MCF8329A: question about current sensing

?? ?

Part Number: MCF8329A

Tool/software:

Hello. Could you explain how the MCF8329A handles situations where the reference voltage for current sensing is not exactly 1.5V but has a slight bias?

10 months ago

+1 Manu Balakrishnan 10 months ago

TI__Intellectual 1850 points

Hi, The reference voltage for current sense is fixed to 1.5V in MCF8329A. Can you help us to understand the difference on this bias?

Regards,

Manu

0 ?? ? 10 months ago in reply to Manu Balakrishnan

Prodigy 70 points

Due to the current structure of our circuit, the ground of the shunt resistor may fluctuate from noise generated when the motor is running. This could cause issues in current sensing. Does the driver have any protection features against this noise, or is there an algorithmic solution implemented for this?

+1 Sachin S 10 months ago in reply to ?? ?

TI__Expert 6011 points

Hi,

I am told by the team that there is a dynamic offset correction internal to the device which can help you if the device has a DC bias on the shunt, but we cannot compensate for any AC coupling on the shunt voltage.

Thanks and regards,

Sachin S

+1 ?? ? 10 months ago in reply to Sachin S

Prodigy 70 points

Thank you both very much for your responses.

0 ?? ? 10 months ago in reply to Sachin S

Prodigy 70 points

Do you have any materials related to this? I couldn't find it in the datasheet.

+1 Sachin S 10 months ago in reply to ?? ?

TI__Expert 6011 points

Hi,

Currently it is not mentioned in the datasheet or any documents. We will plan to include it in one of the document releases and datasheet updates going forward.

Thanks and regards,

Sachin S

Motor drivers

Motor drivers forum

MCF8329A: question about current sensing