creo que ay un problema usando los pots digitales e estado mirando el data del ds1804 e pone esto
H - High-Terminal Potentiometer. This is the high terminal of the potentiometer. It is not required that
this terminal be connected to a potential greater than the L-terminal. Voltage applied to the H-terminal
cannot exceed the power-supply voltage, VCC, or go below ground.
L - Low-Terminal Potentiometer. This is the low terminal of the potentiometer. It is not required that this
terminal be connected to a potential less than the H-terminal. Voltage applied to the L-terminal cannot
exceed the power-supply voltage, VCC, or go below ground.
W - Wiper of the Potentiometer. This pin is the wiper of the potentiometer. Its position on the resistor
array is controlled by the three-terminal control port. Voltage applied to the wiper cannot exceed the
power-supply voltage, VCC, or go below ground.
no voy mucho con englis pero por lo que entiendo en los pines de la parte del potenciometro digital no se puede passar de los 5v ya que voltages maiores lo quemarian e estado aciendo medidas en los pots mecanicos que uso em la fuente e ay una variacion de voltage de 0v a 25v que es lo que me da mi fuente pues siendo assi e si no estoy equivocado si conectara el pot digital directamente al cableado del mecanico este se quemaria