LTC2945 and LTC2946 Differences

For reference on the differences in operating between the two products, see these links: link 1 link 2. Try to also use the evaluation software UI to confirm the desired behavior.

Thanks for the reply! I have read over the datasheets several times. I don't have the eval board for the 2946 and I am unsure that comparing the two eval boards with the quickeval software will help my specific problem.

Specific problem: Stuck I2C bus. I believe that something about the device is coming up from power up differently than the 2945 would because I have a stuck bus on three different I2C busses, each with 7 of these devices on them. Previous iteration of this board using the 2945 and the same software I'm using now worked wonderfully so it has to be a difference between the 2945 and 2946 that I missed. 

Circuit: All unused IO is grounded or floating as dictated by pin description so the two should be functionally the same in circuit which has not changed. The circuit is a clone of "A Wide Range Supply Monitor" from the 2945 datasheet, very simple.

Software: I initialize all of the devices using the control register set to 0x05 for the 2945 and now CTRLA to 0x18 and CTRLB to 0x15 for the 2946. These settings should match functionality. I don't know that this has any effect since I see a stuck high bus from power up so no I2C transactions are getting through. 

Hi. Could you share your schematic diagram for better understanding of the problem? Kindly also provide the I2C signal transaction. 

Hi. Could you share your schematic diagram for better understanding of the problem? Kindly also provide the I2C signal transaction.