Motorola RAZR V3 mini-USB Charger pinout

connector or cable wiring scheme

5 pin mini-USB plug connector
at the AC adapter

RAZR V3 will not charge by simply supplying 5V through USB (it's possible to use common USB cable for charging if you are using 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.

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.

Pinouts.ru > A-N (Alcatel, ..., NEC) cell phones connectors pinouts listing > Pinout of Motorola RAZR V3 mini-USB Charger and layout of 5 pin mini-USB plug connector	Document status:	correct
Contributor: Jo Sugiura, updated by Ark	11 reports
Last updated at Sat May 12 2007. Submit additions or corrections for this document.	Is this document correct or incorrect? What is your opinion?

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