Forums

OLIMEX LPC P2148 power supply

Started by koutote October 19, 2009
Hi,

I just bought an OLIMEX P2148 board. Do I have to buy also
a 6V DC power supply for the board or is it OK connecting it
to the PC via USB and getting power from USB?

Thanks
/Kostas

An Engineer's Guide to the LPC2100 Series

--- In l..., "koutote" wrote:
>
> Hi,
>
> I just bought an OLIMEX P2148 board. Do I have to buy also
> a 6V DC power supply for the board or is it OK connecting it
> to the PC via USB and getting power from USB?
>
> Thanks
> /Kostas
>

That board isn't wired to use USB for power. I have the board and I always use the wall wart.

Richard

On Mon, Oct 19, 2009 at 12:10 PM, koutote wrote:
>
> Hi,
>
> I just bought an OLIMEX P2148 board. Do I have to buy also
> a 6V DC power supply for the board or is it OK connecting it
> to the PC via USB and getting power from USB?
>

You can power the board EITHER by USB OR by external 5v supply but not
both at the same time.
I have OLIMEX LPC-H2148 header board and I use USB power when it's
plugged to USB, and I use the 5V supplied externally by the
OCD-ARM-JTAG wiggler on EXT2.23 (Vin) and EXT2.25 (GND) pins when USB
is not plugged.

Cheers,

Tayseer
>
> Thanks
> /Kostas
--
Mohamad Tayssir Alkowatly
THANK you both for your quick answers.
Mohamad actually my board is the P2148 and not the H2148.
On board and on olimex web says that it needs 6V AC or
9V DC.
Richard I powered the board from wall mart with a 8.4V DC.
Power led is ON and the two leds (LED1 and LED2) are blinking.
Is it OK or is it a code that voltage is not enough?

I wish that OLIMEX would provide some more information for
the board.

/Kostas

heh if you are to learn about electronics you should be able to read a datasheet and schematic:

Site:
http://www.olimex.com/dev/lpc-p2148.html

Schematic:
http://www.olimex.com/dev/images/ARM/LPC/LPC-P2148-REV-D-sch.gif

Notice the power supply is from a LM1117. Now you know the part. Find how much power it can handle:

Datasheet (LM1117):
http://www.national.com/mpf/LM/LM1117.html

Input Max Voltage = 15 Volt

You are safe until then. They recommend less because the board doesnt use a lot. The more you supply and less you use the more heat that is generated by the supply.

So you are safe to use upto 15v...

The LEDs blinking is just the demo program on the boards LPC2148.

--- In l..., "koutote" wrote:
>
> Hi,
>
> I just bought an OLIMEX P2148 board. Do I have to buy also
> a 6V DC power supply for the board or is it OK connecting it
> to the PC via USB and getting power from USB?
>
> Thanks
> /Kostas
>

----- Original Message -----
From: "koutote"
To:
Sent: Monday, October 19, 2009 7:10 PM
Subject: [lpc2000] Re: OLIMEX LPC P2148 power supply
>
> THANK you both for your quick answers.
> Mohamad actually my board is the P2148 and not the H2148.
> On board and on olimex web says that it needs 6V AC or
> 9V DC.
> Richard I powered the board from wall mart with a 8.4V DC.
> Power led is ON and the two leds (LED1 and LED2) are blinking.
> Is it OK or is it a code that voltage is not enough?
>
> I wish that OLIMEX would provide some more information for
> the board.

That probably means that it's working.

Leon
--- In l..., "leon Heller" wrote:
>
> ----- Original Message -----
> From: "koutote"
> To:
> Sent: Monday, October 19, 2009 7:10 PM
> Subject: [lpc2000] Re: OLIMEX LPC P2148 power supply
> >
> > THANK you both for your quick answers.
> > Mohamad actually my board is the P2148 and not the H2148.
> > On board and on olimex web says that it needs 6V AC or
> > 9V DC.
> > Richard I powered the board from wall mart with a 8.4V DC.
> > Power led is ON and the two leds (LED1 and LED2) are blinking.
> > Is it OK or is it a code that voltage is not enough?
> >
> > I wish that OLIMEX would provide some more information for
> > the board.
>
> That probably means that it's working.
>
> Leon
>

There is a sample program shipped with the board. Don't worry about the LEDs.

All you are going to get is a schematic.

There is a schematic and some sample code here: http://www.sparkfun.com/commerce/product_info.php?products_idT5

There is VERY GOOD sample code here: www.jcwren.com/arm

There is a bunch of code in the Files folder of this group.

When you google for data re: the chip, you want the User Manual. The datasheet (a separate document) is more related to electrical than software.

Richard