• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 29 subscribers
  • Views 549 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS2505EVM: Unable to use I2C communication from

Sigurd Baardsen
Prodigy 30 points
Part Number: TAS2505EVM
Other Parts Discussed in Thread: TAS2505

I am trying to communicate to the TAS2505 on the TAS2505EVM using I2C from a MCU devlopment board (nRF52840-DK). The issue is that I am not getting a response (NAK).

Do I have to do something to disable the controller/MCU on the TAS2505EVM (so the I2C lines are "free" to communicate with the external MCU)? Note that I have set up the various jumpers on the TAS2505EVM to select I2C comunnication.

Also, I have tried powering the TAS2505EVM both with USB from a PC (which makes the D1 and D2 LEDs light up and allows me to use the PC program to read/write various settings) and from a power adapter. Which way should it be powered to allow external I2C communication? 

Note that I have only connected SCL, SDA and GND from the external MCU development board (running at 3.3V). I2C frequency is 400k, address is 0x30.

  • 0
    TI__Guru** 110395 points
    Hi Sigurd,

    Welcome to e2e.
    Unfortunately this EVM was not designed to communicate with an external controller.
    If you only need external I2C communication, you could remove U5 from the board and use W2 and W3 to connect SCL/SDA. By doing this the pull-up resistors will still be present. If you need U5 (level translator) you can keep in on the board and cut the traces that come from U1.
    If you need to connect an external I2C and I2S source, I would recommend to remove U1 and U2 from the board.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 30 points
    Thanks, I was starting to suspect as much.