On Fri, 26 Dec 2008 15:59:39 -0800 (PST), Jerry G. wrote:

If I want to charge the Motorola phone on a PC, I have to have their
full program software installed. To recharge the Blackberry I can have
their simple stand alone driver installed on any PC. I don't need the
complete software package.

Hi Jerry G.
Thank you! You are the voice of reason, experience, and knowledge!

You've solved a problem that caused me a problem in the past!

This explains why I couldn't charge my daughter's Motorola RAZR on a
vacation this summer. I thought it was the cable even though I had used the
cable on my Blackberry and it worked just fine. I threw away the mini-usb
cable thinking it was bad! Now I know it wasn't bad. It was just not the
Motorola mini-usb cable!

The referenced URL below also says why. Thank you for pointing this out!
http://pinouts.ru/CellularPhones-A-N...r_pinout.shtml

Pat
PS: The solution is to buy a new Motorola cable, and return the brand new
Blackberry cable in its place.

RAZR V3 will not charge by simply supplying 5V through USB (it"s possible
to use a common USB cable for charging if you are using the Motorola
special PC driver software).
Motorola uses the pin between Pin #3 and #4 (Pin X) to sense what device is
attached to the mini-USB port. Shorting Pin #3 to #2 and #X causes the
phone to go into handsfree/carkit mode and the LCD backlight will ignore
timeout settings and stay on.
Shorting pin X to pin 2 and to pin 4 via R=200KOhm causes the phone to go
into charge mode.

MOTORIZR Z6tv - In Order to make your PC charge your phone through a usb
cable w/o installing any special drivers or softwa Short pins 2 and 3,
then put a 200K Ohm resistor between pins X and 4.

- The phone supplies ~2.14Vdc to pin X before anything is plugged
into it. It needs to be dropped 1V to approx 1.16Vdc. Putting a 200K Ohm
resistor between Pins X and 4 will bring that voltage down to around
1.16Vdc.

- The wall charger has pins 2 and 3 shorted together. Not sure if
it's a safe practice shorting the USB DATA lines together on your PC, so do
at your own risk. However, it does work on my terminal with out any ill
effects.
AC adapter
Pin Name Direction Description
1 +5 VDC -?- PC USB Pin 1 (+5 VDC).
2 USB Data -?- shorted to pin x in charger cable.
3 USB Data -?- not connected
X -?- Shorted to pin 2 + shorted to pin 4 via R=200KOhm in charge
cable. (R=165KOhm?)
4 GND -?- PC USB pin 4 (GND). Shorted to pin X via R=200KOhm in charge
cable. (R=165KOhm?)



Comment by Darrin
A standard Motorola USB charger puts ~1.4vdc onto the x pin of the mini USB
plug. A 200k resistor between pin 2 and 4 produces ~1.9vdc on the x pin.
This works for Motorola Q (which works from ~1.2vdc to ~1.9vdc), but not
for Razr V3m. I had to lower the resistor to 165k. This produces ~1.5vdc
and allows the charger to become authorized.

Comment by Andre
After many trial and error, the working pinout for my RAZR V3C was to short
2 and 3 THEN Short X and Gnd with a 200KOhm resistor. Work good on my
unbranded USB car charger and with a PC without any driver installed.

Here is a schematic :

1 _____________ +5V ____________
2 _______,
PHONE SIDE 3_______/
USB / Power Supply side
X_______/\/200Kohm /\__,__ GND ___
4___________________/