Does anyone here use your NC with a Macbook Pro? When I connect my NC to my Macbook, it often tells me that the USB port is drawing too much power and then disables it. It even did that when I had only the USB end plugged in (without the NC).
So then I thought maybe it was my USB port on my Macbook and plugged my iPhone in and that sync'd just fine.
Ideas?
Standard usb draw is 500mA, whereas the nook pulls down 1900... No idea what the max output on a mac is, but its just going to suck down as much as it can, Id imagine...
Sent from my NookColor using XDA app
Usb spec lists 500mA as the max thata device can ask for. And the devices have to ask for that much.
It'll give them 100mA otherwise. I highly doubt that your NC is trying to draw that much from a standard usb port since that is not complying to standards and could fry whatever the nc is plugged into.
That would also make bn liable for the damage. Perhaps apple changed their usb to allow more current so that apple products can charge faster, perhaps the nook thinks that its plugged into the wall and can pull that much, perhaps the cable is slightly messed up, if that is how nc checks how much current it can draw. Which I'm sure it is since it won't fast charge from a normalcable.
Either the usb port is messed up or the cable is messed up or you've been ****ing with settings that shouldn't be touched. That's all I know. Trya different computer, or a different cable. This is too large of a bug for bn to let it into the wild. Something is nonstandard with your setup.
specs
Usb spec lists 500mA as the max thata device can ask for. And the devices have to ask for that much.
It'll give them 100mA otherwise. I highly doubt that your NC is trying to draw that much from a standard usb port since that is not complying to standards and could fry whatever the nc is plugged into.
That would also make bn liable for the damage. Perhaps apple changed their usb to allow more current so that apple products can charge faster, perhaps the nook thinks that its plugged into the wall and can pull that much, perhaps the cable is slightly messed up, if that is how nc checks how much current it can draw. Which I'm sure it is since it won't fast charge from a normalcable.
Either the usb port is messed up or the cable is messed up or you've been ****ing with settings that shouldn't be touched. That's all I know. Trya different computer, or a different cable. This is too large of a bug for bn to let it into the wild. Something is nonstandard with your setup.
Rereading your post your cable seems tobe the problem. Take it to bn store and ask them if you can try a different cable since yours seems to be messed up. If they give you problems go above their heads. Customer service people don't always know what they are doing.
10equals2 said:
Usb spec lists 500mA as the max thata device can ask for. And the devices have to ask for that much.
It'll give them 100mA otherwise. I highly doubt that your NC is trying to draw that much from a standard usb port since that is not complying to standards and could fry whatever the nc is plugged into.
That would also make bn liable for the damage. Perhaps apple changed their usb to allow more current so that apple products can charge faster, perhaps the nook thinks that its plugged into the wall and can pull that much, perhaps the cable is slightly messed up, if that is how nc checks how much current it can draw. Which I'm sure it is since it won't fast charge from a normalcable.
Either the usb port is messed up or the cable is messed up or you've been ****ing with settings that shouldn't be touched. That's all I know. Trya different computer, or a different cable. This is too large of a bug for bn to let it into the wild. Something is nonstandard with your setup.
Click to expand...
Click to collapse
Actually, there isn't anything nonstandard about my setup. I use my macbook stock for everyday things like email, web, etc.
Sent from my XDA app on my Nook Color
eyecrispy said:
Actually, there isn't anything nonstandard about my setup. I use my macbook stock for everyday things like email, web, etc.
Sent from my XDA app on my Nook Color
Click to expand...
Click to collapse
Not what I meant by nonstandard. I was referring to usb specs. A device can only get 500ma using the standards. If its trying to pull almost 2 amps, something is not adhering to the standards. Meaning somethings busted.
Thinking about it further, the cable might be shorted. I wish I knew what the device used to know that it can pull that much. That could give a clue. A device I used in the past used a 10k resistor between the usb data lines to signal fast charging was possible. Shrug. I wouldn't use that cable for anything til I checked it. If you have a normal micro usb cable, you can use that to charge by computer. It'll just take a lot longer, and the nc won't tell you its charging. But it won't supply enough power to charge while the device is active. Leave the screen off etc. Don't use the offbrand cable with the wallcharger since it might be able to handle 2amps. Risk bburning that up.
Sorry somethings up, wish I could help more. Goodluck.
I had the same issue on a notebook last night. I have never had this error before, but it happened while I was rooting. Scared me because nook would not turn on. I thought my Nook was fried, but it powered on after rooting was complete. Thank God!
Related
I have a friend who is visting the US (I'm from Canada) and I asked him to pick me up a nook. Not finding clear info in some of the reviews, mainly concerned about charging.
This charges over usb when hooked up to your computer right? Just want to make sure it doesn't use a proprietary cable for charging. I read on the ipad side, that older computers don't give out enough power to charge over usb, is that an issue with the nook?
What adapters/cables does it come with exactly? And is it just a standard mini-sub for the charging?
Also, this has a headset jack correct? I've read no bluetooth, I guess there's no way to get a mic working on this then.
Micro USB, will charge VERY slowly using a computer. Includes a 2amp wall socket and special cable to quick charge (still micro usb, just more pins). Has a headset port but does not come with a headset.
I've only had a few mobile devices. I read the ipad can charge over usb if the mobo supports giving out that extra juice. Some mobo's have a new firmware update to enable this.
The connector is micro-usb but just more pins. Hmm. so if the cable breaks or I misplace it no other micro-usb will charge it?
edit: i read a little more and found that it's 30 pin proprietary cable to speed up charging. I also read the galaxy tab does something similar.
Does anyone know if they use the same pin configuration? probably not, but I can get tab usb cables here.
I know you didn't ask for it but I'll tell you anyway
In case you are worrying about registering your device (mandatory at initial setup).
I'm NOT in the US and it worked fine.
Good to know. Thanks.
But I'm more concerned about charging it and relying solely on their cables.
I read the ipad can trickle charge on newer computers but some wouldn't provide enough power. Asus et al have released utilities to increase the power to the usb ports.
I can't post the links but endgadget has an article about it providing links to those utilites. They just talk of apple devices but does this work with the nook?
It comes with a charger for US-type sockets and only if you charge your nook with this (and yes, it is proprietary ) it'll charge quickly. It does seem to charge when you connect it to a standard PC USB port but at an extremely low rate.
On the device Micro-USB (not Mini) is used.
You say it does seem to, do you mean from personal experience? How slow? It sounds like that if you do own one it was so slow you didn't let it finish.
Like if it's 8hrs overnight, I can live with that, but I want to confirm that there is a plan b and not solely rely on their cables.
And as I mentioned asus and others released utils to give more power output to the usb (although these seem like their were only created for ipads). Wondering if those utils speed things up.
for ex, google asus ai charger to see what I mean.
I received my nook Color a mere few hours ago so I can't tell you a lot about its charging behavior It "seems" to load slower via standard USB... if you want to know about the details check one of the large threads on the NOOK and its rooting. I remember reading some information about the USB connector and its peculiarities there.
Ah you just got it. I see.
I found this on the root thread:
'
"There are 12 pins coming off the connector. It looks like there are no pins for the standard micro USB portion, only the extended 12 pins. 2 pins are used to bring in +5V, 2 pins are for signal ground providing a hefty circuit for the 2A charging. USB takes up two pins, and as far as I can tell 2 more are for each LED via current limiting resistors. Two more pins go to discretes that I haven't identified, and two more pins are unconnected. I'll take my scope to them when I have some time."
Not sure what he means when he says no pins for the standard micro portion...
Maybe the plug doesn't have standard USB pins, but the NOOK itself does have standard USB pins as well as the proprietary ones. Because I have trouble inserting the original B&N plug, I went out earlier today and bought a standard Micro USB cable...
I connected it to the nook and it said "not charging", so I went out to do some shopping (10-20 minutes max) and left it at 89%... when I came back it was at 93 %.
So it DOES in fact seem to charge albeit slowly.
Thanks. It's weird, lots of comments of its own cable not fitting properly.
As long as it charges with a normal cable I'm good.
I guess it is charging... however there is a slight chance, that it's NOT charging and the battery charge display is lying (de-calibrated). I don't think so, but I'll only know for sure after a few more days of using only the standard USB charger cable.
Is there any way to get the NC to charge off the USB port hooked to a PC and not the wall charger ?? Is it possible at all ?
amen to that. Its stoopid that you cant use a microusb for charging. I only have 50 of em. I know the vable is special but they should have made it a different design to not lead us on!
My NC charges just fine with a standard micro USB cable connected to either a wall charger or PC.
It displays "Not charging" but it does in fact charge.... however, it takes a lot longer than with the provided cable and wall-charger.
The socket on the NC has connectors for both standard USB and their proprietary stuff.
Correct me if I'm wrong but I think this is the same saga that iPad users went through. The device requires 2 amps to charge correctly, but a standard usb port only offers 500 milliamps or 1/4 of the required dosage. So while I havent tested it myself, it sounds feasible that the nook is charging, however its nowhere near the required amperage to show the charging icon on the device.
It sure does take a long time on a computer. Over night isn't enough. Even my Ipad charger takes for ever on the NC.
Charges just fine
Mine charges just fine, as long as I use the nook cable that came with it. I plugged it in to the PC this morning and it was only about 70% charged. I don't know how long it took, but when I grabbed it a few moments ago, the n was green and it was fully charged.
Mine charges from ~30% to 100% in about 3 hrs, via USB to a computer. I always make sure I use task killer to kill most processes before charging. It makes a huge difference.
after root I have been able to charge from usb. btw, despite the message below, this reply is sent from my NC via xda app.
Sent from my LogicPD Zoom2 using the XDA mobile application powered by Tapatalk
Been charging it from USB since day 1. As luck would have it, I forgot the wall plug at my friend's parents house, some 80 miles away... I was spending thanksgiving there when I got the NC. So yes, charging works from the computer, but as they said, it's slower. Not really a big deal though, I do this crazy thing at night called sleeping, during which I dont have much use for the NC, so it sits next to my bed, charging off of the laptop. And the cool thing is that it'll continue to charge even after my laptop goes into sleep mode.
isolated_epidemic said:
Correct me if I'm wrong but I think this is the same saga that iPad users went through. The device requires 2 amps to charge correctly, but a standard usb port only offers 500 milliamps or 1/4 of the required dosage. So while I havent tested it myself, it sounds feasible that the nook is charging, however its nowhere near the required amperage to show the charging icon on the device.
Click to expand...
Click to collapse
the NC only has a 1530mah battery, which should not require 2A to charge. my samsung captivate has a 1500mah battery, and charges fine from USB. the NC should be able to charge from USB fine, but it's strange that it only does so very slowly.
I thought the NC had a 4,000mah battery
likearaptor said:
I thought the NC had a 4,000mah battery
Click to expand...
Click to collapse
i saw a replacement nookcolor battery at best buy that said 1530mah, but on nookdevs it does say 4000mah. weird. nooksdevs is probably right. best buy probably mislabeled that battery i saw.
Ben74 said:
i saw a replacement nookcolor battery at best buy that said 1530mah, but on nookdevs it does say 4000mah. weird. nooksdevs is probably right. best buy probably mislabeled that battery i saw.
Click to expand...
Click to collapse
You probably saw a replacement original nook battery. If you saw some of the teardown photos (mine), it's pretty obvious that this battery isn't user-replaceable. Ok, maybe my pictures aren't the best, but take my word for it. That block outlined in black in the fourth photo is the battery and is bigger than your entire captivate
A "Y" shaped USB cable with two male type "A" connectors that is plugged into two USB ports may charge the NC while avoiding the "Not Charging" message. However, since the overcharging / monitoring circuitry is external to the unit it may not be wise. It very well could decrease the lifespan of the battery and without the ability to easily replace it, I wouldn't try it myself.
Hi guys, I accidentally left my charger and USB cable at a friend's house 700 miles away during a visit. She sent it back to me, but it's been a bit over two weeks and I'm tired of being Nookless, especially with all of the new stuff developing (cyanogen on the way? AWWW YEAH!!).
Neither of the two BN stores near my house have replacement charger/cables in stock and it appears that the BN website does not either (not even a price listed, just a pic/description).
What is the cheapest way for me to get some power in this thing? I wouldn't mind charging solely through USB. Is the stock NookColor USB cable any different than a normal micro-usb cable? Can I just order a normal $2 cable from amazon and expect it to charge?
The cable that comes with the NookColor differs from a standard micro usb in a couple of important ways: It has extra pins to deliver a higher charge. OK, I guess by "a couple" I meant "one that I am aware of." Alright, maybe one more: The charger itself is rated at .5A, which is higher than the standard plug for usb chargers.
You might be able to trickle charge from a standard usb. I was able to get some power, but not much.
Here's one more thing to do:
Ask the manager at B&N if she has any extra chargers and cables in the back. Here's why I say this: I had to return my cable yesterday because it wasn't making proper contact with the pins and thus was not properly charging. The manager told me that he has a heap of NookColor plugs and cables in a box because when they send units back to wherever they send them for repair or reconditioning, they are instructed to send only the Nook, and not the cables.
It's worth a try.
Good luck.
It does charge very slowly when connected to the PC...It will charge overnight if not in use..
I have some Nokia cables (from my mobile) with Micro-USB, they are loading the Nook nearly as fast as the original one. Very handy for charging in the car.
I have been charging my nook with only a standard cable since day one. My nook came with a bad cable and at the time was one of the last nooks in my area. I have been calling B&N almost weekly for over a month and they keep saying they will send me a cable but I have not received it yet. I have had no problems charging my Nook overnight. I even emptied the battery once and it still charged fully over night.
A regular microUSB cable will eventually charge the NC, if it's sleeping. No 3-hour quick-charging, though.
Does the slow charging really have to do with the cable?
On high draw devices (e.g. iPhone or Palm Pre) the charger shorts the data pins to signal the capacity for higher current draw. The cable has nothing to do with it.
I have noticed the Nook plug is longer than a standard micro USB plug, but that only means you can't use the Nook cable on another device's micro USB port.
Anybody know the potential problems trying to root with a non-standard Cable?
mageus said:
I have noticed the Nook plug is longer than a standard micro USB plug, but that only means you can't use the Nook cable on another device's micro USB port.
Click to expand...
Click to collapse
Is this confirmed to be true? If so, what allows a non-Nook USB cable to be used with the Nook?
I'm sure the cable itself is different, either by using the data lines as additional power lines for higher current capacity, or perhaps by adding some resistors to pull the data lines to certain voltages so that the Nook can identify when the "right" cable is connected, so that fast-charging can be enabled. I just can't quite grasp the idea that the cable is not physically compatible with other micro-USB devices.
I am able to use the original nook usb cable, my samsung moment usb cable, and others for data purposes, no issues
I have two other devices that also use M-USB for data transfer, and they work just fine.
I picked up a few of these a while back and they work as well:
http://www.newegg.com/Product/Produ...&cm_re=micro_usb_cable-_-12-119-265-_-Product
It seems that you can call B&N support for a new one if you had issues with your original. Not the OP's problem, but Some have had the issue.
Here is a thread about it:
http://bookclubs.barnesandnoble.com...t-to-slide-charger-into-Nook-Color/m-p/809920
nootered said:
I have two other devices that also use M-USB for data transfer, and they work just fine.
I picked up a few of these a while back and they work as well:
http://www.newegg.com/Product/Produ...&cm_re=micro_usb_cable-_-12-119-265-_-Product
Click to expand...
Click to collapse
So the idea is that these could be used only for data and trickle-charging? Even if it's connecting the Nook to its official power-thingy (is there a name for those?)
markiejones said:
So the idea is that these could be used only for data and trickle-charging? Even if it's connecting the Nook to its official power-thingy (is there a name for those?)
Click to expand...
Click to collapse
I am just using it for data transfer and charging with the stock wall unit. As far s using these cables or other USB devices that using the MicroUSB interface would require some type of software driver (USB Host) in order to make that work. As far as I know at least.
manchucka said:
Alright, maybe one more: The charger itself is rated at .5A, which is higher than the standard plug for usb chargers.
Click to expand...
Click to collapse
Actually... .5A is the minimum for all plain jane USB ports.
If I remember right, when I flipped the charger over when I first got the NC, it is rated at 1.9A, which would make sense considering the size of the battery we are charging and at the speed we are charging it at. Hell, my Epic uses a 1A charger and it is only 1500mAh battery vs the NC's 4000 mAh.
danbutter said:
It seems that you can call B&N support for a new one if you had issues with your original. Not the OP's problem, but Some have had the issue.
Here is a thread about it:
]
Wow thanks for that link. From the day I got my Nook I couldn't use the included USB cable to move data, but it would charge like a charm. Now I'm getting a replacement.
Click to expand...
Click to collapse
danbutter said:
It seems that you can call B&N support for a new one if you had issues with your original. Not the OP's problem, but Some have had the issue.
Here is a thread about it:
http://bookclubs.barnesandnoble.com...t-to-slide-charger-into-Nook-Color/m-p/809920
Click to expand...
Click to collapse
True but.... I have been calling for well over a month and first they could not ship me one because I bought it at Best Buy and they did not have the warranty info yet from Best Buy. I finally got past that and since the week after Christmas they have been shipping me one each time I call. I have yet to receive one. I am going on 2 months now trying to get the cable shipped to me.
TainT said:
Anybody know the potential problems trying to root with a non-standard Cable?
Click to expand...
Click to collapse
I don't think there are any.. I do all my ADB work using a "non-standard cable". The usb cable that came with my nook wont let ADB work right. When I type ADB devices with my factory cable I get the serial number but instead of device it shows suspended or something like that.
http://www.rdi.us/USBCC.pdf
Here is a link for a Hi - Power USB Car Charger. It's 2100mA and can run and charge an Android Tablet or iPad at the same time. Also the microUSB cable they offer, shows "Charging ( AC) ” When plugged into my Captivate. Most just showed "Charging ( USB) ".
Sent from my Samsung Captivate with Perception 10.3, Firebird2 v0.8 #77 Kernel, Firmware 2.2.1, Modem T959TLJL3 using XDA App
.5A is nothing. Most phone chargers now are rated at 1A with ones for tablets going above 2 as someone else mentioned. Most BT headset chargers are rated at .2-.5A in comparison. Some GPS units have charges rated over 1.5A. My Dash unit had a 2A.
And if I'm not mistaken, if you're connected to a computer you will only get a tricklish charge as it's limited to .2 or .25A (I believe).
In regards to actual cables, any microUSB cable will work. I've used stock ones from Samsung and Palm phones as well as cheap 50 cent ones from Meritline. And if the Nook one is actually longer? Why wouldn' it work in something else? The cable will just stick out further.
manchucka said:
The cable that comes with the NookColor differs from a standard micro usb in a couple of important ways: It has extra pins to deliver a higher charge. OK, I guess by "a couple" I meant "one that I am aware of." Alright, maybe one more: The charger itself is rated at .5A, which is higher than the standard plug for usb chargers.
You might be able to trickle charge from a standard usb. I was able to get some power, but not much.
Click to expand...
Click to collapse
I was surprised to see that, upon trying to charge the Nook Color for the first time, that the microUSB connector is very brittle to say the least. I was having a hard time even getting the nook end of the cable to be fully connected, because I was afraid I might break something. It eventually would go in with a violent SNAP sound, but it was still scary.
The next time I needed to transfer some files/charge, I tried one of my generic monoprice microUSB cables and didn't have the same issues. The connection was made with no fuss, and everything works the same. This may seem like an obvious thing to do, but, in case there's someone out there that hasn't tried a different cable and had the same concerns as me, it's a better route.
A regular microUSB cable doesn't have the power connectors on both sides (or something to that effect). I read a B&N support post over on their forums and someone mentioned trying another microUSB cable. Support warned they would only get a trickle charge without the actual Nook USB charger.
Had the same problem, almost like fishing around with the stock nook cable to get it to seat. My motorola works a little better, but still seems like a quality issue with the alignment of the micro USB on the bottom of my nook.
I think the nook wall to USB charger is 2 amp which is more then the standard 1 amp chargers that most phones and devices come with.
Does the stock cable have additional connections to light up the status light at the tip? A slow charge is better than possible snapping something off the Nook itself in my opinion.
No, the secondary power lines on the connector aren't just to light the status light though I'm sure that's part of the power draw. It'll just take you twice as long to charge. If you're an overnight charger, that might be alright for you.
I see. I also just checked the the ac adapter. It puts out 1.9A--way more than a standard USB charger. Maybe that has somethng to do with the special cable as well.
Sent from my SCH-I500
I also had some quality issue with the default cable. Changed the cable and it was fixed.
Mine was bought around Christmas, have they fixed that issue with the latest versions?
Don't think so, because I bought mine earlier this week. However, the USB connection with the factory cable seems to have been magically fixed. I have to be really careful, but the B&N cable fits better now. Strange.
Sent from my SCH-I500
Hi!
I just got my Nook and when I was about to charge it I realised I've lost my adapter for US plugs. Charging from the USB port on my computer is ridiculously slow, even with the Nook's USB/charger cable, and plugging it into my HTC charger makes that charger disconcertingly hot.
I reckon my computer's USB ports should be able to manage to provide at least a couple of amps, but, if I've understood things correctly, it won't provide anywhere near that much to the Nook unless the Nook asks for it.
So, is there any way to make the Nook ask for more juice?
Thanks in advance!
-- P
Animec said:
Hi!
I just got my Nook and when I was about to charge it I realised I've lost my adapter for US plugs. Charging from the USB port on my computer is ridiculously slow, even with the Nook's USB/charger cable, and plugging it into my HTC charger makes that charger disconcertingly hot.
I reckon my computer's USB ports should be able to manage to provide at least a couple of amps, but, if I've understood things correctly, it won't provide anywhere near that much to the Nook unless the Nook asks for it.
So, is there any way to make the Nook ask for more juice?
Thanks in advance!
-- P
Click to expand...
Click to collapse
USB ports are hardware limited to 500mA. It is part of the specification. Also most USB cables can't handle more current than this without damage. The Nook Color has a special cable with extra pins to handle the ~1900mA that it's charger puts out. The Nook doesn't 'Ask' for more juice, it's charger is capable of more current than a standard USB port, and the cable has the extra pins that carry the extra current. B&N did make it so that you could also charge it via standard USB-albeit more slowly. Your HTC charger is getting hot because it wasn't built to self-limit current to prevent damage to itself.
Ah, my bad. I read somewhere that USB devices can start out at 100 mA and then ask for more, but I don't know how I figured it could be as high as several amps >_< thanks for the clarification
mrmark93 said:
USB ports are hardware limited to 500mA. It is part of the specification. Also most USB cables can't handle more current than this without damage. The Nook Color has a special cable with extra pins to handle the ~1900mA that it's charger puts out. The Nook doesn't 'Ask' for more juice, it's charger is capable of more current than a standard USB port, and the cable has the extra pins that carry the extra current. B&N did make it so that you could also charge it via standard USB-albeit more slowly. Your HTC charger is getting hot because it wasn't built to self-limit current to prevent damage to itself.
Click to expand...
Click to collapse
Not really.. most laptop usb ports can handle ~800/900ma just fine. i.e. with my evo, it normally charges at 500ma using a standard microusb cable.. but if I use a special charge-only cable (middle pins are shorted out), then it charges at ~800ma..
-mark
diomark said:
Not really.. most laptop usb ports can handle ~800/900ma just fine. i.e. with my evo, it normally charges at 500ma using a standard microusb cable.. but if I use a special charge-only cable (middle pins are shorted out), then it charges at ~800ma..
-mark
Click to expand...
Click to collapse
Not surprising:
http://www.maxim-ic.com/app-notes/index.mvp/id/3241
What Your Mom Didn't Tell You About USB
With any standard, it's interesting to see how actual practice diverges from the printed spec or how undefined parts of the spec take shape. Though USB is, with little doubt, one of the best thought out, reliable, and useful standards efforts in quite some time, it has not been immune to the impact of the real world. Some observed USB characteristics that may not be obvious, yet can influence power designs, are:
USB ports do NOT limit current. Though the USB spec provides details about how much current a USB port must supply, there are mile-wide limits on how much it might supply. Though the upper limit specifies that the current never exceed 5A, but a wise designer should not rely on that. In any case, a USB port can never be counted on to limit its output current to 500mA, or any amount near that. In fact, output current from a port often exceeds several Amps since multi-port systems (like PCs) frequently have only one protection device for all ports in the system. The protection device is set above the TOTAL power rating of all the ports. So a four-port system may supply over 2A from one port if the other ports are not loaded. Furthermore, while some PCs use 10-20% accurate IC-based protection, other will use much less accurate poly-fuses (fuses that reset themselves) that will not trip until the load is 100% or more above the rating.
USB Ports rarely (never) turn off power: The USB spec is not specific about this, but it is sometimes believed that USB power may be disconnected as a result of failed enumeration, or other software or firmware problems. In actual practice, no USB host shuts off USB power for anything other that an electrical fault (like a short). There may an exception to this statement, but I have yet to see it. Notebook and motherboard makers are barely willing to pay for fault protection, let alone smart power switching. So no matter what dialog takes place (or does not take place) between a USB peripheral and host, 5V (at either 500mA or 100mA, or even maybe 2A or more) will be available. This is born out by the appearance in the market of USB powered reading lights, coffee mug warmers, and other similar items that have no communication capability. They may not be "compliant," but they do function.
Click to expand...
Click to collapse
I'll echo the fact that while USB as a spec isn't limited though sometimes a computer manufacturers will place a limit on it. MacBook Airs won't put out more than 500ish, for instance. The reason for that, I believe, is because Apple wanted to keep the power brick as small as possible (it's significantly smaller than the MacBook Pro's), which meant that the maximum wattage passing through the brick was limited. Since Apple didn't want the MBA to use more power than it could pull through the cord, it limited the power output of the USB ports. I've never needed more than 500 before I got the NC, so I never really cared (and I still don't).
But it is a thing.
Animec said:
Not surprising:
http://www.maxim-ic.com/app-notes/index.mvp/id/3241
Click to expand...
Click to collapse
And, for example, some motherboards have a feature that is a perfect example of bending the standards.
http://www.gigabyte.com/microsite/185/on-off-charge.htm
http://semiaccurate.com/2010/04/23/gigabyte-launches-charge-apple-products/
So, the HTC charger charged it from non-booting to full (ish) charge in 3 - 4 hours, and this time it didn't feel particularly hot. Not sure how or why, but this is certainly a relief
Why not just get a new adapter, they're not expensive.
Sent from my NookColor