Hack a Female USB Port to a Motorola Phone Charger

Step 5 Charging a motorola phone

Take the original charger cable, and solder the ends to a male USB cable. The cable will allow you to charge your Motorola phone. I wouldn't recommend using this cable with anything else other than a Motorola phone, since it has circuitry that puts the phone into charge mode, which could damage other devices.

Comments

[CalcProgrammer1]

Pretty sure the "charging circuit" is just jumping the Data + and - lines. From what I've read, those two pins need to be jumped to make some devices charge. I'd check it with a multimeter to make sure, as I don't think a true "circuit" (something capable of transmitting a specific signal) would fit in that tiny plug.

[LegendofPedro]

The data lines are pulled to ground through a 15K resistor. These resistors should be added so your USB devices can draw 500ma. Without them, they won't draw more than 100ma, so will take longer to charge.

[LegendofPedro]

Sorry, that's pulled to +5V.

[klee27x]

Can you clarify what you posted here? Are you saying that pulling up the data lines tell the MOTHERBOARD of the computer to allow 500mA draw? Or are you saying that it tells some DEVICES to draw 500mA?

[LegendofPedro]

There is no motherboard involved. Which is what this solves. A USB device (phone, iPod etc.) will not draw the maximum amount of current before the host (normally the motherboard) tells it that it can. The resistors just send this signal, so they allow the device to draw more current. So they cause it to charge faster.

[mitchell931993]

a resitor is only complised of an element inside a casing- no data flow involved

[LegendofPedro]

Do you know how digital signals are sent? You either pull a data line momentarily high (to a +Vref) or low (to Gnd). The resistor limits the current provided to the data input on the IC.