In nRF5_SDK_15.2.0_9412b96 ，Power consumption is abnormal

[zhanglt3420]

   Hello, Professional，I meet a strange phenomenon,now I use the nrf52832 IC, when I use the ble_app_hrs_freertos in SDK 11, the Power consumption is nomal, The Average current is 0.8ma when the Device is advertising。

   But the strange phenomenon is that when I use ble_app_hrs_freertos in nRF5_SDK_15.2.0_9412b96. The device is the same with the above step. The Average current is 3.0 ma when the Device is advertising..I have not modified the code at all. 

  Can anyone give me Suggestions？ I also doubt that the FPU is open,the current is higher than previous SDK.But I look for the data sheet,and it said the FPU will add one tenth of current than FPU closed.

[Edvin]

Hello,

I tried to replicate your numbers, but I wasn't able to.

I got these numbers using the unmodified ble_app_hrs_freertos from SDK15.

Can you try to unzip a new copy of the SDK, so that you are sure that you haven't accidentally modified any files outside the project folder?

Also, did you enable the FPU in some way?

And lastly, how did you measure the current on the nRF? Do you use an SDK? Did you cut Solder Bridge 9 (SB9)?

Best regards,

Edvin

[zhanglt3420]

Hi，Edvin，Thanks for your reply，I used the SDK which download from the Official website. The example is unzip from the SDK zip. Really I find the code open the FPU in the Keil Configuration。I have ever try to close it.But the code will report many errors.I cut the SB9 .the method I used is that seriesing connection the multimeter into the circuit.And the multimeter is in the current range.and the show number is the current.can you give me an example you used for test and the current is normal?

[Edvin]

Can you try to program the attached .hex-file, and measure the current on it? Remember to erase the chip first. The hex file is an application merged with the softdevice. I just want to see what kind of current it draws on your DK.

test_me.hex

You can use "nrfjprog --program test_me.hex --verify && nrfjprog --reset" if you have Nordic Command Line Tools installed, or use nRFgo Studio to program the hex file.

Best regards,

Edvin

[zhanglt3420]

I am very sorry to reply you so late,Edvin.I'm busy with other things in recently days.I will try the hex you gived.Thank you.And will tell you the result