NRF52832 ble_upp_multirole_lesc example DCDC WORKING ONLY IN DEBUGGING

[FatihAlparslan]

Hi, I'm working on NRF52832 ble_upp_multirole_lesc example in SDK15.0.0. When I try to activate its DCDC attribute via NRF_POWER->DCDCEN = POWER_DCDCEN_DCDCEN_Enabled or sd_power_dcdc_mode_set()(after ble_stack_init) commands, the program stops working. However, the program works during debugging. My clock source is RC32 kHz,   .rc_ctiv = 16,  .rc_temp_ctiv = 2,  .accuracy  = 1. I couldn't find a solution to this roblem. Could you help me out? Thanks in advance. Best regards.

[Einar Thorsrud]

Hi,

Are you using a DK or custom HW? If you are using custom HW, do you have the two optional inductors that are needed for the DC/DC mounted on the board?

[FatihAlparslan]

Hello thanks for your reply. I did not use a DK, I use custom (my own) HW board. I use Skylab SKB369 module. I regulate voltage from 4.2 yo 3.3 via a voltage regulator. I did not use any inductor. Could you share your recomended HW  design? Best Regards

[Einar Thorsrud]

Hi,

FatihAlparslan said:

I did not use any inductor.

Then this is expected. You cannot enable the DCDC converter if your HW does not have the optional inductors.

FatihAlparslan said:

Could you share your recomended HW  design?

Please refer to the Reference circuitry. There you can see that there are differences between LDO setup and DC/DC, where the DC/DC setup has two additional inductors that are needed by the DC/DC.