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tas5717 schematic questions

alex camilo
Intellectual 270 points
Other Parts Discussed in Thread: TAS5717, TAS5717EVM

i'm having some trouble bringing up a tas5717. I currently have the circut below wired up to a pure path audio EB.

3.3v (vdd) is supplied from the EB and the 5v is supplied by a benchtop supply.

The chip is not responding to i2c writes.

Here is my schematic, am i doing anything stupid?

  • 0
    TI__Mastermind 22965 points

    Hi Alex,

    What I2C slave-address are you using? Do you see I2C transaction with a nack on the scope?

    Are there any there I2C slaves on the bus, if so, are you able to interface with them? If you have a TAS5717EVM, a good debug check would also be to try and interface the EVM with this I2C bus.

    -Ravi

  • 0 in reply to Ravi Singh
    Intellectual 270 points

    Hi Alex,

    What I2C slave-address are you using? Do you see I2C transaction with a nack on the scope?

    I've viewed the signal on the scope. Starting from the start condition the bytes are 010101101

     The address in the datasheet is listed as either 0x54 or 0x56. i'm using 0x56. (tied select pin to vdd)

    I've decoded that as (0x2b write nak). I think they're including the write as part of the address because 0x2b<<1 is 0x56.

    Are there any there I2C slaves on the bus, if so, are you able to interface with them? If you have a TAS5717EVM, a good debug check would also be to try and interface the EVM with this I2C bus.

    No other i2c devices on the bus, i have the tas5717EVM. i'll try talking to that.

    -Ravi