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Power Usage for 2.8 TFT
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Power Usage for 2.8 TFT

by destockwell on Sun Sep 06, 2020 6:49 pm

What are the power requirements for these displays? Both voltage (5.0v or 3.3v?). What current draw?

Planning to drive my Pi-ZeroW build from 3.7v Lithium with 3.7-5.0 buck-boost circuit. While also adding low voltage shutdown, charging circuit, etc.

Thanks in advance.

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Re: Power Usage for 2.8 TFT

by dastels on Sun Sep 06, 2020 7:41 pm

Specifically, what product?

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Re: Power Usage for 2.8 TFT

by destockwell on Mon May 10, 2021 11:40 pm

Missed your response...sorry. Specifically product 1770

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Re: Power Usage for 2.8 TFT

by dastels on Tue May 11, 2021 11:26 am

Going on the datasheet [url]file:///home/dastels/Downloads/MI0283QT-11+V1.1.PDF[/url]:
the backlight take 80mA "typically"
I also see a "module power consumption" of 220mW which would be at 3.3v (there is an onboard 3.3v regulator) which gives 60mA
So 140mA under pretty heavy use (I see their specs with with a white screen and backlight on), plus a few more mA for the various interface chips on the breakout. Plus the SD card would add a touch more if it's being used.

The onboard regulator can output 150mA so the above estimate sounds about right.

To get "real" numbers you'd have to measure.

Dave

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