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AD5263 I2C shutdown bit (SD) affects other channels.

Question asked by mybandjoe on Sep 29, 2012
Latest reply on Oct 18, 2012 by musach

Hi,

 

Is there an errata on the AD5263 part?

 

I have the AD5263 configured to use the I2C so I can use the (SD) shutdown bit

on individual pots.  There is a write sequence that causes pots to shut down

that are not being accessed.

 

1) Set all pots so SD bit equals 0. Not shutdown. Values set to 255. (Don't think the value matters.)

2) Write any value to pot 0 with the shutdown bit set 1.

3) Write any value to pot 3. Shutdown bit can be 1 or 0.

This will shutdown pot 2.  The only way to get pot 2 back is to write to it clearing the shutdown bit.

 

You can accomplish the same thing by doing a random access read of the channels.

Where you setup the read channel by doing a write with only the instruction byte.

You don't actually have to send a data byte.  Just writing the instruction byte in the

above sequence causes the same problem.

 

Thanks for your time,

Joe

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