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ADS7142: IC functionality when only DVDD is applies

RvN
Prodigy 10 points

Part Number: ADS7142

Hey,

Since our device is a portable device, a lot of PSUs can be disabled. In the current situation, it can be that the AVDD power rail will be disabled, but the DVDD power rail is still present. I have a few questions for this situation:

  1. Is this allowed (AVDD=0V, DVDD=1V8)?
  2. Can I use the connected I2C bus as usual in this state?
    1. Does this IC still respond over I2C when only DVDD is applied?
    2. If not, can I just use the I2C bus for other peripheral ICs?
  3. In which power 'state' is the IC when AVDD=0V, DVDD=1V8? In other words, what is the curren/power consumption of the IC?

Thanks.

 

  • +1
    TI__Mastermind 20640 points

    Hello,

    AVDD powers all functional blocks within the device, with DVDD setting the IO voltage of the device. 

    DVDD can operate independently from AVDD, so it can be 1.8V while AVDD is 0V. However, the I2C interface will not be responsive, so yes, other peripherals on the I2C bus can still communicate during this.

    Current consumption is negligible while DVDD is up and AVDD is 0V, as no internal blocks are receiving power, and the I2C line is not actively driven by the device. 

    Regards,
    Joel