Shunts, Across SCL and SDA
Operation
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Figure 3. Place Shunts Horizontally Across SCL and SDA
4. Ensure that all external power sources are set to OFF.
5. Connect an external regulated power supply adjusted from 2.5 V to 5.5 V to the module VDD (J5) and
GND (J6) banana jacks, taking care to observe the marked polarity.
6. Install shunt in JP1 if DVDD is powered by the 1.8 V regulated supply from the EVM itself. If DVDD is
powered by another supply(between 1.8 V and 3.3 V), remove shunt in JP1 and connect the supply at
header 1 of JP1.
7. HPVDD is set to VDD by default. If HPVDD is powered by another supply (between 2.5 V and 5.5 V),
remove R17 and connect the supply at TP24.
8. Connect audio source as mentioned in step 2.
9. Connect headphones to J4.
10. Connect speakers (8
Ω
to 32
Ω
) to the output (J11, J12 for LOUT and J13, J14 for ROUT). The
speakers can also be connected to J2 and J3 if header connection is available in the speakers.
11. Plug in the USB.
12. Turn on power sources.
13. The TPA2050D4 can also be powered by USB cable if the audio amplifier output power is less than
100mW. Shunt JP9 and remove the power supply at J5 and J6 for USB power option.
14. The following table provides the test points information on the EVM:
Table 2. Test Points Information
Test Point
Description
TP1, TP2, TP3, TP4
OUTR+, OUTR-, OUTL-, OUTL+
TP5, TP6, TP7, TP8
Filtered OUTR+, OUTR-, OUTL-, OUTL+
TP9
HPVSS
TP10
INR_1
TP11
INL_1
TP12
INL_2
TP13
INR_2
T14
HPRIGHT
T15
HPLEFT
TP18
DVDD
TP20
SCL
TP23
SDA
TP24
HPVDD
TP27
VREF
TP19, TP21, TP22, TP25, TP26
GND
TPA2050D4EVM Evaluation Module
4
SLOU206 – July 2008