Mesh LPN example current consumption

Question

Hi, 
 after setting up the LPN-example like described here I can establish a frindship relation. 
 When I measure the current I can not get lower than 40uA. 
 
 I use a Multimeter in DC-range, 3 nRF52840 dev. Boards, and Mesh SDK 3.1.0 
 What am I doing wrong? 
 
 Regards 
 Gerry

Mttrinh · Accepted Answer

There are no other mesh examples that can get the nRF52840 into this state. Using Bluetooth Mesh causes higher power consumption than traditional Bluetooth low energy applications. This is mainly due to the need for keeping the radio running constantly. We are still working to improve the power consumption for LPN. I don't think you can get the current consumption as low as 4uA.

Heiner · Answer

Hi Gerry, 
 I actually posted a similar question in this thread . 
 
 First of all, as Mttrinh mentioned you have to disable RTT and also stop the proxy functionality. 
 It's described in more detail in the link. 
 
 Second, how are you measuring the current? 
 If you are measuring the current drawn by the Development Kit you might want to take into account, that the MCU which is used for debugging is still consuming 20 uA, even when powered over the external supply. So the 34 uA you are measuring are actually just 14 uA consumed by the nRF52840 and 20 uA consumed by the other MCU. Which you can just remove in your design later. 
 This is done to maintain the reset button functionality even though I personally think I would rather have the MCU powered off completely. 
 
 Hope this helps. 
 
 Best, 
 Heiner

Mesh LPN example current consumption

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