About SAADC Power

[AnsonTse]

Hi~

I have a question about the SAADC.BLE Connect Mode. When I turned on Saadc LP mode, the power dissipation was 0.02mA for single-channel sampling, but 0.5mA for dual-channel sampling. How can I reduce the power dissipation during dual channel sampling?

Thx!

[Carl Richard]

Hello!

I suspect that this could be due to a bug in the driver. While I investigate that, could you see if the workaround in this thread works for you?

For convenience: which SDK are you using? The drivers are regularly updated, so it could be a fix in a later version.

Best regards,
Carl Richard

[AnsonTse]

Hi Carl，Thanks for reply！

I using SDK12.1.0,And I tried SDK 15.3 and the problem still exists.

I've looked at the solution, but the content of the solution is 1 Channel,unfortunately,It not helpful to our problem.

[Carl Richard]

Hi again!

It should be possible to do a similar configuration for more channels. See this thread, where Jørgen has attached the following project: 3343.saadc_low_power_multichannel_sdk15_3_0.zip
This shows how multichannel low power sampling can be enabled. The example is not BLE enabled, but it should be a simple transition.

In the thread above Jørgen also the describes the increased power consumption during multi-channel sampling. It is due to EasyDMA being enabled, and staying enabled after the SAADC is started. 

Best regards,
Carl Richard