SLAAEG7 April   2024 TAC5111 , TAC5111-Q1 , TAC5112 , TAC5112-Q1 , TAC5211 , TAC5212 , TAC5212-Q1 , TAD5112 , TAD5112-Q1 , TAD5212 , TAD5212-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Headset Plugs and Connection Diagrams
    1. 1.1 Part I: Pseudo-Differential (Capacitor-less) Headset Output Configuration
      1. 1.1.1 Detection Block, Capacitor-less Interface
      2. 1.1.2 How to Determine the Comparator Threshold V1 and V2 (Capacitor-less Interface)
      3. 1.1.3 How Does the Bias Voltage Vary With Detection Mode?
      4. 1.1.4 Detection Sequence – Capacitor-less Interface
    2. 1.2 Part II: AC-Coupled Stereo Headset Output Configuration – Capacitor Interface
      1. 1.2.1 Detection Block – Capacitor Interface
      2. 1.2.2 How to Determine the Comparator Threshold V1 and V2 – Capacitor Interface
      3. 1.2.3 How Does the Bias Voltage Change With Detection Mode?
      4. 1.2.4 Detection Sequence – Capacitor Interface
  5. 2Example for a Pseudo-Differential (Capacitor-less) Output Configuration
  6. 3Example for an AC-Coupled (Capacitor) Output Configuration
  7. 4Flowchart for Pseudo-Differential (Capacitor-less) Output Configuration
  8. 5Flowchart for AC-Coupled (Capacitor) Output Configuration
  9. 6Summary
  10. 7References

Abstract

A common feature in most of today's electronic devices – including cell phone, PDAs, notebooks, handheld media players, game systems, and so on, 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 the type.

The TAx5x1x 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 note 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 TAD5212, TAD5112, TAC5212, TAC5112, TAC5211, TAC5111, TAD5212-Q1, TAD5112-Q1, TAC5212-Q1, TAC5112-Q1, and TAC5111-Q1