Analyzing power consumption on nrf52840-DK with keysight N6705C

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

Jared — Fri, 23 Aug 2019 11:28:45 GMT

Hi,

Following the method described in the thread should not hurt the board. For more info, see our Power supply section in the documentation for the Devkit here.

Jared

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

gnrboy — Thu, 22 Aug 2019 09:24:31 GMT

[quote userid="69764" url="~/f/nordic-q-a/51139/analyzing-power-consumption-on-nrf52840-dk-with-keysight-n6705c/205198"][/quote]

Hi, I tried now with the zigbee light switch example, and it works with the setup you described.

Power through P21
SW10 to ON
SW6 to nRF only
SW9 to VDD
Plug in the USB cable (J2), to power the rest of the board
SB40/SB41 closed

With that setup I'm able to measure current going in to P21 and still toggle the light with the buttons

Yea that is question because that is from article which you have sent me to read? And sw10 (vext ->nrf) default off need to change to on thaht will separate powering via j2 and P21 ?

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

Jared — Thu, 22 Aug 2019 09:18:52 GMT

Hi,

[quote user="gnrboy"][/quote]

Its not burn or something else because now when only on j2 usb connected and via this connect all board have power (sw8 = ON, SW6=default, SW9 = VDD,sb40/sb41 are short (default)) ? sw10 (vext ->nrf) default off need to change to on thaht will separate powering via j2 and P21 ?

I'm not sure I understand what you're asking. Could you try to re-phrase the question? Are you asking if it's ok to supply the board with power from the USB and external power at the same time?

Jared

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

gnrboy — Thu, 22 Aug 2019 09:11:34 GMT

[quote userid="69764" url="~/f/nordic-q-a/51139/analyzing-power-consumption-on-nrf52840-dk-with-keysight-n6705c/205198"]Its not burn or something else because now when only on j2 usb connected and via this connect all board have power (sw8 = ON, SW6=default, SW9 = VDD,sb40/sb41 are short (default)) ? sw10 (vext ->nrf) default off need to change to on thaht will separate powering via j2 and P21 ?[/quote]

And this is ok? Is it possible to achieve this without connecting usb J2 to power Jlink and rest of the board?

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

Jared — Thu, 22 Aug 2019 09:05:12 GMT

[quote user="gnrboy"][/quote]

If I want to power buttosn and leds sw6 leave to default?

Yes, if you want to power the rest of the board then this should be default.

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

gnrboy — Wed, 21 Aug 2019 07:53:57 GMT

Hi, I tried now with the zigbee light switch example, and it works with the setup you described.

Power through P21
SW10 to ON
SW6 to nRF only
SW9 to VDD
Plug in the USB cable (J2), to power the rest of the board
SB40/SB41 closed

With that setup I'm able to measure current going in to P21 and still toggle the light with the buttons.

Its not burn or something else because now when only on j2 usb connected and via this connect all board have power (sw8 = ON, SW6=default, SW9 = VDD,sb40/sb41 are short (default)) ? sw10 (vext ->nrf) default off need to change to on thaht will separate powering via j2 and P21 ?

If I want to power buttosn and leds sw6 leave to default?

EDIT: Am I right?

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

Jared — Wed, 21 Aug 2019 07:31:34 GMT

Hi,

Please read this thread.

Jared

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

gnrboy — Tue, 20 Aug 2019 06:08:09 GMT

I using keysight as a battery emulator and it is then power supply and measure current consumption.

If then a just connect to external supply (p21) and how must be switches set ( to power nrf52840 and leds)

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

Jared — Mon, 19 Aug 2019 13:48:10 GMT

Hi,

It's enough to just cut the solder bridge, and set the Keysight to current measure mode.

regards

Jared

RE: Analyzing power consumption on nrf52840-DK with keysight N6705C

gnrboy — Mon, 19 Aug 2019 11:25:58 GMT

or I must connect keysight on p21 ?

which modification ?