nrf52 pcb external power supply

RE: nrf52 pcb external power supply

JONATHAN LL — Tue, 09 Mar 2021 15:36:21 GMT

[quote user="ENENER"]So if I want to connect external powwer supply, Only I have to do is apply voltage A7 or H7??[/quote]

Yes,

check the documentation here: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=4_2_0_17#concept

In the LOD setup

Here is the operating recommendations: 1.7V - 3.6V.

I also recommend to read the PCB guidelines.

Regards,
Jonathan

RE: nrf52 pcb external power supply

ENENER — Tue, 09 Mar 2021 13:55:03 GMT

Thanks.

It was very helpful for me.

But I want to ask one more thing.

You said "the external power is connected to both A7 and H7".

So if I want to connect external powwer supply, Only I have to do is apply voltage A7 or H7??

Thanky for replying.

RE: nrf52 pcb external power supply

JONATHAN LL — Tue, 09 Mar 2021 11:28:04 GMT

Hi,

Here is the layout form the reference design, as you can see the external power is connected to both A7 and H7

And the ADC's full scale input range (0 to VDD). You can read more about the ADC reference here: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/saadc.html?cp=4_2_0_36_7#concept_kxz_4pp_qr

[quote user=""]I want to know if I apply External Power Supply about 1.8V, can ADC measure over 1.8V - 3.6v?? [/quote]

No.

[quote user=""]Or can ADC measure only 0V ~ implied power supply voltage?[/quote]

Yes, only from 0 - VDD or 0 - intern ref

So you can set it to be 0 -1.8v.

Regards,
Jonathan

RE: nrf52 pcb external power supply

ENENER — Mon, 08 Mar 2021 15:52:59 GMT

I want to design my own nrf52 PCB.

And I'm looking at the nrf52832dk.

THANKS.

RE: nrf52 pcb external power supply

JONATHAN LL — Mon, 08 Mar 2021 14:28:05 GMT

Hi,

Are you planning on making a custom PCB daughter board for the nrf52 dk? Or do you want to design your own nrf52 PCB?

[quote user=""]I want to know TRACEDATA[0~3]'s role.[/quote]

The Tracedata pins are only required if you want to do a full instruction trace during debugging, but this requires dedicated trace hardware to use (the Segger chip on the development kits are not set up for this).

For regular debugging you only need the SWD pins (SWDIO and SWDCLK).

Are you looking at the nrf52832 dk or the nrf52840 dk ?

Regards,
Jonathan