I need an addressable digital pot that comes as a DIP with an object in SPIN an

ElectricAye

Hey y'all,

I'm looking for an addressable digital pot that comes in a DIP. In my ideal world it would already have a SPIN object ready to use. I was thinking maybe about the DS1807, for which I've attached a data sheet. But I would rather have one that kept its pot position in the event of a power failure. And for the DS1807 I don't see any ready-made spin objects on the object exchange. On the Obex there is an object for the MCP414X, which has a non-volatile memory, but it does not seem to have an addressable feature.

Anyone out there have any suggestions or experience with these?

thanks,
Mark

Post Edited (ElectricAye) : 9/25/2008 4:24:48 PM GMT

Nick McClick

No experience. But why won't the AD5220 that Parallax already sells work? Here's the datasheet

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Concentrate on understanding the problem, not applying the tool

ElectricAye

Nick,
Although the AD5220 looks like a good device, to me it doesn't appear to have an addressable feature or the ability to keep its position during a power failure. Maybe I'm wrong about that. I need to control about 6 of these digital pots with my Propeller and I might be running out of pins on my Propeller if I try to use something like the AD5220. Ideally I would like to control about 6 of these chips using only a few wires. And if I lose power, I want the pots to stay where they are and not glitch me "a new one. "

thanks for the suggestion,
Mark

Beau Schwabe

ElectricAye,
·
If your looking for something that's going to be non-volatile and remember the wiper position upon power failure, there are several to choose from...
·
http://www.maxim-ic.com/products/digi_pot
·
The one you mention has a log taper.· If that's what you are looking for then this might work for you.
·
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5689

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Beau Schwabe

IC Layout Engineer
Parallax, Inc.

ElectricAye

Beau,

Hey thanks for these links. I love this decision tree page for the Maxim; it makes it easy to look around. I'll study this awhile.

cheers!
Mark

KeithE

I know someone who used these AD5258 parts from Analog Devices:

www.analog.com/en/digital-to-analog-converters/digital-potentiometers/AD5258/products/product.html

I seem to recall him running into some errata, but can't remember the details.