DS90UB927Q-Q1: DS90UB927Q-Q1 IIC PULL-UP 1.8V with Vddio = 1.8V Issue - Interface forum - Interface

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Xiaoxiang Liu

Expert 7575 points

Part Number: DS90UB927Q-Q1

Hi expert,

Could you explain why the IIC must require a 3.3V pull-up?

I saw from the specification that its VIH is greater than 0.7*VDDIO.

If our VDDIO is 1.8V, can SDA&SCL directly pull up VDDIO? Could you explain why?

Thanks

Xiaoxiang

over 1 year ago

0 Nikolas Antonucci over 1 year ago

TI__Mastermind 21535 points

Hi Xiaoxiang,

Who is the tier 1 and OEM?

The 927 only requires 3.3V for the I2C bus. It does not support 1.8V for I2C.

Best,

Nikolas

0 Xiaoxiang Liu over 1 year ago in reply to Nikolas Antonucci

TI__Expert 7575 points

Hi Nikolas,

Thanks for your support.

This is a public link, and I will tell you about TIER1 and OEM separately.

We are curious why IIC can only pull up to 3.3V, as the customer has used 1.8V in mass production without any issues. It also meets the requirement of VIH > 0.7 VDDIO.

Could you internally confirm the risks of doing so?