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TLV320AIC3106: How to set the TLV320aic3106 to cut down the input through the software setting ?

Andrew Liu74
Intellectual 970 points
Part Number: TLV320AIC3106 
How to set the TLV320aic3106 to not connected , I use the TLV320AIC3106 as several input switch mode, that inclode 1/ line2r single ended ,2/line2L differential  3/mic3L three mic input ,when i set the register as not connected ,it is could get audio date from audio recorder .such as , i set page0/register17 11111111,it also could get audio date from audio recorder software , if i could cut down the connect through the how could set not connected through software setting? if can not ,how could i cut down the recorder ?

  • 0
    TI__Mastermind 30030 points
    Hi Andrew,

    I'm not sure I understand your question.
    If you set page 0 register 17 to 11111111, Mic3L and Mic 3R will be disconnected.
    the inputs can be mixed using R17-R24

    all of the Analog signals get mixed, go through the PGA, and then can be sent directly to the analog outs, but once they go through the ADC the only place they can go is the DOUT.
    so if you want to mix a digital signal from another source, you would have to do that in an external DSP, or something similar. The AIC3106 doesn't support mixing two digital signals

    I hope I understood you correctly, and was able to answer your question, but if not please let me know.
    best regards,
    -Steve Wilson
  • 0 in reply to Steve-Wilson
    Prodigy 70 points
    Hi Steve，

    What Andrew mean is we had tried to set page 0 register 17 to 11111111 for Mic3L and Mic 3R， but we found that the input was still work.
    and when we had been disconnected other route just like Line2L , Line2R and so on. The MIc3L and Mic 3R are disconnected successfully. So
    we want to know, if we need to set other registers when disconnecting Mic3L and Mic3R other than set only register 17 to 11111111.
    This problem had been found when we tried to disconnect other input routes.
    so please help analysis this problem.

    best regards
    Fans
  • 0 in reply to user5220335
    TI__Mastermind 30030 points
    Hello Fans,

    are you certain that you are writing to the correct registers? MIC3L/R is controled with Registers 17 and 18 (left and Right ADC) so you will have to write 0xFF to both if you want to totally disconnect.

    I Just tested on an EVM at my desk and when I set Register 17 and 18 to 0xFF, Mic 3 is off.

    best regards,
    -Steve Wilson
  • 0 in reply to Steve-Wilson
    Prodigy 70 points

    Hi Steve,

    If there are some problem on hardware device, today we find some of boards are ok, but some others are not.

    We tried to read the registers from these  boards, the reg value are correct, but the actual results are not.

    Best Regards

    Fans

  • 0 in reply to user5220335
    TI__Mastermind 30030 points
    Hello Fans,

    I've sent you a connection request, perhaps we can get more details on your application... schematics/layout that sort of thing and see if we can get to the bottom of this. Obviously this is not standard behavior.

    best regards,
    -Steve
  • 0 in reply to Steve-Wilson
    TI__Mastermind 30030 points
    Fans,

    I wanted to check back in with you regarding your problem, as I have not heard from you. Are you still experiencing the same problem? The way that you have described the problem tells me that there is a problem somewhere, as this is not standard behavior for this device, the more information I can get from you the more likely it is that I can help you solve it. let me know if I can be of assistance.
    best regards,
    -Steve Wilson
  • 0 in reply to Steve-Wilson
    TI__Mastermind 30030 points
    if you can send me your register configurations I can perhaps find what the problem is.

    best regards,
    -steve
  • 0 in reply to Steve-Wilson
    Prodigy 70 points

    Hi Steve,
    the following code is used to set input mode, I disconnect all of the inputs firstly, and then set the required input mode via the parameter "int type" of function setAudioInput.

    Best Regards
    Fans


    151 void resetInput()
152 {
153     int ret = -1;
154 
155     i2c_write(17, 0xff); //front mic2
156     i2c_write(18, 0xff); //front mic1
157     i2c_write(19, 0xff); //front mic4
158     i2c_write(20, 0xfc); //micphone
159     i2c_write(22, 0xff); //front mic3
160     i2c_write(23, 0xfc); //line in
161 
162     //usb mic
163     ret = init_mixer("2");
164     if(!ret)
165     {
166         setUsbAISwitch(0);
167         close_mixer();
168     }    
169 }                                                                                                                                                                                               
170 
171 void setAudioInput(int type)
172 {
173     char value[4] = {'\0'};
174     int ret = -1;
175 
176     if(type > 3 || type < 0)
177     {
178         ALOGE("set input type invalid\n");
179         return;
180     }
181 
182     ALOGI("reset all input first\n");
183     resetInput();
184 
185     ALOGI("start to set input type\n");
186     switch (type) {
187 
188         case USB_MIC:
189             ret = init_mixer("2");
190             if(!ret)
191             {
192                 setUsbAISwitch(1);
193                 close_mixer();
194             }
195             break;
196         case FRONT_MIC:
197             i2c_write(17, 0x0f);     //MIC3L MIC2
198             i2c_write(18, 0x0f);     //MIC3R MIC1
199             i2c_write(19, 0x07);    //LINE1LP MIC4
200             i2c_write(22, 0x07);    //LINE1RP MIC3
201             break;
202         case LINE_IN:
203             i2c_write(23, 0x4);      //line2r to right adc single_end mode; biased;
204             break;
205         case MICPHONE:
206             i2c_write(20, 0x84);    //line2lp & line2lm differential mode; biased;
207             break;
208         default:
209             ALOGE("unknown input type\n");
210     }
211 
212     sprintf(value, "%d", type);
213     property_set("persist.sw.input.type", value);
214 
215 }



  • 0 in reply to user5220335
    TI__Mastermind 30030 points

    Fans,

    There is an Error in your code

    Line 198 should read  i2c_write(18, 0xf0)

    register 17 has controls for both MIC3L and Mic3R.   so if you write 0x0F to register 17,  Mic3L will be connected to the LEFT PGA mix with input gain =0dB and Mic3R will be disconnected from the LEFT PGA mix

    register 18 has controls for both MIC3L and MIC3R.  so if you write 0x0F to register 18  Mic3L will be connected to the Right PGA mix with input gain =0dB and Mic3R will be disconnected from the Right PGA mix

    if you want to turn on and off MIC3R to the Right PGA mix,  you need to write 0xF0 to register 18. 

    does that makes sense?

    best regards, 

    -STeve

  • 0 in reply to Steve-Wilson
    Prodigy 70 points

    Hi Steve,

    Ok, I'll modify this error in my code,

    But there is another problem about these audio inputs control. If I tried to turn on another audio input(e.g. LINE_IN input) via coding, then MIC3R and MIC3L would be disconnected via setting i2c registers 17 and 18 to 0xff, but I found MICR and MICL were still work. I'm sure that I had unplugged other physical devices(e.g. LINE_IN input devices) except this mic which had been connected to MIC3R and MIC3L. I tried to read registers 17 and 18 , the values had been set to 0xff, but  I can record audio from it., I don't konw why this mics are still work,

    Best Regards

    Fans

  • 0 in reply to user5220335
    TI__Mastermind 30030 points
    Fans,

    The TLC320AIC3106 does not behave this way for me. can you show me all of your I2C register writes to the AIC3106? A schematic would be helpful too.

    -Steve
  • 0 in reply to Steve-Wilson
    Prodigy 70 points

    Hi Steve,

    we just get some new devices from factory，we can close the front mic, probably there is some problem on previous device,  but I find a similar problem on these new devices. If I close all input via calling function resetInputs() mentioned in previous reply, the front mic are really closed, but when I open the register 20 (LINE2l to  Left ADC Control) via set i2c with value 0x84, the front mic can capture audio again with small volume. The front mic are connected to MIC3R/L, they should not be affected by register 20, but I don't know why?

    Best Regards

    Fans

  • 0 in reply to Steve-Wilson
    Prodigy 70 points

    Hi Steve,

    the uploaded file is init code for tlv320aic3106, the setting input code had been written in previous reply.

    Best Regards

    Fans

    tlv320aic3106.c 
    void tlv320_DrvInit(void)
{
    HI_INFO_AIC3X("tlv320_Init\n ");

    tlv320aic31_write(I2C_AIC31, 0x1, 0x80);
    time_delay_us(50);

    /* Mclk = 12.288M,not PLL mode*/
    tlv320aic31_write(I2C_AIC31, 102, 0x32); //if pll,p=r=1,k=8
    tlv320aic31_write(I2C_AIC31, 101, 0x01);
    tlv320aic31_write(I2C_AIC31, 3, 0x10);

    tlv320aic31_write(I2C_AIC31, 2, 0x00);

    //tlv320aic31_write(I2C_AIC31, 10, 0x08);

    tlv320aic31_write(I2C_AIC31, 8, 0x30);

    tlv320aic31_write(I2C_AIC31, 9, 0x27 );  //16bits

    tlv320aic31_write(I2C_AIC31, 12, 0x50);  //0 means disabled

    tlv320aic31_write(I2C_AIC31, 25, 0x06 ); // enable mic bias

    tlv320aic31_write(I2C_AIC31, 15, 0); //Left ADC Control
    tlv320aic31_write(I2C_AIC31, 16, 0); //Right ADC Control

    tlv320aic31_write(I2C_AIC31, 17, 0x0f); //left adc single_end mode, 0dB volume; ena power for mic2
    tlv320aic31_write(I2C_AIC31, 18, 0x0f); //left adc single_end mode, 0dB volume; ena power for mic1
    tlv320aic31_write(I2C_AIC31, 19, 0x07); //left adc single_end mode, 0dB volume; ena power for mic4
    tlv320aic31_write(I2C_AIC31, 20, 0x84); //line2lp & line2lm differential mode; biased 
    tlv320aic31_write(I2C_AIC31, 22, 0x07); //right adc single_end mode, 0dB volume; ena power for mic3
    tlv320aic31_write(I2C_AIC31, 23, 0x04); //line2r to right adc single_end mode, 0dB volume; biased 

    tlv320aic31_write(I2C_AIC31, 28, 0);
    tlv320aic31_write(I2C_AIC31, 31, 0);
    tlv320aic31_write(I2C_AIC31, 26, 0x80);
    tlv320aic31_write(I2C_AIC31, 29, 0x80);

    tlv320aic31_write(I2C_AIC31, 7, 0xa); //set Fsref;dual rate mode or not;D1~D4 set I2S into dac,both dac open
    tlv320aic31_write(I2C_AIC31, 14, 0x80); //high-power outputs for ac-coupled
    tlv320aic31_write(I2C_AIC31, 37, 0xc0);   //left and right dac power
    tlv320aic31_write(I2C_AIC31, 40, 0x80); //Output common-mode voltage 1.65v, disable soft_step volume

    tlv320aic31_write(I2C_AIC31, 41, 0x00); //select DAC_L(R)1 to hi-power;left and right volume dependent controls

    tlv320aic31_write(I2C_AIC31, 42, 0x68); //Output Driver Pop Reduction(medium)

    tlv320aic31_write(I2C_AIC31, 43, 0x08); //left DAC channel not muted;DAC Digital Volume Control(attenuation,adjust value level)
    tlv320aic31_write(I2C_AIC31, 44, 0x08); //right DAC channel not muted;DAC Digital Volume Control(attenuation,adjust value level)

    tlv320aic31_write(I2C_AIC31, 47, 0x80); //DAC_L1 is routed to HPLOUT;Output Stage Volume Control(no attenuation)
    tlv320aic31_write(I2C_AIC31, 64, 0x80); //DAC_L1 is routed to HPROUT;Output Stage Volume Control(no attenuation)

    tlv320aic31_write(I2C_AIC31, 51, 0x9f); //left output level control(enlarge,max);output mute,power;
    tlv320aic31_write(I2C_AIC31, 65, 0x9f); //right output level control(enlarge,max);output mute,power;
    /* enable LEFT_LOP/M and RIGHT_LOP/M */
    tlv320aic31_write(I2C_AIC31, 81, 0x00); //0: PGA_L is not routed to LEFT_LOP/M;
    tlv320aic31_write(I2C_AIC31, 82, 0x80); //0: DAC_L1 is routed to LEFT_LOP/M
    tlv320aic31_write(I2C_AIC31, 86, 0x0b); //left LEFT_LOP level 0dB, un-mute, power up;

    tlv320aic31_write(I2C_AIC31, 91, 0x00); //0: PGA_R is not routed to RIGHT_LOP/M;
    tlv320aic31_write(I2C_AIC31, 92, 0x80); //0: DAC_R1 is routed to RIGHT_LOP/M
    tlv320aic31_write(I2C_AIC31, 93, 0x0b); //left LEFT_LOP level 0dB, un-mute, power up;

}

  • 0 in reply to Steve-Wilson
    Prodigy 70 points
    Hi Steve,

    I found a way to avoid this problem, when I read the register 27 (left AGC control), I found the gain had been set maximum value, so I tried to set the gain to 0x50, then the front mic audio input can be muted almost, if I plug other input device, the recorded volume is ok. So do you think if this resolution can be accepted, thanks.

    Best Regards
    Fans
  • 0 in reply to user5220335
    TI__Mastermind 30030 points

    Fans, 

    The AGC has a wide range functional use.  I recommend reviewing the Datasheet section that covers the AGC, to make sure you understand what it is doing. This is really up to you.  if you really would like to keep the AGC gain at Maximum,  then when you want to turn the microphones off, you should also turn off the AGC.  

    there is also a noise gate that you can use.  My guess is that the AGC is simply boosting the gain,  and a small amount of mic signal is coupling in,  and getting amplified 60dB.   if the noise gate threshold is set to a higher value, this could also solve your issue. 

    -Steve Wilson

  • 0 in reply to Steve-Wilson
    Intellectual 970 points

    Dear Steve 

    Thank you for your help ! as felow accessory is the tlv320aic3106 schematics , plesase help to check if there any wrong ,whicth may cause the issue , many thanks !TLV320AIC3106IRGZR.pdf

  • 0 in reply to Andrew Liu74
    TI__Mastermind 30030 points
    Andrew,

    I apologise for the delayed response.

    R194, 195, R197 and R198 should not be there or should be 0R. (The unused inputs should be AC coupled to gnd)

    you are using quite a few microphones and they all pull current from the micbias pin. You must be sure that the combined current draw doesn't exceed 4ma.


    best regards,
    -Steve Wilson