Related
Hi,
I just stuck here, cause I found a thread about fast usb charging. But there is no answers or solutions.
I have many htc devices. It seems that some of them has a problem with 3rd party usb chargers.
My most used device is Universal. It suck a lot of power. THis one doesn't enable usb charging at all, until you put it in sleep mode before pluging the charger.
Anyway, the same issue for Kaiser too.
The problem is, that it doesn't matter how much current is the charger able to deliver. They just use some kind of recognition of original chargers.
What I already measured: Original charger and universal running => takes 1200mA. 3rd party charger or my 5A PSU => Universal/Kaiser sucks just 500mA.
This is fast/slow charge. I found here discussion about 4 and 5 pins shorted??
But WTF which 4 & 5 pin?
http://www.tracyandmatt.co.uk/blogs/index.php/2006/09/10/htc_hermes_usb_connector_pin_config
According to this pinout. It would be 2 GND of Audio side? I'm not sure that original charger use extUSB audio side to charge...? It also could be D & A pins, but I'm afraid to connect 5V to Data- pin.
Anyway, someone here have to know it.
If not, in a few days I'll try all possible combinations and post the results.
Thanks
Shef
I'd also be interested to know about this. When I charge my TYTN II via USB, it takes much longer to charge than if I charge it via the mains charger (I prefer USB since I travel a lot and it's one less charger I need to carry around).
Better still, is it possible to buy a USB cable that will charge at the same rate as the mains charger rather than messing with a USB cable with the associated risks?
Best,
Gary.
Shef said:
Hi,
What I already measured: Original charger and universal running => takes 1200mA. 3rd party charger or my 5A PSU => Universal/Kaiser sucks just 500mA.
This is fast/slow charge. I found here discussion about 4 and 5 pins shorted??
But WTF which 4 & 5 pin?
http://www.tracyandmatt.co.uk/blogs/index.php/2006/09/10/htc_hermes_usb_connector_pin_config
Click to expand...
Click to collapse
a usb port only supplies 500ma, while the wall charger does 1200ma as the OP has measured (although it says 1A at the back of the charger). changing a cable is not gonna superpower up your usb port.
unless maybe you get hold of a forked USB cable, like the one that Seagate Free Agent drives come supplied with... you know, 1 mini USB splitting halfway down to two normal USB plugs.
Worth experimenting with, do you think?
wyrm said:
unless maybe you get hold of a forked USB cable, like the one that Seagate Free Agent drives come supplied with... you know, 1 mini USB splitting halfway down to two normal USB plugs.
Worth experimenting with, do you think?
Click to expand...
Click to collapse
good call.......with a little googling i came up with this
http://www.universaluk.com/acatalog...2_x_Type_A_to_mini_B__USB_2_0__1m__Lindy.html
tried ebay, my brief search came up with lots of unrelated results, so i gave up
I got one of those leads, came with my portable 2.5" hard drive. Just tried the lead on my Tytn 2 and it does charge almost as fast as the mains plug
Success
Ok, so, I tried to experiment.
Here you go.
Usb simple cable 480ma charge.
The same result with Motorola charger.
Motorola charger pins A and B short circuit - 890mA.
That's much better, althrough I suppose it can suck more current then 890mA, but it's significantly better.
THere is also pins data+ and data- short circuited (I don't know if it has effect, but I can't disconnect it in this connector).
Apparently NC (not connected) pin on our pinout schematics definitely is connected.
With % of charged battery it suck less and less current....I suppose it's usual, this should be even driven by ROM.
So, update your cables
It works even with car charger, so no more charger problems...
Shef
Just to be clear - you took a Motorola USB cable and shorted pins A and B (which are which by the way?) and it provides a decent current....
How do you short the pins? I've looked in the end of cable and I can hardly see the pins, let alone short them! What's the trick here or have I missed something?
Thanks,
Gary.
Shef said:
Ok, so, I tried to experiment.
Here you go.
Usb simple cable 480ma charge.
The same result with Motorola charger.
Motorola charger pins A and B short circuit - 890mA.
That's much better, althrough I suppose it can suck more current then 890mA, but it's significantly better.
THere is also pins data+ and data- short circuited (I don't know if it has effect, but I can't disconnect it in this connector).
Apparently NC (not connected) pin on our pinout schematics definitely is connected.
With % of charged battery it suck less and less current....I suppose it's usual, this should be even driven by ROM.
So, update your cables
It works even with car charger, so no more charger problems...
Shef
Click to expand...
Click to collapse
Also interested in how to short the pins. I use Navizon, bluetooth HSDPA tethering, and iGuidance while on the ambulance and even my iGo 3A max rated charger can barely keep up because the tilt wont accept all of the available current.
So have anyone found a way to fast charge our ppc through usb??
Yes, that is correct. Short pins 4 & 5 (4 is normally NC) to enable fast-charging. If you do it correctly, the phone shouldn't pick up tethering, and therefore should not say "PC Connected" or the like..
The TracyAndMatt pinout is wrongly numbered. The pin assignments are correct, but the number/letter scheme they used is incorrect. True ExtUSB pinout translation to their pinout is as follows:
T & M Real ExtUSB
-------------------------------
Pins E D C B A = 1 2 3 4 5
Pins 1 2 3 4 5 6 = 6 7 8 9 10 11
The way I remember is that the corner opposite the angled one is where pin 1 starts (where E is on the T&M pinout) - and they go like most IEC-standard connectors, in a clock-like circular numbering scheme.
Here's a better pinout: http://pinouts.ru/PDA/htc_extUSB_pinout.shtml
Hope this helps!
--W5i2
its the milliamps that is the problem even doubling up with a y splitter does not do much Find a charger with the most milliamps for a faster charge 1.2 amps works best and as far as i know no usb port puts out that much even if they are wired in a series. Many try to sell lower amp chargers they dont even know about it at att. if the screen is off they will charge but not well these phones are energy hogs. I must have at least twenty chargers and messed around with them... the original or one of highest amperage works for me.
Check winhlp.com/node/855 for the answer.
htc_battery_trout.c said:
/* A9 reports USB charging when helf AC cable in and China AC charger. */
/* Work arround: notify userspace AC charging first,
and notify USB charging again when receiving usb connected notificaiton from usb driver. *
Click to expand...
Click to collapse
I find this annoying. I can't tell if my wall charger is fast charging or not because the G1 always says "AC"
hgmichna said:
Check winhlp.com/node/855 for the answer.
Click to expand...
Click to collapse
That is not going to help HTC owners.
HTC charging cable
kiss_se said:
That is not going to help HTC owners.
Click to expand...
Click to collapse
http://winhlp.com/node/855 was explicitly written for HTC smartphone owners.
hgmichna said:
[...] was explicitly written for HTC smartphone owners.
Click to expand...
Click to collapse
Sorry, I meant to say: That is not going to help extusb owners.
hgmichna said:
Check winhlp.com/node/855 for the answer.
Click to expand...
Click to collapse
Is it possible to get one of the 'fast charge' enabled USB cables on eBay or elsewhere? I am not keen on doing the mod described.
What is the maximum mAh recommended for HTC devices? Is it still 1.2 A or more?
zurpher said:
Is it possible to get one of the 'fast charge' enabled USB cables on eBay or elsewhere? I am not keen on doing the mod described.
Click to expand...
Click to collapse
Check http://winhlp.com/node/855#qaes for the only buyable solution I know, besides compatible chargers. Your best bet is probably the original HTC charger, available for roughly $10.
zurpher said:
What is the maximum mAh recommended for HTC devices? Is it still 1.2 A or more?
Click to expand...
Click to collapse
There can be no recommended maximum mAh. There can only be a required current, which differs from device to device. Check Ohm's Law. The device determines how much current it draws. If the charger cannot deliver that current, then the charging process can fail in various ways, all undesirable.
hgmichna said:
Check http://winhlp.com/node/855#qaes for the only buyable solution I know, besides compatible chargers. Your best bet is probably the original HTC charger, available for roughly $10.
There can be no recommended maximum mAh. There can only be a required current, which differs from device to device. Check Ohm's Law. The device determines how much current it draws. If the charger cannot deliver that current, then the charging process can fail in various ways, all undesirable.
Click to expand...
Click to collapse
Could the USB Switching 2A Power Charger Adapter Convertor Plug be similar in function to the one that you've linked?
zurpher said:
Could the USB Switching 2A Power Charger Adapter Convertor Plug be similar in function to the one that you've linked?
Click to expand...
Click to collapse
I don't know, but probably not. Apple used to use a different signalling scheme involving resistors.
Hello,
I have been a victim of stolen bag recently.
Inside, among other things, was my original X1 wall charger, which is lost now.
At home I have a couple of other usb chargers but although they are 5V the Amber are different.
I know they work, but I prefer to use one closest to the original output for the wellness of battery.
(I slightly remember that the genuine charger was less than 1A)
Could someone pls check the original power adapter and tell me which exactly is the output?
(thanks in advance)
nek4d said:
Hello,
I have been a victim of stolen bag recently.
Inside, among other things, was my original X1 wall charger, which is lost now.
At home I have a couple of other usb chargers but although they are 5V the Amber are different.
I know they work, but I prefer to use one closest to the original output for the wellness of battery.
(I slightly remember that the genuine charger was less than 1A)
Could someone pls check the original power adapter and tell me which exactly is the output?
(thanks in advance)
Click to expand...
Click to collapse
700ma. you don't have to keep close to the charger's specs other than the 5V. ampre rating is merely affects the speed of charging.
Just like how u charge from ur computer's usb port, you get maximum of 500mA /port anyway.
alvino said:
700ma. you don't have to keep close to the charger's specs other than the 5V. ampre rating is merely affects the speed of charging.
Just like how u charge from ur computer's usb port, you get maximum of 500mA /port anyway.
Click to expand...
Click to collapse
Thank you alvino!
Further to this question, can anyone tell me if a Blackberry In-Car Charger is OK with the X1?
Any usb port charger will work with your phone. Although, you might not wanna let your battery drain completely, one of the cells may fail and you'll get the dreaded "On button red light" syndrome... which I did. The main solution to that is to replace the battery. Considering the difficulties I've had, I'm sad I didn't pick a C905 instead
as long as it's 5volt it can be 1MEGA amp
amps are drawn not pushed
ohms law is
A = volt / Resistance
the device will draw as much as it require nothing more
It works just fine with my Zune charger, which is 5v 1.5A.
I bought what i thought were a couple higher quality universal chargers. They charge my razr fast but won't charge my nexus 7 at all. I have one of the chargers pulled apart but before I do any soldering I want to make sure -- if I cross the 2 data points will it work?
Well I couldn't wait 10 minutes so I tried. Answer: no. Wtf?
Can anyone tell me how to hack these chargers to make them work? Is there a resistor I need to remove?
Isn't it more likely to be a software thing?
With my samsung Tab 7.7 i couldn't charge it using my ipad charger until a Dev modded the software on the tablet.
are they 2Amp chargers? most universal chargers are only 1Amp
Well whatever the problem is, I want to charge my tablet in more than one place, I want to charge it faster than the 16 hours generic chargers are taking, and I don't want to pay $30 for OEM chargers.
If your tablet is taking 16 hours to fully charge, return it. I can drain mine after heavy use of the day and its still fully charged in under 6 hours.
Sent from my Nexus 7 using xda app-developers app
@soldeus: There's nothing wrong with my tablet. The OEM charger works fine and some of my generic chargers work, they just don't have the current. (See below)
@vivan: They are 1A chargers, but they should still work. They don't charge at all. The 500ma Blackberry charger I'm using here at work will charge it in about 8 hours.
Ironically the move to almost-universal micro usb chargers has made the market for them even worse. Now, instead of having to buy a new charger every time you buy a new phone, you have to buy a dozen different chargers till you find one that actually works. Like I said, I didn't try to cheap out. I got a high quality charger.
qoncept said:
@soldeus: There's nothing wrong with my tablet. The OEM charger works fine and some of my generic chargers work, they just don't have the current. (See below)
@vivan: They are 1A chargers, but they should still work. They don't charge at all. The 500ma Blackberry charger I'm using here at work will charge it in about 8 hours.
Ironically the move to almost-universal micro usb chargers has made the market for them even worse. Now, instead of having to buy a new charger every time you buy a new phone, you have to buy a dozen different chargers till you find one that actually works. Like I said, I didn't try to cheap out. I got a high quality charger.
Click to expand...
Click to collapse
The OEM charger is 2A for a reason. Because the tablet uses more power, it needs more current to charge at a fast pace.
Your generic 1A chargers are probably just enough to keep the tablet powered on, without draining (or charging) the battery.
If you can find a 2A universal charger, it should work just like the OEM one.
reiji said:
The OEM charger is 2A for a reason. Because the tablet uses more power, it needs more current to charge at a fast pace.
Your generic 1A chargers are probably just enough to keep the tablet powered on, without draining (or charging) the battery.
If you can find a 2A universal charger, it should work just like the OEM one.
Click to expand...
Click to collapse
No, my 1A chargers are doing NOTHING at all. I plug it in and the charging icon doesn't come on. Reviews have tested these chargers at about 950ma and as I said, my 500ma Blackberry charger isn't too bad.. It's not lack of power, it's something else.
My guess is it has whatever resistor it needs to make it an "ipad" charger. And the vast majority of 2A chargers will, too.
So.. back to my original question: what do I need to do to make this charger charge my tablet? I KNOW it's possible. I just need to find the guy who can tell me how.
I also need a charger for my car, my usb power adapter in the car does not work, need to know what car charger will work as this tablet is supposed to be my car stereo replacement, sucks having to bring your stereo in to charge it and hope it lasts till you get done work
I bought the Scosche dual 10 Watt car charger, isn't here yet though. It does say it wont charge the Samsung tablets, maybe due to the proprietary cord because apparently there is a cord that works with them. It's not a specific ipad charger and does say it works with Android devices and tablets.
On a side note, what's the best way to determine what your N7 is actually charging at?
Both of my generic chargers won't work either, a 2.1A generic iPad charger, and a 1A standard USB charger. Considering it WILL charge off a 500ma USB port, it's not a current/amperage issue, it's a software/proprietary hardware issue.
b22ri22an said:
I also need a charger for my car, my usb power adapter in the car does not work, need to know what car charger will work as this tablet is supposed to be my car stereo replacement, sucks having to bring your stereo in to charge it and hope it lasts till you get done work
Click to expand...
Click to collapse
I use a verizon branded car charger to charge my N7 but I think they charge $30 for it at the vzw store.
I suggest you read this page as it may have some info to help you modify your charger:
http://www.ladyada.net/make/mintyboost/icharge.html
neilrl79 said:
I use a verizon branded car charger to charge my N7 but I think they charge $30 for it at the vzw store.
Click to expand...
Click to collapse
the cost isn't so much the issue, its the actually working part. do they have one with an angled micro usb so i can mount the tablet in the car properly or preferably a usb adapter one where i can use my own cord
For $30 you could order a handful of different ones on ebay or monoprice and find something that works. But I want a dual charger.
grim82 said:
I suggest you read this page as it may have some info to help you modify your charger:
http://www.ladyada.net/make/mintyboost/icharge.html
Click to expand...
Click to collapse
does that mean a usb adapter that is certified to work with an ipad will work for my n7
b22ri22an said:
does that mean a usb adapter that is certified to work with an ipad will work for my n7
Click to expand...
Click to collapse
I won't say 100% but I would bet the probability is very high. For the 1A charging they all seemed to play the same game with the voltage on the data lines. Not sure you'll get 2A but you'll at least get 1A.
Edit... maybe not, see this thread:
http://forum.xda-developers.com/showthread.php?t=1781680
I have a philips as351 audio dock that pushes 2A out of the micro-usb charger and the usb port on the back and neither will charge the N7. Bummer because it looks so nice on the dock to
Hey Everyone,
It's become kinda obvious now that i really need to change out all my old 1A chargers for 2A chargers now.
The one that comes with the phone is nice - if I didn't need the adapter to go with it. Now it's huge and chunk.
I'd like a pretty small charger, like the wonderful 1A TC U260 I got with my mytouch 4g.
I'm considering the following:
PowerGen Dual USB 2A 10W Car charger:
http://www.amzn.com/gp/product/B006...=1789&creative=390957&creativeASIN=B006SU0SX0
PowerGen Dual Port Travel Wall Charger
http://www.amazon.com/PowerGen-Travel-Charger-Samsung-included/dp/B0073FE1F0/ref=cm_cr_dp_asin_lnk
Griffin GC23139 PowerJolt Dual car charger
http://www.amazon.com/Griffin-GC231...e=UTF8&qid=1349479987&sr=1-1&keywords=GC23139
(I really liked their dual mini which I used for a long time)
Any recommendations?
That first wall charger looks like something I'd buy. The charger and adapter I got from handtec is just so huge and ugly
Sent from my SAMSUNG-SGH-I717 using Tapatalk 2
How about the old HP touchpad chargers. IIRC those are 2a chargers. And they are cheap
Sent from my SAMSUNG-SGH-I717 using xda app-developers app
I bought this one. Have not recieved it yet but looks good on paper.
http://pages.ebay.com/link/?nav=item.view&id=170905466556
Sent from my GT-N7100 using xda app-developers app
This is kinda related to this thread
Can I use another USB cable with the original note 2 charger and still get 2A from it? I feel like the USB cables for my sgs2 fit better in my note 2 than the one that comes with it.
none of those car chargers will work if you plan on using the phone
ChodTheWacko said:
Hey Everyone,
It's become kinda obvious now that i really need to change out all my old 1A chargers for 2A chargers now.
The one that comes with the phone is nice - if I didn't need the adapter to go with it. Now it's huge and chunk.
I'd like a pretty small charger, like the wonderful 1A TC U260 I got with my mytouch 4g.
I'm considering the following:
PowerGen Dual USB 2A 10W Car charger:
PowerGen Dual Port Travel Wall Charger
Griffin GC23139 PowerJolt Dual car charger
(I really liked their dual mini which I used for a long time)
Any recommendations?
Click to expand...
Click to collapse
I have done a lot of research on this. If it is compatible with ANY apple products then it will not charge with your cable due to the USB standard not being the same. You will have to either mod the product or the cable to get the full 2a charge. Plus I believe the Powergen and the griffin are only 2a total output so if you are charging 2 devices it will only be 1a and 1a ports. You need to look for a 4a total output. I have yet to find any that work. If anyone can find one please let me know. Charging with a 1a charge and using a GPS you will lose power as it does not charge fast enough. You need a full 2a. p.s. had to remove the outside links because I havent posted 10x yet.
yankees177 said:
If it is compatible with ANY apple products then it will not charge with your cable due to the USB standard not being the same.
Click to expand...
Click to collapse
This is not quite true.
I believe Apple only has high speed charging if you don't use an 'apple' USB port, similar to how you don't get high speed charging if you use a USB data cable versus a charging cable.
To be 100% I don't understand how it works exactly.
I can tell you, however, the following:
1) My Griffin charger happily charged my galaxy note even going full blast (GPS/bluetooth/screen on), and I bought some iphone chargers to help my friends out, and they charged their phones (slowly) with my charger too.
2) The powergen 10W charger I put above also happily (and quickly) charges my Note II going full blast.
It actually has a different 'Apple' vs 'non apple' USB port. Non-apple stuff may not charge in the apple slot, but that's not a big deal to me. I have only one phone. My iphone friends are usually the ones running out of power anyway, so it's kind of nice one side is applely.
- Frank
to the OP, try this:
http://www.amzn.com/Mediabridge-Hig...&qid=1351550361&sr=1-12&keywords=powergen+3.1
then get a charging cable:
http://www.amzn.com/Naztech-Micro-U...1351550441&sr=1-2&keywords=usb+charging+cable
or if you have an extra cable lying around, mod it. See this post to get a better idea:
http://forum.xda-developers.com/showpost.php?p=22546114&postcount=1
Thread linked for reference:
http://forum.xda-developers.com/showthread.php?t=1686971
I have many 2a carchargers that worked great with a gs3 even an iPad that won't provide enough juice to the note to actually charge it while doing intensive tasks like mhl out in the car.
if anyone finds a car charger that actually works post it out we need a fast charge custom kernel.
I have a thread in the general note Sprint forum thatwe are discussing this as well and it seems no charger will work but an adapter I'm waiting on May
what about this?
http://www.amazon.com/gp/product/B00845NI8E/ref=oh_details_o00_s00_i00
dual 2A port car charger and comes with a Free MicroUSB cable that can handle faster charging. I ordered on so we'll see
peekeesh said:
to the OP, try this:
http://www.amzn.com/Mediabridge-Hig...&qid=1351550361&sr=1-12&keywords=powergen+3.1
This appears, from the reviews, to be an "apple"ish charger and doesn't work well with android devices.
Click to expand...
Click to collapse
Would this work?
http://pages.ebay.com/link/?nav=item.view&id=150928933202
yankees177 said:
I have done a lot of research on this. If it is compatible with ANY apple products then it will not charge with your cable due to the USB standard not being the same. You will have to either mod the product or the cable to get the full 2a charge. Plus I believe the Powergen and the griffin are only 2a total output so if you are charging 2 devices it will only be 1a and 1a ports. You need to look for a 4a total output. I have yet to find any that work. If anyone can find one please let me know. Charging with a 1a charge and using a GPS you will lose power as it does not charge fast enough. You need a full 2a. p.s. had to remove the outside links because I havent posted 10x yet.
Click to expand...
Click to collapse
Im looking for 2A on each port too wall charger and only finds these.
Car charger:
http://www.amazon.com/Qmadix-QM-DMCH4-2-AP-WH-Twin-Tablet-Charging/dp/B008AGMO7S/ref=pd_cp_e_1
Wall charger, but thinks it divides 4A on each port?
http://www.alibaba.com/product-gs/650723185/UL_Approval_4A_USB_Charger_For.html
Wall charger:
http://www.thinkgeek.com/product/efbe/#tabs
Why the heck are all for ipads, iphone and no EU plug.
I got an amazon branded 2A single usb charger about 6 months ago for another phone. It charges my Note2 quick. Sorry no links...
Sent from my SGH-T889 using Tapatalk 2
What about this please? Need input.
i.Sound Portable Charger
Has 16,000 mah
Input: 12V 1A
Output: ''5V 2.1A on each connector 2.5 A together''
I charge a number of things on here...
A friend has me a bit confused saying this could damage the charging mechanisms of the phone cause it has too much voltage?
Any input please?
Thanks
One Car Charger that works
Hello,
Whether a charger works or not depends on what DCP (Direct Charge Port) modes it supports.
I suspect the GN2 uses Shorted DCP, where the USB data lines (D+ and D-) are shorted. Apple chargers sense 2.4Vdc on these lines to allow the charger to ramp to full current. Asus and some Sammy TABs use 1.2Vdc to enable full current. This is to distinguish real USB ports from chargers, and to "encourage" you to use the manufacturer's provided charger.
It would be nice if someone can confirm what DCP mode the GN2 actually uses. Not that the charger manufacturer's publish what modes they support.... However, the charger IC manufacturer's (TI, Maxim) are beginning to get good at DCP autodetection which is going to make it much easier for us consumers.
As far as finding chargers that work,
I bought a 2.1A dual car charger at Walmart, model "i-xt" that works well with the GN2 and is listed as "on AC" when connected. Implying full current.
Cheers,
-Plaz
---------- Post added at 12:43 PM ---------- Previous post was at 12:31 PM ----------
rockky said:
i.Sound Portable Charger
Has 16,000 mah
Input: 12V 1A
Output: ''5V 2.1A on each connector 2.5 A together''
I charge a number of things on here...
A friend has me a bit confused saying this could damage the charging mechanisms of the phone cause it has too much voltage?
Any input please?
Thanks
Click to expand...
Click to collapse
You don't have to worry about your phone being damaged. Phones have built-in protection for over-voltage and over current. 5Vdc is proper voltage for USB devices anyway (Output 5V, as listed in the specs). The catch is if the phone allows full current charging. That depends on the DCP mode of the charger. I'm not positive what mode the GN2 truly supports. If you already have the charger, you can determine if full current is being used by checking under settings -> battery while connected to the charger. If you see the "On AC" verbiage, the phone is in full current mode. If not, the charger is limiting to 500ma and acts like a standard USB port. You phone will still charge, but it will take longer.
Clear as mud?
Cheers,
-Plaz
http://www.amazon.co.uk/dp/B0044E7MNG/ref=cm_sw_r_an_am_ap_am_gb?ie=UTF8
Would this work?
Sent from my GT-N7105 using Tapatalk 2
Thanks
QUOTE=Plazmid;33523324]Hello,
Whether a charger works or not depends on what DCP (Direct Charge Port) modes it supports.
I suspect the GN2 uses Shorted DCP, where the USB data lines (D+ and D-) are shorted. Apple chargers sense 2.4Vdc on these lines to allow the charger to ramp to full current. Asus and some Sammy TABs use 1.2Vdc to enable full current. This is to distinguish real USB ports from chargers, and to "encourage" you to use the manufacturer's provided charger.
It would be nice if someone can confirm what DCP mode the GN2 actually uses. Not that the charger manufacturer's publish what modes they support.... However, the charger IC manufacturer's (TI, Maxim) are beginning to get good at DCP autodetection which is going to make it much easier for us consumers.
As far as finding chargers that work,
I bought a 2.1A dual car charger at Walmart, model "i-xt" that works well with the GN2 and is listed as "on AC" when connected. Implying full current.
Cheers,
-Plaz
---------- Post added at 12:43 PM ---------- Previous post was at 12:31 PM ----------
You don't have to worry about your phone being damaged. Phones have built-in protection for over-voltage and over current. 5Vdc is proper voltage for USB devices anyway (Output 5V, as listed in the specs). The catch is if the phone allows full current charging. That depends on the DCP mode of the charger. I'm not positive what mode the GN2 truly supports. If you already have the charger, you can determine if full current is being used by checking under settings -> battery while connected to the charger. If you see the "On AC" verbiage, the phone is in full current mode. If not, the charger is limiting to 500ma and acts like a standard USB port. You phone will still charge, but it will take longer.
Clear as mud?
Cheers,
-Plaz[/QUOTE]
I bought this:
http://www.amazon.com/gp/product/B005AWO8V0/
It's 2A and works great. I like that the cord is attached, so no losing a USB cable or anything. Also has an integrated USB for other devices.
Plazmid said:
Hello,
Whether a charger works or not depends on what DCP (Direct Charge Port) modes it supports.
I suspect the GN2 uses Shorted DCP, where the USB data lines (D+ and D-) are shorted. Apple chargers sense 2.4Vdc on these lines to allow the charger to ramp to full current. Asus and some Sammy TABs use 1.2Vdc to enable full current. This is to distinguish real USB ports from chargers, and to "encourage" you to use the manufacturer's provided charger.
It would be nice if someone can confirm what DCP mode the GN2 actually uses. Not that the charger manufacturer's publish what modes they support.... However, the charger IC manufacturer's (TI, Maxim) are beginning to get good at DCP autodetection which is going to make it much easier for us consumers.
As far as finding chargers that work,
I bought a 2.1A dual car charger at Walmart, model "i-xt" that works well with the GN2 and is listed as "on AC" when connected. Implying full current.
Cheers,
-Plaz
---------- Post added at 12:43 PM ---------- Previous post was at 12:31 PM ----------
You don't have to worry about your phone being damaged. Phones have built-in protection for over-voltage and over current. 5Vdc is proper voltage for USB devices anyway (Output 5V, as listed in the specs). The catch is if the phone allows full current charging. That depends on the DCP mode of the charger. I'm not positive what mode the GN2 truly supports. If you already have the charger, you can determine if full current is being used by checking under settings -> battery while connected to the charger. If you see the "On AC" verbiage, the phone is in full current mode. If not, the charger is limiting to 500ma and acts like a standard USB port. You phone will still charge, but it will take longer.
Clear as mud?
Cheers,
-Plaz
Click to expand...
Click to collapse
So I understand the shorting D+/D- internally or via charging cable to enable "AC" charging. I understand that Apple and apparently Sammy/Asus use voltage on those lines to signal the requirement for full current. Here's my question: if my Note2 is connected to brand X charger and it says AC charging in the settings under battery, does that mean I am theoretically pulling the max current of that brand X charger. This of course assumes the battery is empty enough, temperatures of the battery and charger are low enough, etc...
What I'm getting at is does having a shorted charger or cable with an android on an iCharger give us full iPower? Gawd that sounds horrible doesn't it! :silly: Or, if you're getting "AC" from the iCharger is it really only 1.1A or 1.6A (just tossing those numbers out there) vice the 2.1A it would be charging an iPad at?
Hi,
Does anyone know why it is such a god damn crapshoot for charging speeds on the galaxy note 2 (or any samsung device for that matter).'
You buy a charger rated for 2amps and you never know what it will give you.
You buy a USB micro cable and get anywhere between 0.4amps and 1.6amps.
What is the criteria that the phone is using to determine how many amps to pull from the charger? How does it even know what gauge of wire it is? Is there some sort of resistance check?
I have a Galaxy Note 10.1 and that is even more particular than the GN2. With most aftermarket chargers, it absolutely refuses to charge. I've had so much trouble finding a charger for it I've just stopped using the tablet since I only have one working charger for it.
It really sucks spending anywhere between $2-$30 dollars on a charger and not knowing if it will work. My success rate has been less than 10%.
I try to do forum and google searches, but all I seem to find are comments like "I bought this charger. Seems to work." With no detailed information on what performance they are getting out of it.
This is really turning me off samsung products. I don't have this problem with my HTC or LG android devices.
I don't know why you have problems, I have 2 samsung devices (phones) and I chare them with their original chargers, charger from Nexus 7 and my old charger from Desire HD and all work just fine... ofcourse, the original one is the fastest, since it is 2A, HTC one is 750mA and Ativ S one is 500mA, N7 one is 1A....
dalanik said:
I don't know why you have problems,
Click to expand...
Click to collapse
You kind of answer this for yourself, as follows:
dalanik said:
I have 2 samsung devices (phones) and I chare them with their original chargers, charger from Nexus 7 and my old charger from Desire HD and all work just fine... ofcourse, the original one is the fastest, since it is 2A, HTC one is 750mA and Ativ S one is 500mA, N7 one is 1A....
Click to expand...
Click to collapse
Your stock charger is 2A. (about 1.5-2 hours to charge)
Your HTC charger is 750mA (about 4-5 hours to charge)
Your ATV charger is 500mA (no better than a computer port. 6-8 hours to charge)
This was my point. This IS my problem. Obviously the stock charger works at 2A, but with any other charger it is anyones guess as to what speeds you're going to get out of it. Even when they are specified to work at 2A, you are likely not going to get 2A out of it. The phone is so bloody fickle.
If there was some benchmark or specific set of criteria I could use when I purchase a new charger to know for certain if it will charge at 2A, then that would mitigate some of the problem at least. But right now, there is none as far as I can tell. When I purchase a charger, I literally have no idea if it will run at 2A with this phone.
I'm glad that you're not bothered by the slow charging speeds and are happy with <1A. I'm sure this works well for most people. It doesn't for me. I push my phone to the max (as I have every right to) and need a charger that can keep up.
Well, charging slowly is different to what you say i.e. "refusing to charge at all" etc. And of course I don't use Ativ's charger to charge N2 often, it would take ages But I use HTC's charger that is 750mA and it charges within 2 hours which is OK.
Anyways, the only solution for you is to buy BRANDED charger from a company you can trust not some cheap chinese, t should work just fine whether it gives 2A or 1.9A is really no big difference.
dalanik said:
Well, charging slowly is different to what you say i.e. "refusing to charge at all" etc. And of course I don't use Ativ's charger to charge N2 often, it would take ages But I use HTC's charger that is 750mA and it charges within 2 hours which is OK.
Anyways, the only solution for you is to buy BRANDED charger from a company you can trust not some cheap chinese, t should work just fine whether it gives 2A or 1.9A is really no big difference.
Click to expand...
Click to collapse
Well, there are chargers that refuse to work. Especially with the Galaxy Note 10.1.
Cheap ebay chargers are a crapshoot, that much goes without saying. But there are many brand-name chargers that don't work at full speed, despite being rated for 2A.
Its not so much a charger thing as a samsung thing. While I'm not able to find specific criteria as to how/why the phone decides to charge at the speed it does (which is really the only question I had with this thread), I can tell you that there are many brand name products (monoprice, anker, ngear, etc) that are rated for 2A, but will not run at 2A with the samsung. They will usually run at 2A with other products though.
The more research I do, the more I highly suspect that this is a case of Samsung propriety. It looks like that they are deliberately throttling aftermarket chargers to force you to buy their overpriced samsung chargers. As I understand it, it has something to do with creating a voltage divider between two of the contacts, but every diagram I find shows a different wiring scheme. This would indicate that no one really knows for sure.
The one and ONLY question I have with this thread is to find out what criteria the N7100 uses to determine how much amperage to draw. I remain confident that no one will answer this question because it seems no one knows.
For the Note 2: there is a way to get a simple measurement of how much current is being pulled. Refer to this thread for the apk and more info.
alpha-niner64 said:
For the Note 2: there is a way to get a simple measurement of how much current is being pulled. Refer to this thread for the apk and more info.
Click to expand...
Click to collapse
Thanks for posting this. I suppose I should have mentioned that I have this app already and it is incredibly useful. I also have this, which with only a few bizarre exceptions, reports the same as the app.
The more people who are aware of this app, the better. People who think that their aftermarket charger "works fine for me" are probably unaware of how much those chargers are under-performing.
I don't have the education to explain your situation your situation well. But it boils down the electrical engineering the the physics of electricity.
There are quite a few variables that all effect the charging of devices. First thing is what does the device require for charge input, which is both amps and voltage. For whatever reason, quite a few tablets require 15 volts versus 5, which is what most mobile phones need. I have this same issue with my ASUS Transformer Infinity pad. It requires 2.0amps with 15 volts. I have a Galaxy Note II with needs 2.0amps with 5 volts. Unfortunately, when I use my phone charger with the tablet, it puts out enough to trigger a charger is plugged in (turns on tablet if it is off), but not enough to trigger there is actual charging. It does charge it, but it's a trickle charge; basically if it using while plugged in, it only slows the battery depletion rate.
As for the charge output, now you're getting into build quality, resistance of the components of the charger itself and the USB cable being used.
And then depending the device, the pins used on the USB cable can have an effect too. This mostly occurs with tablets or proprietary cables because the pins may tell the hardware what kind of charger is being used, which may have built in limits for charging.
Hopefully that helps some.
lovekeiiy said:
I don't have the education to explain your situation your situation well. But it boils down the electrical engineering the the physics of electricity.
There are quite a few variables that all effect the charging of devices. First thing is what does the device require for charge input, which is both amps and voltage. For whatever reason, quite a few tablets require 15 volts versus 5, which is what most mobile phones need. I have this same issue with my ASUS Transformer Infinity pad. It requires 2.0amps with 15 volts. I have a Galaxy Note II with needs 2.0amps with 5 volts. Unfortunately, when I use my phone charger with the tablet, it puts out enough to trigger a charger is plugged in (turns on tablet if it is off), but not enough to trigger there is actual charging. It does charge it, but it's a trickle charge; basically if it using while plugged in, it only slows the battery depletion rate.
As for the charge output, now you're getting into build quality, resistance of the components of the charger itself and the USB cable being used.
And then depending the device, the pins used on the USB cable can have an effect too. This mostly occurs with tablets or proprietary cables because the pins may tell the hardware what kind of charger is being used, which may have built in limits for charging.
Hopefully that helps some.
Click to expand...
Click to collapse
That last part is correct. I actually know enough about electrical circuits to be pretty sure it is the phone deciding how much power to pull.
Ohms law states that the amperage of a circuit is the voltage of the circuit devided by the resistance (in ohms).
USB circuits are almost universally 5 volts. I remember reading somewhere that a phone has a potentiometer that protects it from circuits of incorrect voltage, up to a certain amount. This is probably why you can get away with sticking a 15V charger onto your phone and not blowing it up. You cannot depend on this however. Generally, you do not want to stick a charger into your device that is a different voltage rating than what the charger is rated for.
The charger decides the voltage, using an internal device that changes AC voltage (120VAC if youre american) to 5VDC (USB) or whatever your device needs. This device is called a rectifier.
As stated above, the charger decides the voltage. The battery determines the resistance*, therefore the amperage is the natural result of deviding the voltage by the resistance.
*Resistance is added to the circuit by the wire and the charger itself, but is usually inconsequential.
When a charger says that it is rated for a certain amperage, that means that it is the maximum amount of current that thr internal components can handle safely, without running the risk of earth-shattering kabooms (fire). If the circuit you have connected to your charger contains too little resistance, you will increase the amperage (ohms law, as stated above), and you may end up with a piece of charcoal where your charger used to be.
Thr fact that the samaung phones can change the amperage of a charging circuit so fickly must mean the phone is capable of changing its resistance. So the question becomes, what criteria is it using to determine when to change the resistancr and to what?
-PW
This may be the longest thing ive ever typed on my phone.
I'm not disagreeing since, as you said, the mobile device manufactures have build in some safe guards so we don't fry them from incorrect chargers or over charging.
But there are charges that are 15v. I've have one that came with my ASUS Transformer Infinity Pad. I think many Samsung tablets are in the same boat. I don't recall using that charger on any of my smartphones; if I have, it's only been once or twice, but good possibility I may never have. But as stated earlier, I have used my phone chargers on the tablet, but only does a trickle charge. That tablet has some wide input plug at the end of the USB cord. I'm thinking one of the pins must not get enough power to trigger the full charge. Yet, if I use my Anker external battery, set it to 15v, and a few adapters, it triggers the normal charge cycle.
Don't forget,phones such as Galaxy Note 2, Galaxy S3, use 11pin microUSB ports versus the standard 5. I have no idea what all pins do or trigger, My assumption, part of your answer why the charge output varies lies with how they're use the other pins. I know quite a few tablets have more than 5 pins since the USB port is some wide thing; the ASUS does because it carries data and power for the separate keyboard that can be attached to be a suedo-laptop that has USB ports, battery and full 104 key keyboard; I don't recall what other ports the attachment may have.
I still hold that part of charge difference is also the USB cord itself since difference materials have difference resistance. It may not be as significant as the charger itself, but I've seen significant differences in charging times or depletion rates (around 10% battery per hour) using MHL adapters purely on the USB cables.
Yes, typing out long replies on the phone's virtual keyboard blows monkey chunks. Thus, I use a blue tooth keyboard instead for those situations. I also have a blue tooth mouse, LOL.