Is there a special driver from Samsung or a hack that will enable the full 500mA per USB port on Win7? I checked the USB hub power settings and see the Vibrant only pulling 100mA. On XP it wasn't so bad. I'm almost desperate enough to try the Motorola drivers.
Sent from my SGH-T959 using XDA App
http://forum.xda-developers.com/showthread.php?t=728929
bchalk said:
http://forum.xda-developers.com/showthread.php?t=728929
Click to expand...
Click to collapse
Thanks, I'll try that. Hope it works.
I tried the drivers from the suggested thread and they didn't make any difference. They were already installed in my PC from the Samsung Kies installation.
Does anyone else have a suggestion how to make the PC USB ports in Windows 7 driver the full 500mA current?
Bumpity bump. I also would like to know why Win7 is only giving 100 mA (96, actually) to my phone. I'll have to check my XP station at work tomorrow as well.
I just checked my spare laptop that's still running vista, and Device Manager says the port is capable of 500 mA but the device is only drawing 96 mA. Possibly the charger on the battery is limiting the current?
The possibility of a hardware limiter in the phone is one of a few. Usb's of course max out a hub at 500mA. So if you have anything else plugged into the hub it'll split the charge. Assuming usb 2.0, I'm not sure if 3.0 increases allowed draw. It could also be a limitiation of the PSU itself. If you have a smaller psu and enough crap already leeching it, it will prevent additional draw.
The capabilities reported in Device Manager are not necessarily accurate.
Depending on your hardware, some ports may be limited to 100mA while others can do the full 500mA. This is especially common on laptops. If you have USB ports in different locations, try a port from each set.
For example, on my Lenovo I have one high speed port on the left that can do 500mA, while the two slower ports on the right can only do 100mA. (In this specific case, the faster port is actually designed to do double-duty as Firewire with the proper adapter.)
One of my desktop machines in my AV closet has three sets of USB ports and only those on the front panel will do 500mA, although they're all high speed, and they all report 500mA in Device Manager.
It just depends on your hardware. I wouldn't be surprised to hear there are some machines that don't have any 500mA ports.
Same problem with Captivate
I just got a Captivate, and seeing same problem with Windows XP. However, when I plug in a blackberry using same cable same port, Device manager is showing blackberry is pulling 500mA instead of 96mA. One Caveat: I can't install samsung driver since this is work machine. But my old (dumb) LG v8550 was pulling 500mA from USB port without a driver.
Hello community,
The XP desktop at work is also pushing 96mA to my Galaxy S. I do not want to (and I am not allowed to) install any drivers since it is a company workstation.
I am currently using the USB data cable from my old Nokia, I will test tomorrow with the "proper" Samsung cable to check if that's the issue.
I've tried USB with and without debugging enabled, as well as in several of the USB ports of the machine. I am rather sure the problem does not exist on the PC hardware (8USB ports, 6 of them free...).
We will see what comes out of here, but it is uncomfortable that it takes sooo long to charge...
Cheers
With the correct Windows drivers you should be getting 500mA. You can also try the mod in the below link to trick the phone into thinking it is plugged into a charger.
http://forum.xda-developers.com/showthread.php?t=774665
From past experience getting very low charge voltages on a PC is mainly a cable issue. In my case I bought a couple of cheap eBay cables and sometimes the 5V / GND cables were not connected or they were so flimsy that connectivity would break if I moved the cable. Always start with a known good cable.
Also use the charge widget mentioned in the above thread.
Related
Plugged my usb cord into my computer and it says to be plug into ac adapter cause usb is not sufficient enough to charge. It shows that it's charging but when I lock the screen and didn't even touch it with usb connected to the computer my battery just dies and its set to charge only.
Sound like your computer's USB port is screwed up and is not outputting enough current to charge the device.
If you have a powered USB hub handy, plug it into that, or try another USB port on your computer.
I'll see if that works just weird though since I was using the same port for my previous 3 phones and they would charge pretty fast but not this time.
whats odd is my gf just texted me and said that her cable isnt charging her phone at all. i'm going to have to go pick up her charger and stuff and test/return it.
Prob , you don't have the driver's installed .
My battery reading is really inconsistent was charger on a outlet said 28% rebooted then said 78% rebooted a couple of mins later and now it says 60%
superevo89 said:
I'll see if that works just weird though since I was using the same port for my previous 3 phones and they would charge pretty fast but not this time.
Click to expand...
Click to collapse
This particular phone may need the entire 500mA of current that USB ports are supposed to capable of supplying. The error on the computer may be because when the phone connects, and tells the computer that it wants 500mA of current, one of three things happens:
1.) The computer says no and throws an error.
2.) The computer said yes, but when the phone actually tries to draw the current, the hardware of the computer can't provide it.
3.) The Amaze doesn't ask if it's okay to draw 500mA (to which the PC may respond no), and just starts drawing the current, causing a hardware fault on the computer.
Your previous phones may not have required as much current, therefore not causing any issues.
I don't know this for sure, but I've done some programming with USB drivers and I know that "handshake" when a device plugs in, does happen.
Happened to me to. Same thing with the notice to use wall charger. Dumb. All my other phones work with PC. Just not this one.
Just had this happen, except...
* I didn't get the "you should plug into a wall" message
* Using the USB of the computer seemed to *suck* power from the phone; anti-charging, if you will.
I've got a wallcharger on it now. Maybe tomorrow I'll try my USB3 port for it...
The USB3 didn't help...
what drivers do I need to install? My G2 charged just fine on this computer.
What I have going on now is an older USB "y" cable for an external hard drive; one side of the "y" is data + power, the other is just power. I've got the "just power" side of the "Y" plugged into a wall jack...charges fine now.
theGleep said:
* I didn't get the "you should plug into a wall" message
* Using the USB of the computer seemed to *suck* power from the phone; anti-charging, if you will.
I've got a wallcharger on it now. Maybe tomorrow I'll try my USB3 port for it...
Click to expand...
Click to collapse
Trial and Error fixed it
theGleep said:
* I didn't get the "you should plug into a wall" message
* Using the USB of the computer seemed to *suck* power from the phone; anti-charging, if you will.
I've got a wallcharger on it now. Maybe tomorrow I'll try my USB3 port for it...
Click to expand...
Click to collapse
Guys, i found the solution, by trial and error...
forget about USB 3.0, drivers, micro/mini USb, app tweaks, AC usb charger etc.... You know what turned out to be the culprit ??
THE CABLE !
I realized that this charging issue happened only when using the aftermarket cable i bought from ebay, as an extra one to have on hand. While the backup cable was also OEM. (i could tell from the corn-plastic bag it came in...)
And all along it has worked fine for data transfer, sync etc, and also when charging it does in fact say it's charging... - only thing in actual it's draining.
So i downloaded the 'battery monitor widget' and kept a close eye on the mA number as i tried out different combinations of cables, stock and aftermarket along with stock and aftermarket AC chargers i had and all USB ports on my laptop.
With the cable from ebay mA was rather in negative using with all power sources, including USB.
With the stock cable from the box, it was a steady +200 to +350 on USB power, +400 to +700 on AC power.
Now the after market cable is also OEM, but it appears to be for another HTC phone, that the HTC Amaze 4G doesn't accept.
Also if your AC charger is model TC E250 it's only gonna show up as USB and not AC in battery status.
You need AC charger model TC U250 for the HTC Amaze 4G to be fired up.
There! That was what was wrong.
Hope this helps.
I did a quick search to see if anyone had this issue. Most chargers output 5.0 volts while the Touchpad charger outputs 5.3volts. While my problem is with a Nexus S, I think this will be of interest to Touchpad owners given the possible cause.
The other day I accidently used my Touchpad charger to recharge my Nexus S. Afterward, everything seemed fine until I attempted to connect it to my laptop to offload some files. While it worked the day before, my laptop (Windows 7 64-bit) no longer discovers the device. Suspecting a problem, I connected to another PC running Win7 32-bit and a Mac running Snow Leopard. All with Android SDK and drivers properly installed with the same result. The same goes if I first put the Nexus in bootloader mode.
What makes me think there may be hardware damage is this. If I power off the Nexus S, then plug in a charger or USB cable, the phone boots. I do not believe it did so before. In addition, in the past if I plugged a charger or USB cable the LCD would briefly light up. After the incident, it doesn't. It still charges though.
Not necessarily looking for answer here, just thought this might be a word of caution for those like me who own both devices.
It should'nt have
5.3 V instead of 5V = not a big enough difference to cause a problem
2A instead of 1A means nothing regarding your current (no pun intended) problem
Plus your nexus S has charge protection to protect it from incompatible chargers
I use my TP charger to fast charge (because of the 2A thing) my GS II and my wifes HTC desire
However Fast charging is not good for the long term life span of the battery
Nomedias said:
I did a quick search to see if anyone had this issue. Most chargers output 5.0 volts while the Touchpad charger outputs 5.3volts. While my problem is with a Nexus S, I think this will be of interest to Touchpad owners given the possible cause.
The other day I accidently used my Touchpad charger to recharge my Nexus S. Afterward, everything seemed fine until I attempted to connect it to my laptop to offload some files. While it worked the day before, my laptop (Windows 7 64-bit) no longer discovers the device. Suspecting a problem, I connected to another PC running Win7 32-bit and a Mac running Snow Leopard. All with Android SDK and drivers properly installed with the same result. The same goes if I first put the Nexus in bootloader mode.
What makes me think there may be hardware damage is this. If I power off the Nexus S, then plug in a charger or USB cable, the phone boots. I do not believe it did so before. In addition, in the past if I plugged a charger or USB cable the LCD would briefly light up. After the incident, it doesn't. It still charges though.
Not necessarily looking for answer here, just thought this might be a word of caution for those like me who own both devices.
Click to expand...
Click to collapse
I've been charging my Nexus S 4G as well as a couple of other android phones (Samsung Vibrant and Samsung Epic) regularly without issue for a month or so. I doubt the Touchpad charger was the issue.
I've been using the touchpad wire to charge my evo 4g for over amonth and it's still fine.
Thanks for the feedback guys. Now I'm stumped as to why it happened. It is definitely something lower-level than OS, given the boots-when-plugged-in behavior.
End result is I can only transfer files wirelessly, and since I recently reverted to stock, I can't root it again. Hopefully, the official ICS update is an OTA, and not via USB (like froyo on Samsung Vibrant). If not, I'll seek warranty replacement.
Sent from my Nexus S using xda premium
It hasn't effected my nexus s
even though the charger is higher rated im pretty sure the phone only draws the maximum that is safe.
Just a thought: have you been using the same data cable to test this the entire time? It is possible for a cable to charge but not be able to transfer data. You may want to try a different cable just in case... just an idea.
jake921660 said:
even though the charger is higher rated im pretty sure the phone only draws the maximum that is safe.
Click to expand...
Click to collapse
Voltage is "given" by the charger and current is "drawn by the device.
High overvoltage would be dangerous but not 0.3v!
The charger could be faulty and have affected the TP while still being usable for other devices.
And the TPs dont like under current charging either.
cpenticuff said:
Just a thought: have you been using the same data cable to test this the entire time? It is possible for a cable to charge but not be able to transfer data. You may want to try a different cable just in case... just an idea.
Click to expand...
Click to collapse
Forgot to mention I tried different cables as well. The same cables transfer data to/from other devices like my Touchpad, but not the Nexus S. Good idea though.
Sent from my HP Touchpad using xda premium
I've been charging my htc windows phone with the touchpad charger. It's almost twice as fast and i haven't had any problems.
I have been temped to use it but. the NS charger gives 700ma while the TP gives 2000ma, If you want your battery to live more years use the stock.
I even use the NS charger to charge the touchpad... it will charge to 100% during the night.
I use my 2A Galaxy Tab charger to charge everything, never had a problem. If my SGS2 is happy with it, the Nexus S shouldn't have a problem either.
Amperage is how much current the charger is capable of supplying, the device plugged into it won't necessarily draw anywhere near that much, I'd be surprised if any regular phone would draw as much as 1A while charging.
Put a multimeter across any 5V charger and you'll probably find it's putting out anywhere from 4.5V to 5.5V unless it's a particularly good quality one. If it's high current charger then it's more likely it'll have a more stable voltage under load (i.e. - while charging).
A +/- ~10% difference in charging voltage should be within tolerance for pretty much any electronic device.
I also use the TP charger for my Sensation, no problems.
Sent from my Sensation using Tapatalk
robrob777 said:
I have been temped to use it but. the NS charger gives 700ma while the TP gives 2000ma, If you want your battery to live more years use the stock.
I even use the NS charger to charge the touchpad... it will charge to 100% during the night.
Click to expand...
Click to collapse
Sorry to correct you, but, current is drawn by the device and it will only draw what it needs so there should be no problem
Have you tried blowing out the usb port on your phone or cleaning the connection?
thebadfrog said:
Have you tried blowing out the usb port on your phone or cleaning the connection?
Click to expand...
Click to collapse
Thanks, but no it didn't work.
Sent from my HP Touchpad using xda premium
Nomedias said:
I did a quick search to see if anyone had this issue. Most chargers output 5.0 volts while the Touchpad charger outputs 5.3volts. While my problem is with a Nexus S, I think this will be of interest to Touchpad owners given the possible cause.
The other day I accidently used my Touchpad charger to recharge my Nexus S. Afterward, everything seemed fine until I attempted to connect it to my laptop to offload some files. While it worked the day before, my laptop (Windows 7 64-bit) no longer discovers the device. Suspecting a problem, I connected to another PC running Win7 32-bit and a Mac running Snow Leopard. All with Android SDK and drivers properly installed with the same result. The same goes if I first put the Nexus in bootloader mode.
What makes me think there may be hardware damage is this. If I power off the Nexus S, then plug in a charger or USB cable, the phone boots. I do not believe it did so before. In addition, in the past if I plugged a charger or USB cable the LCD would briefly light up. After the incident, it doesn't. It still charges though.
Not necessarily looking for answer here, just thought this might be a word of caution for those like me who own both devices.
Click to expand...
Click to collapse
It's not the extra voltage. Either user error, reread guides... or hardware, cant't help you.
Nomedias said:
I did a quick search to see if anyone had this issue. Most chargers output 5.0 volts while the Touchpad charger outputs 5.3volts. While my problem is with a Nexus S, I think this will be of interest to Touchpad owners given the possible cause.
The other day I accidently used my Touchpad charger to recharge my Nexus S. Afterward, everything seemed fine until I attempted to connect it to my laptop to offload some files. While it worked the day before, my laptop (Windows 7 64-bit) no longer discovers the device. Suspecting a problem, I connected to another PC running Win7 32-bit and a Mac running Snow Leopard. All with Android SDK and drivers properly installed with the same result. The same goes if I first put the Nexus in bootloader mode.
What makes me think there may be hardware damage is this. If I power off the Nexus S, then plug in a charger or USB cable, the phone boots. I do not believe it did so before. In addition, in the past if I plugged a charger or USB cable the LCD would briefly light up. After the incident, it doesn't. It still charges though.
Not necessarily looking for answer here, just thought this might be a word of caution for those like me who own both devices.
Click to expand...
Click to collapse
I am having the exact same problem. My phone does not boot on its own when I connect the USB cable, which is a slight difference from what you described, but everything else is identical.
I hadn't previously thought of the Touchpad charger being the root of the problem, but after Googling "Nexus S charging but not USB connection," I came across this thread...and wouldn't you know, I've been using my Touchpad charger for the past two nights.
I haven't made any changes to my phone in the last two days. The only thing different from my normal routine was Touchpad charger.
May I ask, why touchpad can not charge with USB port on computer, only charge with hp touchpad charger ?
I have 4 different micro usb to usb cables and though they all charge the phone, only the cable that came with the phone will establish a data connection with my laptops/desktops and with kies (not air) on these computers.
i have searched and read but not found any information on this. if the cable is not proprietary to the phone, any idea why this would be happening?
btw, I have also tried usb to micro usb gender changers on many existing usb cables and the same problem exists...only the cable that came in the box will establish usable data transfer connections.
sorry if this has been asked and answered before, i cannot find it. if so, a referral link will be greatly appreciated.
thanks all
Marty (ddd22)
Really? I have 3 from my old HTC phones, and 2 from my Amazon Kindle and all 5 work just fine to charge (from wall or computer), and establish data connection (from computer).
I will say on my iMac I had issues because the type of internal powered USB Apple went with on the 2009-2011 iMacs, some models have data communications issues and the only way around it is to use a different computer with a non powered usb hub internally. Seems any other macs they offer besides this particular model work fine as I have no issues w\ my MacBook Air 2011 or my Mac Mini 2011
yep... really. and that is on three different laptops and two different desktops.... all running windows 7 ultimate or professional (and one windows 8 developer preview). also i have bypassed powered hubs to test... still only the significantly heavier samsung cable the only one to work. btw, thanks for your uber quick reply
ddd22 said:
yep... really. and that is on three different laptops and two different desktops.... all running windows 7 ultimate or professional (and one windows 8 developer preview). also i have bypassed powered hubs to test... still only the significantly heavier samsung cable the only one to work. btw, thanks for your uber quick reply
Click to expand...
Click to collapse
I'm wondering if your phone might have a bent pin or jenky config setting in the software somehow, that's just so strange.
If you plug in the non-sammy cable into the wall charger, does it charge?
---------- Post added at 08:50 AM ---------- Previous post was at 08:48 AM ----------
ddd22 said:
yep... really. and that is on three different laptops and two different desktops.... all running windows 7 ultimate or professional (and one windows 8 developer preview). also i have bypassed powered hubs to test... still only the significantly heavier samsung cable the only one to work. btw, thanks for your uber quick reply
Click to expand...
Click to collapse
And it probably goes without saying, but are you going into wireless, usb, data connection and enabling it before plugging in? You're on stock rooted I assume? Have you tried any other ROM to see if maybe it's something in your existing ROM that is messed up?
I'd be annoyed too, cause I travel weekly and leave 1 cable home, carry one in my laptop bag, and one in the bag that goes in the overhead bin in my roller-board. If I had to buy 3 samsung branded cables I'd be pissoff'ed hehe
yes the sammy cable charges from the wall.
the sammy cable makes a connection whether or not i enable usb before i plug it in or not.
when i preactivate the usb connect with the sammy cable i get the android usb connected screen. when I do it with any other cable i get a message that says: "attention, usb is connected, remove the cable" uber confused
any i am stock. havent yet rooted.
I've had this problem with my captivate. My friend gave me a micro USB that didn't make a data connection but charged my phone. and what I learned was the cable came from a third party vendor and just doesn't establish data because of the type of cable. If it comes for a phone (used HTC cable to flash my cappy) or some type of other device that needs data it will work. third party cables just charge from what I learned.
Sent from my SAMSUNG-SGH-I777 using XDA App
I use the cable from my old Nokia and it charges as well as transfers files to my SGS 2.
Sent from my SAMSUNG-SGH-I777 using xda premium
After 3 hrs on the phone with att customer ser, tech support, and the warranty dept (2x) the best anyone came up with was, as u said, notall micro usb ard the same. I found an adapter that may hhave come with phone (female full usb to micro) that worked with a regularlarge usb double ended cable, that also worked, this is most likely a cable problem. What I need to find is a reliable source of data friemdly usb to micro cables. thanks for your reply
I made a USB dongle that plugs into the USB port on the touchpad and provides a powered female USB-A port. It is basically a portable USB charger/battery with an OTG cable soldered to the USB port. Attached is a quick pdf showing the process. It's much smaller and more portable than using a y-cable and powered hub or battery pack.
The charger is $13 on Amazon with free prime shipping and OTG cables around $2 on ebay.
It's nice because it's small and I can secure it to the my case with a rubber band, providing a quick connection to a keyboard/mouse or usb flash drive. The particular charger charges via any powered USB port with a provided cable.
This is the battery pack I ordered, note the picture on the amazon page is not 100% accurate:
http://www.amazon.com/T-Mobile-Port..._1_1?s=wireless&ie=UTF8&qid=1325984238&sr=1-1
This is the cable I purchased, there are cheaper ones, but they ship from China:
http://www.ebay.com/itm/Micro-USB-O...ccessories&hash=item1e69fbb3c5#ht_1336wt_1398
Would that be powerful enough to power external portable hard drive like WD Passport?
gedas5 said:
Would that be powerful enough to power external portable hard drive like WD Passport?
Click to expand...
Click to collapse
Unfortunately, I don't have the power specs on the battery pack. If I come across a USB-powered hard drive, I'll test it.
scarletwahoo said:
I made a USB dongle that plugs into the USB port on the touchpad and provides a powered female USB-A port. It is basically a portable USB charger/battery with an OTG cable soldered to the USB port. Attached is a quick pdf showing the process. It's much smaller and more portable than using a y-cable and powered hub or battery pack.
The charger is $13 on Amazon with free prime shipping and OTG cables around $2 on ebay.
It's nice because it's small and I can secure it to the my case with a rubber band, providing a quick connection to a keyboard/mouse or usb flash drive. The particular charger charges via any powered USB port with a provided cable.
This is the battery pack I ordered, note the picture on the amazon page is not 100% accurate:
http://www.amazon.com/T-Mobile-Port..._1_1?s=wireless&ie=UTF8&qid=1325984238&sr=1-1
This is the cable I purchased, there are cheaper ones, but they ship from China:
http://www.ebay.com/itm/Micro-USB-O...ccessories&hash=item1e69fbb3c5#ht_1336wt_1398
Click to expand...
Click to collapse
that looks nice.. but you re saying that its plug and play?..
you dont have to mount/unmount?
why didnt you get one w/ more usb ports?
your pics are clear.
i wonder how easy it is to do the battery hub like yours but w/ 4 usb ports
Nicely done, very good solution and tutorial. again excellent!!!!
amkaos said:
that looks nice.. but you re saying that its plug and play?..
you dont have to mount/unmount?
why didnt you get one w/ more usb ports?
your pics are clear.
i wonder how easy it is to do the battery hub like yours but w/ 4 usb ports
Click to expand...
Click to collapse
http://www.amazon.com/Solar-Powered-Battery-Charger-Adapter/dp/B006DVMW92
This hub has 4 ports, a battery plus solar charging. That said, if I buy it I'll probably just plug it directly into the OTG cable rather than solder them together. Then again my soldering can be a little rough.
- Sent from a Prime terminal using a friends account
So can we only use the Micro Usb OTG host to connect to a USB drive/keyboard?
tpcm said:
So can we only use the Micro Usb OTG host to connect to a USB drive/keyboard?
Click to expand...
Click to collapse
yes plus 10char
Deserves sticky, love mods like this even if not always practical.
Cant believe they didnt give the touchpad a powered usb host. I guess they figured people would have issues with not enough power or drain the battery too quick with it.
So I think when I have some spare time I may mod your mod and show how to make a powered usb host that plugs into the wall charger so when your "docking" somewhere to charge you can hook up a keyboard and use it without restriction and even be charging the touchpad at the same time.
Probably don't even need to be too creative a proper Y cable may do the trick out the gate. Just to track one down.
Probably a stupid question, but it wouldn't be my first one...
Could you simply use a USB male-to-male cable to go between the battery pack and the OTG cable? Eliminate the soldering that way?
Or am I missing something?
I found a cable that I think will work perfectly for my idea of doing this from the charger instead of from battery: http://www.dealextreme.com/p/usb-fe...gb-tf-card-card-reader-kit-for-xtc-clip-82289
You can do it much cheaper with adapters and a regular y adapter though, and you may want to do so, so that you can have a longer cable from the charger to the y split, but yeah I will try this out sometime soon and let you know how it works.
The charger probably gives enough power to easily run things like a external HDD and such while the battery pack may not.
@Vicious ... couldn't that possibly put too much power to a USB device? Just saying since it is probably meant to be hooked up to a regular USB 5v port and (I don't know the specifics but) the touchpad USB power adapter has a high AMP output (might be talking sht here).
Nothing to worry about a device only "pulls" the amperage it needs so you can have extra with no harm to the device. It is the voltage that needs to match and usb is standard 5v.
Having too little amperage can actually cause a device harm due to malfunction, like a head crashing on a 2.5" hdd during use or a thumb drive failing to flash properly corrupting a sector.
I feel anybody that uses the touchpad in a docked setting that wants to use a keyboard may very well make use of my idea, that I of course got from the OP's idea.
I'll part it out for the cheapest way to make it without any cutting/soldering and test it soon enough.
mountaindewmi said:
@Vicious ... couldn't that possibly put too much power to a USB device? Just saying since it is probably meant to be hooked up to a regular USB 5v port and (I don't know the specifics but) the touchpad USB power adapter has a high AMP output (might be talking sht here).
Click to expand...
Click to collapse
That cable will work fine. I wasn't doing anything special, only eliminating the y-cable. I mainly wanted a small form factor way of adding a USB port to my case for portability. Now I can put a movie on a usb drive and watch it on the go.
You generally don't have to worry about using a supply that is to powerful. As long as the voltage output is 5 V, the device will only draw a certain current and consume the corresponding amount of power. The rating on a constant voltage supply is simply the maximum current it can provide, the amount it provides depends on the properties of the device.
Say you have a device, it states it operates at 5 V and draws 100 mA of current. That means the impedance of the device is R = V / I = 50 ohms. So if you use a 5 V supply rated to at least 100 mA, the device will only draw 100 mA. The supply can be rated for 100 mA or 1000 amps, it does not matter. (Although you wouldn't want to use 1000 A source as if something breaks or shorts it can draw a higher current)
Wikipedia "ohms law" if you are not familiar.
I tried to do this but can't get it to work, the touchpad shows the charging battery icon only it's not charging, and running dmesg it say source=charger mA=100 and usb otg exited low power mode and then right after says it entered low power mode... Not sure what the issue is...
edit: I'm thinking it may be my soldering work, gonna give it another pass...
joenathane said:
I tried to do this but can't get it to work, the touchpad shows the charging battery icon only it's not charging, and running dmesg it say source=charger mA=100 and usb otg exited low power mode and then right after says it entered low power mode... Not sure what the issue is...
edit: I'm thinking it may be my soldering work, gonna give it another pass...
Click to expand...
Click to collapse
You may have the two data pins shorted together. To the best of my knowledge, this tells the touchpad to go into charging mode. The touchpad charger does this, because in order to charge, it must draw more power than USB ports are designed to provide.
You need to remove the two resistors circled in the PDF. These keep the data pins shorted together as well.
This is a really great idea I think I might try it and your tut is very well explained thanks for taking the time out to put it all together
Thanks
Mouse works fine, keyboard hasn't been tried yet. How do you access a flash drive through this? What are the steps?
If you just cut out the resistors in the battery hub, could you just use the TP's regular cable to plug into one of the ports on the hub?
tpcm said:
Mouse works fine, keyboard hasn't been tried yet. How do you access a flash drive through this? What are the steps?
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Click to collapse
Stick mount works great
Sent from my CM9 TouchPad
I recently bought this generic charger with a USB 3.0 output connection for docking my Note 3 to keep it charged as much as possible while listening to music at work. (Listening to music alone doesn't cause much drain to the battery, but I get anxious when my battery falls below a certain percentage...I have problems, I know )
http://www.wowparts.com/charger-station-cradle-for-samsung-galaxy-note-3-n9000-n9002-n9005/
This cradle serves that purpose...mostly. I noticed it prior to buying but figured I'd give it a chance because of its low price, but the rear port does not utilize USB 3.0 but instead uses USB 2.0. I thought this might lead to a slower charging rate and it turns out I was right. Mind you, I experienced the show charge rate with it connected directly to a wall outlet, not a PC or another device.
I've searched for other cradles that also have a USB 3.0 output connection for the phone, but the ones I've found only have USB 2.0 input connections in the rear.
If I'm not mistaken, the Note 3 is the first mobile device to utilize USB 3.0 so I know that it's probably unlikely at this point, but has anyone else come across any cradles that utilize USB 3.0 for both the input and output connections?
Update: Never mind! Another user posted this in another thread http://www.shopandroid.com/samsung-desktop-dock/5AA15818.htm . It's strange, though, how it's Samsung-branded but it's not even listed on the Samsung site as one of the device accessories (at least not for the T-Mo version).
Sent from my SM-N900T using xda app-developers app