0.96" mini Color OLED - Unused Data Lines

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szczurherman
 
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0.96" mini Color OLED - Unused Data Lines

Post by szczurherman »

Hello,

I have been using your "OLED Breakout Board - 16-bit Color 0.96" w/microSD holder" product without any problems.

According to your schematic the unused data lines (when using SPI interface) are unconnected, but according to many other sources and especially the SSD1331 controller datasheet, it is required for unused data lines to be tied to ground, if the SPI interface is being used (see attached interface selection table).

My question is, is there any reason that you have left unused pins unconnected, perhaps to make soldering easier during manufacturing?

Best regards
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interface_selection_table.jpg (274.42 KiB) Viewed 55 times

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adafruit_support_mike
 
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Re: 0.96" mini Color OLED - Unused Data Lines

Post by adafruit_support_mike »

szczurherman wrote: Sun Jan 15, 2023 8:26 am is there any reason that you have left unused pins unconnected
In this case the limiting resource is board space. Even with a resistor array, the traces from the FPC to the resistors, the footprint for the part, and then traces to GND would fill a large fraction of the available PCB area.

As you've seen, our testing showed that the display works without any problems if the pins are left unconnected. So we made the call to leave out the pull-downs in order to reduce the size of the board.

Datasheets show the version of a circuit that's most likely to work under any conditions (and least likely to generate phone calls for the applications engineers). They make excellent starting points, but don't replace characterization and testing in your own circuit and operating environment.

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