Related
http://androidforums.com/asus-eee-pad-transformer/382444-bargain-car-charger-inverter-uk-5-a.html
Jason71 on AndroidForums.com said:
Hi all
Long time Android addict and just got myself a transformer at the weekend. I have been puzzling the best way to charge it in car (read the threads on the subject) when I happened to wander in to Asda and spotted a mini 75W 12-230v power inverter on sale reduced from £20 to £5!. They are exactly the same as ones that sell on Ebay for 2-4 times that price out of Hongkong e.g.
12V to Mains 75w Car Van Mini Power Inverter Adaptor | eBay
I bought one and tried it on the way home from the store with the Asus AC charger and the transformer and it worked perfectly.
As a bonus it has a usb port built in not only rated at 1000ma but wired to be recognised as an AC charger (many arn't) which means it will do full speed charging on an android phone. So it should supply enough current to charge my HTC Desire even when using it as a satnav (many don’t). The only downside is that the flange on the Asus mains charger covers the edge of the USB port on the inverter so you cannot use both the AC and the USB at the same time without trimming the flange on the Asus a little.
Anyway I thought this was too good a deal not to share it with you guys.
Click to expand...
Click to collapse
So this is what we need! It looks huge though!!
http://www.nextag.com/12v-to-110v-car-adapter/compare-html have fun, go mad?
krugm0f0 said:
http://androidforums.com/asus-eee-pad-transformer/382444-bargain-car-charger-inverter-uk-5-a.html
So this is what we need! It looks huge though!!
http://www.nextag.com/12v-to-110v-car-adapter/compare-html have fun, go mad?
Click to expand...
Click to collapse
The ASUS AC charger is normally working very close to it's limits when running off fairly stable AC mains. Running off this modified sine wave poorly regulated device may be enough to push it past its limits. If you want a good mobile solution that you can use for the TF and other small DC devices, search for the thread by Devcake where he lists options and actual reviews.
I went with this:
http://www.ebay.com/itm/250899196416?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
And this:
http://www.ebay.com/itm/300547025189?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
DAFTEK said:
I went with this:
http://www.ebay.com/itm/250899196416?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
And this:
http://www.ebay.com/itm/300547025189?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Click to expand...
Click to collapse
Does your TF indicate charging, e.g. with Dual Battery Widget, using this bullet charger?
E.g. If it outputs 11V-12V it should indicate charging on the TF, but if less than 11V, say 5V-10V, it would trickle charge only (no indicator).
I got one from same guy, and it does not work. I measured 2.8V output.
Bob Smith42 said:
Does your TF indicate charging, e.g. with Dual Battery Widget, using this bullet charger?
E.g. If it outputs 11V-12V it should indicate charging on the TF, but if less than 11V, say 5V-10V, it would trickle charge only (no indicator).
I got one from same guy, and it does not work. I measured 2.8V output.
Click to expand...
Click to collapse
Mine arrived today. I hooked it up to 12v and tested the pins, got 2.8v. Then plugged i transformer and waited about 20 seconds. The transformer said it was charging on AC. I havent checked to see how quickly it was charging, but it gave the charging indication with the screen on.
EDIT: Tried it on another vehicle and now won't charge. Weird!
Any update to this working?
$1.99
I use this one for my phone (HTC Desire HD). It should also be okay for the Transformer, right?
http://www.dealextreme.com/p/car-cigarette-powered-1000ma-usb-adapter-charger-black-dc-12v-40470
/edit 1A limit could lead to slower charging, worst case (?).. by the way, there also is a 2 ampere model : http://www.dealextreme.com/p/universal-2000ma-usb-car-charger-adapter-for-digital-devices-black-12-24v-72961.. at $4 something, twice as expensive
kkoenen said:
I use this one for my phone (HTC Desire HD). It should also be okay for the Transformer, right?
http://www.dealextreme.com/p/car-cigarette-powered-1000ma-usb-adapter-charger-black-dc-12v-40470
/edit 1A limit could lead to slower charging, worst case (?)
Click to expand...
Click to collapse
Nope, won't charge.
Output:5V 1A
DAFTEK said:
I went with this:
http://www.ebay.com/itm/250899196416?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
And this:
http://www.ebay.com/itm/300547025189?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Click to expand...
Click to collapse
This one arrived today, there is one small issue with it, when you first plug it in the lighter the blue light gets bright and the asus orange light goes on and eventually green showing also the charging symbol, but if you unplug the cable from the charger and plug back in, it wont work, you have to unplug the charger from the lighter and plug back in. weird... But it works
This claims to be even more powerful. Just ordered but it will takes ages to get to me.
amm009uk said:
This claims to be even more powerful. Just ordered but it will takes ages to get to me.
Click to expand...
Click to collapse
sorry, I don't think it will work.. the transformer needs 15V to charge, that one only is a 5V charger. i'd cancel my order.
OK, let's go over this again. The TF will charge with 5V at 1.5 amp but take forever to do so. The amps has nothing to do with it. It is the volts. If you feed the TF with 11V to 15V at 1.5 amp's or more it goes into the fast charge mode and charges in about 2 hrs. Anything that says 5V will charge the TF if you have several days to wait. If you have just hours you must charge using 11 to 15 volts at 1.5 amp or more to charge with. This is what the original power supply is doing. Please look at the specifications printed on the original charging brick. Note that it has dual outputs 5V and 15V if you plug your phone into the ASUS charger the charger is smart enough to know not to output 15V however when you plug in the TF the charger outputs 15V to charge the TF in the speedy mode.
Please read over "Dvecakes" thread for even more details and items you can use to charge the TF on the go and at home.
Hope this helps.
hshoem1
You guys need to read my DIY charger thread. For $12 you can make a car charger.
Check the thread links in my signature.
PatrickVogeli said:
sorry, I don't think it will work.. the transformer needs 15V to charge, that one only is a 5V charger. i'd cancel my order.
Click to expand...
Click to collapse
hshoem1 said:
OK, let's go over this again. The TF will charge with 5V at 1.5 amp but take forever to do so. The amps has nothing to do with it. It is the volts. If you feed the TF with 11V to 15V at 1.5 amp's or more it goes into the fast charge mode and charges in about 2 hrs. Anything that says 5V will charge the TF if you have several days to wait. If you have just hours you must charge using 11 to 15 volts at 1.5 amp or more to charge with. This is what the original power supply is doing. Please look at the specifications printed on the original charging brick. Note that it has dual outputs 5V and 15V if you plug your phone into the ASUS charger the charger is smart enough to know not to output 15V however when you plug in the TF the charger outputs 15V to charge the TF in the speedy mode.
Please read over "Dvecakes" thread for even more details and items you can use to charge the TF on the go and at home.
Hope this helps.
hshoem1
Click to expand...
Click to collapse
DevCake said:
You guys need to read my DIY charger thread. For $12 you can make a car charger.
Check the thread links in my signature.
Click to expand...
Click to collapse
Ok that was me being lazy and not reading! Thanks for straightening me out guys. DevCakes's thread is the place for all answers what more can you ask even the links are there
Has anyone by chance tried this car charger?
www.amazon.com/NTK-BULLET-CHARGER-T...Q4VU/ref=sr_1_1?ie=UTF8&qid=1324413368&sr=8-1
Also Does anyone have one of these replacement cables? I think I would probably order one directly from Asus though instead of trying to save a couple of bucks.
www.amazon.com/Aftermarket-Charging...?s=electronics&ie=UTF8&qid=1324413882&sr=1-13
I want to put together a car charger to just leave in the car.
Anyone know if there is any advantage of the charger that comes with the phone compared to a generic micro USB charger?
Sent from my HTC_Amaze_4G using XDA App
They all seem to charge the phone slowly (even the included one). The stock charger is a 1 amp charger, as long as you're using a 1+ amp charger, you'll be fine. Some aftermarket chargers may be lower, they will also work but charge even more slowly. Worth mentioning is that a higher amperage charger will work, but will only charge at the same speed as the included charger.
Same..........
Just bought a new charger cause I left my other in another state, it's the dual usb 3.1 amp charger and it took me from 0 - 90% in 45 minutes. Picked it up at tmo
jre1981 said:
Just bought a new charger cause I left my other in another state, it's the dual usb 3.1 amp charger and it took me from 0 - 90% in 45 minutes. Picked it up at tmo
Click to expand...
Click to collapse
Which charger is this exactly?
Is this the 'Universal Micro USB 2-in-1 Charger' listed on TMobile's website?
I also got a cheap micro USB charger off of amazon.com and its a trickle charge and it also makes the screen unusable as in it doesn't take touch input at all it came with a data cable for the computer as well and it actually drained my battery instead of charged it.
Has anyone found a portable Battery pack that we can use on the TF? I have several that I have used for my iPhone and my old iPad2 but all are only 5v. is there one out there that can charge out TF or is the keyboard dock the only way to go for extra Battery?
There are several battery packs used for notebook computers that will work listed on Amazon. Just be sure they have a 12Volt output. EverReady had as battery pack that will also work but you will need an adapter provided by them. The key is that you need an output of 12 to 15 volts to charge the TF or Keyboard. You might read Devcake's post on a DIY charger for the TF as information on the voltages required to charge the TF. There is also a post on external batteries that might help.
hshoem1
By chance do you have a link to the EverReady battery pack? I would like to see it
hshoem1 said:
There are several battery packs used for notebook computers that will work listed on Amazon. Just be sure they have a 12Volt output. EverReady had as battery pack that will also work but you will need an adapter provided by them. The key is that you need an output of 12 to 15 volts to charge the TF or Keyboard. You might read Devcake's post on a DIY charger for the TF as information on the voltages required to charge the TF. There is also a post on external batteries that might help.
hshoem1
Click to expand...
Click to collapse
I have an XP8000 from Energizer, and work perfectly.
w w w.energizerpowerpacks.com/us/products/xp8000/
You will need a conector for Asus (Willy cable WI15) from them. You will have two free tips a year for the life of product
By any chance do you know the tip number?
The cable you note doesn't appear to connect directly to the Transformer.
What setup are you using to connect to the Transformer?
Thanks
steve
The cable it's a Female USB with 16V output. You need the Asus cable.
xp8000
I looked in the web site and it is expensiver than Asus keyboard!
alberteske said:
I looked in the web site and it is expensiver than Asus keyboard!
Click to expand...
Click to collapse
May as well get the keyboard then xD. Thats the whole point of it being a transformer anyways
RojoNinja said:
May as well get the keyboard then xD. Thats the whole point of it being a transformer anyways
Click to expand...
Click to collapse
Or get both, even better
I just saw this while I'm looking for a battery pack.
On a german page I found this interesting:
w w w.intecro.de/XTPower-MP-16000-Powerbank-mobiler-Akku-mit-16000mAh-fuer-Laptop-Handy-iPhone-iPod-iPad-PDA-MP3-Player-mit-20-Adaptern
(can'f find an english page for this product)
Could I use this one by using an adapter?
I just got an Anker Astro3 10000mAh battery pack. I plan to use it while camping this summer, mainly to charge a phone, but occasionally to charge my tablet.
It is intended to charge 5V USB devices, and has two USB ports. It also has a 12 volt port. The adapters for the 12 volt port, of course, do not work with USB or the Transformer. So I made an adapter, and I am good to go now for charging the tablet.
The battery pack charges from a 12 volt wall charger. I have also made an adapter to charge it from the 12 volts on my motorcycle. So I will be charging it from the motorcycle during the day when riding, then using it to charge my devices in the evening at the camp. I've already tried it a couple of times, and it worked well.
I tried to charge the battery pack using a solar panel, but the solar panel was far too wimpy. It was like trying to run a house air conditioner from a penlight battery. It may make you feel good to try it, but it isn't going to do much.
So far so good. This is very close to what I need.
The issues I have had to work around are:
1) I want to also charge an in helmet bluetooth intercom from the USB port. But the charge current is so low, the battery pack auto powers off, thinking nothing is plugged in. Not a big deal because I can plug in my phone at the same time. That keeps it turned on until everything is charged, then it auto shuts down.
2) When I charge the Asus Tablet, it doesn't appear to auto shut down. Just the opposite of #1, it looks like the load stays high enough to never shut down when charging the tablet. This may not really be true, as I have only tried it a couple of times. Also, it isn't good for much more then one and a half charges of the tablet, as expected.
3) You need to figure out your own harness to get the 12 volts to the tablet.
4) No charge cable for a car. I mean this is rated for an input of like 10 to 15 volts, or some such. This thing is GREAT for charging portable devices. Charging it from a car is as simple as a cable, but there isn't one.
Over all this charger is a winner. At right around $55 US, I recommend it, if you can fabricate a plug for charging the Transformer.
Try a 12V UPS type battery along with a 2A fuse and adapters. It only costs about $20 or so. Plan on using only 50% of its capacity and recharge often to get the most life out of it.
Someone posted this product on another post
http://www.sobuying.com/products/Solar-Charger-For-Notebook,-Ipad,-tablet-pc,-Cell-phone,-MP3,-Laptop-11200mAh.html
May suit your needs
NiHaoMike said:
Try a 12V UPS type battery along with a 2A fuse and adapters. It only costs about $20 or so. Plan on using only 50% of its capacity and recharge often to get the most life out of it.
Click to expand...
Click to collapse
For me, this is actually what I use now. But it has issues.
One is simply that it is large. I carry it in the trailer that I tow behind the motorcycle, so it is OK, but a bit too large and heavy. It is a gel cell that has about a 48 WattHr capacity. LiIon has a a lot less and weight. In this case, it has about the same capacity, in a very small light weight package.
The other problem is charging the lead acid battery is an issue. I need to carry a AC charger and find AC when camping. I put a diode/resistor combo in the trailer and tapped off of the taillights. but by the time the weak motorcycle voltage gets to the taillights, add in the diode and other losses, and I'm lucky to see 13 volts at the battery. Not enough to charge it very well. The LiIon pack I use has the supply built in to charge properly from +12.
So I've tossed the lead brick battery (literally) and upgraded to a portable LiIon pack. So far so good.
This is what I use "Portable 12V DC USB 5V Rechargeable Lithium Li-ion Battery Pack for CCTV Camera" search on ebay, you can get one up to 13AH
I got a 3.8AH version for $16 , Dimension: 9.2cm X 6.0cm X 3.0cm
Outout rated 5V (5.8AH) and 12.8V (3.8AH)
small modification because the charger is NON-US wall plug, I just pull the plug pin out and add in a regular power cord cut off from an old appliance
Keep the USB plug for 5V use, cut the 12V DC cable and connect it to a female USB cable (pin 1 and pin 4) , then you can plug in the Asus usb/charge cable directly and charge or power the Asus
...
I've got around 4 different micro-USB AC Adapters that I have lying around. One is the OEM Lenovo, One is OEM Samsung (i777 charger + Samsung Micro-USB cable), one is a multi-USB port AC adapter with a micro-usb cable, and the last is an iPad 2 wall charger with a micro-USB cable.
ALL of the chargers except the OEM Lenovo ones don't charge my tablet. When It's plugged in, for a couple of seconds it says Charging (AC), and then it just switches to discharging. I've tried all the aforementioned chargers and cables in different combinations, and the ONLY ones to work correctly is the Lenovo combo.
Is there a specific reason to this? Also tried all 4 cables connected to my PC.. They all don't charge efficiently at all.
look at the Voltage and Amperage of the adapter !
Lenovo use 2A if I remember well, the other use only 1A
quyTam is correct... most USB chargers are between 500mA and 850mA. The dual battery design of the tablets requires a min of 2A to charge correctly. This is why most computer USB ports will not charge the device.
However... the changer isn't the only thing restricting the power. The cable you are using can also effect power. Not all cables are created equal.
I stopped by Staples just after getting my tablet and picked up a 4 port 2.1A USB wall charger. It will charge my phone, Bluetooth, and tablet. There are also really nice 2A "extra battery" devices out there that allow you to a charged battery with you that will power and recharge your device.
I also recommend the dock for the tablet... it has a 65w power supply and charges the tablet in a 1/3 the time then the usb chargers.
where to get a charger
i tried 2Amp chargers....didn't help/
my brother says:
"the pins are slightly different/off/longer/shorter/what DID lenovo do here?"
as a safety i bought:
http://www.ebay.com/sch/?_kw=886605022780&_clu=2&_fcid=100&_fvi=1&_localstpos=&_stpos=&gbr=1
just in case...
it costs an arm and a leg for a microUSB charger, but not charging the device for a couple of days would cost me more :S
just another things that makes the TPT slightly less then perfect
o,O
Charger
I use a Dell Axim x51 charger and an LG cable from an old phone. Seems to work very well and eBay prices for the charger are less than $4.
http://rootzwiki.com/topic/8523-rev...arger/page__st__40__gopid__448194#entry448194
In my experience a 1A charger will also work. Nothing less than 1A will do anything.
I keep my Lenovo charger in my home office and use a 1A phone charger next to my bed for overnight charging.
I too have a 4 port mains to USB charger: 2A but I thought it was distributed to the 4 ports. If all were being used then each port would only be .5A.
Will have to try it out. If it works it would lighten the travel load of chargers.
Gottoon said:
quyTam is correct... most USB chargers are between 500mA and 850mA. The dual battery design of the tablets requires a min of 2A to charge correctly. This is why most computer USB ports will not charge the device.
However... the changer isn't the only thing restricting the power. The cable you are using can also effect power. Not all cables are created equal.
I stopped by Staples just after getting my tablet and picked up a 4 port 2.1A USB wall charger. It will charge my phone, Bluetooth, and tablet. There are also really nice 2A "extra battery" devices out there that allow you to a charged battery with you that will power and recharge your device.
I also recommend the dock for the tablet... it has a 65w power supply and charges the tablet in a 1/3 the time then the usb chargers.
Click to expand...
Click to collapse
That's for sure. I thought the dock was a waste of money until I forked out on Amazon. Saves so much time it isn't funny....
Sent from my Nexus S using xda premium
The tablet needs to see 5.3 V, when using >500mA.
Already thinner USB-Cables increase the voltage drop
so the thinkpad wont charge, even with the original charger.
It may have less to do with your charger than with the cables. I bought extra long (6 and 10 ft) USB cables for charging phone and my TPT. The 28AWG of any length won't charge the TPT. The 24AWG 6 ft and 10ft cable *will* on a 2A charger. I haven't tried other combinations. I believe it will charge on a 1A charger as well, but would likely require the larger 24AWG cable.
Sent from my PC36100 using Tapatalk
Design Flaw in Thinkpad Tablet prevents Landscape Mode Charging for Developers
I actually sent my 1838-22U in for service, thinking that there was a hardware problem preventing charging while connected via USB. At first I had noticed that while connected directly to a PC via USB for development purposes (no docking station), the unit indicated that it was charging. However, it seemed to be discharging faster than it was charging and slowly worked its way down to unusable. Lenovo Tech Support indicated that they had heard of this happening, and that I should send it in to have its system board replaced. I sent it in only to find that all they had done was replace the battery and reload the firmware. I did notice, however, that when I connected the USB cable, it appeared to go into charging mode for a couple of seconds then switch into discharge mode. I asked Tech Support about this and they said they this was actually the way it should have been behaving all along, and that this was by design.
The User Manual (see attachment) states only that it might not charge, and that it will only discharge if the tablet "exceeds USB 2.0 power limits" (i.e. 500ma).
Well, the Thinkpad Tablet seems to be pretty good at doing that.
Here's where I present to the development community a conundrum. How can one develop in landscape mode while charging (even slowly)? In portrait mode, one can use the accessory docking station, which uses its own charger and charges through the proprietary connector next to the micro USB port, while separately allowing the USB to be used for data. In landscape mode, there is no such option. I will accept that the unit may draw too much current to charge well via a 500ma USB data connection, but then Lenovo should provide a optional charger that connects directly to the same proprietary connector used by the docking station. This is done elsewhere. For instance, Motorola realizes that the Xoom draws too much current to charge via a USB data connection, so they don't even bother with it - they provide a dedicated charger connection and charger.
==UPDATE== 25-May-2012
SOLUTION FOUND
The solution to using a data connection and charging the Thinkpad Tablet at the same time, without relying on the portrait-mode-only Dock Station, is to connect through a powered USB hub which supports the USB Battery Charging Specification (with a Charging Downstream Port). The specification provides at least 1.5A, which quite handily satisfies the Thinkpad. I found such a hub, the GWCTech HU2V40, on Amazon for $15.99.
If you get this model, note that only one of the 4 ports can be used for high-current charging. It includes a tiny "Smart Charger Adapter" but which appears to block the data connection (at least when when used with the Thinkpad). In other words, ignore the little black passthrough adapter included with it, and plug directly in as you normally would. The instructions don't explain the purpose of the passthrough adapter.
Hi everyone!
I just wanted to ask this: I just bought a 90W charger for my laptop. It is a "Targus Compact Charger for laptop and usb tablet"
It charges my laptop and also has that usb port which charges through a cable, compatible devices. Only that on that usb port, it says that it charges 2.1A, which is a lot. My phone charger does only 550mAh.
So the question, shouldn't I charge my phone through the adapter?
Thanks in advance!
i have this tablet for a couple days now, when i plug the power adapter to the mains the power adapter gets really hot.
does anyone have the same result or is just normal? i know that the adapter obviously will get hot, but it seems a bit to hot, just the adapter the usb cable is fine and so is the tablet
Its normal. If it gets to hot it shuts off. I hear you have to put it in the freezer to attempt to bring it back.
Sent from my VS910 4G using xda premium
well, i just dont want to wake up one morning and find the all lot burned.
but it does get really hot
Noticed the same thing with mine. I'm actually on my second pad for other reasons, but I didn't notice the charger getting as hot with my first one. But it only seems to get hot when actively charging. I've checked it after letting it sit still plugged in, but after it finished charging and it was fine.
I just try not to leave it charging if I'm sleeping or going out. Although, I forgot to unplug it this time...
Sent from my DROID BIONIC using Tapatalk 2
can we charge the tablet via the pc usb port?
its hard not to leave the tablet charging over night when your using every day
LUCA LUCA said:
can we charge the tablet via the pc usb port?
its hard not to leave the tablet charging over night when your using every day
Click to expand...
Click to collapse
No. Other threads in this forum tell you why.
the reason the charger gets so hot is it's 15 volts
and it takes minimum 12 volts for the tablet to kick into charging mode
so to answer your question
a usb port does charge the tablet, but usb is only 5 volts
so it will not show charging
and it will probably take 24 hrs to fully charge
Mine gets hot while charging but once it hits 100% it cools back down. I don't charge it while sleeping for this reason. Also according to the manual the PC will charge it bult as previously mentioned it takes longer. The tablet must be powered off when charging this way or it won't charge.
Sent from my ASUS Transformer Pad TF300T using xda app-developers app
Same as other itt, it will heat up when charging, but if it's left in the wall unplugged from the tab/dock it cools back down.
Perhaps it needs 12v for full charge speed, but the 300 also trickle charges when plugged into a computer USB port.
i have notice that, when it finishes charging, that just cools down, i was just wondering did i get a faulty one, but as ye say its normal
thanks for all the replys
Luca
even there the charger gets very hot, so it is normal, also, we are going to have very hot temps these days, (40°C here)...
just be sure to not plug it near easy flammable things!
ciao
Yes we have noticed the charger gets very hot might have something to do with fast recharge time the device has
Sent from the network via FTL com buoy
Good evening,
On my charger i notice it is wrting : "output 5v--2A or 15v --1.2A"
This mind that i can use the charger for any phone that charge usualy wiht 5V ?? Do the charger "swap" the voltage by him self if it's not connect to the tablet ???
I don't want to burn my HTC, but to have one charger for the tablet and the phone will be good when travelling
Thanks
Yann
Sent from my ASUS Transformer Pad TF300TG using xda app-developers app
yannmrt said:
Good evening,
On my charger i notice it is wrting : "output 5v--2A or 15v --1.2A"
This mind that i can use the charger for any phone that charge usualy wiht 5V ?? Do the charger "swap" the voltage by him self if it's not connect to the tablet ???
I don't want to burn my HTC, but to have one charger for the tablet and the phone will be good when travelling
Thanks
Yann
Sent from my ASUS Transformer Pad TF300TG using xda app-developers app
Click to expand...
Click to collapse
The charger that comes with the Transformer is dual-purpose. If you plug in a Transformer tablet, it'll output the 15V to rapid-charge your Transformer. If you plug in a USB device, it'll output 5V at 2A to rapid-charge your USB device.
If you're wondering how it can tell the difference, Pin #7 on the USB3 Transformer cable is grounded -- this is how the charger can tell the difference between a Transormer and an ordinary USB device.
yannmrt said:
Good evening,
On my charger i notice it is wrting : "output 5v--2A or 15v --1.2A"
This mind that i can use the charger for any phone that charge usualy wiht 5V ?? Do the charger "swap" the voltage by him self if it's not connect to the tablet ???
I don't want to burn my HTC, but to have one charger for the tablet and the phone will be good when travelling
Thanks
Yann
Sent from my ASUS Transformer Pad TF300TG using xda app-developers app
Click to expand...
Click to collapse
In fact the charger of Asus is quite tricky. I haven't found any substitution, only stock charger can be used.
hung2900 said:
In fact the charger of Asus is quite tricky. I haven't found any substitution, only stock charger can be used.
Click to expand...
Click to collapse
the connector look to be non standard as if you put an usb extension cable it wont charge.
NixZero said:
the connector look to be non standard as if you put an usb extension cable it wont charge.
Click to expand...
Click to collapse
It's not a non-standard connector -- it's a USB 3.0 connector.
If you use a USB 3.0 extension cable, it will work. If you use a non-USB 3.0 extension cable, the charger won't see that pin 7 is grounded, so you'll just get 5V instead of 15V. There's no bi-directional communication between the two.
The Transformer will charge when it sees 12V to 15V on what's typically the 5V pin.
The Asus charger will output 15V (earlier units were 12V) when it senses pin 7 is grounded.
Also, if you'd like to build your own power supply -- get any old female USB connector, and send 12V to 15V on pin 1 instead of 5V, and you've got yourself an Asus Transformer charger. Just don't plug anything else into it, since there's no safeguard to prevent 12-15V going into a 5V device. I've painted mine orange so I don't mistake it.
Hi, my Transformer pad won't charge normally when I connect it to the power adapter direclty - it doesn't show it's charging (though I can tell it is, because after some half an hour it had 2 % more of battery)... can it be that the charger doesn't recognize the tab and gives only 5V? Why? It works normally when I charge it on the docking station (through the power adapter), and the same cable works normally when I use it to transfer media to the pad from the PC...
P.S. When conneted to the power adapter directly, the orange light on the power button of the pad doesn't go on... it only goes on when the pad is on the dock and the power adapter is plugged into it.
Any ideas?
krhainos said:
The charger that comes with the Transformer is dual-purpose. If you plug in a Transformer tablet, it'll output the 15V to rapid-charge your Transformer. If you plug in a USB device, it'll output 5V at 2A to rapid-charge your USB device.
If you're wondering how it can tell the difference, Pin #7 on the USB3 Transformer cable is grounded -- this is how the charger can tell the difference between a Transormer and an ordinary USB device.
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krhainos said:
It's not a non-standard connector -- it's a USB 3.0 connector.
If you use a USB 3.0 extension cable, it will work. If you use a non-USB 3.0 extension cable, the charger won't see that pin 7 is grounded, so you'll just get 5V instead of 15V. There's no bi-directional communication between the two.
The Transformer will charge when it sees 12V to 15V on what's typically the 5V pin.
The Asus charger will output 15V (earlier units were 12V) when it senses pin 7 is grounded.
Also, if you'd like to build your own power supply -- get any old female USB connector, and send 12V to 15V on pin 1 instead of 5V, and you've got yourself an Asus Transformer charger. Just don't plug anything else into it, since there's no safeguard to prevent 12-15V going into a 5V device. I've painted mine orange so I don't mistake it.
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Click to collapse
Good info to know, Krhainos. Thanks for sharing that with us. I've been wondering about using the Asus plug for other USB devices I have and the information you supplied answered those questions. :good: