X9428

Key Features

• Solid state potentiometer
• 2-wire serial interface
• Register oriented format
• Direct Read/Write/Transfer wiper position
• Store as many as four positions per potentiometer
• Power supplies
• V_CC = 2.7V to 5.5V
• V+ = 2.7V to 5.5V
• V- = -2.7V to -5.5V
• Low power CMOS
• Standby current < 1µA
• Ideal for battery operated applications
• High reliability
• Endurance-100,000 Data changes per bit per register
• Register data retention-100 years
• 4-bytes of nonvolatile memory
• 10kΩ resistor array
• Resolution: 64 taps each potentiometer
• 16 Ld SOIC, 14 Ld TSSOP packages
• Pb-free plus anneal available (RoHS compliant)

Description

The X9428 integrates a digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated microcircuit.

The digitally controlled potentiometer is implemented using 63 resistive elements in a series array. Between each element are tap points connected to the wiper terminal through switches. The position of the wiper on the array is controlled by the user through the 2-wire bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 4 nonvolatile Data Registers (DR0:DR3) that can be directly written to and read by the user. The contents of the WCR controls the position of the wiper on the resistor array through the switches. Power-up recalls the contents of DR0 to the WCR.

The XDCP can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.