<![CDATA[Circuit Diagram: TTGO ESP8266 0.91 Inch OLED]]>Good day everyone,

Does anyone know where to get a circuit diagram for the TTGO ESP8266 0.91 Inch OLED?

I am getting very high sleep current of 6mA in deep sleep.

If I run the same code on a wemos D1 Mini, with 0.91 Oled, then I get 0.15mA sleep current.

Only way to find the problem is with the circuit diagram...

Thank you,
Errol

]]>https://www.community.lilygo.cc/topic/9/circuit-diagram-ttgo-esp8266-0-91-inch-oledRSS for NodeThu, 16 Jul 2026 05:08:32 GMTTue, 21 Sep 2021 15:28:18 GMT60<![CDATA[Reply to Circuit Diagram: TTGO ESP8266 0.91 Inch OLED on Mon, 06 Dec 2021 02:13:47 GMT]]>@errolt
https://github.com/LilyGO/TTGO-ESP8266-0.91-SSD1306/blob/master/t12_8266_v1.3.pdf
The schematic is here

]]>https://www.community.lilygo.cc/post/54https://www.community.lilygo.cc/post/54Mon, 06 Dec 2021 02:13:47 GMT<![CDATA[Reply to Circuit Diagram: TTGO ESP8266 0.91 Inch OLED on Wed, 22 Sep 2021 15:39:10 GMT]]>And reset of USB chip is pulled to 5V, chip only allows 3.8V. I think this damaged the chip because even removing that pullup it still uses 6mA.

]]>https://www.community.lilygo.cc/post/19https://www.community.lilygo.cc/post/19Wed, 22 Sep 2021 15:39:10 GMT<![CDATA[Reply to Circuit Diagram: TTGO ESP8266 0.91 Inch OLED on Wed, 22 Sep 2021 13:12:57 GMT]]>Confirmed!

Bad design. USB chip is powered by battery? Even when no USB cable is plugged in? And the USB chip does not enter sleep, so draws 6mA from battery.

Removing USB chip drops sleep current down to the expected 0.08mA

I still need the circuit diagram to fix the circuit so I can put the USB chip back on the PCB.

]]>https://www.community.lilygo.cc/post/18https://www.community.lilygo.cc/post/18Wed, 22 Sep 2021 13:12:57 GMT