[Gta04-owner] Welcome

Angus Ainslie angus at akkea.ca
Fri Oct 21 16:44:24 CEST 2011


Hi Nikolaus,

I see a number of people have their GTA04 devices already.

I was hoping you could send me a tracking number for my device so I can
check it's progress.

Thanks
Angus

On Fri, January 21, 2011 2:57 am, Dr. H. Nikolaus Schaller wrote:
> Hi all,
> welcome to this new list where we want to give all Early Adopters a forum
> to
> exchange ideas, requests, status, questions etc. with the developing
> team.
>
> Christoph, David, myself and others from the core development team will
> try to
> answer your questions.
>
>
> 1. Component Sourcing
>
> We have ordered the first GTM601W modules and 25 units will arrive
> in approx. 10 days. So UMTS is secured.
>
> For the OMAP processors it is not difficult to get them. Either DigiKey,
> Mouser, EBV/Avnet have them in stock.
>
> A minor issue is finding the best price. There are different options:
> * OMAP3503DCBB (w/o DSM and Graphics engine) is the cheapest
> * OMAP3530DCBB (600 MHz variant)
> * OMAP3530DCBB72 (720 MHz variant)
> * DM3730CBB800
> * DM3730CBB1000 (1GHz)
>
> They are are drop-in replacements and there is only one very small
> difference between OMAP35xx and DM3730 (replace a R with a C).
>
> The price is not exactly clear. From my research it appears that
> the DM3730 is cheaper than the OMAP3530DCBB72 - i.e. more
> MIPS/€. But this has to be verified before we order.
>
> A major issue is sourcing of the PoP Memory chips. We need quite
> special devices since they must match the OMAP processor.
> Micron is the main supplier and has two different types:
>
> a) MT29C - combined LPDDR/NAND flash
> b) MT46H - LPDDR only
>
> If you want to help us with search please check for a VFBGA168
> package (there are many different packages available).
>
> We have identified these variants (price is from EBV home page for
> 1000 units):
>
> 128 MB RAM	256 MB Flash	?
> 256 MB RAM	512 MB Flash	?
> 512 MB RAM	512 MB Flash	?
> 128 MB RAM	0 Flash			13 EUR
> 256 MB RAM	0 Flash			23-37 EUR (there are different temperature ranges)
> 512 MB RAM	0 Flash			58 EUR
> 1024 MB RAM	0 Flash			126 EUR
>
> for comparison what other projects use:
> * GTA04A2 samples	256 MB RAM	256 MB Flash	(~30€ but no longer available)
> * Beagleboard		256 MB RAM	256 MB Flash
> * BB-XM				512 MB RAM	0 Flash
> * Pandaboard		1GB RAM		0 Flash			(I have no idea how they can sell them at
> 179 USD without loosing much money)
> * OpenPandora		256 MB RAM	256 MB Flash
>
> The problem we have to solve is that we have not yet got a quotation
> for the MC29C chips and nobody has them in stock. And they appear
> to be available only in Asia or the US. I am working with AVNET
> Europe since weeks to get through this. It is like wading through syrup...
>
> The supply situation for the MT46H is better - but then we won't have
> built in NAND flash which is good for permanently storing X-Loader,
> U-Boot and the U-Boot environment.
>
> From our experiences 256 MB RAM is good enough (BeagleBoard) but
> 512 MB would be better. 1GB is still too expensive.
>
> So if you have experience to share or find other compatible solutions
> or suppliers, please let us know.
>
> All other components are quite easily available through DigiKey or
> other sources, so we order them with low lead time.
>
>
> 2. PCB layout
>
> We are working heavily on updating the PCB layout from the GTA04A2
> samples towards the GTA04A3 version. This means fixing some nasty
> bugs. We did have bugs in the component library which is a situation that
> no integrated Design Rules Check can reveal. But we know from the
> GTA04A2 samlpes what the most critical bugs are and let's hope that
> we don't introduce new ones :)
>
> Major changes from A2 -> A3 are:
> * replace GTM501 by GTM601 incl. some driver logic (=> better UMTS
> performance,
>    cheaper, 1.8V logic compatibility, better availability since GTM501
> will go out
>    of production)
> * replace LDM303DLH (Accelerometer+Compass) by HMC5883L + BMA180
>    (LSM303 is not available, BMA180 has best ADC resolution we know of)
> * redesign step-down converters for TPS65950 (we have problems during
>    power on and with higher battery levels - the system does a spurious
>    self-reset with voltage > 3.5 V and it appears that there is quite a
> bad
>    power conversion rate)
> * fix some crossed over lines (I2C1, serial I/F for Bluetooth,
> reassignment of
>    some GPIOs to better match power-on states)
> * adding two 60 pin B2B connector headers to allow to connect different
>   displays and peripherals
> * AC charger power input added to RS232 connector (6 -> 8 pins)
>
> I think we will need approx. 2 weeks to finalize this. And then,
> production
> of the PCB needs approx. 4 weeks.
>
> Our SMD production company is currently getting a new and bigger
> pick&place machine so that they have the capacity to produce hundreds
> of GTA04 units.
>
>
> 3. Which information expected in the Wiki?
>
> I have set up a new wiki page:
>
> 	wiki.gta04.org
>
> which is thought to communicate the best information materials you need.
> To structure this in advance, please add your wishes to the requested
> pages
> list:
>
> 	http://projects.goldelico.com/p/gta04-main/page/RequestedPages/
>
>
> 4. Draft of the User Manual
>
> We are also writing a user manual and please find attached an (early,
> incomplete and sometimes wrong) draft.
>
>
> So if you have ideas, suggestions, questions, please use this list for
> exchange.
>
>
> BR and happy high-power-Freerunning :)
>
> Nikolaus
>
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> Gta04-owner at goldelico.com
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>


Angus Ainslie
403-918-4519



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