OzGrant 22 Posted March 23, 2014 Share Posted March 23, 2014 G'day, My F5529 launchpad powers up ok when connected to a PC USB port, but when I plug the USB cable into a plugpack USB powersupply, the launchpad is dead. Any ideas why. Quote Link to post Share on other sites
hogemark 5 Posted March 23, 2014 Share Posted March 23, 2014 Hi Reading http://www.ti.com/lit/ug/slau533a/slau533a.pdf should give you answers, it has some pages on power sources. I was struggling with the same issue, but got it to work. You have to remove some of the headers, I think it was the "SBW*" ones, but read the pdf, and report back exactly what pin headers you had to report. Alf pabigot 1 Quote Link to post Share on other sites
pabigot 355 Posted March 23, 2014 Share Posted March 23, 2014 I did notice this behavior with the rev 1.4 EXP430F5529LP (which has a red underside). The rev 1.5 EXP430F5529LP (white underside) can be powered from a plugpack. I didn't pursue this clue further as it's the 1.5 ones I plan to deploy around the house (someday...), but this behavior is confirmed by slau533a, though no workaround is mentioned. I suppose if you break out a USB cable and connect the 5V/GND to the correct BoosterPackXL pins it could work, though not being an EE I worry that there might be some power conditioning/boost/buck converters that would get bypassed. Quote Link to post Share on other sites
RobG 1,892 Posted March 23, 2014 Share Posted March 23, 2014 Version 1.4 (slau533,) of the F5529 LaunchPad had to be connected to USB host, otherwise the hub (IC401) would not enable the power (U401/U403.) This "feature" was fixed in 1.5 (slau533a.) One way to fix this would be cutting *PWRON traces near U401 and U403 and grounding them. Since *PWRONx outputs of IC401 are push-pull, they have to be left unconnected (it works, but I don't take any responsibility ) OzGrant and pine 2 Quote Link to post Share on other sites
spirilis 1,265 Posted March 23, 2014 Share Posted March 23, 2014 Didn't realize they fixed this, very nice. Sent from my Galaxy Note II with Tapatalk 4 Quote Link to post Share on other sites
OzGrant 22 Posted March 23, 2014 Author Share Posted March 23, 2014 Thanks all, will do the scrape and solder trick when I get back home. Quote Link to post Share on other sites
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