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 Post subject: CF31 GPS power usage
PostPosted: Fri Aug 05, 2016 11:41 am 
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I have a CF31 mk3 with a original Leadtek GPS installed.
I also have a Custom-Toughbooks Ublox GPS for a CF-31. I think it is a 5 or 6 series.
Any one know the power usage for each? Which uses less power.

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 Post subject: Re: CF31 GPS power usage
PostPosted: Fri Aug 05, 2016 7:08 pm 
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A Leadtek LR95484S gps unit is supposed to have 165mW continious drain when turned on.
Not sure about the Ublox GPS.


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 Post subject: Re: CF31 GPS power usage
PostPosted: Fri Aug 05, 2016 7:25 pm 
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The Ublox is a LEA 6S

The product sheet lists it to use 121mw @ 3V for continuous

https://www.u-blox.com/sites/default/fi ... 002%29.pdf

I wonder how much of a difference that would make on battery life?

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 Post subject: Re: CF31 GPS power usage
PostPosted: Sat Aug 06, 2016 8:13 am 
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quick back of the envelope calculation

165-121=44mW per hour of runtime
roughly half a watt in 10-12 hours full charge ...
roughly 1 percent of battery life

best case 5-10 minutes additional runtime when choosing ublox instead of leadtek and having gps always on


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 Post subject: Re: CF31 GPS power usage
PostPosted: Sat Aug 06, 2016 8:37 am 
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Not much of a difference. Hmm.

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 Post subject: Re: CF31 GPS power usage
PostPosted: Sun Aug 07, 2016 4:13 pm 
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Actually the CF31 uses a LR9101. It uses 45mA of power. That converts to 148mW @3.3v

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