Re: [Balloon] Balloon board IO voltages

All exposed logic level signals are 3v3.
and yes it comes from the PXA PSU.
There should be reasonable current capacity (100mA or so)
Its also possible to use VDD_EXT via J9 and switch this to VDD_SPARTAN_IO with J5.
Depending on whats in the FPGA this can give more current.
Alternatively you can tap into VDD_RAW on J13 and regulate down from what ever is incoming, typically 5v.


Regards

David


On 25 May 2011, at 14:31, Patrick Doyle wrote:

> What are the specifications for the I/O voltages on the Balloon board,
> specifically on the SAMOSA connector?
>
> Looking at the schematic, I see VDD_SAMOSA is sprinkled across J6 & J7
> and that it is attached to VCC_IO through a switch. I suppose it's
> possible that the supply is dynamically configurable from U5 (a
> MAX_1586B). I'd have to go look at the data sheet, but I'm really
> more concerned about the IO voltages on that connector. Are the 3.3V
> or 1.8V?
>
> For now, I'm going to assume 3.3V, but I hate that word ("assume").
>
> --wpd
>
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