SBAA600 October   2024 TAA5212 , TAC5111 , TAC5112 , TAC5211 , TAC5212

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Voice Activity Detection
    1. 2.1 VAD Configurations
      1. 2.1.1 User, Auto, Intermediate
      2. 2.1.2 VAD With ADC Recording
      3. 2.1.3 VAD Monitoring Channel
      4. 2.1.4 VAD Interrupt Pin
      5. 2.1.5 MICBIAS Enable During PDM Monitoring
      6. 2.1.6 VAD Clock Configurabilty
    2. 2.2 VAD Parameters
      1. 2.2.1 Initial Learning Period
      2. 2.2.2 Hold Over Counter
      3. 2.2.3 Wakeup Wait
      4. 2.2.4 Threshold
  6. 3VAD Performance Results
  7. 4Examples
  8. 5Summary
  9. 6References

2.1.5 MICBIAS Enable During PDM Monitoring

The MICBIAS output can be enabled or disabled (default) when the VAD is monitoring a PDM channel based on the value of LPAD_CH_SEL[1:0].

As Table 2-7 shows, the MICBIAS enable during PDM recording is controlled using the LPAD_EN_MICBIAS[2] bit of LPAD_CFG1 register (page = 0x01, address = 0x1E).

Table 2-7 MICBIAS Control During VAD Processing on PDM Channels
Bit Field Type Reset Description
2 LPAD_EN_MICBIAS R/W 0b MICBIAS control during VAD processing on a PDM channel.
0d = MICBIAS is disabled during VAD processing on a PDM channels
1d = MICBIAS is enabled during VAD processing on a PDM channel