Why my aic26 doesn't work?

boomh

Other Parts Discussed in Thread: TLV320AIC26

I have designed a circuit with AIC26, but it doesn't work completely. the power up sequence is as follows:
1,power up IOVDD firstly.(if this is a wrong step? but after I correct the mistake, the same result).
2,power up DVDD,AVDD,DRVDD simultaneously;(while the reset pin is 1 or 0 , all the same result)
2,PWD=1;
3,reset=0; reset=1; (genurate a reset pulse)
(by now, if the voltage of MICBIAS pin should be 2.5v?, but the voltage of my board is 0v)
4,13MHz MCLK clock send out.
...
and I cann't read anything from the spi interface(oxFFFF).
Can anybody give me some advice? Thanks !

over 13 years ago

0 Daniel Katz over 13 years ago

TI__Intellectual 1450 points

Hi Bo,

We'd love to help. Could you provide your schematic and registers?

Regards,

0 boomh over 13 years ago in reply to Daniel Katz

Prodigy 195 points

Hi DK,
   Here is the schematic and maybe I have never optain the chance to set registers.
   here is part of my program.
=======================================
void Init_AIC26(void)
{

   //-----------PWD ON
    PC_AUDIO = 1;
    SYNC = 1;

//-----------RESET
AUDIO_RST = 0;
AUDIO_RST = 1;

   //-----------MCLK
   Set_Timer4(1);
   TIMER4_RUN(TRUE);
   //------------- the following code is for test , I begin to power off AIC26 .

   TIMER4_RUN(FALSE);
     Set_Timer4(0);
     //
     P0SEL &= 0xfe;
     SYNC = 0;
     PC_AUDIO = 0;
   //------------- the code up is for test , I begin to power off AIC26 .


   //-----------REG

   CODEC_control_data = 0xBB00;   //Reset all TLV320AIC26 registers
   AIC26_Write( RESET_CONTROL , CODEC_control_data);

   CODEC_control_data = 0x003F;   //highpass disabled, single ended MIC, 16bit,i2s,DAC/ADC Sampling Rate=Fsref/6 = 8 kHz
   AIC26_Write( AUDIO_CONTROL_1 , CODEC_control_data);

   CODEC_control_data = 0x3401;   //ADC Channel not muted,ADC PGA = 26 dB,AGC Target Level = -5.5 dB, AGC is on , ---3400???
   AIC26_Write( ADC_GAIN_CONTROL, CODEC_control_data);

   CODEC_control_data = 0x0000;   //left right on, 0DB,
   AIC26_Write( DAC_GAIN_CONTROL, CODEC_control_data);

   CODEC_control_data = 0xC580;   //Analog sidetone muted,Digital sidetone muted.
   AIC26_Write(SIDETONE_CONTROL, CODEC_control_data);

   CODEC_control_data = 0xC410;   //Keyclick enabled, others be default. ---44F0
   AIC26_Write( AUDIO_CONTROL_2 , CODEC_control_data);

   CODEC_control_data = 0x2020;   //powered up CODEC/ADC/DAC，VGND ON，2.5V BIAS，ADWS pin acts as ADC Word.Select
   AIC26_Write( POWER_CONTROL , CODEC_control_data);

   CODEC_control_data = 0x3430;   //44.1 kHz，256-s data transfer mode，slave codec，---3430???
   AIC26_Write( AUDIO_CONTROL_3 , CODEC_control_data);

   //PLL_PROGRAMMABILITY_1, 0x911C;

   //PLL_PROGRAMMABILITY_2, 0x57C8

   CODEC_control_data = 0x8030; //default ---8030
   AIC26_Write( AUDIO_CONTROL_5 , CODEC_control_data);
   //----------- I try to read register , but failed.

    while (1){

      AIC26_Read(BAT1_VALUE);
      //AIC26_Write( RESET_CONTROL , 0x55aa);
      delay_ms(1);
   }

   P0SEL |= 0x01;              //SYNC RESCURE
}

====================================================
Regards,

BO.

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Why my aic26 doesn't work?