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INA260: Multiple IC I2C addressing problem

Umut Yasar ANKARALI
Prodigy 10 points

Part Number: INA260

Hi 
We are using in our current design 12x INA260 ICs. While we are installing one by one there is no problem until we install the 10th sensor
and for example, if I ınstall 0x40 to 0x49 even I remove 0x42 I can communicate with 0x42 but I can not communicate with 0x49 that should work (it looks like both getting 0x42 address)When I remove enough ICs I can communicate with 0x49. I checked the addressing table, schematic, contacts, and voltages of pins multiple times. 
did anyone try without buffer using 16 INA260 in one line?
Additionally, I found out we have 2 different series of INA. I couldn't confirm the supplier yet. I am suspecting if one of these is fake 
Vcc: 3.3 V
I2C bus voltage: 3.3 V

I2C speed: tried 1k 10k 100k 400k with fast and standard settings 
I2C Rise time: you can check the attached image. 
I2C Pull up Res 1.5 kOhm

 Rise UP

  • 0
    TI__Mastermind 35580 points

    Hi,

    Only the top line of the package symbol stays the same. The next two lines are date code and lot trace code respectively and will change from lot to lot. Based on the symbols, these two parts were produced in July 2020 and October 2018 respectively. This information alone is not sufficient to tell if either or both are counterfeits.

    I would recommend check out all 12 addresses individually to make sure they all work flawlessly. This will give us some confidence that it is indeed a timing issue and buffers may be necessary once all 12 devices are installed. Because the yellow line shows a ~400nS rise time, this could be the root cause. Typically the rise/fall time should be 300nS or less in fast mode.

    Regards, Guang

  • 0 in reply to Guang Zhou
    Prodigy 10 points

    Hi,
    I found out the problem. the chip on the left of my second photo is counterfeit. I found some old cards with INA260 and replace them to my card. 
    Proving about the Rising time is not the problem was easy I tested even in 1khz standard mode and didn't work.
    Result is 
    I260AI-07KG4-CPGD  --> Looks like work when it's alone. when we use multiple it's beginning problems. (I didn't check the precision and measurements) we couldn't approve the supplier.
    I260AI-8AKG4-AV03 --> Works fine and no problem. 
    PS: In my case 07KG4 was fake but that I understand for someone else that numbers can change.