Disconnecting and reconnecting the USB does not work with either the dongle or Android phone. I am currently running the device from the 5V rail. Don't know if that might have an effect. Also my pot is set to give max current to the device.
On Wednesday, 14 January 2015 19:40:14 UTC+2, Ytai wrote: > > I've never encountered this problem. When this happens, what happens if > you don't power-cycle, but rather disconnect and reconnect USB? > > On Mon, Jan 12, 2015 at 9:12 PM, Andries Kruger <[email protected] > <javascript:>> wrote: > >> Thanks for the reply, I'll make use of an external regulator then for the >> time being. >> >> One more thing: I've been using a 12V DC power supply for the IOIO. A lot >> of the times when I turn the power supply on, the IOIO powers up but does >> not charge the phone or power a Bluetooth dongle, I then have to remove the >> crocodile clip that powers the device and put it back before it powers the >> phone or dongle. I'm thinking it is my power supply that is a bit shaky. >> Any idea what might be causing this and how I can prevent it. >> >> On Monday, 12 January 2015 19:32:54 UTC+2, Ytai wrote: >>> >>> The issue is still under investigation. If you're curious, here's the >>> thread I've been keeping with TI engineers to try to resolve it: >>> http://e2e.ti.com/support/power_management/non-isolated_ >>> dcdc/f/196/p/390774/1379558#1379558. The issue is now believe to be >>> more associated with load (output) switching rather than line (input) >>> switching and has only even been observed with 12V or above. >>> A Zener or TVS would not help you here (you don't have enough margin). >>> The next revision of the IOIO, as soon as this issue is resolved, will >>> contain a simple protection circuit comprising a Zener and a FET that >>> protects the voltage surges. However, this is known to be insufficient >>> (because the failure had been observed with this circuit in place, while >>> monitoring Vin and asserting that it has not exceeded the maximum ratings). >>> One thing that you can probably do in the near term if you have to use >>> 12V input is step-down the 12V to, say, 9V using an external regulator that >>> is more robust. >>> >>> On Mon, Jan 12, 2015 at 6:57 AM, Andries Kruger <[email protected]> >>> wrote: >>> >>>> Hi all, >>>> >>>> So my VREG finally fried today. It might have been one of two things >>>> that fired the VREG: >>>> 1) Might have happened when I plugged in my phone >>>> 2) Was using a new power supply and might have happened when I powered >>>> on the supply. >>>> >>>> For my applications, I will need to be running from a 12V power supply. >>>> I know the IOIO isn't great with anything more than 10V but I have no >>>> choice. I have ordered a new VREG and will hopefully be replacing this one >>>> in a week or so. >>>> >>>> My questions are: >>>> 1) Can I protect my IOIO with a Zener diode or TVS over Vin? >>>> 2) If this is possible, does anyone know of a nice TVS or Zener with >>>> the best possible spec to do this? >>>> >>>> Thanks. >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "ioio-users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> Visit this group at http://groups.google.com/group/ioio-users. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "ioio-users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at http://groups.google.com/group/ioio-users. >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/d/optout.
