Re: [Gumstix-users] Simple custom board design question

[Dave H. <dhy...@gm...>]

Hi Dave,

> We're going to be creating a custom pcb to mount our gumstix along with a
> couple of sensors which are just hanging off our STUART board with loose
> wires for testing atm.  Most of the STUART board is surplus to requiremen=
ts
> for the final design and I was wondering if anyone could confirm whether =
any
> of the components on the STUART board are required for what we need:
>
> - Power (coming from a 5V regulated source)
> - Pin 18 (20 pin GPIO layout) used for a PWM signal
> - I2C (SDA/SCL - Pins 1 & 3 on 20 pin GPIO layout)
>
> Or can we just simply use the STUART brd file as a guide and layout just
> these pins from the hirose connector?

Pretty much.

The components on the STUART board are for a couple of purposes:
1 - USB support
2 - Serial port support.
3 - Voltage regulator to provide 3.3v for 1 & 2.

If you don't need serial or USB, then none of the circuitry on the
STUART board is required (except for the pullup resistor on the FFUART
RxD line).

--=20
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/