On Fri, 17 Nov 2006 14:12:13 +0000, you wrote:

>In my circuit I need a couple of open drain outputs (for varying the
>resistance to ground of a certain point by connecting resistors). However
>the PIC I'm using (12f675) has no open drain outputs, so I was wondering
>whether it would be possible to simulate this by switching the pin between a
>high impedance input and a low output? Are there any flaws I've missed in
>this idea? (yes I could use external FETs, but given the reasons for using
>an 8-pin PIC, I'm also trying to keep component count down).

Yes - this will work fine, the only proviso being that the pin can't swing above Vdd

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