EVAL-AD7294 I2C programming

Hello,

On the EVAL-AD7294 we have a CY7C68013-CSP.

Can I bypass this component and communicate directly with the AD7294 using I2C.

I like to connect another MCU with this board using the I2C function.

I need to be sure that I do not damage other components on the board by doing this.

Regards,

JrV

  • 0
    •  Analog Employees 
    on Oct 11, 2011 1:57 PM

    Hello JrV,

    Thanks for your email about the EVAL-AD7294.

    If I understand correctly, you would no longer use the USB interface, rather connect your controller direct to the SDA/SCL paths? In this case, theCypress chip on the evaluation board would be unpowered as it derives it's supply from the USB power (3.3V derived from the on board regulator). It's generally not a good idea to apply voltage to unpowered signal pins on any device - most semiconductor products will have specifications detailing what voltage they can tolerate on their inputs in the absense of power, typically this is shown in the absolute max ratings sections of datasheets. I imagine this would be similar for the Cypress chip.

    As this is an evaluation board, you might consider cutting the tracks to the SDA/SCL lines and drive from your controller directly?

    Please let me know if you have further questions.

    Best regards,

    Catherine.

  • Correct.

    But the board will be connected to the USB so that everything has the needed power.

    I will not use the software, i.e. I do not write/read to the AD7294 by USB.

    I will do write/read using another board wich contains a PIC.

    Regards

  • 0
    •  Analog Employees 
    on Oct 18, 2011 1:13 PM

    Hello Joeri,

    thanks for response.

    If you provide the power from the USB and control the read/writes from your PIC, that should work just fine.

    Please let me know if you have further questions.

    Best regards,

    Catherine.

  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:26 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin