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Datasheet help

post #1 of 5
Thread Starter 
Hi Guys,
Sorry if this is in the wrong section, I couldnt find "Hobbyist Electronics" anywhere.

I need some help with interpreting this data sheet:
http://www.farnell.com/datasheets/1444177.pdf

Specifically, Pins 47-48(VDD)

The logic voltage(Whatever that is) is 3.3V.
Do I supply the VDD(Pins47,48) with 3.3V or 5V*?

*Note 1 below pinout, Page 7 of 13.

Thanks for the help smile.gif
Big Black Guy
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Big Black Guy
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post #2 of 5
From what I could gather from that document and from my very limited experience with electronics, I'd say 3.3V. But please don't just take my word for it.
post #3 of 5
Those are some lousy datasheets.
It looks like the pins to the IC get 3.3V while the separate LCD power pins are 5V as seen on page 6 of 13.
Page 8 of 13 also references 3.3V for the digital logic and 5V for the analog connections.
post #4 of 5
Thread Starter 
Quote:
Originally Posted by hajile View Post

Those are some lousy datasheets.
It looks like the pins to the IC get 3.3V while the separate LCD power pins are 5V as seen on page 6 of 13.
Page 8 of 13 also references 3.3V for the digital logic and 5V for the analog connections.

Ah, I missed that separate dupont. Why would they do that? Just make 5V into on of the unused pins. Oh well tongue.gif Thanks both of you for the help smile.gif
Big Black Guy
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Big Black Guy
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post #5 of 5
The likely answer is the ampacity of the 5V circuit is higher than the allowable Ampacity of the IC. In this case, they would need to modify the IC and likely increase manufacturing costs -- something they are likely averse to doing.
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