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Author Topic: BT816 signal level on RGB interface  (Read 113 times)

Spyy

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BT816 signal level on RGB interface
« on: January 05, 2021, 12:16:32 PM »

Hi,

i am using the BT816 chip in my design and i am struggeling a bit. I supply the BT816 chip with 3.3V for VCCA, VCCIO1, VCCIO2 and VCCIO3. VOUT1V2 is on 1.2V as forseen.
Now my issue:
On the RGB lines, where i can see active pulsing signals (BACKLIGHT, DE, VSYNC, HSYNC, DISP, PCLK), i only measure approx 0.8V-1V. I connected those lines via 33Ohms in serial to a ST7701S chip. It seems that this signal level is too low for this chip which is also on 3.3V.
So my question is: Is this signal level normal ? I tried to force the signal strenth via register to higher amps without success.
What can i do here?

Thank you a lot

Torsten
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Re: BT816 signal level on RGB interface
« Reply #1 on: January 05, 2021, 06:15:25 PM »

Hello,

Thank you for your question.
Would it be possible for you to provide your schematic?

VCCIO2 is the supply concerned with the RGB and touch I/O pins, when supplied with 3V3 you should see 3v3 signals on the applicable pins.

Could you confirm that the RGB pins are driven at 3v3 when the ST7701S is disconnected?

Best Regards,
BRT Community
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Spyy

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Re: BT816 signal level on RGB interface (solved)
« Reply #2 on: January 07, 2021, 10:27:39 PM »

Hi,

thank you for your quick response....i disconnected the ST7701 from the BT81x and level is still low....so i assume the device is damaged...will try with a new one...

Thank you

Torsten
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Re: BT816 signal level on RGB interface
« Reply #3 on: January 08, 2021, 04:20:37 PM »

Hello,

Please keep us updated with how you get on replacing the device.

Best Regards,
BRT Community
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