I have been trying to work through some PocketBeagle power weirdness. I have an external battery backed supply which outputs 5V. If I route power into Vin (P1.1) I run into problems with glitches from my power supply when I plug or unplug a USB charger. The worst problem seems to be that VBAT gets a charge on it so that PocketBeagble won't start until I temporarily short VBAT to ground. The other problem I get is sometimes the PocketBeagle will reboot. My PS may not be perfect, but I have not been able to find on the scope anything that explains this.
So, I moved my power input over to VBAT. I no longer have rebooting issues nor any problems unplugging or plugging the charger. But, all the 3.3V and Vout pins are still powered when the PocketBeagle is "Off." VIN-USB (P1.7) seems to turn on and off with the PB power LED. Vout (P1.14) stays at 5V regardless of whether the PB is on or off, which means my connected circuitry stays on and drains power when things should be off. >From what I can tell, VIN seems to have a different brownout threshold than VBAT, but I have no explanation for VOUT being on continuously when VBAT is applied. Thoughts? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/f4d25ff7-0aa1-4312-9133-bbd680cd6405%40googlegroups.com.
