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TLV320AIC3204: Microphone sometimes does not produce audio

Achim Siersch
Prodigy 80 points
Part Number: TLV320AIC3204


Hello,

I have the following issue with a differential microphone connected to In2_R and In2_L.

(Input and Output only use the left channel)

Sometimes after starting the AIC it does not convert the microphone input signal to data instead it just outputs noise, like no microphone is connected.

Unplugging and plugging the XLR microphone back into the 3 Pin connector resolves this problem for the current session.

Changing Page 1 Reg 52 or 54 from 0x10 to 0x00 and back to 0x10 also fixes the issue for the current session. Just writing 0x10 without setting it to 0x00 does not fix it...

After Starting the AIC the flags in page 1 register 0x42 are 0x6E indicating an Left ADC Overflow. (The microphone is connected to the left PGA). Reading the flag once resets it to 0x60.

I have attached a register dump of the aic while the error is present, the dump shows the same values in the error case as during normal operation.

 

Fullscreen AIC_REGS_DUMP_while_error_to_outside.txt Download 
P 0 Reg 0: 0X00
P 0 Reg 1: 0X00
P 0 Reg 2: 0X60
P 0 Reg 3: 0X00
P 0 Reg 4: 0X03
P 0 Reg 5: 0X91
P 0 Reg 6: 0X07
P 0 Reg 7: 0X06
P 0 Reg 8: 0XDA
P 0 Reg 9: 0X00
P 0 Reg 10: 0X00
P 0 Reg 11: 0X86
P 0 Reg 12: 0X87
P 0 Reg 13: 0X00
P 0 Reg 14: 0X80
P 0 Reg 15: 0X02
P 0 Reg 16: 0X00
P 0 Reg 17: 0X08
P 0 Reg 18: 0X86
P 0 Reg 19: 0X87
P 0 Reg 20: 0X80
P 0 Reg 21: 0X01
P 0 Reg 22: 0X00
P 0 Reg 23: 0X04
P 0 Reg 24: 0X00
P 0 Reg 25: 0X00
P 0 Reg 26: 0X01
P 0 Reg 27: 0X00
P 0 Reg 28: 0X00
P 0 Reg 29: 0X00
P 0 Reg 30: 0X9C
P 0 Reg 31: 0X00
P 0 Reg 32: 0X00
P 0 Reg 33: 0X00
P 0 Reg 34: 0X00
P 0 Reg 35: 0X00
P 0 Reg 36: 0XCC
P 0 Reg 37: 0XCC
P 0 Reg 38: 0X11
P 0 Reg 39: 0X00
P 0 Reg 40: 0X00
P 0 Reg 41: 0X00
P 0 Reg 42: 0X6A
P 0 Reg 43: 0X00
P 0 Reg 44: 0X00
P 0 Reg 45: 0X00
P 0 Reg 46: 0X00
P 0 Reg 47: 0X00
P 0 Reg 48: 0X00
P 0 Reg 49: 0X00
P 0 Reg 50: 0X00
P 0 Reg 51: 0X00
P 0 Reg 52: 0X00
P 0 Reg 53: 0X12
P 0 Reg 54: 0X02
P 0 Reg 55: 0X02
P 0 Reg 56: 0X02
P 0 Reg 57: 0X00
P 0 Reg 58: 0X00
P 0 Reg 59: 0X00
P 0 Reg 60: 0X01
P 0 Reg 61: 0X01
P 0 Reg 62: 0X00
P 0 Reg 63: 0XD4
P 0 Reg 64: 0X00
P 0 Reg 65: 0X00
P 0 Reg 66: 0X00
P 0 Reg 67: 0X00
P 0 Reg 68: 0X00
P 0 Reg 69: 0X38
P 0 Reg 70: 0X00
P 0 Reg 71: 0X00
P 0 Reg 72: 0X00
P 0 Reg 73: 0X00
P 0 Reg 74: 0X00
P 0 Reg 75: 0XEE
P 0 Reg 76: 0X10
P 0 Reg 77: 0XD8
P 0 Reg 78: 0X7E
P 0 Reg 79: 0XE3
P 0 Reg 80: 0X00
P 0 Reg 81: 0XC0
P 0 Reg 82: 0X00
P 0 Reg 83: 0X00
P 0 Reg 84: 0X00
P 0 Reg 85: 0X00
P 0 Reg 86: 0X00
P 0 Reg 87: 0X00
P 0 Reg 88: 0X55
P 0 Reg 89: 0X40
P 0 Reg 90: 0X40
P 0 Reg 91: 0X00
P 0 Reg 92: 0X00
P 0 Reg 93: 0X00
P 0 Reg 94: 0X00
P 0 Reg 95: 0X00
P 0 Reg 96: 0X50
P 0 Reg 97: 0X00
P 0 Reg 98: 0X00
P 0 Reg 99: 0X00
P 0 Reg 100: 0X00
P 0 Reg 101: 0X00
P 0 Reg 102: 0X00
P 0 Reg 103: 0X00
P 0 Reg 104: 0X00
P 0 Reg 105: 0X00
P 0 Reg 106: 0X00
P 0 Reg 107: 0X00
P 0 Reg 108: 0X00
P 0 Reg 109: 0X00
P 1 Reg 0: 0X01
P 1 Reg 1: 0X08
P 1 Reg 2: 0X01
P 1 Reg 3: 0X00
P 1 Reg 4: 0X00
P 1 Reg 5: 0X00
P 1 Reg 6: 0X00
P 1 Reg 7: 0X00
P 1 Reg 8: 0X00
P 1 Reg 9: 0X0C
P 1 Reg 10: 0X00
P 1 Reg 11: 0X10
P 1 Reg 12: 0X00
P 1 Reg 13: 0X00
P 1 Reg 14: 0X08
P 1 Reg 15: 0X08
P 1 Reg 16: 0X40
P 1 Reg 17: 0X40
P 1 Reg 18: 0X06
P 1 Reg 19: 0X00
P 1 Reg 20: 0X00
P 1 Reg 21: 0X00
P 1 Reg 22: 0X00
P 1 Reg 23: 0X00
P 1 Reg 24: 0X00
P 1 Reg 25: 0X00
P 1 Reg 26: 0X00
P 1 Reg 27: 0X00
P 1 Reg 28: 0X00
P 1 Reg 29: 0X00
P 1 Reg 30: 0X00
P 1 Reg 31: 0X00
P 1 Reg 32: 0X00
P 1 Reg 33: 0X00
P 1 Reg 34: 0X00
P 1 Reg 35: 0X00
P 1 Reg 36: 0X00
P 1 Reg 37: 0X00
P 1 Reg 38: 0X00
P 1 Reg 39: 0X00
P 1 Reg 40: 0X00
P 1 Reg 41: 0X00
P 1 Reg 42: 0X00
P 1 Reg 43: 0X00
P 1 Reg 44: 0X00
P 1 Reg 45: 0X00
P 1 Reg 46: 0X00
P 1 Reg 47: 0X00
P 1 Reg 48: 0X00
P 1 Reg 49: 0X00
P 1 Reg 50: 0X00
P 1 Reg 51: 0X48
P 1 Reg 52: 0X10
P 1 Reg 53: 0X00
P 1 Reg 54: 0X10
P 1 Reg 55: 0XC0
P 1 Reg 56: 0X00
P 1 Reg 57: 0XC0
P 1 Reg 58: 0X00
P 1 Reg 59: 0X55
P 1 Reg 60: 0X00
P 1 Reg 61: 0X00
P 1 Reg 62: 0X03
P 1 Reg 63: 0X30
P 1 Reg 64: 0X00
P 1 Reg 65: 0X00
P 1 Reg 66: 0X00
P 1 Reg 67: 0X00
P 1 Reg 68: 0X00
P 1 Reg 69: 0X00
P 1 Reg 70: 0X00
P 1 Reg 71: 0X00
P 1 Reg 72: 0X00
P 1 Reg 73: 0X00
P 1 Reg 74: 0X00
P 1 Reg 75: 0X00
P 1 Reg 76: 0X00
P 1 Reg 77: 0X00
P 1 Reg 78: 0X00
P 1 Reg 79: 0X00
P 1 Reg 80: 0X00
P 1 Reg 81: 0X00
P 1 Reg 82: 0X00
P 1 Reg 83: 0X00
P 1 Reg 84: 0X00
P 1 Reg 85: 0X00
P 1 Reg 86: 0X00
P 1 Reg 87: 0X00
P 1 Reg 88: 0X00
P 1 Reg 89: 0X00
P 1 Reg 90: 0X00
P 1 Reg 91: 0X00
P 1 Reg 92: 0X00
P 1 Reg 93: 0X00
P 1 Reg 94: 0X00
P 1 Reg 95: 0X00
P 1 Reg 96: 0X00
P 1 Reg 97: 0X00
P 1 Reg 98: 0X00
P 1 Reg 99: 0X00
P 1 Reg 100: 0X00
P 1 Reg 101: 0X00
P 1 Reg 102: 0X00
P 1 Reg 103: 0X00
P 1 Reg 104: 0X00
P 1 Reg 105: 0X00
P 1 Reg 106: 0X00
P 1 Reg 107: 0X00
P 1 Reg 108: 0X00
P 1 Reg 109: 0X00
P 1 Reg 110: 0X00
P 1 Reg 111: 0X00
P 1 Reg 112: 0X00
P 1 Reg 113: 0X00
P 1 Reg 114: 0X00
P 1 Reg 115: 0X00
P 1 Reg 116: 0X00
P 1 Reg 117: 0X00
P 1 Reg 118: 0X00
P 1 Reg 119: 0X00
P 1 Reg 120: 0X00
P 1 Reg 121: 0X00
P 1 Reg 122: 0X00
P 1 Reg 123: 0X00
P 8 Reg 0: 0X08
P 8 Reg 1: 0X00
P 8 Reg 2: 0X00
P 8 Reg 3: 0X00
P 8 Reg 4: 0X00
P 8 Reg 5: 0X00
P 8 Reg 6: 0X00
P 8 Reg 7: 0X00
P 8 Reg 8: 0X00
P 8 Reg 9: 0X00
P 8 Reg 10: 0X00
P 8 Reg 11: 0X00
P 8 Reg 12: 0X00
P 8 Reg 13: 0X00
P 8 Reg 14: 0X00
P 8 Reg 15: 0X00
P 8 Reg 16: 0X00
P 8 Reg 17: 0X00
P 8 Reg 18: 0X00
P 8 Reg 19: 0X00
P 8 Reg 20: 0X00
P 8 Reg 21: 0X00
P 8 Reg 22: 0X00
P 8 Reg 23: 0X00
P 8 Reg 24: 0X00
P 8 Reg 25: 0X00
P 8 Reg 26: 0X00
P 8 Reg 27: 0X00
P 8 Reg 28: 0X00
P 8 Reg 29: 0X00
P 8 Reg 30: 0X00
P 8 Reg 31: 0X00
P 8 Reg 32: 0X00
P 8 Reg 33: 0X00
P 8 Reg 34: 0X00
P 8 Reg 35: 0X00
P 8 Reg 36: 0X00
P 8 Reg 37: 0X00
P 8 Reg 38: 0X00
P 8 Reg 39: 0X00
P 8 Reg 40: 0X00
P 8 Reg 41: 0X00
P 8 Reg 42: 0X00
P 8 Reg 43: 0X00
P 8 Reg 44: 0X00
P 8 Reg 45: 0X00
P 8 Reg 46: 0X00
P 8 Reg 47: 0X00
P 8 Reg 48: 0X00
P 8 Reg 49: 0X00
P 8 Reg 50: 0X00
P 8 Reg 51: 0X00
P 8 Reg 52: 0X00
P 8 Reg 53: 0X00
P 8 Reg 54: 0X00
P 8 Reg 55: 0X00
P 8 Reg 56: 0X00
P 8 Reg 57: 0X00
P 8 Reg 58: 0X00
P 8 Reg 59: 0X00
P 8 Reg 60: 0X00
P 8 Reg 61: 0X00
P 8 Reg 62: 0X00
P 8 Reg 63: 0X00
P 8 Reg 64: 0X00
P 8 Reg 65: 0X00
P 8 Reg 66: 0X00
P 8 Reg 67: 0X00
P 8 Reg 68: 0X00
P 8 Reg 69: 0X00
P 8 Reg 70: 0X00
P 8 Reg 71: 0X00
P 8 Reg 72: 0X00
P 8 Reg 73: 0X00
P 8 Reg 74: 0X00
P 8 Reg 75: 0X00
P 8 Reg 76: 0X00
P 8 Reg 77: 0X00
P 8 Reg 78: 0X00
P 8 Reg 79: 0X00
P 8 Reg 80: 0X00
P 8 Reg 81: 0X00
P 8 Reg 82: 0X00
P 8 Reg 83: 0X00
P 8 Reg 84: 0X00
P 8 Reg 85: 0X00
P 8 Reg 86: 0X00
P 8 Reg 87: 0X00
P 8 Reg 88: 0X00
P 8 Reg 89: 0X00
P 8 Reg 90: 0X00
P 8 Reg 91: 0X00
P 8 Reg 92: 0X00
P 8 Reg 93: 0X00
P 8 Reg 94: 0X00
P 8 Reg 95: 0X00
P 8 Reg 96: 0X00
P 8 Reg 97: 0X00
P 8 Reg 98: 0X00
P 8 Reg 99: 0X00
P 8 Reg 100: 0X00
P 8 Reg 101: 0X00
P 8 Reg 102: 0X00
P 8 Reg 103: 0X00
P 8 Reg 104: 0X00
P 8 Reg 105: 0X00
P 8 Reg 106: 0X00
P 8 Reg 107: 0X00
P 8 Reg 108: 0X00
P 8 Reg 109: 0X00
P 8 Reg 110: 0X00
P 8 Reg 111: 0X00
P 8 Reg 112: 0X00
P 8 Reg 113: 0X00
P 8 Reg 114: 0X00
P 8 Reg 115: 0X00
P 8 Reg 116: 0X00
P 8 Reg 117: 0X00
P 8 Reg 118: 0X00
P 8 Reg 119: 0X00
P 8 Reg 120: 0X00
P 8 Reg 121: 0X00
P 8 Reg 122: 0X00
P 8 Reg 123: 0X00
P 8 Reg 124: 0X00
P 8 Reg 125: 0X00
P 8 Reg 126: 0X00
P 8 Reg 127: 0X00
P 44 Reg 0: 0X2C
P 44 Reg 1: 0X00
P 44 Reg 2: 0X00
P 44 Reg 3: 0X00
P 44 Reg 4: 0X00
P 44 Reg 5: 0X00
P 44 Reg 6: 0X00
P 44 Reg 7: 0X00
P 44 Reg 8: 0X00
P 44 Reg 9: 0X00
P 44 Reg 10: 0X00
P 44 Reg 11: 0X00
P 44 Reg 12: 0X00
P 44 Reg 13: 0X00
P 44 Reg 14: 0X00
P 44 Reg 15: 0X00
P 44 Reg 16: 0X00
P 44 Reg 17: 0X00
P 44 Reg 18: 0X00
P 44 Reg 19: 0X00
P 44 Reg 20: 0X00
P 44 Reg 21: 0X00
P 44 Reg 22: 0X00
P 44 Reg 23: 0X00
P 44 Reg 24: 0X00
P 44 Reg 25: 0X00
P 44 Reg 26: 0X00
P 44 Reg 27: 0X00
P 44 Reg 28: 0X00
P 44 Reg 29: 0X00
P 44 Reg 30: 0X00
P 44 Reg 31: 0X00
P 44 Reg 32: 0X00
P 44 Reg 33: 0X00
P 44 Reg 34: 0X00
P 44 Reg 35: 0X00
P 44 Reg 36: 0X00
P 44 Reg 37: 0X00
P 44 Reg 38: 0X00
P 44 Reg 39: 0X00
P 44 Reg 40: 0X00
P 44 Reg 41: 0X00
P 44 Reg 42: 0X00
P 44 Reg 43: 0X00
P 44 Reg 44: 0X00
P 44 Reg 45: 0X00
P 44 Reg 46: 0X00
P 44 Reg 47: 0X00
P 44 Reg 48: 0X00
P 44 Reg 49: 0X00
P 44 Reg 50: 0X00
P 44 Reg 51: 0X00
P 44 Reg 52: 0X00
P 44 Reg 53: 0X00
P 44 Reg 54: 0X00
P 44 Reg 55: 0X00
P 44 Reg 56: 0X00
P 44 Reg 57: 0X00
P 44 Reg 58: 0X00
P 44 Reg 59: 0X00
P 44 Reg 60: 0X00
P 44 Reg 61: 0X00
P 44 Reg 62: 0X00
P 44 Reg 63: 0X00
P 44 Reg 64: 0X00
P 44 Reg 65: 0X00
P 44 Reg 66: 0X00
P 44 Reg 67: 0X00
P 44 Reg 68: 0X00
P 44 Reg 69: 0X00
P 44 Reg 70: 0X00
P 44 Reg 71: 0X00
P 44 Reg 72: 0X00
P 44 Reg 73: 0X00
P 44 Reg 74: 0X00
P 44 Reg 75: 0X00
P 44 Reg 76: 0X00
P 44 Reg 77: 0X00
P 44 Reg 78: 0X00
P 44 Reg 79: 0X00
P 44 Reg 80: 0X00
P 44 Reg 81: 0X00
P 44 Reg 82: 0X00
P 44 Reg 83: 0X00
P 44 Reg 84: 0X00
P 44 Reg 85: 0X00
P 44 Reg 86: 0X00
P 44 Reg 87: 0X00
P 44 Reg 88: 0X00
P 44 Reg 89: 0X00
P 44 Reg 90: 0X00
P 44 Reg 91: 0X00
P 44 Reg 92: 0X00
P 44 Reg 93: 0X00
P 44 Reg 94: 0X00
P 44 Reg 95: 0X00
P 44 Reg 96: 0X00
P 44 Reg 97: 0X00
P 44 Reg 98: 0X00
P 44 Reg 99: 0X00
P 44 Reg 100: 0X00
P 44 Reg 101: 0X00
P 44 Reg 102: 0X00
P 44 Reg 103: 0X00
P 44 Reg 104: 0X00
P 44 Reg 105: 0X00
P 44 Reg 106: 0X00
P 44 Reg 107: 0X00
P 44 Reg 108: 0X00
P 44 Reg 109: 0X00
P 44 Reg 110: 0X00
P 44 Reg 111: 0X00
P 44 Reg 112: 0X00
P 44 Reg 113: 0X00
P 44 Reg 114: 0X00
P 44 Reg 115: 0X00
P 44 Reg 116: 0X00
P 44 Reg 117: 0X00
P 44 Reg 118: 0X00
P 44 Reg 119: 0X00
P 44 Reg 120: 0X00
P 44 Reg 121: 0X00
P 44 Reg 122: 0X00
P 44 Reg 123: 0X00
P 44 Reg 124: 0X00
P 44 Reg 125: 0X00
P 44 Reg 126: 0X00
P 44 Reg 127: 0X00

I would very much applicate any help in solving this issue.

Achim S.

  • 0
    TI__Mastermind 22950 points

    Hello Achim,

    Thanks for providing the register dump. Can you also provide the relevant portion of the schematic?

    Regards,

    Aaron 

  • 0 in reply to Aaron Estrada
    Prodigy 80 points

    Hello Aaron,

    apollogys for the late replay,

    here is the relevant section of the scematic:

    We use the JB30 Microphone jb-systems.eu/jb30

    The unused audio inputs are tied together and ac connected to GND via a 300nF capacitor.

    The before mentioned temporary fix by unplugging and plugging the microphone back in does only work when the mic-bias voltage is connected to the microphone.

    We don't use the bias voltage with this microphone since it is not necessary for this type (moving coil dynamic element). The problem persists with or without connected mic-bias.

    Regards,

    Achim

  • 0 in reply to Achim Siersch
    TI__Mastermind 22950 points

    Hello Achim,

    An overflow indicates saturation of the ADC and may be why the noise may be emitting. Can you try and lower the MICPGA gain and see if this affects the noise? This can be done in P1 Reg. 59.

    Regards,

    Aaron