Hello. I want to be able to charge my Transformer Prime in my car. It didn't work with my 500mA GSM charger (which is normal, I guess), so I bought Tom-Tom "High Speed Multi Charger" (i can't post links), which is advertised as tablet (namely iPad of course) charger with 2A USB output port. Strangely it does not charge Prime too ! So my question is what voltage and current is needed to charge Prime ? Do I need a special cable ? Charger, that comes with Prime, says "OUTPUT: 15V/1.2A OR 5V/2A", which is strange for me also ?!?
15V if device is on, 5V if it is off.
Striatum_bdr said:
15V if device is on, 5V if it is off.
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Hmm, it doesn't charge. What do you mean "if it off" ? I tried to charge it when it is off, but it just turns on when I plug-in cable. If I turn off (long press button and select "shut down"), while it is still with plugged cable from charger I think it still does not charge - at least red LED does not light.
Related
Hello
As you know, our device doesnt get charged by the USB cable it comes with (or veeeeeery slow).
As I have a solar charging device with USB slots, I need a compatible USB cable. Somehow it has to work, is there some converter or something ?
Thanks!
Dominik
Eh? My device charges just fine with the included cable.
You will have trouble charging it from a solar powered USB charger as I'm guessing it will only put out 5V at maybe 500mA. That's not enough to juice the TF. It's not the cable though.
Because ASUS used a USB connector on its cable, unfortunately does *not* mean this USB connector 100% follows the specifications for USB.
It has a trick, whereby, when connecting to your PC it works like USB at 5v. But, when connecting to a 15v charger it switches to use 15v instead.
The TF charging indicator, and Android OS battery settings, only indicate charging when 15v applied. At 5v it may trickle charge with screen & wifi & ??? turned OFF. I never try charging at 5v because it is too slow.
LOL
I don't think it charges at all at 5v?
EDIT:
How can I delete a post?
Neo3D said:
I don't think it charges at all at 5v?
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It will, provided you have the amperage. But its only trickle so its only really charging with the screen off and charges slower than the tablet uses battery.
I don't know if its a problem in my NT.
It changes only when concocted to the wall charger, not even when it plugged to the PC.
Anyone of you notice this?
TThe NT or the NC comes with a 10 pin charging cable, i was told it has a higher capacity to charge your device. If you don't use that cable, charging will be much slower.
Using the pc will only triggle charge, meaning very slowly, and only with you turn the nt to sleep while plugged in ur pc.
It is just one of the proprietary feature on the nt, sorry.
It does not make any sense.
The NT wall charger is 0.5A. I plugged it to my iPhone charger, which is 1A, with the original cable and it didn't charge.
shaharg said:
It does not make any sense.
The NT wall charger is 0.5A. I plugged it to my iPhone charger, which is 1A, with the original cable and it didn't charge.
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0.5A must be the input, because the Nook Color/Tablet charger is 1.8A or 1.9A output
You are right. It is 1.9A
My mistake.
a normal micro usb cord cannot "fast charge" so in order for it to work you must trickle charge....plug it into your computer, unmount/eject the device(done on computer) and just turn it off/turn off the screen,
takes about an hour per ~10%.
Yup, its weird. It will say clearly: "not charging" but if you let it sit there plugged into any power source (0.5 amp USB included) and wait for a bit, the battery percentage will go up.
I read an early review, I think on Engadget, and it mentioned this as one of the few negatives of the device. Turns out, it just has a stupid UI.
Well, when you're using it, it isn't charging. There isn't enough juice to charge and run the device so it just runs off the USB power and doesn't use the battery. It needs to be sleeping then it can trickle charge as it uses a lot less power in sleep mode.
usb be plughin?
yes, in case prime is turned off...I'm in this mode as my charger is broken.
So how long does it take to charge through USB. Same amount, twice as long, or more?
What does 'usb be plughin?' mean?
It doesn't charge if the Prime is turned on, but I think it does it it's off.
drvsbsm said:
So how long does it take to charge through USB. Same amount, twice as long, or more?
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A considerable ammount more, look more towards it being a full day charging and it wont charge while the screen is on.
USB sockets dont have the power needed really so its more of a trickle charge.
5v - USB Vs 15v Power.
100Ma(0.1a) Vs 1200Ma (1.2a)
My prime can be charged through usb,but much slower than AC charger
I doubt it. You need to supply current at a voltage higher than the battery's voltage. Prime's battery = 7.4V, USB = 5V.
Edit: According to this post, the OG TF can use [email protected] or [email protected] (or conceivably [email protected]). Presumably Prime charging is same as OG TF. Suggest doing as SlimDan22 said and try an aftermarket iPad charger.
How do you know if it's charging? I don't see a red light or anything
noob_2010 said:
How do you know if it's charging? I don't see a red light or anything
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On the power button of the Prime when using the wall charger there is a tiny pinhole which lights up orange/red when charging, green when done. I don't know if using the USB charging method if it comes on.
donxuan1983 said:
yes, in case prime is turned off...I'm in this mode as my charger is broken.
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Actually, if you use a USB 3.0 port, the Prime will very slowly charge even while awake; it does not show the charging icon or the lights however.
It may also require the tablet to at least be in Deep Sleep to do so, but I left my Prime plugged into my desktop's 3.0 port overnight at one point and awoke to a fully-charged tablet.
Ready2Mosh said:
On the power button of the Prime when using the wall charger there is a tiny pinhole which lights up orange/red when charging, green when done. I don't know if using the USB charging method if it comes on.
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By the power button,?? No lights are on.
noob_2010 said:
By the power button,?? No lights are on.
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On the power button..... it will light up orange when chargin (ac) and green when charged.
Plugged in usb, it wont light up at all.
e.mote said:
I doubt it. You need to supply current at a voltage higher than the battery's voltage. Prime's battery = 7.4V, USB = 5V.
Edit: According to this post, the OG TF can use [email protected] or [email protected] (or conceivably [email protected]). Presumably Prime charging is same as OG TF. Suggest doing as SlimDan22 said and try an aftermarket iPad charger.
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Would [email protected] damage the Prime? How about [email protected]?
I've bought the powerbank 7000 A-Solar. Just for recharging my prime in those "no power sockets" situations. But when i connect it the charge lights do not turn on(yes the powerbank has been fully charged). Now i've read somewhere that even though the charge lite does not turn on it does charge the device. Anyone tried the same/have results with powerbanks? I know the prime needs 15V 1,2A for charging and the powerbank has a output of 5V 1A.
it will charge very slowly with such a device. Similar to using a PC and your power cord. The Prime needs to be off for it to charge at 5V
chillaxx said:
I know the prime needs 15V 1,2A for charging and the powerbank has a output of 5V 1A.
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^^^ That.
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
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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
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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
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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
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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.
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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.
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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.
Click to expand...
Click to collapse
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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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: