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TCA9617B: SCHEMATIC FOR I2C TRANSLATION FROM 5V TO 3.3V

mhc00017
Prodigy 20 points
Part Number: TCA9617B
Other Parts Discussed in Thread: ADS1115

Hello, I am interested into use this iC to translate my Analogic to digital converter which works at 5V to 3.3V for using it with my Raspberry pi3B but i cant find any schematic model with the values for this case. Can anybody please help me?

Lots of thanks:)

  • 0
    TI__Mastermind 20645 points
    Hello mhc00017,
    Is this a ADC an I2C controlled device? and is the Raspberry pin have an I2C port? This is an open drain communication protocol so you can't just use any level shifter or translator. The TCA9617B is designed for I2C and it support fast mode plus (1MHz). Are you operating at the frequency?
    -Francis Houde
  • 0 in reply to fhoude
    Prodigy 20 points

    Hello Francis,

    Lots of thanks for your answer. My Raspberry has an 3.3V i2C port, because of that i need to translate (level shift) from 5V that gives my AD converter to the Pi Level. Here i attach a schematic with the connections i think will be necessary but im not sure. If them are correctly i would like to know the values of resistance i have to use for the right working of the TCA9617B. The converter is the ADS1115 and i will use the normal operating frequency (i think is 400kHz)

  • 0 in reply to mhc00017
    TI__Mastermind 20645 points

    This looks good.  You need to select your pull resistor based on speed and bus capacitance.  We have an app not that cover that selection process.

    Let me know if you have questions.

    Francis Houde