TMP75-Q1: TMP75-Q1: PEC operation/support question, Re-open

Hi Jash (@Jash.Wyatt),

Our question is - why TMP75 latch SDA signal in low when I2C host communicate Max20480 with PEC enabled command.

Shih -

The two protocols are incompatible with each other in this regard. As gently encouraged already, it would be logical not to use the optional PEC with this combination of parts. 

Hi Josh,

If we add TCA9548A to isolate them(see concept picture below), is it workable?

Dear Shih - 

Yes, of course, placing the devices on different communication busses will accomplish same, as it will not use the PEC with the TMP75 devices (you could keep them on one channel) and will be able to send PEC to the Maxim part on exclusive channel, in this case. 

Since you only need two channels, though, and you are trying to make something happen, soon though - you could also consider the two channel versions in that part family. Both are in stock as of tonight.

Here is a comparison: 

https://www.ti.com/assets/js/compareParts/compare.html?familyId=1650&parts=TCA9543A,PCA9543A&cols=o1,p3318,p3107,p0max,p0min,p2954,p2192,p1498,p1130,p210max,p480&lang=en 

Hi Josh,

Thanks. I will let our team to check the protocol between max20480 and TMP75 and update later.