MTK GPS: how to add a backup battery?

Hi,

I have the MTK GPS basic board, without the backup battery. This has the very annoying effect of having to wait "forever" after each main battery disconnect. I understant that the GPS does a cold restart since it loses its RAM content. So the question is: can I connect a backup battery? How do I do this?

[In the attached picture: this is me waiting and waiting and waiting in vain for the GPS to lock...]

Dror

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Permalink Reply by d-creator on March 20, 2011 at 3:20pm
Hi Dror i found mkt datasheet, you only need wto leads of the battery to the board. I'll try to upload the file.
Permalink Reply by d-creator on March 20, 2011 at 3:34pm
There you go. If you need any help call: 0547-655-945
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Permalink Reply by Dror Caspi on March 22, 2011 at 11:25am

Thanks.  It seems pretty straightforward to connect a backup battery: disconnect the 150 Ohm resistor between pin 4 and 3.3v, and connect a battery between pin 4 and GND.  Now I need to get a battery & holder (maybe from an old PC motherboard).

Dror

Permalink Reply by Shawn on March 20, 2011 at 3:40pm

I have also timed this process..it seems you need to wait at least 5 minutes for a decent number locked, the longer (20 minutes>) the better...must be a faster/better way?

 

Permalink Reply by d-creator on March 24, 2011 at 1:58am
Dror i have tons of these holders... in many variations
Permalink Reply by Dror Caspi on March 24, 2011 at 2:00am

Thanks, I already bought one.  I will probably connect it this weekend.

 

Dror

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