ABSTRACT
A common feature in most of today's electronic devices – including cell phone, PDAs, notebooks,
handheld media players, game systems, etc. – is the provision for connecting to external accessories. The
devices therefore include dedicated logic circuitry that can detect not only the presence of an accessory,
but also its type.
The TLV320AIC33 and TLV320AIC3101/4/5/6 family includes extensive capability to monitor a
headphone, microphone (mic), or headset jack, determine if an audio plug has been inserted, and then
detect what type of headset is wired to the plug. This application report mainly discusses the headset
detection scheme for two different headset output configurations: pseudo-differential (capacitor-less)
output, and ac-coupled output. The content of this document applies to the TLV320AIC33 and
TLV320AIC3101/4/5/6 family.