----- Original Message ----- 
From: "Xiaofan Chen" <xiaofanc@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Wednesday, June 14, 2006 4:16 PM
Subject: Re: [EE] Power to peripherals


> On 6/15/06, John Pearson <xero@cmc.net> wrote:
> > One advantage of I/O pin power is I can turn them off when not needed,
> > or if not getting correct info from them, saving battery power.
>
> You can power the DS1821 with an LDO with shutdown pin and
> control the LDO shutdown pin with an I/O port.
>
> > What power scheme would be the less likely to cause noise within the
processor, I/O power or supply power?
>
> I think to use supply power might be better. However, it all depends on
> your setup. What is the analog reference voltage? Is it from a voltage
> reference or from filtered Vdd?

Filtered Vdd.

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