INA231: INA231 short shunt pins impact

Claire

Part Number: INA231

Tool/software:

Hi, I'm using INA231 on my board and I change shunt resistor from 0.510mOhms to 0 Ohms.
After that, and few test, INA seems damaged: One board with a INA doesn't anwser (no I2C response) anymore and one more give me wrong value of Vbus.
My setup is design for supply between 1.8 and 3V and for 100mA max current to measure
I don't understand why INA can't support 0 Ohms shunt value as he is specify for -30/+30V on shunt pin and Vshunt can be -82mV to 82mV.
Do you have any idea of what is going wrong?

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 322020 points

A 0 Ω shunt resistor is no problem.

It appears that your devices got damaged, but I do not have enough information to determine the cause. Was the voltage at the input/bus pins always inside the allowed range? Is there noise that could cause voltage spikes? Did you ever handle the chips or boards without ESD protection?

0 Mitch M over 1 year ago

TI__Mastermind 29405 points

Hey Claire,

Clemens is correct, that wouldn't have been the cause of the issue. In addition to Clemens's questions, could you also share a snip of the relevant schematic section so that we can better analyze?

Regards,

Mitch

0 Claire over 1 year ago in reply to Mitch M

Prodigy 10 points

Max voltage on Vbus is 2V8. Below the schematics CaptureINA.JPG

0 Mitch M over 1 year ago in reply to Claire

TI__Mastermind 29405 points

Hey Claire,

Due to security reasons, I am unable to follow the link to download the JPG, could you paste the image directly in your post?

0 Mitch M over 1 year ago in reply to Mitch M

TI__Mastermind 29405 points

Hey Claire,

It's been a while since we heard from you, I'll go ahead and mark this thread as resolved. Let us know if you need any further assistance.

Regards,

Mitch

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INA231: INA231 short shunt pins impact