Hello,
Here is Shift Register schema, the brend is Nexperia.
SYL
bricox
@bricox
Embedded software and electronics engineer
Posts made by bricox
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RE: M5Paper EPD power consumption
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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 :
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 -
RE: M5Paper EPD power consumption
Hello,
If you want to measure RTC and zener D11 current, i indicate the PCB resistors positions
SYL -
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):
All GPIOs are represented (except non-existent ones : 20, 24, 28, 29, 30, 31)
SYL -
RE: M5Paper EPD power consumption
Hello,
I completed the schema with VUSB_IN, VSYS and OR fonction with D9,D12SYL
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RE: M5Paper EPD power consumption
Hello,
If the repository is facing the wheel,
"code source" is true, "SCH-name" is false
SYL
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RE: M5Paper EPD power consumption
Hello,
i also made a fisrst compact schema to facilitate understanding
SYL
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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
There is inversion between Left and Right, why not having simply called the buttons Top and Bottom?
SYL
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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