How to measure power consumption on the DWM3001CDK

[kjun2288]

I would like to measure the power consumption of the DWM3001CDK.

I am trying to follow the instructions in the link below, but I noticed that the solder bridge jumper on J4 is already desoldered. While J6 and J16 are soldered, J4 is not.

Could you please provide some assistance with this? Thank you.

Measuring power consumption on DWM3001CDK Board

Hi @jul-nc see the image below. You should be ok with disconnecting: J16 - Segger power J6 - Segger RST signal J4 - disconnect the DWM from internal DCDC And apply power (3v3V) to J2 (upper pin, blue arrow) and connect GND to J1 upper pin (yellow arrow). But you need to take care bout GPIO output settings otherwise you would be able to to power up the Segger stuff via GPIO and that would cause unwanted leackage. [image] Cheers JK

[leapslabs]

Hi @kjun2288
is the J4 unsoldered from the factory? If the J4 is unsoldered then the J2 is supposed to be soldered and jumper must be populated on it as without it the DWM will not work.

Cheers
JK

[kjun2288]

As shown in the picture, I tested J4 for continuity with a digital multimeter, and the terminals are connected. Do I need to break this connection?

It doesn’t look like there’s any solder, so please let me know how to disconnect it.

[leapslabs]

Hi @kjun2288
from the picture the J4 is already break and the J2 connector is soldered with the jumper on it.

There are various setups for the current measurements. The most accurate is to remove all solder joins to fully disconnect the DWM1001 - this sill disconnect the segger IC and other related stuff which add some additional positive or negative leaking current. But also you will loose control over the DWM1001.

How do you want to measure the current? What tool do you want to use? And now precisely you wan to measure it?

Cheers
JK

[kjun2288]

I tested the continuity of J4 with a multimeter and it beeped, so I am wondering if it is actually disconnected.

For current measurement, I plan to use a data logger. I plan to measure only the current consumption of the DWM3001C as simply as possible.

Thank you.

[leapslabs]

Hi @kjun2288
please see the picture below - the J4 and J2 are in parallel:

Unfortunately there is no simply way, every connected GPIO line can/will lead to some increased/decreased current consumption. And when you go down to few uA this becomes super important. For proper measurement you need to disconnect the DWM3001 from anything that might affect the current consumption. → Thats practically all - SWD, UART, LEDS, RESET…

Cheers
JK

[rexxdad]

I used the battery connector to power the board , and can easily use a meter

[leapslabs]

Hi @rexxdad
thats not correct way how to measure it as this also power up the STM32 IC (Segger SWD flasher) so you get extra load.

Cheeres
JK

[rexxdad]

It measures the board, which is what I was after.