I notice that the Newhaven datasheet shows a resistor network between VR, VOUT, and V0.
The Newhaven display uses the ST7565P controller. According to the datasheet for this controller, there should be operating modes that do not require any connection to VR. I should be able to use the internal regulator and set the contrast using a series of commands to the unit.
Am I missing something? Has the internal contrast control logic been disabled in the Newhaven unit? Is it the only available option to redesign my circuit so as to use an external resistor network to set VR?
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