SACK V2 test

Adam Wang adam at sharism.cc
Tue Jul 27 21:28:29 EDT 2010


Hi,


> It doesn't matter  32MB is good, we can provide both option if the customer
want more RAM, but for this first run 32MB is fine.

Ok, first 32MB.


>> b) Parts:
>>   1, D10, from http://en.qi-hardware.com/w/images/b/bf/SAKC.jpg, seems
>> you removed the diode on the led drive board I sent to you then soldered on
>> V2 board. You can check and try to use MSCD104H used on BEN or AVT2. I
>> filled it in "Substitution P/N" column.Check it if it can meet your
>> footprint.
>>
>
> I've already change D10 footprint to fit QI's inventory
>
>
Great!


>
>>   2, C15, 10nF on schematic, you want it 100nF or 10nF?
>>
>
> C15 value came from reference design, If you want to change it no problem.
>
>
Then I keep 10nF.


>
>
>
>>   3, R2, 2.5k/1% on sch.; actually it will be mounted a 2.49k/1%.
>>
>
> The right value is 2.5k but I don't have this value I've mounted a near
> value.
>
>
So I'll use 2.49k/1%.


>
>
>>   4, Y3, it's FXO-HC536R-50 (5.15mm * 3.35mm) on bom, but should use
>> FXO-HC736R-50 (7.5mm * 5.2mm) to meet your footprint. I suggest that we can
>> use smaller one: SO5032-050000-O3A-BBE-QA  which is used on Milkymist One
>> even later Xue.
>> http://downloads.qi-hardware.com/hardware/sakc/datasheet/Y3~SO5032-050000-O3A-BBE-QA~NOT_FINAL.pdf<http://downloads.qi-hardware.com/hardware/sakc/datasheet/Y3%7ESO5032-050000-O3A-BBE-QA%7ENOT_FINAL.pdf>if later having V3.
>>
>
>
> If the footprint and the frequency (50MHz)  is the same you can change it,
> no problem, I can't access download server thsi week, so I can't check the
> oscillator size.
>
>
This V2 I'll just use 7.5mm * 5.2mm, later version pls change to a smaller
5.15 * 3.35mm.


>
>
>>   5, C69, C71: according to
>> http://downloads.qi-hardware.com/hardware/qi_avt2/v1.0/datasheet/LCM~GPM940B0-SPEC_A_2009.01.13~~FINAL_LCM-NOT_ON_SOME_PROTOTYPES~~.pdf<http://downloads.qi-hardware.com/hardware/qi_avt2/v1.0/datasheet/LCM%7EGPM940B0-SPEC_A_2009.01.13%7E%7EFINAL_LCM-NOT_ON_SOME_PROTOTYPES%7E%7E.pdf>, those two are suggested to be 4.7uF/25V, but they are all changed to
>> 4.7uF/16V. You can easily check those body color are likely different on
>> BEN's led driver board compared to others capacitors. I'll directly change
>> them later.
>>
>
> I'm recycling all LCD's circuit for black LCM sent by you, if you want to
> make any change here no problem.
>
>
Sure, I directly change it to 4.7uF/25V.


>
>
>>   6. J6/J7/J18: those three actually can combine into one part MD241845<http://www.stm.com.tw/test/pdf-1/c24184.pdf>as listed.
>>
>
>
>
>
>>   7. D8/D9: CDBU0130L<http://www.comchip.com.tw/cms/UserFiles/QW-A1107-CDBU0130L-RevA134692.pdf>this Schottky Barrier Diode 100mA 35V, if you don't insist, pls ref. to use
>> MSCD104H same as AVT2 & BEN.
>>
>
> No problem
>
>
ok.


>
>
>>   8. 10V, 10uF, 10%: I use TANTALUM capacitor (our inventory) instead of
>> MLCC.
>>
>
> No problem
>

ok.


>
>
>
>>   9. L13: I'll temporarily use PI0302-4R7M if I don't have it before smt.
>>
>
> I'll change the footprint to fit the PI0302-4R7M.
>
>
So V2'll use this firstly.


>
>
>>   10. R34: once you finish test charge function, pls tell me the value.
>>
>
> Right now I don't have batteries, my students will make this test :)
>

Before smt, I'll ask again. I can empty that part firstly even once smt
start.


>
>
>>
>> c) Layout:
>>    1. J20: LCM FPC connector, As same Wolfgang questioned its orientation
>> previous reply.
>>
>
> The current orientation is good don't change.
>

V2 will surely be the same. Pls take good structure stacking design on V3,
we can discuss
more here.
Thanks,
Adam
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