Lpc2000

----- Original Message ----- 
From: "Lasse Madsen" <lm@...>
To: <lpc2100@yahoogroups.com>
Sent: Thursday, December 18, 2003 8:41 AM
Subject: [lpc2100] Hi all.


> Hi everyone.
>
> I'm so pleased to find the LPC user group here on yahoo as i've been
looking
> for info about the LPC2106 for quite some time.
>
> Allow me to introduce my self.
>
> My name is Lasse Madsen im an electronics engineering apr. from Aalborg,
> Denmark.
> Im daily involved with Atmel AVR software development in C / Asm. I
decided
> to try the LPC series on an excisting AVR design to see if there where
major
> differences regarding speeds etc.
>
> I have the ARM Embedded Toolkit compiler as I've been using Samsung's
B0X44
> multimedia ARM processors I guess it should also work with the LPC ?
>
> Are there any tools availble for calculating timers, uarts etc. ?
>
> I know its much to ask, but if I ask very polite can I pursuade anyone to
> take a brief look at my schematic to see if i've forgotton or was unaware
of
> any twinkles about the LPC connections !?

Welcome to the group, Lasse.

Philips recommends larger capacitors on the crystal (they have a table in
the user manual): 68 pF for 10 MHz. I couldn't find them in 0805 so I use 56
pF. They don't mention a resistor across the crystal.

I'd include the JTAG connector, it'll make debugging much easier. You'll
need a Wiggler or equivalent, of course.

Fixed voltage regulators (1.8 V ones are difficult to find), will simplify
the circuit a lot.

I'd use a MAX202 (100n capacitors) or a MAX3232 (3.3V) for the RS-232. You
won't need the pullups for the latter, of course.

The LCD should work off 3.3V (the Powertip ones I use do), although you
might need a -ve supply to get the contrast control to work properly.

That's all I can think of.

Check your '2106 connections against my (much simpler) schematic, I know
mine works. 8-)

Leon
--
Leon Heller, G1HSM
Email: aqzf13@...
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html