[Arm-netbook] Laptop PCB schematics

[internet at devpi.de]

hey luke,

I just wanted to put my suggestions on rhombus-tech.net but
unfortunately i couldn't figure out how to add a new subpage. to keep
everything tidy and clear this would be really helpful …

i also updated the specification for the pcb connectors, there was
something wrong between pcb3 and pcb1:
sys-v was 4.2v directly from the battery but it is 5v and the first pin
is ground instead of usb_otg_5v0

i will update the other specifications as well as i walk through the
other schematics …

Julius Lehmann

Am 12.02.2017 um 18:58 schrieb Luke Kenneth Casson Leighton:
>
>
> ---
> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>
> On Sun, Feb 12, 2017 at 2:30 PM, Internet <internet at devpi.de
> <mailto:internet at devpi.de>> wrote:
>
>     First look at PCB3 is finished, it is of course possible I am
>     missing something. Anyways, following caught my eyes:
>
>      1. the usb otg charger ic has two capacitors between regn and
>         ground, total value: 11.5uF, datasheet says 1uF. probably no
>         issue though
>      2. 10k thermistor for the otg charger is connected to voltage
>         divider and through another thermistor to bat-v (fuel guage),
>         datasheet says it should be connected to ground (i am not to
>         sure about the guage though, reference application is pretty
>         chaotic and complex)
>      3. status leds should be connected to sys-v (nothing to do if
>         dvcc = sys-v)
>      4. EOMA68-5V0 is not connected to anything, this results in an
>         unpowered card on pcb1 (which is bad); should probably be
>         connected to vcc-5v0)
>      5. level shifter is completely unnecessary because lcd-vcc =
>         vrefttl = 3v3; connect 10k pullup resistors to vrefttl and add
>         pullup for chg_irq to vrefttl
>
> TI bat IC is 1.8v.. wasn't happy with that.
>  
>
>      1. because eoma68-i2c is not used on this pcb remove pullups
>
>
> _great_.  encourages me to take a look and check.
>  
>
>     I hope this helps and if I misunderstood something, please let me
>     know. The fuel guage circuit is more complex than expected, I let
>     you know if there is an issue.
>
>     Do you want me to put all this on rhombus-tech.net
>     <http://rhombus-tech.net>? If so, could you give me some
>     instructions where and how to put it?
>
>
> http://rhombus-tech.net/community_ideas/laptop_15in/pcb2/ then just
> work it out, put whatever you feel is appropriate and i'll review it
> and move / adjust if necessary.
>  
>
>     Additionally, to edit the pages I need some kind of account
>     creation password …
>
>
> ah! sorry, i added that recently after there were attacks on the page
> -- it's "passwordreqd"
>  
>
>     Julius Lehmann
>
>
>     On 11.02.2017 15:00, Luke Kenneth Casson Leighton wrote:
>>
>>
>>     ---
>>     crowd-funded eco-conscious hardware:
>>     https://www.crowdsupply.com/eoma68
>>     <http://t224.mjt.lu/lnk/AEMAHqt4STUAAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYoHFzFqkoe5j4S8W7hrvGQMA-BwAGAjk/1/MkNnISYr4-hglOBjM6YUqw/aHR0cHM6Ly93d3cuY3Jvd2RzdXBwbHkuY29tL2VvbWE2OA>
>>
>>     On Sat, Feb 11, 2017 at 1:33 PM, Internet <internet at devpi.de
>>     <mailto:internet at devpi.de>> wrote:
>>
>>         You are absolutely right. Putting comments separately is the
>>         best thing to do. I just found the edit button on
>>         rhombus-tech.net
>>         <http://t224.mjt.lu/lnk/AEMAHqt4STUAAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYoHFzFqkoe5j4S8W7hrvGQMA-BwAGAjk/2/0gqbLOpYPVPZzmn-W6fIhw/aHR0cDovL3QyMjQubWp0Lmx1L2xuay9BRHNBQUdYeHRoTUFBQUFBQUFBQUFHYkUyd2tBQVNIbEZOVUFBQUFBQUFaSGdBQllueExBV2RocTRJTjNRZWVoRmRQdHN5eHZvd0FHQWprLzEvOXZlenUwMUlMT2hkSExDTENHVTA2QS9hSFIwY0RvdkwzSm9iMjFpZFhNdGRHVmphQzV1WlhR>
>>         ;), this should definitely make things easier ...
>>
>>
>>      yay, magic.   also stops duplication and AOL-style me-too
>>     postings.  if anyone remembers the AOL bbs...
>>
>>     l.
>>
>>
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>>     <http://t224.mjt.lu/lnk/AEMAHqt4STUAAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYoHFzFqkoe5j4S8W7hrvGQMA-BwAGAjk/3/QzsVz1TKCdXr54efyTuzyg/aHR0cDovL2xpc3RzLnBoY29tcC5jby51ay9tYWlsbWFuL2xpc3RpbmZvL2FybS1uZXRib29r>
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