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ADS1015: ADS1015-Q1 support

Colt Zhang
Expert 4250 points
Part Number: ADS1015

our ADS101x family of ADCs has an ESD diode on the AIN port, if there is a voltage signal on the AIN port first, but the VDD is not powered, the other pins of the chip like VDD,SCL, SDA if there will be a cross-over condition,

  • 0
    TI__Guru** 113765 points

    Hi Colt,

    If there is a voltage applied to the analog inputs prior to VDD going high, then there is the potential for the Absolute Maximum Ratings to be violated.  The input voltage will drive current into the pin through the ESD diode to the VDD supply connection.  The absolute maximum for the analog input pin has two separate conditions:

    1. The input voltage should not go beyond VDD + 0.3V.
    2. The input current through the device input pin must be limited to 10mA or less.

    So applying a voltage to the input pin before VDD is powered should be avoided.  At the very least there should be enough input filter resistance to limit the current to 10mA or less.  In most cases a 1k Ohm filter resistor should be sufficient.  However, making the resistor too large (greater than 2k) could start to cause a measurement accuracy issue due to the lower input impedance of the ADS1015.

    Best regards,

    Bob B