ok i -think- i know what the deal is with the iphone and ipod touch...
a few months ago the inductor i used to use, Bournes #6000-220k was discontinued. I found an 'equivalent' replacement part from digikey which is actually just slightly not as good (although tests all the devices i had access to were OK). as a result, because of the huge battery on the iphone (and probably ipod touch), the drain on the mintyboost when using rechargable (or weak) batteries is too much for the device and it thinks its charging but its actually not. as a result, it drains both batteries. however, it doesnt seem to be a problem with fresh alkalines.
SO
if you have an iphone or ipod touch...
TRY
using nice fresh batteries. and post your results.
i think ive located a higher quality inductor replacement, although it may take a month or 2 to get here. guh.
iphone/itouch problem investigation...
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Please be positive and constructive with your questions and comments.
- moses_410
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ipod touch frustrations
I still haven't been able to get my ipod touch to charge from any of the Mintyboost (and iterations) I have pieced together.... The frustrating thing is I have a 3rd Gen Nano and ipod Classic here that seem to always take a charger from my Mintyboosts.
I went to Whistler BC, Canada over Xmas to ski and because I couldn't get the MintyBoost to work I overnighted myself a do-it-all Belkin Dual USB Charger (2x 5V @ 550mAh) that I thought would do the trick... big let down... and I didn't take my computer... but I at least I had my trusty 2nd Gen Shuffle along.
I am Uber tired of messing with trying to get my touch to charge. All of my old add-on's for my ancient 3rd Gen ipod seem to charger the touch (3rd Gen ipods were Firewire).
Anybody have a clue as to exactly what is preventing the touches and iphones from being able to accept a charge from a Minty Boost?
I went to Whistler BC, Canada over Xmas to ski and because I couldn't get the MintyBoost to work I overnighted myself a do-it-all Belkin Dual USB Charger (2x 5V @ 550mAh) that I thought would do the trick... big let down... and I didn't take my computer... but I at least I had my trusty 2nd Gen Shuffle along.
I am Uber tired of messing with trying to get my touch to charge. All of my old add-on's for my ancient 3rd Gen ipod seem to charger the touch (3rd Gen ipods were Firewire).
Anybody have a clue as to exactly what is preventing the touches and iphones from being able to accept a charge from a Minty Boost?
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Could it be that they are avoiding violation of the USB standard and refusing to charge unless one of the following conditions are satisfied?
1) Some pin on the device side of the charging cable is grounded, indicating the presence of a "dumb" charger
2) An actual USB connection (including a request for 500 mA instead of 100 mA) is made to a USB host.
This is a known issue with many phones with MiniUSB jacks, for example. No HTC phone will charge from a "dumb" charger using a standard USB sync cable, in order to avoid violating the USB specifications (a device is not allowed to draw more than 100 mA without asking).
To charge from a "dumb" charger, many MiniUSB devices check to see if a pin on the MiniUSB connector that is normally not connected is grounded. If it is, it assumes that a "dumb" charger is present and uses as much current as is available. Maybe newer Apple devices have a similar method of detecting "dumb" chargers?
1) Some pin on the device side of the charging cable is grounded, indicating the presence of a "dumb" charger
2) An actual USB connection (including a request for 500 mA instead of 100 mA) is made to a USB host.
This is a known issue with many phones with MiniUSB jacks, for example. No HTC phone will charge from a "dumb" charger using a standard USB sync cable, in order to avoid violating the USB specifications (a device is not allowed to draw more than 100 mA without asking).
To charge from a "dumb" charger, many MiniUSB devices check to see if a pin on the MiniUSB connector that is normally not connected is grounded. If it is, it assumes that a "dumb" charger is present and uses as much current as is available. Maybe newer Apple devices have a similar method of detecting "dumb" chargers?
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charger not charging
Nope, the Belkin Dual USB charger did not charger my ipod touch... it was great that it came with charging cables (dock connector, MiniUSB, and Shuffle). I tried using my data cable that came with my ipod with the Belkin charger without any luck either... I am very hesitant to buy an Apple brand USB charging brick now... although I am curious to see if their charger works (I am sure it does) and to possibly tear it to pieces to see how they make it work... actually I think I just talked myself into wasting another $30
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Check Boxwave.com - they specialize in (among other things) "dumb charger" USB cables.
They sell some sort of charge adapter required to charge the Touch (and some other iPods) with "dumb" chargers such as the ones Boxwave sells.
It might be that all you need is that adapter (or a similar circuit, if someone knows what's in that adapter).
They sell some sort of charge adapter required to charge the Touch (and some other iPods) with "dumb" chargers such as the ones Boxwave sells.
It might be that all you need is that adapter (or a similar circuit, if someone knows what's in that adapter).
- ohararp
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Ladyada,
You should check out www.coilcraft.com . They do free samples and are really great to work with.
You should check out www.coilcraft.com . They do free samples and are really great to work with.
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Re: itouch
I tried it with the 560k resistors, but didn't seem to help. I had the iPod off and it only moved from 10% to almost 20% over 4 hours. It did drain the battery quite a bit.
I think the only solution is to goto a different MAXIM chip. I was looking at the MAX1700. Of course that would me a new circuit design and a understanding of surface mount soldering.
Sidney
I think the only solution is to goto a different MAXIM chip. I was looking at the MAX1700. Of course that would me a new circuit design and a understanding of surface mount soldering.
Sidney
bluerondo wrote:try putting two 560k resistors from 5v to both D lines to make it charge. I don't know if there's enough power in 2 as's to fully charge an itouch. It depends on the ah of the itouch battery.
Please be positive and constructive with your questions and comments.