[Arm-netbook] Laptop PCB schematics

[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

On Sat, Feb 18, 2017 at 4:26 PM, <internet at devpi.de> wrote:

> 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 …
>
just add text leave it to me i'll git pull what you add then use a text
editor it's a lot easier.

> 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
>

 yep i know.  i'm adding a 5v boost converter to PCB3.


> 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
> <http://t224.mjt.lu/lnk/AEEAIEm6x_IAAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYqHXBu7svXnqrQGqioHzcKxJUzQAGAjk/1/GJuXJr4EE30kGpseDsELXw/aHR0cHM6Ly93d3cuY3Jvd2RzdXBwbHkuY29tL2VvbWE2OA>
>
> On Sun, Feb 12, 2017 at 2:30 PM, Internet <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://t224.mjt.lu/lnk/AEEAIEm6x_IAAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYqHXBu7svXnqrQGqioHzcKxJUzQAGAjk/2/E35lvbkG1Dh_Uib7FsHh1A/aHR0cDovL3Job21idXMtdGVjaC5uZXQ>?
>> If so, could you give me some instructions where and how to put it?
>>
>
> http://rhombus-tech.net/community_ideas/laptop_15in/pcb2/
> <http://t224.mjt.lu/lnk/AEEAIEm6x_IAAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYqHXBu7svXnqrQGqioHzcKxJUzQAGAjk/3/x5FUHfaypHPNrYKA7pqXjw/aHR0cDovL3Job21idXMtdGVjaC5uZXQvY29tbXVuaXR5X2lkZWFzL2xhcHRvcF8xNWluL3BjYjIv>
> 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/AEEAIEm6x_IAAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYqHXBu7svXnqrQGqioHzcKxJUzQAGAjk/4/PLIU9yiiO54fWbRpE3PiMA/aHR0cDovL3QyMjQubWp0Lmx1L2xuay9BRU1BSHF0NFNUVUFBQUFBQUFBQUFHYkUyd2tBQVNIbEZOVUFBQUFBQUFaSGdBQllvSEZ6RnFrb2U1ajRTOFc3aHJ2R1FNQS1Cd0FHQWprLzEvTWtObklTWXI0LWhnbE9Cak02WVVxdy9hSFIwY0hNNkx5OTNkM2N1WTNKdmQyUnpkWEJ3YkhrdVkyOXRMMlZ2YldFMk9B>
>>
>> On Sat, Feb 11, 2017 at 1:33 PM, Internet <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/AEEAIEm6x_IAAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYqHXBu7svXnqrQGqioHzcKxJUzQAGAjk/5/jLEjSL9RIxsci-UG9kLing/aHR0cDovL3QyMjQubWp0Lmx1L2xuay9BRU1BSHF0NFNUVUFBQUFBQUFBQUFHYkUyd2tBQVNIbEZOVUFBQUFBQUFaSGdBQllvSEZ6RnFrb2U1ajRTOFc3aHJ2R1FNQS1Cd0FHQWprLzIvMGdxYkxPcFlQVlBaem1uLVc2Zklody9hSFIwY0RvdkwzUXlNalF1YldwMExteDFMMnh1YXk5QlJITkJRVWRZZUhSb1RVRkJRVUZCUVVGQlFVRkhZa1V5ZDJ0QlFWTkliRVpPVlVGQlFVRkJRVUZhU0dkQlFsbHVlRXhCVjJSb2NUUkpUak5SWldWb1JtUlFkSE41ZUhadmQwRkhRV3ByTHpFdk9YWmxlblV3TVVsTVQyaGtTRXhEVEVOSFZUQTJRUzloU0ZJd1kwUnZka3d6U205aU1qRnBaRmhOZEdSSFZtcGhRelYxV2xoUg>
>>> ;), 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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