I2C Address Question
October 28, 2013
I have decided to jump into I2C after dragging my feet for a couple years..
My question revolves around wanting to get 24+ 7 Segment LED drivers (http://www.adafruit.com/products/879#Description) on the same I2C bus..
As far as I can tell I2C (from a RasPi) supports 7 bit addresses .... 128 devices WOOHOOOO !
But this doohicky has only 3 soldering bits ! NOOOOO! I was thinking.. hey, mebbe Adafruit decided it was just not roomy enough to have 7 sodering pads .. and if I look hard enough I can solder or short pins so that I can get all 7 bits ..
Looking at the datasheet - (page 26) - http://www.adafruit.com/datasheets/ht16K33v110.pdf
My questions are :
- Is this common practice.. I've heard of "base address" fron I2C device manufacturers .. doesn't this (like this case) whipe out a bunch of addresses ?!?!
- Is there any way around this ?
- Is there any slave device that is nice enough to give us all 7 bits ??!?
- WHATS GOING ON !?!?