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Tips, tricks, & best best practices using Artemis with your board designs.
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By adam.g
#213031
Hi guys,

Has anyone come across what the actual deviation in ppm is for the Artemis' RTC? I've been digging through the Apollo3 Blue datasheet, but haven't come across any accuracy values yet. I'm very curious to know how it would operate across a wide range of temperatures.

Cheers,
Adam
By stephenf
#213531
Hi Adam, I can report that over a month of deployment at 7degC, the RTC kept correct time to within a couple of seconds (and probably better).
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By adam.g
#213541
Hi Stephen,

Thanks for your reply. I've recently done some tests with the Artemis against the Maxim DS3231SN, which has an accuracy of ±3.0 ppm over the temperature range -40°C to +85°C. Considering that it's integrated with the Apollo3 and is not temperature-compensated, I've found the Artemis to perform quite well.

Subjecting an Artemis Nano to significant temperature swings produced 1-2 seconds of drift over 24 hours. This equates to an error of approximately 15-30 ppm. I imagine at a constant temperature above 0°C it'd be much more stable.
artemis_ds3231sn.png
Cheers,
Adam
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By stephenf
#213619
Wow that's quite a bit, although hopefully for "room temperatures" it's more negligible. Thanks for doing the testing.
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