Datasheet

www.ti.com AIC3254 Control Software
4.1.2.4 Headset Detection
The TLV320AIC3254EVM provides two terminal blocks (J8 and J4) that can be used to connect different
types of cellular headset jacks. For proper headset detection, the jack connections must comply with the
figure shown in the Headset Detection section of the datasheet.
The Headset Detection panel provides hardware setup information for a four-conductor stereo + cellular
jack, as seen in Figure 12.
As an example, if stereo headphones are connected to the four-conductor jack, the tip and ring carry the
AC-coupled HPL and HPR signal to the headphone speakers whereas the shield shorts the SCLK/MFP3
pin to ground. This results in a stereo headset detection.
Checking the Enable Polling box displays the headset type at the Headset Type Detected box.
Other flags related to this feature can be accessed at the Status Flags panel.
Figure 12. Headset Detection Panel
4.1.2.5 DC Measurement
Terminal block J3 on the TLV320AIC3254EVM can be used to evaluate the DC measurement feature.
The Information tab provides the hardware setup information.
The Left ADC (V) and Right ADC (V) boxes convert the register data to voltage. The voltage is derived
from the References shown at the upper right corner of the DC Measurement tab. The DC measurement
register data is in 2.22, 2s complement format.
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SLAU264A–October 2008–Revised September 2012 TLV320AIC3254EVM-K
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