Power on VU7C independently

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zyssai
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Power on VU7C independently

Post by zyssai »

Hi.

How to power VU7C screen without using C4 or N2+ ?
I looked out the schematics but I don't want to damage the screen.

I think I need ground,
pin1 for 3.3v
pin2 for 5v
Pin12 for brightness control
Pin 27, 28, 29, 31 for touchscreen
Pin 38 don't know what it is ?

Is it sufficient? Did I miss something?

Any help appreciated, thanks!

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odroid
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Re: Power on VU7C independently

Post by odroid »

There is no way to use the Vu7C without C4/N2 because the HDMI interface IC must be initialized via I2C bus from the N2/C4 CPU.
Note that HDMI interface IC LT8619C initialization code was merged into u-boot since official Android OS image 2022 Feb 22nd version.
https://wiki.odroid.com/odroid-c4/os_im ... 4_20220222

You can ignore Pin 38 which is a 1.8Volt power rail.
But, you have to connect Pin 23, 24 and 36 to the C4/N2 for proper and essential initialization process of the LT8619C chip.
Otherwise, there will be nothing on the screen.

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zyssai
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Re: Power on VU7C independently

Post by zyssai »

Thanks for your help ;)

In fact, I will use N2+, but the reason I ask this is that I need to use some gpio pins with shutdownservice app by joerg.

So I can't connect directly N2+ to the gpio header, and need to know what pins are needed for VU7C

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Re: Power on VU7C independently

Post by odroid »

Pin # 8, 10, 11, 13, 15, 16, 18, 19, 21, 22, 26, 32, 33, 35, 37 and 40 are still available for your application as shown in the Vu7C schematics.
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zyssai (Wed Aug 03, 2022 8:37 pm)

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zyssai
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Re: Power on VU7C independently

Post by zyssai »

It's more than what I need, thanks!

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