DRV8323: Current sampling positive

Annie Liu

Part Number: DRV8323

Hi Team,

The following figure is the schematic diagram of the current sampling of DRV8323 in the data sheet. Pin SPA is connected to the high side of the sampling Rsense resistor. Pin SNA is connected to the low side of the sampling resistor Rsense.

The customer wants to know if it can be done: SPA is connected to the GND of the sampling resistor, and SNA is connected to the high side of the sampling resistor?

Thanks,

Annie

over 3 years ago

0 Paul Parrot over 3 years ago

TI__Intellectual 2345 points

Hey Annie,

I'm currently looking in to this, I'll get back to tomorrow.

Regards,

Paul

0 Paul Parrot over 3 years ago in reply to Paul Parrot

TI__Intellectual 2345 points

Hey Annie,

Quick follow up question: Why are they wanting to swap SPx and SNx? What's the goal they're trying to achieve?

Regards,

Paul

0 Paul Parrot over 3 years ago in reply to Paul Parrot

TI__Intellectual 2345 points

Hey Annie,

The customer can swap the SPx and SNx pins without issue. If they simply want to test I recommend putting 0 Ohm resistors in series with the SPx and SNx pins like this:

This way they can easily switch which pin is connected to the high and low side of the CSA by removing and populating the other set of resistors.

Regards,

Paul

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DRV8323: Current sampling positive