Additional Analog Input for Grid-Side Measurement on CRD25DA12N-FMC

SMSHR

Hello,

I am working on a grid-tied application, and planning to buy the Wolfspeed 25 kW FM3 Three-Phase Inverter (CRD25DA12N-FMC) with the TI control card.

For control purposes, I need to measure both:

• Inverter-side voltage and current (already available)
• Grid-side voltage and current (additional 6 measurements)

From the datasheet, I see that:

• Hall-effect sensors provide inverter-side current measurement.
• Phase measurement pins can be used for inverter or grid-side voltage.
• The board has a Spare Connector Pinout (J8) with some extra ADC and GPIOs.

However, I need 6 more analog measurements, but I am unsure whether the Spare Connector Pinout (J8) can be used to feed these measurements directly to the TI control card.

Could you please confirm if these spare pins are suitable for additional ADC inputs? If not, do you recommend adding an external ADC module or using a multiplexer?

Thanks for your support!

Forum_Moderator

Thank you for your post, it has been approved and we will respond as soon as possible.

ChrisN

Hello SMSHR,

Thank you for your interest in this product. On the "Spare Connector", two of the pins can be used for ADC measurements. Those pins are connected directly to the TI controlCard. The other pins can be used for spare GPIOs. We have not needed additional ADCs in our testing, so we do not have a recommended approach for adding more ADCs. We will consider this in future revisions.

Thanks,

Chris N.