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Original question:

TCA9509: Regarding need of Test conditions to validate this level translator.

TCA9509: Regarding current consumption test condition.

Bhuvaneshwari K
Intellectual 370 points
Part Number: TCA9509


Hi,

How to perform this ICC quiescent current test on this level translator.

since, I m not getting the test condition mentioned in the datasheet.

  • 0
    TI__Guru 53958 points

    Hi Bhuvaneshwari,

    The voltage supplies rails must be within these values unless specified otherwise. This should be your starting point. 

    A static HIGH or static low condition is when the bus is pulled HIGH in an idle condition by external pull-ups or pulled LOW to where a LOW is consistent on both A-side and B-side. 

    ICC is the current measured through either the VCCA or VCCB supply. 

    This is not the current when a I2C signal is being passed through the device. 

    What does your test setup look like? 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    Intellectual 370 points

    Hi Tyler,

    this is the test circuit.

    How can I perform Current consumption and ,multi voltage level translation , dynamic characteristics as well.

  • 0 in reply to Bhuvaneshwari K
    TI__Guru 53958 points

    Bhuvaneshwari,

    For ICC through VCCA and VCCB, you must follow the datasheet requirements for the input voltages. 

    ICCA(high),  measure current through when no activity is present on A-side VCCA. 

    ICCA(low), tie all A-ports LOW, measure current through VCCA. 

    ICCB(high), tie all B-ports through pull-up resistors to VCCB, measure current through VCCB. 

    For all of these test cases for ICC, I believe since the current is quiescent, EN = 0V, meaning the internal buffer redrivers are all disabled. 

    Your test setup for multi voltage level translation is setup. Simply test voltage translation by setting different voltage levels for VCCA and VCCB according to the datasheet. 

    For dynamic characteristics, these measurements should be made on a high-sampling high bandwidth oscilloscope for capturing purposes. Follow the timing test specifications as listed in figure 8-1. Propagation delays, transitions times are all measured based off 30%, 50%, and 70%, levels of VCCA and VCCB. 

    For example, tPLH is the prop delay from port A to port B, and from port B to port A. Measure from 50% of input voltage on port A to 50% of output voltage on port B. 

    For rise and fall time, these values are based off of 30% and 70% of the supply voltages in use. 

    Regards,

    Tyler