Test points - a possible future direction
wiederling at googlemail.com
Thu Jul 24 13:30:29 CEST 2008
On 7/24/08, Andy Green <andy at openmoko.com> wrote:
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> Somebody in the thread at some point said:
> | On 7/24/08, Thomas Seiler <thseiler at gmail.com> wrote:
> |> You would just need a 2x3 block or so:
> |> VBAT VIO_3v3 (power these cannot pe but on FPC)
> |> GND GND
> |> I2C I2C (these are nice because a single connector for
> |> most basic mods is sufficient)
> | mindreader!
> | Though I think VBAT is a bad idea. and
> | The 3.3V supply should be switchable from the host.
> I think this whole testpoint and connector thing is definitively the
> wrong direction.
> The USB host socket
> ~ - doesn't need you to open the case of Freerunner
> ~ - provides 2.5W power for the external device
> ~ - gives ~1MByte/sec bandwidth in one direction or the other
> ~ - has many standard classes supported in kernel
> ~ - does not need delicate cables
> ~ - allows Y cable so incoming power and charge is possible too
Well, its two different things.
There are lots of _small_ devices that attach to the I2C bus
and would integrate well inside the enclosure. temp sensors
and da/ad converters come to mind.
attaching external usb devices is on an entirely different level.
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