AN726 データシートの表示（PDF） - Silicon Laboratories

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AN726

UTILITY CLASS-D TOOLSTICK USER’S GUIDE

Silicon Laboratories 

AN726

3.1. Stereo Jack Input Mode

The default mode of the Class-D ToolStick is stereo jack input mode, indicated by blue LED DS1. To play sound in

this mode, connect any input source (MP3 player, phone, etc.) to the J1 stereo jack. The volume level of the input

device should be as high as possible without causing saturation, which the red LED (DS8) indicates.

3.2. USB Input/Output Mode

In USB mode, the board plays sound from the USB host PC or records sound from the board microphone (MK1)

and sends it up to the PC. To use the board in this mode, connect the Device USB connector (J2) to the host PC

and press the MODE button until blue LED DS2 turns on. The board should appear as the Utility Class-D

ToolStick in Device Manager once it’s properly enumerated as a USB Audio device.

To select the Class-D Audio device as the Playback or Recording source in Windows 7, right-click on the Volume

Mixer icon in the System Tray and select either Playback devices or Recording devices. In the Playback tab of

the dialog, select the Utility Class-D ToolStick and press the Set Default button as shown in Figure 3. The

settings for the device can be selected using the Properties button in this tab.

Figure 3. Configuring the USB Utility Class-D ToolStick as the Playback or Recording Device

In the Recording tab of the dialog, select the Utility Class-D ToolStick microphone and press the Set Default

button. This will open an interface to the microphone and will display the recorded input volume to the right of the

device name. If this volume is not registering sounds, press the Properties button to configure the microphone

volume.

Once configured, any program on the PC should output to the Class-D ToolStick device. Ensure that the volume

levels in the program and Volume Mixer are set to appropriate levels. If the device volume settings are not affecting

the Class-D board, click the expansion button below the Speakers icon and select the Speakers (Utility Class-D

ToolStick) as shown in Figure 4.

When recording, the red LED (DS8) indicates when the microphone input saturates.

Note: As long as a recording interface is open (i.e. Volume Mixer Recording devices dialog or a recording program open), the

Class-D ToolStick prevents the user from switching the operation mode. This is due to potential synchronization issues

when switching between different modes and sending data up to the host PC. To switch the mode, close the Volume

Mixer or the recording program.

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