How to use P21 external supply in nRF52833 DK

[Ziyao Zhou]

Hi,

I am using nRF52833 DK and power it using P21 External supply. I connected P21 with the power profiler 2 and give 1.8V.  It works for serveral days, however, today I notice when I give 1.8V the program will not run. If I change to around 2.2V, it start running.

I have three questions:

1. What happen to the DK, before it can work under 1.8V, now it cannot.

2. When I am measure the current through P21, with all default setting(VDD power source, vEXT-nRF off, default), am I measuring the total current consume by the nrf52833 and interface MCU?

3.Can P21 use together with Lipo battery, if I connect a battery here, is there any battery management circuit after P21.

I have found some schemetic but I have no clue about what is happening in this DK. Thank you so much for your time!

[Simonr]

Hi

Can you share some details on what SW9 is set to with these measurements. I'm not so sure the boards is damaged (unless you've powered it above the specified values. But I see here that you're powering it with 1.8V, which will only be supported if you power the board with SW9 in the VDD position. The Li-Po and USB settings only support 2.5V-5.5V supply voltages. That being said. Please also make sure you have the micro USB connected to the debugger MCU so that it is powered as well. If not you'll also see a lot of noise.

Best regards,

Simon

[Ziyao Zhou]

I just try to use a brand new nRF52833 DK, I notice when I switch SW10 to the ON position and SW9 to the middle position (VDD) the program (system off and will be trigger wakeup through buttons) will not work correctly, only when SW10 to the off it works well. Why this happen to a brandnew DK?

1. SW10 off works well.

1. SW10 on high power consumption.

I am very sure when I switch on the power gose higher, this is on the opposite of 

Simonr said:

1. To power the nRF52833 from P21, you should slide the switch SW10 to the ON position and SW9 to the middle position (VDD).