Lpc2000

Owen Mooney 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.

The LPC2000s are great processors but I think you should look at something
like the MSP430 range for this type of application. The LPCs are fast and
are capable of low-power operation, but it sounds like you need micro-power
operation. 

> 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.

Once again the MSP430s can run straight off a 32KHz rock, and have the
"interrupt on change" thing on all individual pins on ports P1 and P2. In
terms of power consumption the MSP430F149 draws 2.5uA at 4Khz (32K rock) at
2.2V.

I'm saying all this about the MSP430 because I don't understand why you are
considering buying a sports car when you really want a motor-scooter. The
LPC2106 is a great processor but don't go trying to fit a square peg into a
round hole, you'll only frustrate yourself.

BTW, please don't mention that P-I-C word in this group, it's an anathema
and you shouldn't go speaking like that! ;)


- Peter Jakacki