Hi Team,
I have a question about TCA9517 power supply requirement VCCA < VCCB which listed in the datasheet.
[Question]
Please advise us if user could use TCA9517 in the condition of VCCA > VCCB.
I've found some information in the following post.
https://e2e.ti.com/support/interface/i2c/f/390/p/266001/933222#933222
> The TCA9517 is powered off of the VCCB rail and the VCCA rail is just used as a reference level for the A inputs.
> This is why we always recommend that VCCB (main supply voltage) is higher than the VCCA side.
From this post, I understood that VCCA is only used as a reference level and VCCB is the power for the IC. In this case, I think VCCA < VCCB is not a must power requirement. I believe the device could be used as long as VCCB is higher than 2.7V.
Datasheet "Recommended Operating Conditions" does not show VCCB to be higher than VCCA.
Best Regards,
Kawai