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By adam.g
#224023
Hi folks,

I've been noticing that when using the Artemis Processor + MicroMod Data Logging Carrier Board (MMDLCB), the RTC does not keep its time when unplugged. To test this, I charged the battery for 24 hours and then unplugged power to the MMDLCB for two minutes. Even after this short time, the battery-backup seems to discharge to the point where it's no long able to maintain the RTC.

I'm curious if anyone has any thoughts on what could be wrong. I did see there was another post about the RP2040 Processor and how its RTC_3V pin is tied directly to 3.3V. I wonder if this could be a related issue.

Cheers,
Adam
Code: Select all
08:31:30.651 -> SparkFun RTC Example
08:31:30.651 -> It is now 12:31:31.40 03/15/21 Day of week: 1 = Monday
08:31:31.657 -> It is now 12:31:32.40 03/15/21 Day of week: 1 = Monday
08:31:32.673 -> It is now 12:31:33.41 03/15/21 Day of week: 1 = Monday
08:31:33.665 -> It is now 12:31:34.41 03/15/21 Day of week: 1 = Monday
08:31:34.678 -> It is now 12:31:35.42 03/15/21 Day of week: 1 = Monday
08:31:35.683 -> It is now 12:31:36.42 03/15/21 Day of week: 1 = Monday
08:31:36.690 -> It is now 12:31:37.43 03/15/21 Day of week: 1 = Monday
08:31:37.693 -> It is now 12:31:38.43 03/15/21 Day of week: 1 = Monday
08:31:38.690 -> It is now 12:31:39.44 03/15/21 Day of week: 1 = Monday
08:31:39.692 -> It is now 12:31:40.44 03/15/21 Day of week: 1 = Monday
08:31:40.716 -> It is now 12:31:41.45 03/15/21 Day of week: 1 = Monday
08:31:41.722 -> It is now 12:31:42.45 03/15/21 Day of week: 1 = Monday
08:31:42.718 -> It is now 12:31:43.45 03/15/21 Day of week: 1 = Monday
08:31:43.705 -> It is now 12:31:44.46 03/15/21 Day of week: 1 = Monday
08:31:44.733 -> It is now 12:31:45.46 03/15/21 Day of week: 1 = Monday
08:31:45.725 -> It is now 12:31:46.47 03/15/21 Day of week: 1 = Monday
08:31:46.718 -> It is now 12:31:47.47 03/15/21 Day of week: 1 = Monday
08:31:47.722 -> It is now 12:31:48.48 03/15/21 Day of week: 1 = Monday
08:31:48.738 -> It is now 12:31:49.48 03/15/21 Day of week: 1 = Monday
08:31:49.748 -> It is now 12:31:50.49 03/15/21 Day of week: 1 = Monday
08:31:50.763 -> It is now 12:31:51.49 03/15/21 Day of week: 1 = Monday
08:31:51.773 -> It is now 12:31:52.50 03/15/21 Day of week: 1 = Monday
08:31:52.759 -> It is now 12:31:53.50 03/15/21 Day of week: 1 = Monday
08:31:53.760 -> It is now 12:31:54.50 03/15/21 Day of week: 1 = Monday
08:31:54.773 -> It is now 12:31:55.51 03/15/21 Day of week: 1 = Monday
08:31:55.781 -> It is now 12:31:56.51 03/15/21 Day of week: 1 = Monday
08:31:56.791 -> It is now 12:31:57.52 03/15/21 Day of week: 1 = Monday
08:31:57.777 -> It is now 12:31:58.52 03/15/21 Day of week: 1 = Monday
08:31:58.777 -> It is now 12:31:59.53 03/15/21 Day of week: 1 = Monday
08:31:59.784 -> It is now 12:32:00.53 03/15/21 Day of week: 1 = Monday <- Unplugged power
08:34:01.698 -> SparkFun RTC Example <- Plugged power back
08:34:01.976 -> It is now 0:00:01.69 01/01/00 Day of week: 0 = Sunday
08:34:02.970 -> It is now 0:00:02.68 01/01/00 Day of week: 0 = Sunday
08:34:03.963 -> It is now 0:00:03.68 01/01/00 Day of week: 0 = Sunday
08:34:04.959 -> It is now 0:00:04.69 01/01/00 Day of week: 0 = Sunday
08:34:05.994 -> It is now 0:00:05.69 01/01/00 Day of week: 0 = Sunday
08:34:06.970 -> It is now 0:00:06.69 01/01/00 Day of week: 0 = Sunday
08:34:07.985 -> It is now 0:00:07.70 01/01/00 Day of week: 0 = Sunday
08:34:09.001 -> It is now 0:00:08.70 01/01/00 Day of week: 0 = Sunday
08:34:09.990 -> It is now 0:00:09.70 01/01/00 Day of week: 0 = Sunday
08:34:11.003 -> It is now 0:00:10.71 01/01/00 Day of week: 0 = Sunday
08:34:12.000 -> It is now 0:00:11.71 01/01/00 Day of week: 0 = Sunday
08:34:12.997 -> It is now 0:00:12.71 01/01/00 Day of week: 0 = Sunday
08:34:14.007 -> It is now 0:00:13.72 01/01/00 Day of week: 0 = Sunday
08:34:14.990 -> It is now 0:00:14.72 01/01/00 Day of week: 0 = Sunday
08:34:16.009 -> It is now 0:00:15.72 01/01/00 Day of week: 0 = Sunday
08:34:17.017 -> It is now 0:00:16.72 01/01/00 Day of week: 0 = Sunday
08:34:18.016 -> It is now 0:00:17.73 01/01/00 Day of week: 0 = Sunday
08:34:19.009 -> It is now 0:00:18.73 01/01/00 Day of week: 0 = Sunday
08:34:20.005 -> It is now 0:00:19.73 01/01/00 Day of week: 0 = Sunday
08:34:21.033 -> It is now 0:00:20.74 01/01/00 Day of week: 0 = Sunday
08:34:22.029 -> It is now 0:00:21.74 01/01/00 Day of week: 0 = Sunday
08:34:23.039 -> It is now 0:00:22.74 01/01/00 Day of week: 0 = Sunday
08:34:24.018 -> It is now 0:00:23.75 01/01/00 Day of week: 0 = Sunday
08:34:25.032 -> It is now 0:00:24.75 01/01/00 Day of week: 0 = Sunday
08:34:26.052 -> It is now 0:00:25.75 01/01/00 Day of week: 0 = Sunday
08:34:27.052 -> It is now 0:00:26.75 01/01/00 Day of week: 0 = Sunday
08:34:28.042 -> It is now 0:00:27.76 01/01/00 Day of week: 0 = Sunday
08:34:29.049 -> It is now 0:00:28.76 01/01/00 Day of week: 0 = Sunday
08:34:30.039 -> It is now 0:00:29.76 01/01/00 Day of week: 0 = Sunday
08:34:31.059 -> It is now 0:00:30.77 01/01/00 Day of week: 0 = Sunday
User avatar
By TS-Chris
#224042
Hi Adam.

I think that's most likely what's causing the issue. It looks like by connecting the two pins on the processor board the RTC battery is trying to power the RTC and the rest of the processor board at the same time. Since the battery has such a small capacity, it drains really fast. I'll let our engineers know and see if they can come up with a fix.
User avatar
By adam.g
#224100
Thanks, Chris!

Are you able to clarify whether it's the circuitry on the Artemis Processor or the MicroMod Data Logging Carrier Board that's causing the RTC battery to drain?

Cheers,
Adam
User avatar
By TS-Chris
#224411
It looks like a design issue, engineering is aware and there may be a revision later on.
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