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TLV320ADC3101: Adding SPH0645LM4H (digital mic) to the BT-MSPAUDSOURCE

David Mrozinski
Prodigy 60 points
Part Number: TLV320ADC3101

Can someone comment on the possibility of adding a digital mic like the SPH0645LM4h to the BT-MSPAUDSOURCE evaluation board.  I can see from the documents that the TLV320 had digital inputs.  I am new to TI products so I was hoping to get a little direction on this.  I assume that I need to make configuration changes to the TLV320 and possibly some firmware changes in the MSP430.

Any comments or suggestions would be greatly appreciated.

Thanks

Dave

  • 0
    TI__Guru 57800 points

    Hi, David,

    The ADC3101 effectively features digital mic support. The Digital mic clock and data signals should be connected to GPIO1 and GPIO2 of the ADC; In the evaluation board you mention, these pins are floating, what would make it difficult to connect the digital mic to the ADC. One thing to mention is that the digital mic you are referring to has an I²S output, unlike the typical PDM format of the digital mics (which is actually the format supported by the ADC3101). If an I²S mic is used, the ADC3101 could be bypassed as the output of the mic can directly be tied to the processor.

    In case you are able to connect a generic Digital mic to the ADC3101 GPIOs, you will also need to configure the device to use the digital mics instead of the analog inputs. This can be achieved by changing below registers of the ADC3101.

    #Digital Microphone Setting
    Register 0x00: 0x00 #Select Page 0
    Register 0x33: 0x28 #Select DMCLK pin as Digital Microphone clock
    Register 0x34: 0x04 #Select DMDIN pin as digital mic data in
    Register 0x51: 0xCC #Turn ADCs on and Enable Digital Microphone
    Register 0x52: 0x00 #Unmute both ADCs

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Prodigy 60 points
    Wondering if you could confirm something for me. Taking your comment about the mic I noted is I2S output, I took another look at the schematic for the BT-MSPAUDSOURCE. It appears there are 3 jumpers in the in the traces from pin 1, 2 and 3 of the TLV320. These are DOUT, WCLK and BCLK. With the jumpers removed, it looks like I may be able to connect the mic to the evaluation board at these points. This would connect the I2S mic directly to the MSP430, I think.

    If you wouldn’t mind I would appreciate your thoughts. Thank you very much for the replies,
    Dave
  • 0 in reply to David Mrozinski
    TI__Guru 57800 points

    Hi, Dave,

    I noticed you posted the same question in a new thread, please follow-up there:

    TLV320ADC3101: SPH6045 digital mic and BT-MSPAUDSOURCE

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer