Operation
7.3
EVM Connections and Power Up
The EVM is configured to power up from the USB by default. If the EVM is not in this mode, ensure that
jumpers are inserted between the middle pin and the
USB
pin of the following jumpers: JP2, JP3 and JP4.
Then, using a micro-USB cable, connect the EVM to a PC running Windows XP or higher.
The EVM powers itself from the USB (5.0 V) and generates 3.0-V and 1.8-V supplies for the TPA6166A2
using on-board voltage regulators as well as a 3.3 V for the TAS1020B chip which is used to convert USB
to I
2
C and vice versa.
Alternatively, to power the TPA6166A2 using external power supplies, use the jumper settings in
It is not possible to power the TAS1020B chip from an external 3.3-V supply.
Table 2. TPA6166A2 Jumper Settings
Jumper
Connect Middle Pin To
Function
JP4
5.0-V
pin of jumper
Use external 5.0-V supply instead of USB power
JP2
3.0-V
pin of jumper
Use external 3.0-V supply instead of 3.0 V from on-board regulator
JP3
1.8-V
pin of jumper
Use external 1.8-V supply instead of 1.8 V from on-board regulator
Once the USB cable is connected to the PC, the I
2
C status indicator in the bottom half of the GUI should
turn green as shown in
Figure 4. Established I
2
C Connection (Shown with Green Indicator Light)
6
TPA6166A2 Multimedia Headset Interface
SLOU381 – March 2014
Copyright © 2014, Texas Instruments Incorporated
