power consumption ebyte e73-tbb (nrf52832)

[nefen]

I'm developing on e73-tbb and I tested power consumption with Power Profiler Kit II and I found enormous currents.

I use nrfConnect SDK v2.3.0.

I then tried zephyr system_off example. Still, current consumption does not drop below 1.90mA.

Kit specifications states a standby current at 400nA. 

I face a lot of issues programming for Power Management. Most of examples, smaple code and forum threads are for nrf  SDK and not for nrf Connect.

I have two questions:

1. Does anyone have any idea what might happen and how might I reduce power consumption

2. I have seen that a new framework has been presented for power mangement. CAF Power Management. Is there any code sample available for nrfConnect/nrf52832 available?

[Kenneth]

Hello,

I then tried zephyr system_off example. Still, current consumption does not drop below 1.90mA.

I am not familiar with the module in question. But make sure that you measure on VDD that is fed to the nRF52832 directly (no other circuitry), and also make sure there are no LED drawing current. I also recommend to get an nRF52-DK for test, these cost about $39 on digikey: 
https://infocenter.nordicsemi.com/topic/ug_nrf52832_dk/UG/dk/hw_measure_current.html 

Kenneth

[nefen]

First, thank you for your prompt reply!

1. I have 2 nRF52-DK. I just wanted to test a new circuit and I didn't want to burn them. I am not that good with electronics. I actually burned one!

2. It is funny. I contacted ebyte and they helped me solve the problem! They admitted that consumption is due to the extra UART, power led and power supply (to transform 5VDC from USB to 3.3). I asked them if I might find a way to go around and test the boards I already have and they told me to remove power led, ch340 chip，ldo chip!!! I like the practical way of their thinking!

I did it and now consumption is at 4uA.

3. Can you do something regarding point 2 of my question? Code examples are rare for nrfConnect.