Hi David & Carlos,
According to your V2 bom:
http://downloads.qi-hardware.com/hardware/sakc/bom/rc2/sakc_V2_BOM_carlos_0723.ods
I transferred into wiki page and mapped with current some parts from Sharism inventory. So a rough V2 Bom cost is here now:
http://en.qi-hardware.com/wiki/SAKC_RC2_BOM
They p/n or price will undergo changes even before the PCB prototypes are fabricated.
It's still without USB cable & box.
Here's my comments:
a) Are you really need a 64MB 512Mb SDRAM? Why not 32MB same as BEN? Surely we know the bigger the better. Pls see its cost carefully.
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.
2, C15, 10nF on schematic, you want it 100nF or 10nF?
3, R2, 2.5k/1% on sch.; actually it will be mounted a 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 if later having V3.
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 , 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.
6. J6/J7/J18: those three actually can combine into one part MD241845 as listed.
7. D8/D9: CDBU0130L this Schottky Barrier Diode 100mA 35V, if you don't insist, pls ref. to use MSCD104H same as AVT2 & BEN.
8. 10V, 10uF, 10%: I use TANTALUM capacitor (our inventory) instead of MLCC.
9. L13: I'll temporarily use PI0302-4R7M if I don't have it before smt.
10. R34: once you finish test charge function, pls tell me the value.
c) Layout:
1. J20: LCM FPC connector, As same Wolfgang questioned its orientation previous reply.
2, L12: let it not close to U11 body.
3, J19: mark "J19" reference on silkscreen.
All above can be as next change reference. Pls let me know your thinking on above items.
Thanks,
Adam