Tab5 RTC backup battery specifications

easytarget

I'm wondering if anybody can answer this; the Tab5 has a RTC chip with a dedicated backup battery on the PCB:

Does anybody have electrical specs for this part? or a part number? It would be really handy to have this info.

The rx8310 RTC chip has a number of settings for controlling and monitoring it's backup battery, it can charge rechargeable ones (for instance) and has configurable switching levels.
You need to know what type/capacity of battery you are working with to set this up correctly. The defauls are for a simple non-rechargable cell. Is this what the Tab5 has?

sam_20

@easytarget, I found out where’s the battery in the schematics pdf, but it doesn’t say what is the battery type

felmue

Hello guys

it is listed in the specifications here.

RTC Chip: RX8130CE (supports timed interrupt wake-up), RTC supercapacitor specification: 70000μF/3.3V, size Φ4.8×1.4mm

Edit: If I am not mistaken RTC battery charging is enabled with this line in M5Unified library.

Thanks
Felix

sam_20

This post is deleted!

sam_20

@felmue ok, but is the battery always have to be swapped every time it’s faulty?

felmue

hmm, I don't think I understand you statement. Doesn't every electronic part that's faulty need to be swapped? What am I missing here?

Thanks
Felix