We have used the INA213 in a circuit which measures current.
Voltage of the current is 5V-9VDC, Powersupply voltage of the INA is 5VDC and Vref = 0.2VDC
Measure range = 0.0mV - 10.0mV (over resistor)
Everything is within specifications of the datasheet.
Output (7VDC) is protected with a 12VDC transorb.
Everything works well but on a lot of units there is a failure after (field) testing.
It seems there is higher than expected current flowing into the IN- pin (connected to the output)
Current flowing into the IN- pin varies from 0uA to 70uA and even 500+uA.
On some of the "broken" units then applying power on the output (so the IN- pin has a higher voltage than the IN+ pin) all the units regenerate a little and
the current into the IN- is afways reduced afterwards.
All of the "broken" units still function for the other part (diff voltage across IN pins is multiplied x 50 and the Vref is added)
Any ideas on why this can happen? (then i measure between the IN- pin and GND there is indeed a low resistive path)
If this is ESD is this IC so much more sensitive to it than other? We never had any ESD problems whith other analog and digital IC's and porducts alway pas the tests.
At the moment we are unable to regenerate the failure so it is impossible to know the exact reason.
I have seen the 2x10ohm + transorb in the datasheet and we can put it on our board but first i woul like to know why the current used version is failing so we can test the datasheet version is indeed working .
