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Topics - robg

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OLEDs / NHD‐2.8‐25664UCB2 wiring
« on: August 02, 2016, 02:00:33 PM »
Hi,

I've had a bit of trouble getting the NHD‐2.8‐25664UCB2 working. In the process I noticed something strange.

On the PCB, it seems that the VCC supplied (nominally 3V), is connected to pin 25 of the display connector, which is VDD. Table 12-1 of the display datasheet http://www.newhavendisplay.com/app_notes/SSD1322.pdf says the maximum voltage on that pin should be 2.6V. It also indicates pins 24 and 26 should be connected to a voltage which can be up to 3.5V, whereas they are only wired to capacitors on the PCB, not the input VCC.
Figure 8-16 of the datasheet shows VDDIO and VCC both connected to 3.3V and VDD left unconnected as the internal regulator is being used, essentially the other way round to the PCB.

I'm surprised this hasn't caused issues if I'm reading it correctly, but maybe it's ok as clearly other people have the display working!

That datasheet also suggests VLSS and VSS should be connected together, which they don't appear to be.

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