On 19/01/17 17:03, Rob Herring wrote: >>> According to the datasheet, SSD1307 has 2 supplies: Vdd and Vcc >>> >>> I don't see any mention of a charge pump, so that must be an external >>> component. >> >> VBAT is for SSD1306. Perhaps the DT doc should mention it. > > Datasheet says VBAT is reserved, connect to Vdd. I would just describe > Vdd and Vcc in that case. I'm no HW guy, but as far as I understand, you can wire it up two ways. One has VBAT connected to VDD. The other one has VBAT connected to external supply. See "Figure 1 : Application Example of SSD1306Z with charge bump". Tomi
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