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

1.2.1 Detection Block – Capacitor Interface

GUID-20231122-SS0I-9R6F-LFR8-QZ6RVK3HZWGK-low.gif Figure 1-8 Detection Block for AC-Coupled (Capacitor) Interface

Comparator C is used to detect headset insertion and removal. However, button press detection becomes active only when headset with mic is detected. Headset insertion and removal detection is always active inside device.

MICDET < V2 Insertion detected
MICDET > V2 No insertion
MICDET > V1 Headset with mic
MICDET < V1 Headset without mic
Given headset with mic is already detected
MICDET > V3 No button press
MICDET < V3 Button press detected

Comparator A is used to differentiate mono headset with mic from stereo headset with mic.