brock@uncacsci-pi-j:~/Adafruit_Python_PCA9685/Adafruit_PCA9685$ python3
Python 3.4.2 (default, Oct 19 2014, 13:31:11) 
[GCC 4.9.1] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import Adafruit_PCA9685
>>> pwm = Adafruit_PCA9685.PCA9685()
>>> pwm
<Adafruit_PCA9685.PCA9685.PCA9685 object at 0xb69e9810>
>>> pwm._device
<Adafruit_GPIO.I2C.Device object at 0xb69e9830>
>>> pwm._device.readU8(0x06+12)
0
>>> pwm._device.readU8(0x06+13)
0
>>> pwm._device.readU8(0x06+4*12)
0
>>> pwm._device.readU8(0x07+4*12)
0
>>> pwm._device.readU8(0x08+4*12)
0
>>> pwm._device.readU8(0x09+4*12)
0
>>> pwm.set_pwm(15,0,2000)
>>> pwm._device.readU8(0x06+4*15)
0
>>> pwm._device.readU8(0x07+4*15)
0
>>> pwm._device.readU8(0x08+4*15)
208
>>> pwm._device.readU8(0x09+4*15)
7
>>> 7*256+208
2000
>>> 
brock@uncacsci-pi-j:~/Adafruit_Python_PCA9685/Adafruit_PCA9685$