Hi
I want to know the ADC gain of current sense used for DC current sensing in DRV8313EVM design?
Is it inverting or non-inverting configuration?
What is the offset for the same?
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Hi
I want to know the ADC gain of current sense used for DC current sensing in DRV8313EVM design?
Is it inverting or non-inverting configuration?
What is the offset for the same?
Hello Prabhat,
I'll be able to do some calculations on the external CSA on the DRV8313EVM and tell you this information by the end of Monday, 8/2/21.
best,
Johnny
I apologize for the delay, I am still working on this. I should have these numbers for you tomorrow.
best,
Johnny
Hi Prabhat,
The DRV8313EVM has an external, non-inverting CSA. It can be seen here on the EVM schematic (found in the "Design Files" located on this webpage (LINK)):
The gain of this external CSA on the EVM is 33.2. The output offset for this configuration is approximately ± 3.32 mV, and the current sense offset is approximately ± 10 mA.
best,
Johnny
Hi Johnny, by offset I meant that what will be the voltage output from CSA when the current is 0.
Hi Prabhat,
My apologies, I provided you with the expected offset error of this particular op amp in my previous post (± 3.32 mV). The resistor divider on the + pin of the op-amp biases the output at 1/2 of the 3.3V input since the two resistors of the voltage divider are equal. The output offset would be 1.65V.