Recently got my DS3231 and have questions to ask...
Hi there,
I recently got my DS3231 module labeled ZS-042 off from http://www.kynix.com/Detail/99971/DS3231.html and it came with a CR2032 3V battery.
The module works at 3.3V and also 5V however after some days of usage at 5V I noticed that the battery has become quite "thick". A quick check with the multimeter confirms that the module force-charges the battery with VCC! Not quite nice.
Here a pic:

So you should at least power this module only at 3.3V, even then, question to the experts:
is it save to "charge" a 3V CR2032 at 3.3V continuously without it breaking after some time?
2nd question: is it ok to charge a LIR2032 at 5V?
Other than that the module works quite well with the time library.
Best regards!
I recently got my DS3231 module labeled ZS-042 off from http://www.kynix.com/Detail/99971/DS3231.html and it came with a CR2032 3V battery.
The module works at 3.3V and also 5V however after some days of usage at 5V I noticed that the battery has become quite "thick". A quick check with the multimeter confirms that the module force-charges the battery with VCC! Not quite nice.
Here a pic:

So you should at least power this module only at 3.3V, even then, question to the experts:
is it save to "charge" a 3V CR2032 at 3.3V continuously without it breaking after some time?
2nd question: is it ok to charge a LIR2032 at 5V?
Other than that the module works quite well with the time library.
Best regards!
0
Comments
Anyway. The most 2032 cells are not chargeable, so desolder the trickle charger circuit (I googled the schematic and there is a 200 Ohm resistor and some random diode, desolder one or both). Also keep in mind any non-chargeable cell if cracked may actually burn up, and there is always a warning text stating that
Ah, ic, I think it would be best to use a supercap instead of the CR/LIR battery, something like this:
How about that?
Actually, I wanted to use the ds3231 to send an interrupt every second to my arduino pro mini (5V). There are some libs that set up the ds3231 to do just that however not the most cited one maybe.
Have a nice day!
To appropriately charge a Lithium-Ion cell you need to have a decent consistent current stockpile that is programed to incline the voltage appropriately for a lithium-particle. Conditions for over-tempeature and over-voltage *must* be considered, other insightful, the battery can (and will) detonate.
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