wmthesecond
Posts: 1
Joined: Fri Oct 05, 2018 3:03 pm

Measuring Current Draw on Specific Pins

Fri Oct 05, 2018 3:11 pm

I am looking to measure the current draw of specific pins (VDAC, 3V3, 1V8, VBAT) on the Raspberry Pi Compute Module 3, but am not sure how to go about doing it. I have considered soldering leads to the pins but am not sure this is feasible given their size. Any advice?

aBUGSworstnightmare
Posts: 1498
Joined: Tue Jun 30, 2015 1:35 pm

Re: Measuring Current Draw on Specific Pins

Fri Oct 05, 2018 6:16 pm

The CMIO has four Zero (0) Ohm resistor: R1,R4,R5,R6
You can unsolder them and measure current from there.

Refer to page 2 of the CMIO schematic https://www.raspberrypi.org/documentati ... IO_3p0.pdf

smaddox
Posts: 8
Joined: Wed Oct 30, 2019 2:58 pm

Re: Measuring Current Draw on Specific Pins

Sat Nov 09, 2019 3:11 pm

Hi wmthesecond,

Did you measure draw for these or did you find the information elsewhere? Am working on a CM3 based PCB and have the RPi stated draw, which I presume is the "absolute maximum", and would like to understand what minimum and typical are.

thx - sean

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