Re: [PATCH v2 4/5] fbdev/ssd1307fb: add support to enable VBAT

On 19/01/17 17:03, Rob Herring wrote:

quoted

quoted

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