Lpc2000

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Ed Schlunder wrote:
> I'm thinking of building the DIY wiggler so that I can program and
> debug some LPC2103 chips on the cheap.
> 
> I see the wiggler.txt schematic in the files area. It is using a
> 74AC244 chip to do voltage level conversion between the PC and the
> LPC21xx chip. It only seems to use 4 line drivers of the 74AC244 chip
> (half the chip is left unused).
> 
> Would there be any problem with using a 74VHC08 quad 2 input AND gate
> chip instead? I would just tie one side of each AND gate high so that
> it can be used as 4 line drivers. This chip is cheaper and smaller
> than the 74AC244.
> 
> The schematic also uses a DTC114 NPN transistor. I don't have any
> DTC114 transistors. Would MMBT3904 work okay instead?
> 
> Any other tips for a DIY wiggler?

I just bought an Olimex Wiggler clone, it cost about 24 euros.
It can't make it work very well with OCDRemote (only at the
lowest speed), but it works without any problems with OpenOCD.

Perhaps we can improve upon the existing designs and create
the ultimate low-cost ARM JTAG cable, yet keeping it simple.
Some ideas:
* provide proper current limiting for all lines
* add readback of the RTCK signal (return clock)
* add readback of the targets' VCC (like the Olimex clone does)

Regards,
Bertrik
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFDzAZAETD6mlrWxPURAgroAKCiDhAnOg794zgDivP0gBkD2rnN6QCeKoO6
oC4YyJ70cmrDaWRGl2V8+rY=
=khuy
-----END PGP SIGNATURE-----