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Audio Sensor?

Josep Alemany Fruitos
Prodigy 20 points
Other Parts Discussed in Thread: CC2541, TLV320ADC3101

Hi,

I'm developing some solutions using smart bluetooth and I want to know if there is a microphone / audio sensor I can use with the CC2241 sensor tag and in my design solution. I have searching but there are so much information... I'll be interested to know all the sensors I can use with this device. Thanks in advance! Best Regards,

Josep Alemany

  • 0
    Guru 22270 points

    Hello Josep,

    Welcome to the Forum!

    Yes, you can connect an audio sensor to the SensorTag if the sensor has a UART interface.  The Rx and Tx are the only pins that are readily available to the user on the SensorTag.  The Rx pin can also be configured for Timer3.  You would not be able to connect a mic up to it unless you can do a frequency-to-time conversion of the sound.

    The Rx and Tx are also GPIO, so you could bit bang the i2c protocol and connect to an external ADC that has your mic/ sound sensor attached to it, or a i2c audio input ic.  I suppose you could also write code for the i2s protocol as well.

    The CC2541 on its own and in the EM kit does allow you to connect a mic to the ADC, where you can can get voice quality sound as in the Advance Remote Controller.

    Thanks,

  • 0
    TI__Guru 57865 points

    Hey Josep,

    You can use TLV320ADC3101 which we have in an upcoming BLE Voice remote reference design.

    Best Regards

    Joakim

  • 0
    TI__Guru** 106705 points

    Hi Josep,


    Attached is our soon-to-be-released-online reference design for a BLE remote with voice. You can use that as a reference. We are using the SPI as I2S interface to the codec.


    Cheers,

    Fredrik

    3438.CC2541VRC_1_4_0.zip

  • 0 in reply to Fredrik K
    Guru 22270 points

    Hello Joakim, Fredrik,

    It is good to see the ARC reference design is ready.

    For this new design, why was the TLV320ADC3101 chosen over the TLC320AIC3256 which is used in the Portable Audio and Display Solution?

     http://www.ti.com/ww/en/more/solutions/portable-audio-display.shtml.

    The device in the solution offers stereo speaker and headset output.   It would definitely future proof the ARC design.  the only audio from the 3101 looks like it is digital and from understanding it would require further processing (MCU overhead) to connect it up to a headset or small speaker.

    Thanks,

  • 0 in reply to J Lindh
    Prodigy 20 points

    How can I connect it to the Smart Bluetooth chip? I'm not a electronic, I'm a computer programmer but I have develop a lot on assembler an understand a little bit how can it works... Thanks