Re: [Gumstix-users] ADC input impedance

[Ash C. <ash...@gm...>]

Hi Chris,

I can confirm that there is no additional circuitry on the ADC
lines---they go directly from the PMIC to the board-to-board header.
Note though that ADCIN[3456] are multiplexed signals which will be
tied low when the SEL_MADC_MCPC bit in the CARKIT_ANA_CTRL register is
cleared to 0.

--Ash

On Sun, Dec 29, 2013 at 4:01 PM, Chris Whittenburg
<whi...@gm...> wrote:
>
> Can someone with access to the Overo schematic verify there isn't any
> additional circuitry on the ADC input lines going to the PMIC?  It seems
> like I'm seeing an unexpected loading on ADCIN3 thru 6, and it isn't there
> on ADCIN2 or ADCIN7.  It's almost like a 2K pull-down?
>
> Thanks.
>
>
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