BlueBill:
Thanks all.I wish Microchip would have used a couple of extra pins on the device and allowed address setting the old fashioned way.
I'm guessing they expect most people to just tie it either high or low to select an address.
BlueBill:
- seems VCC & GND are valid voltages so 7 equal resistors say 1K @ 3.3V should be possible.
That doesn't work because you have to produce a voltage at the center of the required range.
Why do you need chain of resistors? I'd put two resistors per chip with suitable values to produce the address.
BlueBill:
2. trimpot just seems so sloppy, else it would be a obvious choice and cheap too.
It would probably work just fine. Each chip 'address' has 1/8th of a turn of tolerance, that's not too bad.
A trimmer also lets you change the chip address easily if you attach another device which clashes. No soldering required.