GTA02 Power Glitch Reason Found
Andy Green
andy at openmoko.com
Tue Feb 5 11:48:07 CET 2008
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Somebody in the thread at some point said:
Hi Allen -
> I have a suggestion for putting a capacitor GTA02v5. I check the PCB,
> it is not easy to rework it. We must remove R1766(EXTON3) and R1741
> (KEEPACT pull down resistor) and put a 0402 capacitor (1u,6.3V)
> between these resistor. Therefore, EXTON3 will have noise and we
> don't have KEEPACT function (always pull high).
I didn't understand yet what we used KEEPACT for anyway, if we're sure
its okay to lose it then fine.
But the later datasheet I found recommends 22uF for this task, although
it was better for me with 1uF (than 0uF) I think if we are going to
attack it we should really resolve it according to NXP recommendation if
possible. And that won't fit in 0402.
I found it was possible to fit a tantalum cap in the space as in the
picture I sent, but I agree it isn't easy: maybe the factory will have
an opinion.
- -Andy
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (GNU/Linux)
Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org
iD8DBQFHqD7QOjLpvpq7dMoRApjBAKCDyoMWIRvsoNp0oPLvsOn2P77RdACbBQ4C
iYiLxVPkmMZESVGLgEKGgYI=
=1RhQ
-----END PGP SIGNATURE-----
More information about the openmoko-kernel
mailing list