LPC 2106 - RTC Battery backup

Started by Pramod Wani September 12, 2006
Dear Sir ,

I want to develop rtc circuit with battery backup in lpc2106.

I have not used any external components for rtc circuit.

But for battery backup , should I connect coin cell supply to the Vdd1.8 (
core ) pin of LPC2106 ?

Or Should I connect coin cell supply to vdd3-1 & vdd3-2 pin of LPC2106 ?

Depending on that I have to decide the coin cell voltage rating and part
no.?

Or any one can suggest me , which coin cell will be better for the same ?

Expecting the reply.

Thanks and Best Regards

Pramod

An Engineer's Guide to the LPC2100 Series

Pramod Wani wrote:
>
> Dear Sir ,
>
> I want to develop rtc circuit with battery backup in lpc2106.
>
> I have not used any external components for rtc circuit.
>
> But for battery backup , should I connect coin cell supply to the
> Vdd1.8 (
> core ) pin of LPC2106 ?
>
> Or Should I connect coin cell supply to vdd3-1 & vdd3-2 pin of LPC2106 ?
>
> Depending on that I have to decide the coin cell voltage rating and part
> no.?
>
> Or any one can suggest me , which coin cell will be better for the same ?
>
There are a lot of evaluation LPC2000 boards for sale out there on the
net, most of them have schematics. I suggest that you start with google
and begin looking at them.

TomW

--
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net http://cyberiansoftware.com http://openzipit.org
"Windows? No thanks, I have work to do..."
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