USB Charging I-Pad

540 will not charge or will the i pad show a charge from the 540.

The latest iPads require 10 watt chargers and therefore the 2.1 amp output of the IFD'S USB is totally adequate.
One earlier model of the iPad was supplied with a 12 watt charger but never 15 watts.
See the following.....
https://discussions.apple.com/message/24548751#24548751

Edited by DH82FLYER - 10 Sep 2015 at 7:03am

Thanks guys,

Edited by Leonard - 19 Mar 2015 at 10:48pm

What's the bus voltage on your airplane - 12 or 24 volts?

Figure 4.11 of the IFD540 Installation Manual says that if the input voltage to the IFD540 is less than 18 volts, the USB port drops from high power to low power charging.

If the input voltage is less than 12.75 volts, the USB charging port is turned off

If you have an older airplane with a 12 volt electrical system your normal bus voltage will be around 14 volts. So you should be able to charge a low power device from an IFD540. But you will never be able to charge an iPad.

Mike

That's what I figured. It's too bad that this information is so obscure. You shouldn't have to dig through the installation manual to find it.

Mike

DDGates

Agreed.  That's why I added this section to the Rel 10.1 version of the Pilot Guide:

Hah, correct but yes, that feels like the definition of "picking nits".......

There are dimming bus calibrations that can/should be run that may have a real impact for you. Those procedures are in the Install Manual.

Okay. And when you're at it, note the setting in bottom left corner - photocell or dimming bus.

Just finished a 2.5 hour flight. The IFD540 was flawless and charged my Ipad Air. My Mooney Ovation has a 28v system.

Is this the same cord?

It was an oem Apple cord. It was the same one both times but it fits my computer with no problem. I'll try a different one just to check. It's just strange that it went in so passively.

Never heard of these problems before.  I use iPad charging capability (and phone and other device) on virtually every sortie using both OEM and aftermarket cables on multiple IFDs.

Where did you find this note about the difficulty of removing the usb from March 2015?  I see nothing about this in the new 10.1 Pilot Guide.  One other question on charging is why does the iPHONE turn itself back on automatically. When charging it today in flight, I shut it off so it would charge quicker.  The phone turned itself back on within 10 secs.  I tried a few times with the same result.  Does the 540 do something to cause this restart of an iPHONE?

I agree.  I am shutting it down after it is connected to the charging device and it boots back up again within 10 secs.  I then shut it down again, and it boots back up again....

Correct. Not the IFD itself.   It is not possible for me to keep an iPhone off during the charge via the USB as it re-boots back on as soon as I turn it off.

Negative.   Plugged in the charging cable and verified charging.  I then,  manually turned off the phone and it rebooted back on within about 10 secs.  I again turned it off with the same result.  I have been seeing this behavior for a long time (I think even before 10.1) but always just assumed that I really didn't turn the phone off as I thought I did.  Last flight, I watched the entire time as the phone turned off but then rebooted back on as I was watching. I repeated this a few more times with the same result.  This same phone does not exhibit this behavior when charging from a computer or outlet.   Jake, obviously this is not a big deal and certainly Avidyne doesn't need to be concerned about my phone turning itself back on during charging but I was just wondering if anyone else has seen it.

Teeth6

Edited by Leonard - 16 Sep 2015 at 5:50pm