Current consumption in hybernate mode

[nitescuc]

Hello, I'm using a 2.13" BW module with a ESP32, Arduino Framework and pretty much followed the example provided with GxEPD2 lib. I have the expected result except that I call display.hibernate() and I measure a 500uA power consumption where I would expect much less from the module. Does this number seem normal? What is the expected current in power off mode? And in power on? I don't seem to find the electrical caracteristics in the documents in this repo. Thanks

[ilarth]

I am getting the same results with the 2.9" module. With reset pin pulled low it uses 500uA. Without pulling it low it's 900uA.

The controller datasheet shows 3 sleep modes. It says 35uA max.

I tried bypassing the linear regulator by supplying 3.3v after it. It made no difference.

[nitescuc]

So, for a low power application it could make sense to power the module from the ESP32 itself using a GPIO pin I suppose?

[ilarth]

There is about 100uA and 125uA on CLK and MOSI pins respectively in deep sleep. I am using an ESP32.

I have a BME280 on the same SPI bus. It goes into deep sleep properly. I think there's something wrong with the design of these boards?

Edit: Yeah some thing is wrong with these modules. I swapped it with an MH-ET Live 2.9" board. It uses 40uA in deep sleep. Everything else is the same. Same test bench. Same code, except for changing the display class.

[WeActStudio]

This is the result of our test, using the EpaperModuleTest_AT32F403A routine

1. Sleep Mode1,VCC=5V,IO=3.3V, sleep current is 6uA
2. Sleep Mode1,VCC=3.3V,IO=3.3V, sleep current is 55uA
   

MH-ET Live 2.9 "has a buffer to reduce pin leakage current, but we don't have one

[nitescuc]

Thanks, I now get the same result of roughly 55uA using this initialization command:
display.init(115200,true,2,true);
instead of
display.init(115200,true,50,false);
with ESP32, Arduino Framework, GxEPD2 lib. The ePaper's module pins are connected to ESP32 without any other component to pull-up or pull-down, etc.
I guess you might want to update your sample code ?