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AD5111 Writing issue

Question asked by meir.mardechayev@phnx.co.il on May 28, 2015
Latest reply on Jun 2, 2015 by DRice

Hello,

 

One of my customers is using the AD5111 digital potenziometer.

 

He has an issue with writing to his egisters

 

Their tining is according to the figure 3 in the data sheet

The CS is tied to "low" by pull down. During this cycle the CLK is in HIGH

 

The writing cycle is failed whther they start the U/D# pin from "HIGH" as follows: HIGH-LOW-HIGH-LOW - then the EEPROM programm is not succeeds.

 

Using the following U/D# cycle the EEPROM programm is performed successfully: LOW-HIGH-LOW .

 

I can't see any limitations for it in data sheet.

 

Do you have any idea why during the HIGH-LOW-HIGH-LOW cycle the writing to the eeprom is failed?

 

Thanks

Meir

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