[Arm-netbook] Keyboard

[Raphaël Mélotte]

Ok, I understand it a bit better now. Thank you :-)

I'm starting to realize I have been using laptops for years and I know
nothing about how they works.


2016-08-29 21:52 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:

> ---
> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>
>
> On Mon, Aug 29, 2016 at 8:15 PM, Raphaël Mélotte
> <raphael.melotte at gmail.com> wrote:
> > Of course ! I forgot the touchpad actually had an lcd. It will be so
> great
> > to be able to have some of those displayed right below the keyboard ! :-)
> > I just saw the power button that's connected to the STM32F072 when
> looking
> > for something else.
> > If I got it right, PCB1 receives the CPU card and powers PCB2
>
>  nope.  PCB3 powers PCB2, which (through the STM32F) controls the
> Battery / Power IC on PCB3, through which power to PCB1 is controlled.
>
>  yes it literally has to be that complex because EOMA68 power is
> "OTG-like" i.e. may be *TWO-WAY*.  so the STM32F072 is responsible for
> monitoring (through I2C in communication with the Battery / Power IC)
> what is going on, also receives notification about power provision
> from the EOMA68 Computer Card, and makes decisions whether to put the
> Power IC into "OTG Host" or "OTG Client" power modes.
>
>  look up the datasheet on the bq24193 for details.
>
> > which contains
> > the STM32F072. Does that mean that a CPU card have to be plugged in in
> order
> > for the STM32F072 to be powered ?
>
>  incorrect.  the STM32F072 is powered continuously  it can never be
> powered off (short of opening up the laptop case and physically
> disconnecting the battery).
>
>  l.
>
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