Mini USB Micro USB Converter

Discussion in 'Motorola Droid 2' started by mrmattch3w, Jan 2, 2011.

  1. mrmattch3w
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    mrmattch3w Member

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    Hey guys!

    I was sitting at work with my 8 day old D2G. Im all thered up to my laptop and started noticing that when i use my tether i am consuming power faster than i can charge it. =] being the nerd i am i know that this isn't ridiculous.

    My question is this:
    If I use a usb cable meant for external hard drive (the ones that sometimes require you to plug into two USB ports) will I be able to charge the phone faster? Of course I will also be using the mini to micro converter but I do not see that causing any problems.

    Is there a risk if i do this? I'm pretty sure even if I use two USB ports to charge it still won't charge the battery as fast as the rapid charger the phone comes with.

    Thought, ideas, and criticism is greatly appreciated =]

    for reference:
    Amazon.com: 6FT External HDD USB Y Cable: Electronics
    +
    Amazon.com: OEM Mini USB to Micro USB Adapter (SKN6252) for Verizon Motorola Adventure V750: Electronics
     
  2. FoxKat
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    FoxKat Resident Novelist...LOL! Staff Member Premium Member

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    Both the Droid 1 & 2 (along with the Global, R2D2, and X) use the same AC adapter which is rated at 850 mA (850 milliamps) of current. However, the USB Standard output for power in a unit load is defined as 100 mA for low power devices such as thumb drives in USB 2.0, and was raised to 150 mA in USB 3.0. A maximum of 5 unit loads or 500 mA for high powered devices such as hard drives can be drawn from a single port in USB 2.0, which was raised to 6 unit loads or 900 mA for high powered devices in USB 3.0.

    As you are aware, some devices like high-speed external disk drives may require more than 500 mA of current and therefore cannot be powered from one USB 2.0 port. Such devices usually come with a Y-shaped cable (as you mentioned) that has two USB connectors to be inserted into 2 powered USB 2.0 ports on a computer or powered USB 2.0 hub. With such a cable a device can draw power from two USB ports simultaneously. Theoretically, this would provide up to 1 A (Amp) or 1,000 mA of power from a USB 2.0 powered hub or USB 2.0 powered internal interface.

    Since the phone is supplied with 850 mA from the home charger, which is a "standard" charger, and yet USB 2.0 only supplies 500 mA, it would make sense that the phone might actually discharge ever so slightly while using tether, especially since tether uses the phone's Cellular radio constantly. On the other hand, since the "rapid" chargers supplied with the car docking station (model SPN5400) provides (I believe) 950 mA, it appears that you could use the y cable with USB 2.0 as you suggested which would supply higher current comparable to the rapid charger (1,000 mA - 50 mA higher than the rapid charger), meaning it WOULD charge the phone like the rapid charger if you weren't tethering at the same time.

    If you could install (or had) a USB 3.0 interface in the pc it would give you 900 mA from one port (50 mA shy of the rapid charging rate and 50 mA over the standard rate) with just the standard Motorola Droid1/2/Global/R2D2/X USB/Charging cable. Note, you would get as much as 1.8 A from a 3.0 powered hub or powered internal interface if you used the Y adapter on a USB 3.0 interface or USB 3.0 powered hub, but I wouldn't take that risk as it may be far too much for the battery and cause overheating or permanent damage. I suggest before you use the Y adapter, make sure it's not on a 3.0 interface or 3.0 powered hub.

    By the way, this (Universal Mini to Micro USB Charger Adapter Converter - eBay (item 280531589175 end time Jan-03-11 19:51:59 PST)) is even cheaper (shipping included for $ 0.99) and would work just as well as the one you listed. I just bought 3 of them for less than $3.00 total shipped! Also, this (http://cgi.ebay.com/USB-2-0-Mini-5-...444?pt=LH_DefaultDomain_0&hash=item3a60627d0c) is only $1.78 shipped and is again a perfect replacement for the one you listed. Of course, you could go with this (http://cgi.ebay.com/STARTECH-USB2HA...354?pt=LH_DefaultDomain_0&hash=item45f730e5e2) but the cost of $21.66 is outrageous.
     
  3. mrmattch3w
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    mrmattch3w Member

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    thanks for all the info. it reconfirms the theory i had in my head. X_X i actually cannot recall all the voltages and technical data off the top of my head but I figured it as such. as for USB 3.0 im no so sure that that tech is going to catch on.

    all i really need to purchase is the converter seeing as i have a million and a half of the y cables. ill prolly do somthing to the tune of a benchmark. i should be able to collect suffient data since i am going back to shcool again and will be usong my phone quite often in different situations.

    what do you think... charge time relative to battery life should be more than enough to prove or disprove the above mentioned. i don't think it is necessary or practical for me to actually whip out a voltage meter to know EXACTLY how much power is going in and out.

    anyways thanks for reply. if anyone else has anything to chime in it could only help. i think this one was real a quickie

    10:41PM *just bought 5 of these =]
     
  4. FoxKat
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    FoxKat Resident Novelist...LOL! Staff Member Premium Member

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    Actually, the 950 mA "Rapid charger" is supposed to charge a dead battery to 90% in between 2 and 3 hours depending on the ambient temperature and resulting battery temperature (warmer batteries charge quicker). So given that information, the battery should actually charge slightly while tethering if using the "rapid charge" rate of 1,000 mA from a USB 2.0 Y adapter.:)
     
  5. mrcloudy
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    mrcloudy New Member

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    Hi. I bought the Startech USB y-cable from Amazon a week ago. Today got around to testing it and it DOES NOT work with my Droid X. The idea of simultaneously rapid charging and syncing is good. I hope it works for your phone!:unsure:
     
  6. mrmattch3w
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    mrmattch3w Member

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    so the y cable did absolutely nothing as in it didnt charge....or try to install drivers or anything?

    im just waitin for the adapters to come in and then ill post up with results
     
  7. mrcloudy
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    mrcloudy New Member

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    Cables don't generally try to install drivers xD... The phone would sync with the computer but it wouldn't charge.:icon_evil:
     
  8. FoxKat
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    FoxKat Resident Novelist...LOL! Staff Member Premium Member

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    Very strange... ALL USB cables are supposed to carry power and data (see below). Even a single cable (rather than Y cable) should at least trigger the recognition within the phone that it is connected to external power when plugged into a powered USB port, even if it isn't enough to actually charge (i.e. add to power).


    Pin Name Cable color Description
    1 VCC Red +5 VDC
    2 D- White Data -
    3 D+ Green Data +
    4 GND Black Ground


    Now, a non-powered USB port does carry some power, but very little.

    USB power usage:
    Bus-powered hubs: Draw Max 100 mA at power up and 500 mA normally.
    Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port.
    Low power, bus-powered functions: Draw Max 100 mA.
    High power, bus-powered functions: Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port.
    Self-powered functions: Draw Max 100 mA.
    Suspended device: Max 0.5 mA

    The OEM Power Adapter from Motorola supplies 850mA which is more than a powered hub port, but it is also designed to charge the phone to about 90% within 2-3 hours. A powered hub port with 500mA should accomplish the same level of charge in about 6 hours in a phone that is on (since while charging the phone is also using power), and within about 4 hours if the phone is in charge-only mode.

    When you say it didn't charge, did it at least show the phone as being connected to an external power source?
     
  9. mrcloudy
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    mrcloudy New Member

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    It would say that it was charging but charge gauge would drop instead of rise. In other words, it would drop all the way down to about 10% and then cut off despite saying that it was charging...
     
  10. FoxKat
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    FoxKat Resident Novelist...LOL! Staff Member Premium Member

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  11. mrcloudy
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  12. FoxKat
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    Interesting...

    Well, I can see phone manufacturers trying to prevent damage to computers due to excessive draw, but as I understood it, the port will only put out what it can, and the device can't make it "try" to draw more than the port is rated for. Considering this, I don't know why they would fear this happening.

    I will have to experiment as well once I get the adapters I ordered. I do know this...my phone does charge from the desktop port I mentioned, and also at work from my desktop PC through an identical arrangement, so it is at least pulling 500mA. I'll have to put it through some heavy power-drawing operations and see if I can "get the power meter to turn backwards".

    BTW, the hack for the cable explained does away with the data connection and uses those wires to carry additional current, so the cable then only works to power and charge. This is obviously not what you are trying to do, so it wouldn't work for you (or for most others).
     
  13. mrcloudy
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    mrcloudy New Member

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    Yep edited it and added another link and thanks again.
     
  14. mrmattch3w
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    mrmattch3w Member

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    wow. thjis thread is semi-poppin lol i took it off auto notify on my phone. interesting stuff going on hope to get more info. From the knowledge that I know, i know that each USB port is capeable to supply 5V...and some external HDDs need 10V to function. For a afact, i know that most of the newer iMacs have USB ports that put out 10V

    i dunno exactly how many maH that is but i know it puts out potentially DOUBLE the amount of power. i think its moving more towards knowing what USB ports put out more power and how much power they put out.

    @FoxKat...i believe if you set the USB setting to charge only that the phonge charges just like a wall charger
     
  15. FoxKat
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    I think you have volts and amps (milliamps) mixed up. The ports all put out 5 volts, but some devices need more milliamps than the ports are rated for. Each port can put out a maximum of 500mA, so to get to the up to 1A (1,000 mA) required by some devices, you tap two USB ports with a "Y" cable. Since USB is a standard, any devices that operate on the USB standard either use the 5 volts that the USB port supplies, or if they need more than 5 volts, they come with an adapter to supply the needed higher voltages from a wall outlet. The same holds true for external drives for instance, when they require more than 500mA, like one I have that has its own power supply. That drive only uses the USB port for the data and takes its power from the wall adapter instead.
     
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