Negative current consumption Thingy:53

[gorka]

Hello,

I'm measuring the power consumption on the Thingy:53 using the Debug and Current measurement board. Initially I was measuring the current of the battery VBAT given by the P1 of the board and everything as expected. Then I proceed to measure the consumption of the nRF5340 SoC using the P2 of the board (the one that gives the VDD) and I noticed that it shows that the chip somehow "gives" energy. Show image bellow.

The thing is that I'm working on a Zigbee project, and to try to find out what's happening I measure the same current but using the simple blinky sample, and the negative consumption disappears. So, I try with other samples:

• Zigbee: Light switch  -> negative consumption appears
• Bluetooth: Peripheral LBS -> negative consumption appears

So I suppose the "problem" is related somehow with the RF. I'm a beginner with current measurement and can be a very simple thing that I don't understand, if someone can clarify me please.

Thanks,

[Kazi Afroza Sultana]

Hello,

I have few questions to find the issue.

a. ''I am measuring the power consumption on the Thingy:53 using the Debug and Current measurement board.'' Could you please share the set-up picture? How have you measured the current?

b. Negative current shows something wrong with the connection. 

c. Could you please try to measure current by PPK2?

[gorka]

Hello,

a. I have measured with a Keithley DMM7510 as following:

b. Is strange because as I mentioned if I use a simple blinky program current looks normal without negative consumption, it looks like only happens when using radio or FEM.

c. I don't have the PPK2.

Thanks you so much!

[gorka]

Hello,

Any update on this?