I2C does not work properly on NHD-C0220BIZ-FSW-FBW-3V3M

oguz

• November 04, 2018 07:04

NHD-C0220BIZ-FSW-FBW-3V3M does not have sufficient drive for the SDA line of I2C. Scope capture is attached.

With a 2.2K pullup resistor, the display can not drive SDA to ground. The voltage is more than 1V.

With a 10K pullup resistor, the voltage is 0.5V.

We will need 500 to 1000 displays next year for our automation project but we can not buy because of this problem.

 

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  ec

  • January 25, 2021 05:47

  I am seeing exact same problem, display cannot pull SDA line sufficiently low, even with very short, low capacitance connection to I2C bus. Is there any suggested fix?

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  Ted M.

  NHD Staff

  • January 28, 2021 09:16

  Hi ec,
  
  Please try using a higher value pull-up resistor, or try using a pull-down resistor instead.
  
  Regards,
  

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