RTC Battery Backup

The official pyboard running MicroPython.
This is the reference design and main target board for MicroPython.
You can buy one at the store.
Target audience: Users with a pyboard.
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JimTal001
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Joined: Thu Jul 30, 2015 4:59 pm

RTC Battery Backup

Post by JimTal001 » Thu Aug 27, 2015 4:36 pm

Can someone please point me to the documentation related to adding the optional backup battery for the RTC?
Thanks
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dhylands
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Re: RTC Battery Backup

Post by dhylands » Thu Aug 27, 2015 4:58 pm

I don't think that there is any docs. The only thing I found was on this quick-start page:
http://docs.micropython.org/en/latest/p ... ckref.html

You can connect a battery betwen VBAT and Ground.

The STM32F405 data sheet says that VBat needs to be between 1.65V and 3.6V
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JimTal001
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Joined: Thu Jul 30, 2015 4:59 pm

Re: RTC Battery Backup

Post by JimTal001 » Thu Aug 27, 2015 5:53 pm

Thanks for the info.

On the quick-start page the drawing shows VBAT connecting to the two pins above the X22 label. Does that mean the 3.0V battery lead connects to either of the two pins or both?
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blmorris
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Location: Massachusetts, USA

Re: RTC Battery Backup

Post by blmorris » Thu Aug 27, 2015 6:19 pm

No, the VBAT pin is the on above X22; X22 is the pin in the outer row, VBAT is the pin in the inner row. Connect the positive terminal of the battery to VBAT, and the negative terminal to ground.

-Bryan
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