Operation
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•
Save Script can record the current register values. Select Save Script >> Click the folder icon to
browse to the place where you want to save the script >> name the file in text format, then select
OK to save.
•
Load Script can load the previously saved script to program the entire register file. Select Load
Script >> Click the folder icon to browse to the place where the script is located >> Select the file
then click OK >> Click Load.
•
I2C interface can program individual register value of TPA2028D1. Select I
2
C Interface >> I
2
C
address is xB0, which is the address of TPA2028D1. Device address is from 1 to 7, which is the
register address of TPA2028D1.
2.1.4
Shutdown Control
The TPA2028D1 EVM provides independent hardware shutdown controls for the Class-D power amplifier
and the USB controller.
1. Press and hold push button S1 to shutdown TPA2028D1. Release S1 to activate TPA2028D1.
2. Press and hold push button S2 to shutdown the USB controller. Release S2 to activate the USB
controller.
2.2
Quick Start List When Connected to Existing Circuits With I
2
C Controls
The TPA2028D1YZFEVM can be easily connected to existing circuits with I
2
C controls. Connections to the
EVM module can be made using banana plugs for the power supply. The inputs accept standard RCA
plugs and the outputs accept banana connectors.
2.2.1
Evaluation Module Preparations
1. Ensure that all external power sources are set to OFF.
2. Install shunts in jumpers JP4.
3. Remove shunts between J1 and J3 and connect I
2
C controls to J1 as shown in
Figure 5
.
Figure 5. Connect I
2
C Controls to JP3
4. Install shunts in jumpers JP2 when single-ended audio input is used; this ties IN– to ground.
5. Remove USBPWR.
6. Connect an external regulated power supply adjusted for 2.5 V–5.5 V to the VDD and GND banana
jacks, taking care to observe marked polarity.
7. Connect audio source to IN.
8. Connect speakers (8
Ω
to 32
Ω
) to the output banana jacks OUTP and OUTM.
9. Turn on power supply.
6
TPA2028D1YZFEVM
SLOU283 – February 2010
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