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    bricox

    @bricox

    Embedded software and electronics engineer

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    Location FRANCE

    bricox Follow

    Posts made by bricox

    • RE: M5Paper EPD power consumption

      Hello,
      Here is Shift Register schema, the brend is Nexperia.
      0_1609978353293_046fa671-5c10-4313-ad80-216963318452-image.png
      SYL

      posted in Cores
      B
      bricox
    • RE: M5Paper EPD power consumption

      Hello,
      As I was saying five days ago,
      "I measured USB current with the program "Factory test" and a serial USB device named "UT25".
      The value is 131 mA, without interraction."
      Since then, I have measured the current according to the different programs :
      0_1609964987251_7f2faa65-cde9-482f-afb7-a5bb3f48ebc1-image.png
      The cause of this excess consumption is IT8951.
      An alternative to this component is the 74HC4094D, 8-stage shift-and-store bus register, used as IO extander.
      A competitor with the same display consumes 65 mA, i measured to.
      SYL

      posted in Cores
      B
      bricox
    • RE: M5Paper EPD power consumption

      Hello,
      If you want to measure RTC and zener D11 current, i indicate the PCB resistors positions
      0_1609839826079_87253ca3-b5c9-49a3-a940-755467abbc04-image.png
      SYL

      posted in Cores
      B
      bricox
    • RE: M5Paper EPD power consumption

      Hello,
      On mine, the maxi level indicator of charge is 86% corresponding to 4.18V
      I measured USB current with the program "Factory test" and a serial USB device named "UT25".
      The value is 131 mA, without interraction.
      I also wrote personal comments about all GPIOs (in french, my native language):
      0_1609540042308_d0d7e2f2-2754-4c13-bdb0-eac50a0d8423-image.png
      All GPIOs are represented (except non-existent ones : 20, 24, 28, 29, 30, 31)
      SYL

      posted in Cores
      B
      bricox
    • RE: M5Paper EPD power consumption

      Hello,
      I completed the schema with VUSB_IN, VSYS and OR fonction with D9,D12

      0_1609408092751_1b84713e-842f-4d87-af32-590bbc36dd6f-image.png

      SYL

      posted in Cores
      B
      bricox
    • RE: M5Paper EPD power consumption

      Hello,

      If the repository is facing the wheel,

      0_1609397793398_abc6142e-f0dd-4827-9167-49a0b347486c-image.png

      "code source" is true, "SCH-name" is false

      0_1609397946546_5e5d7b82-4846-499d-8f3b-096794dee6ba-image.png

      SYL

      posted in Cores
      B
      bricox
    • RE: M5Paper EPD power consumption

      Hello,

      i also made a fisrst compact schema to facilitate understanding

      0_1609362387445_6bedbef9-cc33-48d4-96bd-970bd15532db-image.png

      SYL

      posted in Cores
      B
      bricox
    • RE: M5Paper EPD power consumption

      Hello @tatar-andrei,

      With a supply of 4.2V, U(R35)=11mV, equivalent to 1.1µA for RTC and zener D11current.

      Equivalence names table
      0_1609361186835_5027511b-cee9-4100-a03b-8bcdc3b8b6f9-image.png

      There is inversion between Left and Right, why not having simply called the buttons Top and Bottom?

      SYL

      posted in Cores
      B
      bricox
    • RE: M5Paper EPD power consumption

      Hello @tatar-andrei,
      I am also going to use a power supply to continue analyzing the consumption of the various components because IT consumes a lot.
      Can we turn it off with a mos then turn it on again?
      Will it be able to reset itself without the ESP32 sending it an initialization sequence?
      I will study this ...
      SYL

      posted in Cores
      B
      bricox