How can I minimize operating current as lower as possible?

RE: How can I minimize operating current as lower as possible?

JY wu — Thu, 16 Jan 2025 15:13:04 GMT

Hi~

About your questions:

1. Have you tried measuring the sleep current yourself with a ampmeter?

NO, job of measuring current is done by our hardware partner.

2. And what is the expected idle current for the g-sensor in the state it is in?

It's around 36 uA according to it's datasheet.

But huge thanks for your help, I think we have to measure current by ourself first.

RE: How can I minimize operating current as lower as possible?

Vidar Berg — Thu, 16 Jan 2025 10:08:57 GMT

I'm afraid this doesn't really help us troubleshoot the problem. I still don't know if the current measurement setup is able to correctly measure the sleep current of the chip, how much current the sensor will draw in this state, how your FW is configured, etc. Have you tried measuring the sleep current yourself with a ampmeter? And what is the expected idle current for the g-sensor in the state it is in?

RE: How can I minimize operating current as lower as possible?

JY wu — Wed, 15 Jan 2025 15:08:22 GMT

Hi~

About questions:

1. Did you try to load the 'system_on_current_meas_test.hex' I included in the *.zip?

Ans: No, out engineer told me, they modify main.c to two projects. one is all sleep, the other is all on.

2. Does this include the current going into the sensor?

Ans: Since G-sensor is not activated, what I can tell is "G-sensor has power supply, but not activated."

RE: How can I minimize operating current as lower as possible?

Vidar Berg — Wed, 15 Jan 2025 14:00:55 GMT

Hi,

[quote user="JY wu"]

But we can't run you code directly, maybe Device Tree confliction?

[/quote]

What happens when you try to run it on your board? Did you try to load the 'system_on_current_meas_test.hex' I included in the *.zip?

[quote user="JY wu"]

Here is the measurement:

This is all sleep, max 129 uA, average 0.846 uA

[/quote]

Does this include the current going into the sensor?

RE: How can I minimize operating current as lower as possible?

JY wu — Tue, 14 Jan 2025 19:31:29 GMT

Hi!

Our hardware partner measured current for us.

But we can't run you code directly, maybe Device Tree confliction?

So we seperate to two parts, one is always sleep, the other always on.

Here is the measurement:

This is all sleep, max 129 uA, average 0.846 uA

This is all busy, max 4.165 mA, average 3.331 mA

Is this information useful?

RE: How can I minimize operating current as lower as possible?

Vidar Berg — Thu, 09 Jan 2025 12:30:37 GMT

Happy new year!

It's a bit difficult to see from the pictures what is happening and what the floor current is. If possible, please try to measure the board with the attached FW. This may help us verify the measurement setup.

Here's the measurement result I got when ran this FW on a nRF52840 DK

devzone.nordicsemi.com/.../system_5F00_on_5F00_test.zip

RE: How can I minimize operating current as lower as possible?

JY wu — Tue, 07 Jan 2025 16:36:15 GMT

Happy new year !

Our hardware partner send us current profile picture as attached file.

Average current listed at top right, we use RED rectangle to mark it. The reading is : 513.864 uA

This is normal operation avergae current for 30 seconds.

In this scenario, nrf52840 sleeps every 50ms.

RE: How can I minimize operating current as lower as possible?

Vidar Berg — Thu, 02 Jan 2025 11:13:04 GMT

Hello,

In one of your previous tickets you mentioned having a PPK2. Can you please share your measurements you have made with this? I'm particularly interested in the idle current between the advertisements.

Best regards,

Vidar