AD5206/5204 SPI Digital Pot Problem

Forum 2005-2010 (read only) Software Interfacing
1

I'm working to implement an SPI digital potentiometer with my Arduino Duemilanove. I'm using the AD 5204.

I've been following the tutorial posted here, which is for the AD5206 (a 6 terminal version of the chip I'm using), without success. This model has been copied widely, so I'm sure I'm the problem.

Any thoughts on what the problem may be? How should I go about trying to diagnose this? I'm wondering if the serial LED on pin 13 is the problem. Pin 13 is the SPI CLK, but I'm not sure if the voltage drop is causing a problem.

Thanks in advance for your help. I'm still pretty new at all this, so any advice is welcome news to me.

2

Figure I solve my own problem after I post to the forum. The 5204 has two control inputs not found on the 5206: /PR and /SHDN. These need to be tied to +5V for the data to flow.

Lesson learned: RTF Datasheet.