For digital potentiometers, what is the state during power up?
Most of our digital potentiometers contain P.O.R. (power on preset) circuitry which presets the wiper-to-terminal resistance to the middle value of the terminal-to-terminal resistance.
If the digital potentiometer is volatile, this value remains in the register.
For example, If RAB = 10 kΩ, then at power-up RWB = RWA = 5 kΩ.
If the digital potentiometer is non volatile, this value is refreshed with the data stored in the memory after this has been read.
For the digital potentiometers that do not have this feature (POR), the wiper-to-terminal resistance can be anything at power-up.
Please check the datasheets for more details.
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