Measurement of nrf chip only

RE: Measurement of nrf chip only

ovrebekk — Mon, 08 Jan 2018 14:50:20 GMT

The LED's are sinked and not sourced, so they should not contribute to the current draw.

You should not need to disconnect any other solder bridges, no. Are you still seeing excessive current draw?
What do you measure, and what do you expect to measure?

Best regards

RE: Measurement of nrf chip only

NY — Fri, 05 Jan 2018 20:40:31 GMT

I disconnected the SB9 solder bridge.

I measured LEDs as well as nrf chips.

So, I disconnected SB5 ~ SB8 to invalidate the LED.

Do I need to disconnect other SB solder bridges?

Thank you for your reply.

RE: Measurement of nrf chip only

ovrebekk — Tue, 02 Jan 2018 13:42:38 GMT

Yes, this is the way it works when you connect the PPK to a standard nRF52DK (PCA10040).

Have you disconnected the SB9 solder bridge, as detailed in the PPK Quick start?
If not the measurements will not be accurate.

Best regards

RE: Measurement of nrf chip only

NY — Sat, 30 Dec 2017 15:46:28 GMT

I would like to measure only the current drawn by the nRF52 chip as in the following article.

devzone.nordicsemi.com/.../

In particular, I would like to measure with Power Profiler Kit (PPK).

RE: Measurement of nrf chip only

NY — Sat, 30 Dec 2017 14:59:09 GMT

Thank you for your reply.regards.

RE: Measurement of nrf chip only

ovrebekk — Fri, 29 Dec 2017 13:55:43 GMT

I am a bit uncertain what you mean.

The chip with the PCA10040 sticker on it is a standard Atmel AVR chip that is used for programming the nRF52832. This device is not included in the power measurements when you use the PPK.

The only thing you are measuring is the current consumption of the nRF52832 device, and also the current being sourced (output) from the GPIO's on the nRF52832.

Best regards
Torbjørn