Datasheet

Micbias

MICBIAS

HPOUT

VOL/MICDET

Micpga

Hpout

S0403-01

TLV320AIC3120

www.ti.com

SLAS653A –FEBRUARY 2010–REVISED MAY 2012

Script

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# DAC => 12 db gain mono

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# DAC => DRC Enabled, Threshold = -24 db, Hysteresis = 3 dB

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# DRC Hold = 0 ms, Rate of Changes of Gain = 0.5 dB/Fs'

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#Attack Rate = 1.9531e-4 dB/Frame , DRC Decay Rate =2.4414e-5 dB/Frame

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# DRC HPF

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# DRC LPF

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5.6.4.7 Headset Detection

The TLV320AIC3120 includes extensive capability to monitor a headphone, microphone, or headset jack,

to determine if a plug has been inserted into the jack, and then determine what type of

headset/headphone is wired to the plug. The device also includes the capability to detect a button press,

even, for example, when starting calls on mobile phones with headsets. Figure 5-32 shows the circuit

configuration to enable this feature.

Figure 5-32. Jack Connections for Headset Detection

This feature is enabled by programming page 0 / register 67, bit D1. In order to avoid false detections due

to mechanical vibrations in headset jacks or microphone buttons, a debounce function is provided for

glitch rejection. For the case of headset insertion, a debounce function with a range of 32 ms to 512 ms is

provided. This can be programmed via page 0 / register 67, bits D4–D2. For improved button-press

detection, the debounce function has a range of 8 ms to 32 ms by programming page 0 / register 67, bits

D1–D0.

The TLV320AIC3120 also provides feedback to the user when a button press or a headset

insertion/removal event is detected through register-readable flags or through an interrupt on the I/O pins.

The value in page 0 / register 46, bits D5–D4 provides the instantaneous state of button press and

headset insertion. Page 0 / register 44, bit D5 is a sticky (latched) flag that is set when the button-press

event is detected. Page 0 / register 44, bit D4 is a sticky flag which is set when the headset insertion or

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