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Lpc2000

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Message

Re: 2 queries, counter & battery back up

2004-03-02 by lpc2100_fan

Owen,

the LPC2000 is a 32-bit family the PIC16xx is a 14-bit  ;-))  family.
Very different animals. Actually the PIC is nothing but an 8-bit micro
with a weird CPU as you already pointed out. If you want to look at
Philips, lowest power, similar I/O functions, similar processing power
:-|  you have to look at the LPC900 family, e.g. the LPC935 could be
very close to what you need. 
http://www.semiconductors.philips.com/pip/P89LPC935FDH.html
Unfortunately the max flash size is only 8k but it has a RTC-timer
(just a long timer, no time of day function) and if clocked with 32
kHz external the power consumption should be close to the 10 uA you
mentioned from the MAX part. You can switch to the internal 7.37..MHz
oscillator on the fly and get "ok" performance for the time you need.

May be this helps.

For lowest power consumption the MSP430 offers interesting features!

Cheers Bob

--- In lpc2000@yahoogroups.com, Owen Mooney <ojm@s...> wrote:
> I am about to embark on my first LPC2106 project. I chose this product 
> for its small size and cost for a single chip solution for a data
logger.
> 
> I also need counters + RTC; I also need a low power consumption. I want 
> 10 years operation from a single lithium cell.
> 
> The intention is to feed the pulse inputs into D Flip flops (to catch 
> them) and then feed them into interrupt inputs. The RTC will be handled
> by an external component (probably a maxim chip) in the same way. I 
> intend to keep the product in power down mode most of the time
> (10 microamps I believe).  I would be interested in anyones comments on 
> this use of the processor.
> 
> I was interested in Phiips comments about a new development with these 
> components. Unfortunately I can't wait. If they are prepared to accept 
> comments from us, then they could look at the PIC16F877 / PIC16F452. It 
> has a rubbish processing core, but a great I/O system. I love the 
> "interrupt on change" inputs. I have had these components, together
with 
> a whole board, operating at 25 microamps using the on board 32KHz 
> oscillator. The  main clock wakes up every RTC interrupt (every second) 
> and whenever an external event happens.I get full processing capablity 
> with negligible power consumption. Pity about the processing core and 
> it's innumerable silicon bugs, else I would be still using this series.
> 
> Owen Mooney

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