Need help regarding current consumption in LPN

[Rohan George]

Hi,

Mesh SDK: v5

Using nRF 528232

I had implemented the Low Power Node example from the SDK and found that the current it consumed using a 1000mAh 3.7V battery was around 450uA in low power mode and when polling it is around 560uA. Is this normal behaviour? Should I disable anything explicitly to bring the current down to at least 50uA?

The LPN was in friendship with a Light_switch_server from the Mesh SDK.

I also wanted to add that I tested and example light_switch_server onto the same board and put sd_power_system_off() in the for loop in main() and I am still getting 430uA usage. 

The current board has a PIR and LDR, which after removal gives 25uA in SYSTEM OFF. Shouldn't the value be less than 5uA?

Any help would be great

Thanks,

Rohan

[Mttrinh]

Hi,

The current consumption seems a bit high. You should get a lower consumption after you establish a friendship with a friend node, the node will then be running in low power node.

Are you using a custom application or our LPN example unmodified?

Are you using a DK or a custom board?

[Rohan George]

Hi, thanks for the reply 

I am using a custom board with an LDR and a PIR sensor. The LPN code was unmodified, but I was still getting the current higher than usual. The current after the LDR and PIR was removed was around 28uA. I will test the LPN with the devkit and will let you know the current. 

[Rohan George]

I checked with the devkit and I am getting 3.5uA, it seems that there are other components in our PCB which consumes power( like Buck Converter), I will test the current with the module only

Thank you