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AD5220 goes to final position when I pull CLK low.

Thread Summary

The user is experiencing issues with the AD5220 digital potentiometer, where the resistance jumps to the final position when the CLK pin is pulled low. The final answer suggests that the CLK pin requires pulses with falling edges to increment the wiper position, and the CS pin should be low. The user is advised to check the timing requirements in the datasheet and consider using the AD5116, which does not require a clock, though it has 64 steps and is not in a DIL package. The user also mentions that a similar issue occurred with the X9C103S, and the problem persists even with a debouncing circuit and a square wave generator.
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Category: Hardware
Product Number: AD5220

AD5220 goes to final position as soon as I pull CLK low. On power on everything is fine, its resistance is at 50 %. I got debounce circuitry in place. As soon as I open CLK, voltage there goes from 5 to 0 V and in same instance the resistance goes to final position. I assumed the entire point of the CLK is that with a push button I can click through the resistors one by one? Data sheet says it falling edge. Once its at sable 0 V there is no edge? Apart from it just goes from 5kOhm to 0 in an instance. Does there have to be a clock or can I increment at will (this is what push button suggests)?

The IC is purchased from Farnell, I would like to hope I did not get a cheap copy.

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