-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: | On 8/20/08, Andy Green <[EMAIL PROTECTED]> wrote: | | |> So, which pins still have any high level that can feed GSM side through |> protection diodes in this situation? CPU doesn't have any rail above 0V... | Sorry for herding goats.
Lol | MY understanding was we talk about | | CPU up _and_ GSM down. | | i.e. airplane (save) mode or some other conserving mode. Joerg definitely wasn't talking about that when you replied to him starting this subthread: ''This power removal is done by U1705, and it should relyably cut power when we disable IO_3V3 what is quite normal for shutoff.'' For GSM off state with everything else powered, as I said it would be more certain if we had the power to the PA switched but we don't. Looking at leakage, the only path seems to be UART TX and handshake output side stuff from CPU being high. The power-on thing is by an NPN transistor that is OC when off. So I guess it's true if we don't take care to put these to GPIO output '0' when we turn GSM off, we ought to do it, for the reason you mention. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAkir6QUACgkQOjLpvpq7dMp/pgCdFByXSppFn6a6VXx3eBi1RoMC 0Z8AnRTNzR4yWx/OgdshnB3oq3Jxb52H =MwJ0 -----END PGP SIGNATURE----- _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
