On Fri, Oct 09, 2009 at 12:03:07PM -0300, Werner Almesberger wrote: > From discussion with Joerg on IRC: > > - HP/SPKRVDD are fed by AVCC_CODEC, which is fed by CODEC_3V3, which is > fed by LDO2. LDO2 has a maximum current of 50 mA. Joerg says we need > at least ~150 mA. > > So that's a big problem. Thanks for catching it !
Definitely. > GTA02 supplies the audio amp directly from VB, but since HP/SPKRVDD > are limited to 3.6 V, we can't use VB (or VSYS) directly. s/GTA02/GTA01/ > Oh, and did anyone notice that the audio amplifier is not powered in > GTA02 if running from USB with the battery removed ? My GTA02 hasn't noticed yet, no. (For a moment I thought you were right, until I noticed that the speaker was about half a metre away from the rest of my partially disassembled Neo, thereby providing a plausible (and correct) explanation for the missing audio output. :-) > Opinions ? I'd say reassign the PMU LDOs. I can't imagine that their overcurrent protection won't be sufficient to prevent damage. -- Rask Ingemann Lambertsen Danish law requires addresses in e-mail to be logged and stored for a year _______________________________________________ gta02-core mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/gta02-core
