I tried to change the RDAC Register value of AD5274BRMZ-20 (20K-Max) through I2C. But the resistance between the A & W pins is always constant to 9.25K(Mid Value).
I have sent the following Values through I2C.
Device Address : 0X2C (I have tried 2F also)
Command bits : 0001 (C3,C2,C1,C0)
Attached the Image of the Waveforms. Could anyone let me know, where it went wrong.
Could you share the schematic of your design?
Here are the schematics. The I2c line pulled to high with 2.2K.
By default the update to wiper position is disabled. you need to send the following code to enable it:
Please refer to command 7 in table 12. Table 14 and 15 will give you detailed explanation. You need to enable C1 bit in the Control register to enable update of wiper position.