RTC Battery Backup

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User avatar
LaloARM
Posts: 14
Joined: Wed Jul 19, 2017 12:58 am

Thu Aug 17, 2017 6:06 pm

Hi
I would like to know if it is possible to implement a battery for rtc, my LP will not be connected to a wifi, so the time and date can not be updated by that means. There is a JST type connector that is not well installed on my LP on the back side, is that connector for a battery for the RTC? :geek:

User avatar
LazyBunny
Posts: 65
Joined: Mon Oct 24, 2016 10:38 pm
Location: USA
Contact:

Thu Aug 17, 2017 11:45 pm

There is a spot where one can be soldered on. But you have to be VERY good at soldering.
viewtopic.php?t=987
my second post on that thread also has the connector you can get from molex. possibly order a free sample. Though if i were you.. get 5.
and the battery i purchased.
For me, soldering it on was fairly easy, but that's not the case for most people as it's very tiny.
I too had to use the battery since it wouldn't always be connected to the internet, but timestamps had to be perfect. IMO, the next Lattepanda should have a connector or at very least a soldered on mini RTC battery similar to the ones in the PSP (about the size of an M&M, or round tablet pill).
https://www.elotrolado.net/w/images/d/d ... Ta-079.jpg
On the far right.

Well good luck. you can use my pictures as reference for polarity.
My Gameboy: http://imgur.com/a/lhY1x
My SBC Joystick: http://imgur.com/a/vtc5C
My Rockin' Dreamcast: http://imgur.com/a/kI50p
I'm Kiera, the Laziest Bunny in all of Bunny Town.

User avatar
LaloARM
Posts: 14
Joined: Wed Jul 19, 2017 12:58 am

Fri Aug 18, 2017 7:28 pm

Hi,
Thanks for the quick response, I was reading the link forum and there are problems with the international transfer of the li-ion battery by plane. Although they had to leave the connector and that each of us bought the battery in their respective country. In my case will not be problem since I am an electronic engineer and I have no problem soldering. I only have one question left. What model of battery do you use, I ask that when measuring on the positive of the connector there is a voltage of 2.5v which tells me that the battery to be installed is rechargeable?

User avatar
LaloARM
Posts: 14
Joined: Wed Jul 19, 2017 12:58 am

Fri Aug 18, 2017 7:36 pm

Sorry, I did not notice that the link appears in the model. :oops:

Thank you

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LazyBunny
Posts: 65
Joined: Mon Oct 24, 2016 10:38 pm
Location: USA
Contact:

Sun Aug 20, 2017 10:17 am

Not sure if it wants a rechargeable, i'm just using that generic coin cell and i've had no problems with it. It keeps time well enough. If it is feeding a back current, it's not much since i had my panda on for many hours and the coin cell hasn't bulged or popped. Not sure if they intended it to be rechargeable though. Would have to get the Lattepanda devs in to answer that one, since i haven't a clue, there's no schematics available.

Some places have regulations against any batteries, not just li-ion cells. So i don't know which it would be. Though LR2032s are easy enough to find too if you want to try one of those instead.

When putting the connector on, just watch out for the tiny resistors near by. Don't want to accidentally pick one up, they are super tiny.
My Gameboy: http://imgur.com/a/lhY1x
My SBC Joystick: http://imgur.com/a/vtc5C
My Rockin' Dreamcast: http://imgur.com/a/kI50p
I'm Kiera, the Laziest Bunny in all of Bunny Town.

User avatar
LaloARM
Posts: 14
Joined: Wed Jul 19, 2017 12:58 am

Thu Aug 24, 2017 3:54 pm

LP is a good product, but I am concerned about little or no intervention on some of these hardware issues by the developers in this is an official product forum, as it is in this case. :?

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LazyBunny
Posts: 65
Joined: Mon Oct 24, 2016 10:38 pm
Location: USA
Contact:

Thu Aug 24, 2017 4:07 pm

It's a pretty small team and they're in R&D phases now. The community isn't very big either, which is a shame since the LP is an amazing product.
My Gameboy: http://imgur.com/a/lhY1x
My SBC Joystick: http://imgur.com/a/vtc5C
My Rockin' Dreamcast: http://imgur.com/a/kI50p
I'm Kiera, the Laziest Bunny in all of Bunny Town.

User avatar
LattePanda
Site Admin
Posts: 2436
Joined: Wed Jan 20, 2016 9:09 am

Thu Sep 14, 2017 3:28 am

Hi,
We recommend using Molex 53261- 0271 http://www.molex.com/molex/products/dat ... partdetail on the board and connect a 3V battery for it.
BTW. cool project of Gameboy PI , love it
Enjoy Tinkering with LattePanda ! :lol:

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calpin
Site Admin
Posts: 22
Joined: Fri Apr 15, 2016 9:21 am

Thu Sep 14, 2017 3:35 am

Some people even use a ultra capacitor to keep the power for RTC

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ED209
Posts: 222
Joined: Tue Apr 19, 2016 3:31 pm

Thu Sep 14, 2017 9:18 am

calpin wrote:
Thu Sep 14, 2017 3:35 am
Some people even use a ultra capacitor to keep the power for RTC
Sounds like that's a very smart way to do that. Do you have any idea about how much capacitance is good?

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