From: Chris C. <Cot...@ya...> - 2010-11-11 15:41:03
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Hi Rok, I would still be tempted to look at your power supply system. I had similar issues with an Overo Water when running it at 3V3, and they were cured by increasing the supply to 3.4V The tps65950 data sheet contains the following paragraph: "2.7 V is the minimum threshold for the battery at which the device will turn OFF. However, the minimum voltage at which the device will power ON is 3.2 V ±100 mV (if PWRON does not have a switch and is connected to VBAT) considering battery plug as the device switch on event. If PWRON has a switch then 3.2 V is the minimum for the device to turn ON." Your supply, if 2% low would be as low as 3.234V, which, given the tolerances of the tps65950, is actually 66mV *below* the stated voltage at which the tps65950 is guaranteed to boot up. Chris Cotton > Have you rigorously tested your power system? Yes. The rise time and voltage are the same, no mater what condition. We are powering overo with 3.3V. The voltage is in range of +-2%. Rise time is approx 1ms (10-90%). Rok -- View this message in context: http://old.nabble.com/Not-booting-overo-water-r2516-on-low-temperatures-tp30172521p30191178.html Sent from the Gumstix mailing list archive at Nabble.com. |