Other Parts Discussed in Thread: PCA9306, TCA9517A, TCA9517
Can 5v first power on and later 3.3v power on? Is it feasible?
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hi Bobby,
How is this ongoing?
I found a similar question about PCA9306. Please see below link. Is that the same performance for PCA9515B?
https://e2e.ti.com/support/interface/f/138/t/827459?tisearch=e2e-sitesearch&keymatch=PCA9306
Hey Anders,
Sorry for the delay. I did testing and saw no biassing when I provided power to only the side1 SDA/SCL. This means you shouldn't have problems with the power sequence you currently have.
I found a similar question about PCA9306. Please see below link. Is that the same performance for PCA9515B?
PCA9306 is a different kind of device in the sense that it is only a level translator. The PCA9515B is a buffer AND level translator. If you expect a lot of bus capacitance between the left side of the device and the right side of the device (side 0 and 1 of your current design) then PCA9306 will not work for you.
If you are looking for a replacement device, I would recommend TCA9517/TCA9517A since it only has a static offset on B side rather than both sides like the 9515B. It provides level shifting as well and is the same package as 9515B (pin 1 of VccA on 9517 instead of no connect). I believe it should be more cost competitive than the 9515B as well since the 9517 uses new process technology.
Thanks,
-Bobby