LPC11C24 CAN_H/CAN_L pins

Started by "Jea...@gmail.com [lpc2000]" May 14, 2014
Hi:

I have a question with regards to the CAN_H and CAN_L pins of the LCP11C24.
My understanding is that this microcontroller integrates a CAN transceiver,
and these pins can be directly connected to the hardware layer of CAN bus.

Looking at reference designs, one of them for the MCB1000-vers26 (which I
believe is the latest available) shows on sheet 2 that the CAN_H/CAN_L are
connected to an external transceiver (TJA1040).

Could anybody confirm that this is a mistake, and that these pins can be
used directly on a CAN bus link?

Regards,
JS

An Engineer's Guide to the LPC2100 Series

On 14.05.2014 16:11, Jean-Sebastien Stoezel j...@gmail.com
[lpc2000] wrote:
> Looking at reference designs, one of them for the MCB1000-vers26 (which
> I believe is the latest available) shows on sheet 2 that the CAN_H/CAN_L
> are connected to an external transceiver (TJA1040).

Are you sure it was LPC11C24 in the schematic? The one I found, had
LPC11C14.

--

Timo



Hi:

Thanks for the reply. This is the schematic I am referring to:
http://www.keil.com/mcb1000/mcb1000-schematics.pdf which shows am LPC11Cxx
device. You are right this is not an LPC11C24 but an LPC11C14.
I had assumed the development board was generic to the LPC11Cx4.

Indeed the LPC11C14 does not integrate the transceiver.

Regards,
JS

On Wed, May 14, 2014 at 10:04 AM, Timo t...@gmail.com [lpc2000] <
l...> wrote:

> On 14.05.2014 16:11, Jean-Sebastien Stoezel j...@gmail.com
> [lpc2000] wrote:
> > Looking at reference designs, one of them for the MCB1000-vers26 (which
> > I believe is the latest available) shows on sheet 2 that the CAN_H/CAN_L
> > are connected to an external transceiver (TJA1040).
>
> Are you sure it was LPC11C24 in the schematic? The one I found, had
> LPC11C14.
>
> --
>
> Timo
>
>
>
On 14.05.2014 18:11, Jean-Sebastien Stoezel j...@gmail.com
[lpc2000] wrote:
> Thanks for the reply. This is the schematic I am referring to:
> http://www.keil.com/mcb1000/mcb1000-schematics.pdf which shows am
> LPC11Cxx device...

Ah, Ok. Actually it was LPC11Cxx in the schematic from NXP site too but
the file title said "Keil LPC11C14 Eval Board Schematic". Quite
confusing indeed...

--

Timo



Hi Jean Sebastien,

Check the schematics here on LPCWare.com
http://www.lpcware.com/system/files/LPCXpressoLPC11C24revB.pdf http://www.lpcware.com/system/files/LPCXpressoLPC11C24revB.pdf

See sheet #5.

BTW: The Keil schematics were created at a time when the LPC11C24 was not a existing part.

Regards,
Ken