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Published 20 hours ago • verified publisher icon simplefoc

INA240 version

Open PixelMutation opened this issue 3 years ago • 2 comments

The version of INA240 is not specified in the BOM. According to the datasheet there are 4 versions. To clarify, is it INA240A2, since that is what is used on the regular FOC shield?

PixelMutation avatar Mar 17 '22 14:03 PixelMutation

Also curious! Tried with A3 and they (specifically the INA240 over 3 attempts) keep frying. Could be another issue e.g. voltage but wondering if using the wrong spec.

GovP avatar Jul 17 '22 14:07 GovP

Hey guys, Sorry for the delay, I've forgotten to reply. It depends on the currents you're interested in measuring.

The board has a resistor of 1milliOhm (it can be changed as well) and since usual ADC voltage is 3.3V. INA240 gains are:

  • A1 10V/V
  • A2 50V/V
  • A3 100V/V
  • A4 200V/V

The current range will be:

max_current = 3.3V/2 / 0.001milliOhm / gain (V/V)

So A1 would give you a range of 3.3/2/0.001/10=165 Amps :D A2 will give you a range of 3.3/2/0.001/50=33 Amps With A3 range will be 3.3/2/0.001/100=16.5 Amps And for A4 3.3/2/0.001/200= 8.25 Amps

So in my case I've used the A2. But the rule of thumb would be to use the highest gain possible for your application.

askuric avatar Jan 10 '23 11:01 askuric