This blog page is dedicated to the I2C components of the AR Drone. You can download a custom i2c driver for the voltage measurements of the PMAAC here.
0×49 Atmel AT73C246 Power Management and Analog Companions (PMAAC)
0×50 24C32WI eeprom
0x5d Bottom camera
0×21 Horizontal Camera – OmniVision ov7725