Lpc2000

Nick,

I get 0V on the TX pin at 9V.
It is clear from the schematic that the board won't work at 9V. I 
was also a bit afraid of upping the voltage as the current increased 
a lot. The trick is to start at 12V since the regulators draw very 
much current when fed below nominal voltage. After the rectifying 
bridge there is 7805(and the schematic says 12V there!). There is 
also a 1N4733 5V zener-diode. Thus, att 9V there's only 4V left for 
the LM1117 3.3V regulator which has a minimum voltage drop of about 
1.0-1.2V minimum (4.3-4.5V in). The core may get the correct voltage 
but the peripherals won't. 

Cheers
/Anders





--- In lpc2000@yahoogroups.com, "nma550n" <nma550n@...> wrote:
>
> Anders,
> 
> Great to hear you got your board working! I have not tried upping 
the 
> voltage as yet, will give it a try later. The only thing that 
stopped 
> me thinking that the voltage would make any differenct was that 
the 
> board was getting 1.8v for the core and 3.3v for the peripherals. 
> 
> Are you saying it requires 12v for RS232?
> 
> Also, what is voltage on your Tx pin on the LPC2106 (at default)?
> Regards,
> 
> Nick
> 
> 
> --- In lpc2000@yahoogroups.com, "kjellberg_anders" <akj@> wrote:
> >
> > 
> > Nick,
> > 
> > It actually works now! Olimex states 9VDC/6VAC for powering the 
> > board, but when I had a look at the closer look at the schematic 
it 
> > became obvious that it should be 12V... Let me know if this 
solves 
> > your problem as well. Otherwise I could post my LPC utility 
> settings.
> > 
> > regards
> > /Anders
> > 
> > 
> > 
> > 
> > --- In lpc2000@yahoogroups.com, "nma550n" <nma550n@> wrote:
> > >
> > > Anders,
> > > 
> > > You had any luck yet?
> > > 
> > > Cheers,
> > > 
> > > Nick
> > > 
> > > --- In lpc2000@yahoogroups.com, "kjellberg_anders" <akj@> 
wrote:
> > > >
> > > > 
> > > > Nick,
> > > > 
> > > > Thanks for letting me know about your LPC 2106 problems. 
Since 
> > I'm 
> > > > working from home today I do not have any other cables but 
I'll 
> > get 
> > > > back to you as soon as I have tried a different one. As I 
wrote 
> > > > earlier, I have tested different baudrates and made sure 
that 
> > the 
> > > > comport was correctly setup. I'll check that with a scope 
> > tomorrow. 
> > > > 
> > > > Best regards 
> > > > /Anders
> > > > 
> > > > 
> > > > -- In lpc2000@yahoogroups.com, "nma550n" <nma550n@> wrote:
> > > > >
> > > > > Anders,
> > > > > 
> > > > > I am also having problems with the Philips LPC2000 flash 
> > utility 
> > > > > (olimex LPC2106), and was just about to post a message on 
> this 
> > > > board 
> > > > > to see if the problem lies with my development board.
> > > > > I am just trying to upload the simple blink LED hex file 
to 
> > > flash, 
> > > > > and it just comes up with cannot communicate. I too have 
> tried 
> > > > many 
> > > > > different com ports, jumper settings and different reset 
> > > > conditions, 
> > > > > to no avail. This is the first time I have tried to use 
this 
> > > > board, 
> > > > > so i have no idea if the thing works.
> > > > > 
> > > > > I am almost certain the problem does not lie with the 
Philips 
> > > > LPC2000 
> > > > > flash utility as I have scoped out the Rx signal (3.3v 
low, 
> 0v 
> > > > high) 
> > > > > on the board and found it to receive data. 
> > > > > However, my Tx pin on the chip is always at ground and 
does 
> > > > nothing.
> > > > > 
> > > > > Does anyone know if Tx should be held at 0v???
> > > > > 
> > > > > Not sure if this will help you Anders, but just to let you 
> > know 
> > > > your 
> > > > > not alone.
> > > > > 
> > > > > cheers,
> > > > > 
> > > > > Nick
> > > > > 
> > > > > > --- In lpc2000@yahoogroups.com, "Anders Kjellberg" 
<akj@> 
> > wrote:
> > > > > > >
> > > > > > > Hi,
> > > > > > > I'm trying to establish connection with Philips Flash 
> > Utility 
> > > > and 
> > > > > > an Olimex 2106 mt board without success. TheBSL jumper 
is 
> > > > shorted 
> > > > > > and the frequency set at 14745kHz (14.7456MHz). 
Different 
> > > > baudrates 
> > > > > > have been tried without success. I am not sure about the 
> > > DTR/RTS 
> > > > > > settings however. Also I may be using the wrong RS232 
> cable. 
> > > > Null 
> > > > > > modem or not? I'll have to check that. I intend to use 
the 
> > > > > > bootloader and ICCARM. Any ideas that may help?
> > > > > > > 
> > > > > > > Thanks in advance!
> > > > > > > /Anders
> > > > > > > 
> > > > > > > [Non-text portions of this message have been removed]
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>