Lpc2000

Nick,

I did not expect anything like this either...
I had a look at the P2106 schematics and apparently it is similar to 
the mt board in this respect. The same 5V zenerdiode followed by a 
3.3V regulator. This regulator feeds the RS232 chip, no RS232 -no 
bootloader. Both the mt and the P schematics actually say 9VAC, but 
the documentation says 6VAC 9VDC.

Good luck!
Anders



--- In lpc2000@yahoogroups.com, "nma550n" <nma550n@...> wrote:
>
> Anders,
> 
> I actually have the P2106 board and not the 2106mt board. I 
> originally did not think the problem with the boot loader was 
> anything hardware. 
> 
> I'm not sure if this will sort out the problem with my board, as 
> there is no need to have the voltage as high as 12v (as far as i 
can 
> see).
> I will still give this a go though.
> 
> You say at 9 v your Tx line is 0v. What is it at 12v?
> Just trying to tie things together here. At work at the moment and 
> can't test things till I get home.
> 
> Thanks for all your help.
> 
> Nick
> 
> --- In lpc2000@yahoogroups.com, "kjellberg_anders" <akj@> wrote:
> >
> > 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]
> > > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>