[Arm-netbook] EOMA68 laptop battery management.

Jakub Kákona kaklik at mlab.cz
Thu Mar 3 10:06:05 GMT 2016

What is primary function of STM32F072 MCU? Is in necessary for LCD
Is it STM32F072's firmware already written?
I am pretty sure in fact - I²C should be operated on only one voltage level
~3V3.  But I do not know how the data from battery management I²C bus goes
to the EOMA68 card.

What EDA software are you using? The circuit sheets has very unusual
graphic style. It would be good if we work in common design tool.

I expect two iteration in PCB design. One of local PCB manufacturers offer
prototyping service as 36 EUR per 1dm² of two sided PCB.
Two pcs of planned PCBs probably fits well in to this area. Standard
manufacturing time is 7 days.
Therefore for purpose of time planning I expect the fully functional PCB
design at the end of March or on first week in April.

I do not know the price of shipping costs to you. But I have address in
Prague (Czech Republic)  ZIP code: 18100

I expect the price of shipping will be equivalent to value of connectors or
other passive components, therefore sending it separately won't have much

2016-03-03 0:10 GMT+01:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:

> On Wed, Mar 2, 2016 at 10:49 PM, Jakub Kákona <kaklik at mlab.cz> wrote:
> > Thanks for the diagram!
>  no problem.
> > But I have one more question. Is it really necessarily to operate
> bq24193's
> > I²C bus at 1.8V?
>  i don't know! :)
> > According to datasheet http://www.ti.com/lit/ds/symlink/bq24193.pdf
> > The 1.8V was used only as example of operating voltage..
> > The Absolute Maximum Ratings for all SDA, SCL and INT pins is 7V and both
> > are "i2c standard open collectors" and could be pulled-up to any rail
> within
> > the operating voltage range..
> > Therefore I think the Voltage translator is not necessary...
>   if you reckon an STM32F072 could handle it, then fine.  that saves
> at least 2 ICs, which is great.  if you'd like to actually test it,
> STM32F072-NUCLEO boards are only $EUR 10 from rs-online, mouser, arrow
> and digikey.
>  ok, so key question: what sort of timescale do you think you'd be
> able to do this in?  reason i ask is, i need to work out the timeline.
>  practical matters: i used eurocircuits to get the PCBs done, they
> were about 7-10 days (unless you pay extra), and around $EUR 70 for
> QTY2.  i have some components (connectors, switches, capacitors) i can
> send you.
>  more practical matters: from mid-april i'm going to be moving to a
> new country *every month* until the end of the year, to track getting
> this into a first production run.
>  l.
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