nRF52840-DK where is VIO_REF pin

RE: nRF52840-DK where is VIO_REF pin

Chuan — Wed, 23 Nov 2022 14:34:25 GMT

Great, thanks for your help!

RE: nRF52840-DK where is VIO_REF pin

Kenneth — Wed, 23 Nov 2022 14:11:14 GMT

[quote user="Chuan"]I made a misunderstood. I mean put a 10kohm resistor between TP33 and GND. Is it ok ?[/quote]

Ah, That is fine yes.

Kenneth

RE: nRF52840-DK where is VIO_REF pin

Chuan — Wed, 23 Nov 2022 14:02:18 GMT

Hi Kenneth,

I made a misunderstood. I mean put a 10kohm resistor between TP33 and GND. Is it ok ?

Thanks

RE: nRF52840-DK where is VIO_REF pin

Kenneth — Tue, 22 Nov 2022 09:40:04 GMT

[quote user="Chuan"]When I try to ground TP33 to GND (it easy to make the connected point stable), the board works well. Is this way ok?[/quote]

It likely will work as long as you don't plan to connect any third party board for programming, then I suspect you will short gnd to vdd if you don't use a resistor.

Kenneth

RE: nRF52840-DK where is VIO_REF pin

Chuan — Tue, 22 Nov 2022 02:30:00 GMT

Hi Kenneth

The surface of R88 is too small and I can't solder a resistor to it with my equipments.

But when I try to put a 10kohm resistor to R88 by hands, it seems to work because I see the led bright, actually it blinks, may be by connected point is not stable.

When I try to ground TP33 to GND (it easy to make the connected point stable), the board works well. Is this way ok?

Thanks

RE: nRF52840-DK where is VIO_REF pin

Kenneth — Mon, 21 Nov 2022 13:19:47 GMT

I were not able to get hold of the one that designed the board, but can you try to place a ~10kohm resistor on R88 (close to TP33 and RESET pin on header P20). If that doesn't help, what are the switches on the DK set to?

Kenneth