The machine (US verion) came with a 100v-240v AC to DC USB charger. The label mentioned 5-15V
1) Does it mean it can charge the machine 15V AND any other 5V smartphone as well?
2) Is there any other way I can charge up my machine? is there any way I can get the 12v from my desktop USB socket?
Please help me if you know...
Geeka said:
The machine (US verion) came with a 100v-240v AC to DC USB charger. The label mentioned 5-15V
1) Does it mean it can charge the machine 15V AND any other 5V smartphone as well?
2) Is there any other way I can charge up my machine? is there any way I can get the 12v from my desktop USB socket?
Please help me if you know...
Click to expand...
Click to collapse
#1 yes^a
#2 yes^b, no^c
Note a: DevCake posted a thread here showing the USB plug is actually USB 3.0 style (not standard) where pin 7 (USB 3 only) triggers switch from 5v to 15v for tablet only.
Note b: DevCake and many others have posted alternatives to the wall wort, where you plug in your ASUS proprietary 40 pin cable to female USB charging at 11v-15v. Warning, if you plug your iPad, iPhone, cellphone, etc., into 11v-15v you will KILL them.
Note c: USB sockets on laptop/pc only provide 5v, where USB 2 is 0.5 amp & USB 3 is 1.0 amp. Neither is up to 11v-15v required by the TF101 tablet & dock to activate the charging indicator.
PS: In my opinion, only idiots (or desperate) trickle charge their tablet with 5v, by turning off the tablet and waiting days for full charge.
Related
I would like an additional charger as supplied in the box: from a wall socket 220v to mini usb. I see many usb charge cables but does anyone know where I can get a wall charger?
I heard usb charging is a lot slower and a usb-pc is not always available to plug into....
Not sure what country you are from...
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=5841022471&category=67832
It says its for the iPOD but it's got the same 5.5v output required - as with all USB devices.
Just do a search for USB Wall Chargers on the net and you'll get loads.
thanks Looks good. Does anyone know if charging this way actuallu IS faster then charging from pc?
Depends on the power output of a given charger...
USB charging is done at 5 volts and 0.5 amps (more or less - I seem to recall that the wall charger for the Blue Angel delivered about 0.7 amps and a bit below 6v, possibly 5.5).
Differences in speed of charging may be achieved if the supply current is higher (logically, since power = volts * amps) although I would be very surprised if the device did not have current limiting hardware in place, which may reduce or remove any advantage.
This means that it should be possible to charge the device faster (assuming it is not precisely self regulating) with a higher power output wall charger than a Windows managed PC. Most people selling USB wall chargers should specify the volts/amps of the charger and I would be suspicious of the seller if this were not the case! Personally, I'd recommend buying a (good - beware of cheapy!) retractable sync/charge cable and both wall and car power adapters with a USB socket as it allows you the most flexibility from the smallest physical amount of kit.
HTH
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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Click to collapse
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'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 was wondering if anyone has tried this solar charger, any input would be greatly appreciated. http://www.sobuying.com/products/So...let-pc,-Cell-phone,-MP3,-Laptop-11200mAh.html
Voltage looks like it would work, but it needs a USB 3.0 adapter to charge from...otherwise it won't connect to the tablet.
You will need to use one of the higher voltages (between 12V and 16VDC) but have it go to a USB connector. Most USB chargers will ONLY output the standard 5 VDC via the USB tip to protect USB devices. Since the Transformer charges using 15 VDC you need to put this across pin 1 and 4 on the USB connector.
It does not need to be USB 3.0. The TF wall wart uses the extra USB 3.0 pins to charge, but 15 VDC is not a USB 3.0 standard (it is still 5 VDC).
I did a DIY 12 VDC charger for my car. I took a USB charger and stripped it, wired it so the 12 VDC from the car just runs straight through to the USB connector. Charges like a champ, but you do not want to use it for any other USB devices or it may fry them.
znpp said:
I was wondering if anyone has tried this solar charger, any input would be greatly appreciated. http://www.sobuying.com/products/So...let-pc,-Cell-phone,-MP3,-Laptop-11200mAh.html
Click to expand...
Click to collapse
if you get it please post how is it? been looking for a tablet charger
http://www.voltaicsystems.com/spark.shtml#specifications
this was the one i was looking at but... the price is like....
thanks
Has anyone successfully used a 12v usb charger other than the BN ripoff? I have a gmax 2.1a and aluratek 2a and neither one will charge the bn tablet. I get the "not charging" message on the tablet.. so I supposed its getting some juice, but not enough to sustain it. I soldered d+/d- together on both adapters and now both will show ac charging in the nexus - so I know each is getting close to 1amp. Ironically, the tablet will show ac charging if I use the nexus power ac power cube which is rated at 5v / 1amp output. So you would think the 12v usb adapters which are rated the same would work as well.
thoughts?
darby427 said:
Has anyone successfully used a 12v usb charger other than the BN ripoff? I have a gmax 2.1a and aluratek 2a and neither one will charge the bn tablet. I get the "not charging" message on the tablet.. so I supposed its getting some juice, but not enough to sustain it. I soldered d+/d- together on both adapters and now both will show ac charging in the nexus - so I know each is getting close to 1amp. Ironically, the tablet will show ac charging if I use the nexus power ac power cube which is rated at 5v / 1amp output. So you would think the 12v usb adapters which are rated the same would work as well.
thoughts?
Click to expand...
Click to collapse
did you read about the 'special' connector that is deeper than the normal ones ? please use the search function for more info.
sure did.. all of this was with the [email protected] cable..
old_fart said:
did you read about the 'special' connector that is deeper than the normal ones ? please use the search function for more info.
Click to expand...
Click to collapse
There's also the part of the equation where the USB adapter must supply a lot more than the 500mA of current that most adapters and computer USB ports are limited to. Mine will say "charging" as long as the adapter puts out around 1A (1000mA) or more and I use the NT's supplied cable. <-- But it still won't charge as quickly as it does when I use a 2A charger such as the one it came with. The factory charger is around 2A and expecting the NT to charge with anything less may not result how you'd like. Just because your phone likes a charger doesn't mean your NT will.
There is more to it than just shorting the D+ and D- pins. If the charger was designed for iPad, then you will also need to remove 4 resistors. Check out the two links in my post relating this issue at http://forum.xda-developers.com/showthread.php?t=1614091
I modded a car charger by just shorting the two pins. My HTC EVO 4G phone showed AC charging but my NT showed USB charging. I opened it up again and removed the resistors network and NT showed AC charging right away. Good luck.
bigdogz - good advice - made an attempt at it but my eyesight and hand steadiness aint what it used to be However, I did find one that works - Scosche reviveII - GUSBC3. Its a 2.1a port for the galaxy tab and a 1amp port for apple. It charges both the galaxy tab 10.1 and the nook tablet on the 2.1a port. It also will charge in ac mode a galaxy nexus from the tab port. The 1a port does not have the d pins shorted, but will charge an iphone.