Current comsumption on LFRC

RE: Current comsumption on LFRC

Jørgen Holmefjord — Thu, 13 Jul 2023 13:57:09 GMT

[quote user="gvantuil"]If you know why this module (e104-bt5010a) draws such current, I would like to know, either to fix it or avoid it in my future designs.[/quote]

Unfortunately, I do not know what the additional current draw in this module comes from. I would recommend that you check this with the module manufacturer.

RE: Current comsumption on LFRC

gvantuil — Wed, 12 Jul 2023 16:57:07 GMT

Oh, I just found out the problem: the module I was using for some reason has a minimum sleep current of 8uA.

Initially I thought that was a software limitation of the application that comes with the module. But it looks like it isn't.

About the 0.8uA I think was a mistake, I've uploaded a third party program and then mine, but did not erased the whole chip, so there was fragments of the old code that were causing that small current, while mine was not running (I've tested only for current, not the funcionality).

I've tested on another board and its working fine (1.5uA exactly).

If you know why this module (e104-bt5010a) draws such current, I would like to know, either to fix it or avoid it in my future designs.

Thanks very much for the promptly reply!

RE: Current comsumption on LFRC

Jørgen Holmefjord — Wed, 12 Jul 2023 07:55:43 GMT

Hi,

The configs are correct for changing the clock config for the SoftDevice Handler library from Xtal to RC, but if you use the LFCLK outside this library, or use the SoftDevice APIs directly to enable the SoftDevice, you will need additional/other changes. Is the application working correctly apart from the higher current consumption?

What kind of application is running on the device? Is the measured current consumption the average over time, or just the sleep current?

0.8 uA sounds lower than expected for System ON with RTC running from LFXO, are you sure this is correct? Have you verified that the application runs correctly on this module?

Best regards,
Jørgen