From: R. P. M. <log...@gm...> - 2010-02-09 09:46:20
|
> When is SYS_EN toggled? By the PMIC. It is not controllable from software. The exact details of when it becomes active is in the docs. I would tell you but I don't know off hand. http://focus.ti.com/docs/prod/folders/print/tps65950.html On 2/9/10, Thierry Genovese <t.g...@gm...> wrote: > Hi, > > This is interesting. It looks like you are right about the VCC_1.8V > signals on the 40-pin and 60-pin connectors. The 1.8V is generated on > the expansion board, and does not come from the COM itself. > > The following pages would need to be corrected then: > http://www.gumstix.net/Hardware/view/I/O-connectors-cabling/Gumstix-Overo-60-pin-header/112.html > http://www.gumstix.net/Hardware/view/I/O-connectors-cabling/Gumstix-Summit-board-40-pin-header-SV1/112.html > > When is SYS_EN toggled? By the TPS65950 when its input is stable? By > uboot? Or is it as late as when linux boots? > > Regards, > > Thierry > > > On Mon, Feb 8, 2010 at 11:51 PM, R. P. McMurphy <log...@gm...> wrote: >> The 1.8V on the Summit board 40 pin connector does not come from the >> Overo PMIC. It comes from the MIC5247 mounted on the Summit board. The >> output is only enabled when SYSEN is output from the Overo module so >> the Overo must be up first before you get 1.8V. >> >> The Micrel webpage say it 150mA but some of that is used for the FTDI >> I/O and as a voltage reference for the video driver. >> >> http://www.micrel.com/page.do?page=product-info/products/mic5247.shtml >> >> On 2/9/10, Tyler Southard <sou...@gm...> wrote: >>> >>> Hi, >>> >>> I was trying to find the current rating for the VCC_1.8 pins on the >>> Summit >>> board (pins 26 and 16) in the manual for the tps65950, but I couldn't >>> find >>> it... Does anyone know how much current I can draw from those pins to >>> power >>> other electronics? >>> >>> Also, the voltage level on the RxD1 pin (pin9) on the Summit reads around >>> 0-160mV, not 1.8V. Does anyone know why it would do this or what I can do >>> about it? >>> >>> Thanks, >>> Tyler >>> -- >>> View this message in context: >>> http://old.nabble.com/Summit-1.8V-current-draw-and-rxd-level-tp27507073p27507073.html >>> Sent from the Gumstix mailing list archive at Nabble.com. >>> >>> >>> ------------------------------------------------------------------------------ >>> The Planet: dedicated and managed hosting, cloud storage, colocation >>> Stay online with enterprise data centers and the best network in the >>> business >>> Choose flexible plans and management services without long-term contracts >>> Personal 24x7 support from experience hosting pros just a phone call >>> away. >>> http://p.sf.net/sfu/theplanet-com >>> _______________________________________________ >>> gumstix-users mailing list >>> gum...@li... >>> https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >> >> ------------------------------------------------------------------------------ >> The Planet: dedicated and managed hosting, cloud storage, colocation >> Stay online with enterprise data centers and the best network in the >> business >> Choose flexible plans and management services without long-term contracts >> Personal 24x7 support from experience hosting pros just a phone call away. >> http://p.sf.net/sfu/theplanet-com >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > > ------------------------------------------------------------------------------ > The Planet: dedicated and managed hosting, cloud storage, colocation > Stay online with enterprise data centers and the best network in the > business > Choose flexible plans and management services without long-term contracts > Personal 24x7 support from experience hosting pros just a phone call away. > http://p.sf.net/sfu/theplanet-com > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |