Operation
7.4
Input and Output Connections
7.4.1
Headphone Input
For headphone amplifier evaluation, connect the left and right signal sources to HPINL (black) and HPINR
(red) RCA input connectors on the EVM.
7.4.2
Microphone Output
For microphone pre-amp and mic-bias evaluation, connect the microphone output available on the
MICOUT (black) RCA connector to the measurement equipment or external amplifier system.
7.4.3
I
2
C Connection
By default, pins SDA and SCL of the TPA6166A2 are driven by the on-board TAS1020B which is
controlled by the GUI running on the PC through the USB. If the EVM is not in this default mode, insert
jumpers between the middle-pin and
USB
pin of the following jumpers: SDA, SCL.
To use an external I
2
C master instead of the on-board TAS1020B, remove the jumpers between the
middle-pin and
USB
pin of jumpers SDA and SCL and connect the external I
2
C signals between the
middle-pin and GND of jumpers SDA and SCL. Ensure that SDA and SCL are not swapped. Ensure that
the I
2
C master does not have pull up resistors or that the I
2
C master’s pull-up resistors pull up SDA and
SCL to 1.8 V. Voltages greater than 1.8 V may cause device damage.
7.4.4
IRQ Connection
By default, the IRQ pin of the TPA6166A2 is connected to the on-board TAS1020B which is controlled by
the GUI running on the PC through the USB. If the EVM is not in this default mode, insert a jumper
between the middle-pin and the
USB
pin of the IRQ jumper.
To stop the IRQ signal from going to the on-board TAS1020B and to process it using an external device,
remove the jumper between the middle-pin and the
USB
pin of jumper IRQ, and connect the middle-pin
and GND of jumper IRQ to the external device. Ensure that IRQ does not have pull-up resistors or that the
I
2
C master’s pull-up resistors pull up IRQ to 1.8 V. Voltages greater than 1.8 V may cause device damage.
7
SLOU381 – March 2014
TPA6166A2 Multimedia Headset Interface
Copyright © 2014, Texas Instruments Incorporated
