VCC for Monochrome 1.3" 128x64 OLED graphic display - STEMMA QT / Qwiic

[mikemontauk]

Monochrome 1.3" 128x64 OLED graphic display - STEMMA QT / Qwiic
Product ID: 938

Datasheet indicates UG-2864KSWLG01 pin 28 is Supply Voltage for Display/power supply for OEL panel, but schematic shows no input to pin 28. The datasheet then indicates “1.6.2 VCC Generated by Internal DC/DC Circuit Please contact us for further information.” Is an internal DC/DC circuit used? Can VCC still be supplied up to 15V?

[mikeysklar]

Only use 3v3 or 5v with ADA# 938 a 3v3 regulator is included along with level shifters. Do not supply 15v.

The driver chip, SSD1306 can communicate in two ways: I2C or SPI. The OLED itself requires a 3.3V power supply and 3.3V logic levels for communication, but we include a 3.3V regulator and all pins are fully level shifted so you can use with 3V or 5V devices!

[mikemontauk]

Than you for your input and support, but my question is assuming Pin 28 VCC of the UG-2864KSWLG01 is powered separately. I'm not using the regulators or the level shifts. I would like to know if Pin 28 VCC of the UG-2864KSWLG01 can be up to 15V as the datasheet suggests, or if the DC/DC circuit would interfere. I'm finding the DC/DC circuit a bit clandestine lol. And should Pin 6 VBAT (VDDB) be floating if VCC is powered separately?