Pynq current measurement

[ananya.muddu]

Hi,

How did you measure the typical current ranges listed in Table 1.1 in the Pynq reference manual?

https://reference.digilentinc.com/reference/programmable-logic/pynq-z1/reference-manual

I have purchased a Pynq board and would like to measure actual power consumed by different board components using an external measurement device. I was wondering whether there are shunt resistors on the Pynq (similar to the ARTY) that enable measurements listed in Table 1.1.

Best regards,

Ananya

 

[jpeyron]

Hi @ananya.muddu,

I am sorry for the delay, I have been researching how we measured the typical current ranges. I have reached out to the engineer that did this. I might take a couple of days for me to respond with more information. 

cheers,

Jon 

[jpeyron]

Hi @ananya.muddu,

The engineer got back to me about your question. Typical current consumption ranges from static consumption measured with no design loaded and the sum of typical current values from datasheets of parts powered from that rail. By no means is it an exact science. If the current sense resistors are still on the revision when the OOB demo gets created, we measure the currents with that. With the PYNQ the current sense resistors were removed from the production version, so you do not have an easy task. You could measure the inductor peak current and estimate power consumption from there.

thank you,

Jon

[ananya.muddu]

Thank you, @jpeyron for providing a good, prompt answer.