Use PPK2 testing nrf9160 PSM and eDRX power consumption

RE: Use PPK2 testing nrf9160 PSM and eDRX power consumption

Devin Li — Fri, 29 Jan 2021 02:15:03 GMT

Thank you for your reply, this ppk2 is a great tool!

RE: Use PPK2 testing nrf9160 PSM and eDRX power consumption

Stian Røed Hafskjold — Thu, 28 Jan 2021 10:32:02 GMT

Ok, that looks better. The reason why the ampere meter mode is showing a higher current is because of switching noise from the DK onboard regulators, so it's hard to measure the lowest idle currents in this mode. Using the PPK in source meter mode powers the nRF91 directly avoiding using the noisy regulators as source.

RE: Use PPK2 testing nrf9160 PSM and eDRX power consumption

Devin Li — Thu, 28 Jan 2021 03:04:28 GMT

Hi, according to the "source meter" mode method, the measured current should be normal.

RE: Use PPK2 testing nrf9160 PSM and eDRX power consumption

Stian Røed Hafskjold — Wed, 27 Jan 2021 15:38:53 GMT

Can you try to connect the PPK2 as shown in the picture below? Use source meter mode and set the output voltage to 5V

RE: Use PPK2 testing nrf9160 PSM and eDRX power consumption

Devin Li — Wed, 27 Jan 2021 08:31:25 GMT

Hi, I set the VDD IO switch on the DK to 3V, then the current value measured with ppk2 as follow:

RE: Use PPK2 testing nrf9160 PSM and eDRX power consumption

Stian Røed Hafskjold — Fri, 15 Jan 2021 13:08:34 GMT

Hi, In the plot you posted, the 7 uA includes the whole window, which includes the radio part as well. Can you try to select only the idle part by holding down shift (as instructed in lower right part of the plot itself)?

On earlier DK versions (including 0.8.5 as you have) we had a problem with leakage currents through the reset pin if the IO voltage voltage was set to 1.8V. Try to set the VDD IO switch on the DK to 3V (placed next to the power switch), to remove the leakage current. Are you able to reach 4 uA now? The PSM floor current varies a little bit from chip to chip, but 7 uA is too much and indicates a measurement error.