The X9418 integrates two digitally controlled potentiometers (XDCPS) on a monolithic CMOS integrated microcircuit. The digital control potentiometer is realized by a series array of 63 resistance elements. Between each element are contacts connected to the wiper terminal by a switch.
Block diagram
The position of the wiper on the array is controlled by the user through a 2-wire bus interface. Each potentiometer is associated with a volatile wiper counter register (WCR) and four non-volatile data registers (DR0:DR3) that can be written and read directly by the user.
Detailed potentiometer block diagram
The contents of the WCR control the wiper position on the resistance array via a switch. Power up recalls the contents of DR0 to WCR. XDCP can be used as a three-terminal potentiometer or a two-end variable resistor for a variety of applications including control, parameter adjustment, and signal processing.
