Daisy Chaining AD532x parts

Document created by analog-archivist Employee on Feb 23, 2016
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How do I daisy chain multiple AD5325 devices together?

 

To daisy chain multiple AD523X devices, simply connect SDO to SDI and run a
common SCLK and /CS to all devices. To program many AD523X devices in a "daisy
chain" configuration.  Pull the /CS lines low on all chips. Send the data into
the CLK and SDI pins of the first AD523X in the chain. The data format should
be data for the last potentiometer in the chain sent first. Once data for all
converters in the chain is sent, a positive edge on /CS will load data into all
potentiometers simultaneously.

You must always write the same word length to the chain of devices. For example
when two AD5232s are daisy chained together, you must always write 32 bits, for
4 devices, you must write 64 bits. If you only want to update the contents of a
single device, simply write a NOP to the device locations you do not wish to
update.

Also ensure that the recommended 2k pullup resistor is used on SDO!

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