-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: | Andy Green wrote: |> This is for the 500mA question? Dunno yet, there can be pins on FTDI |> that change state under this circumstance. | | There is :) Pin 41, PWREN# (nPWREN in Openmoko terminology).
Great. But I have been reading the pcf50633 datasheet and we have to take a lot of care about this. Although there is a USB -> SYS programmable current limit, there isn't one for adapter -> SYS. We have only two handles to use on this path ~ - dynamically claim adapter power is not present under MSP430 control (we decide this externally anyway), so pcf50633 will not enable the adapter -> SYS FET at all until we know we are good for <=500mA ~ - set charging current to zero What we can't do is set current limit from adapter as we can on USB. We cannot actually treat it as a second USB interface for pcf50633 purposes as it is I think. |> I have a scheme for |> detecting charger insertion though and that is what is critical. | | Ah, that sounds interesting. Have you figured out a way to detect | shorted D+/D- ? Yes I have a plan I will post about. BTW I saw while looking at it that it seems D- USB pin on GTA02 is floating when GTA02 charger is connected. |> | to have a only 'dumb power' and 'jtag' port would be somehow missing the |> | point. especially when its behind a flap with screws. |> |> That's what we try to clear up... | | In use cases where you need external power while on the go with USB, | you probably wouldn't want to have to disassemble your Neo all the | time. E.g., I think "backup to external storage" would be a plausible | use case. Right. | Also, how could an "internal" receptacle be placed such that no crazy | mechanics are needed and the plug doesn't interfere with anything | else ? I imagined if the USB socket is like this (B=battery) s BBB ~ BBB ~ BBB we could mate to it (c = cable) s BBB c BBB c BBB c but I agree external access will be more certain and better and waste less space. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAkgZngEACgkQOjLpvpq7dMoelQCfWWkISdvHHuJyGyco0lpihenR Ui4An2q6m+PaMiyyE4mCTJcEuLFnSpzP =UWxs -----END PGP SIGNATURE----- _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
