These buttons are assigned to
“play/pause”, “previous”, “next”, “volume up”, and “volume down” respectively in the GUI software comes
with the evaluation kit. The assignments are indicated at the lower-left corner with the silk screen, as
shown in
Figure 7 .
The bottom side contains two audio jacks for a microphone and a stereo headphone, a mini-USB
connector, and the ID resistors for the five buttons and the audio accessory. The audio jacks are for
connecting to a regular headphone/microphone combo for computers that is not included in the
evaluation kit but can be easily acquired in any computer accessory store. The mini-USB connector is for
connecting to the mini-USB connector of the evaluation board with a special cable comes with the
evaluation kit.
The board, together with the headphone/microphone combo and the mini-USB cable form an audio
headset with a microphone and a remote control. Users can use such an accessory to evaluate the
feature of the remote control and the simultaneous stereo and the microphone signals.
Top Side of the
Remote Control
Board
Bottom Side of the
Remote Control
Board
The Assignment
of the 5 Buttons
Mini-USB
Connector
Figure 7. The Audio Accessory with Remote Control Buttons