(TECH) GPS xadow board battery backup

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rhbroberg
Pre-kindergarten
Pre-kindergarten
Posts: 27
Joined: Thu Feb 04, 2016 12:20 pm

(TECH) GPS xadow board battery backup

Post by rhbroberg » Fri Apr 22, 2016 12:55 am

The Quectel L70 GPS chip on the xadow board has a pin, V_BCKUP, which is meant to be supplied with a battery to allow the location data to be preserved even during power loss to Vcc (hardware reference diagram mentions a particular coin cell battery).

The schematic file URL

http://www.seeedstudio.com/wiki/images/ ... GPS_v2.rar

referenced in the wiki page

http://www.seeedstudio.com/depot/Xadow- ... -2557.html

takes me to a rar file which is not valid. I cannot determine if the 3v3 pad on the bottom of the board is wired to that pin or not. Does somebody here have a link to a valid schematic file, or a definitive answer about that pin?

Thanks

dbelam
Elementary-1
Elementary-1
Posts: 157
Joined: Wed Feb 03, 2016 2:59 am

Re: (TECH) GPS xadow board battery backup

Post by dbelam » Sat Apr 23, 2016 1:20 am

The rar file is perfectly valid for me, and it shows that the V_BCKP is totally there, R5 0 Ohm resistor connects it to 3.3V - that means you can desolder it to add a backup battery, that is not connected to the main 3.3V (therefore won't supply anything but the GPS)

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