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TAS5805M: TAS5805M I2C communication

Tony Pottier
Prodigy 20 points
Part Number: TAS5805M

Hello,

There is something I don't quite understand with the TAS5805M Audio amp. I can't connect at all through I2C and I am wondering if I am doing something wrong.

Something I have noticed is that there is no 5V on the AVDD pin.So I have 2 questions:

  • Can you use I2C without feeding any I2S signal?
  • When not sending I2S, is it normal to have no 5V on AVDD? Does the internal LDO only turn on when seeing sound?

Schematics used is basically textbook of the datasheet so I am not quite sure why I can't seem to make the device work. Any help would be appreciated.

  • 0
    Prodigy 20 points
    For what it's worth: I found the issue.

    In the datasheet it says:

    "The TAS5805M device has 7 bits for the slave address. The first five bits (MSBs) of the slave address are factory preset to 01011(0x5x). The next two bits of address byte are the select bits which can be user-defined by ADR pin in Table4."

    4.7k: 0
    15k: 1
    47k: 2
    120k: 3

    So since I picked 15k, I used 0x51 as address. Except 0101101 is 0x2D and not 0x51. This is a gross overlook but I was really lead to this by the "preset to (0x5x)". I think you might want to remove the 0x5x all together from the datasheet.

    Thanks!