TPS65094: I2C VOL spec

Tiger Yeh

Expert 4285 points

Part Number: TPS65094

Hi~

TPS650941 I2C the maximum VOL threshold is 0.4V and Apollo Lake I2C maximum VOL threshold is 0.45V.

Could you please check whether TPS65094x spec could meet or same as APL's spec?

over 6 years ago

0 Nastasha over 6 years ago

TI__Genius 10000 points

Hi,

We cannot guarantee the behavior of devices outside of the spec. It is recommended for the TPS65094 that the VOL I2C signal have a max voltage of 0.4V. Please let me know if you have any further questions.

Thanks,
Nastasha

0 Tiger Yeh over 6 years ago in reply to Nastasha

TI__Expert 4285 points

Thanks for quick reply Nastasha.
If this is not guaranteed, does it mean TPS65094x will not guarantee to work with Intel Apollo lake SoC in worst condition?
Please help to double confirm.

0 Nastasha over 6 years ago in reply to Tiger Yeh

TI__Genius 10000 points

Tiger,

I will look into this and get back to you early next week.

Thanks,
Nastasha

0 Kevin LaRosa over 6 years ago in reply to Nastasha

TI__Genius 17380 points

Hi Tiger,

I2C specification (www.nxp.com/documents/user_manual/UM10204.pdf - Table 9) shows VOL maximum = 0.4 V, so customer may want to contact Intel to determine if Intel is really outside of I2C specification. In the meantime, we will check our theoretical VIL since specification allows for us to go as high as 0.54 V for 1.8V input.

0 Kevin LaRosa over 6 years ago in reply to Kevin LaRosa

TI__Genius 17380 points

Hi Tiger,

Our theoretical VIL setting is 0.45 V.

More importantly, the Intel specification of 0.45 V is at 3 mA, which at 1.8V supply is a 600 ohm pull-up. The CRB uses 1 kohm pull-up. As such, we would expect VOL with 1.8 mA to be proportionally lower and well within our guaranteed range for VIL. Given the extensive validation done by Intel, we don't expect this to be an issue.

0 Tiger Yeh over 6 years ago in reply to Kevin LaRosa

TI__Expert 4285 points

Thank you so much, Kevin.

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TPS65094: I2C VOL spec