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Operation
Figure 4. Software Interface
NOTE: The TPA2028D1 powers up with the amplifier in software shutdown. To hear an output,
uncheck shutdown.
3. Uncheck and check SPK_EN to place the Class-D output in and out of CHANNEL SHUTDOWN.
4. Click Shutdown to place the TPA2028D1 in and out of SOFTWARE SHUTDOWN.
5. Adjust the Attack Time, Release Time and Hold Time by sliding the bar or clicking the tap in the GUI.
You can also type a value in the box; in that case, the value will be rounded to the closest available
setting.
6. Adjust the Fixed Gain, Maximum Gain and Limiter Level by dragging the bar or clicking the tap in the
GUI. You can also type a value in the box; in that case, the value will be rounded to the closest
available setting.
7. Adjust Compression Ratio and Noise Gate Threshold by clicking the value.
8. The Limiter Power Level can be calculated by selecting the Load Resistance.
9. I2C Status box reports the status of I
2
C communications. An error or failure has occurred if it shows
I2C failure.
10. To read the I
2
C status, click Refresh.
11. Thermal box reports the status of thermal failure. A thermal fault has occurred if it turns red.
12. Click Show Graph to display the AGC transfer function. The transfer function is automatically updated
with the current AGC parameters (fixed gain, maximum gain, limiter level and compression) in GUI.
Click Hide Graph to hide the transfer function.
13. Volume Macro simulates volume control by changing fixed gain, limiter level and maximum gain
simultaneously. Follow the steps below to use the Volume Marco.
• At the top left corner of the GUI, select Volume Macro.
• Slide the volume bar to adjust the volume.
• Click Volume Marco again to go back to GUI.
• Click refresh to update the AGC parameters.
14. The GUI has a built-in I
2
C programming interface. Follow the steps below to use the I
2
C programming
function.
• At the top left corner of the GUI, click File to access the I
2
C programming interface.
5
SLOU283–February 2010 TPA2028D1YZFEVM
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