X9428

• 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
-VCC = 2.7V to 5.5V
-V+ = 2.7V to 5.5V
-V = -2.7V to -5.5V
• Low power CMOS
-Standby current < 1A
-Ideal for Battery Operated Applications
• High reliability
-Endurance100,000 Data Changes per Bit per Register
-Register Data Retention100 years
• 4-bytes of nonvolatile memory
• 10k resistor array
• Resolution: 64 taps each potentiometer
• SOIC and TSSOP packages

Temperature under bias ......... -65°C to +135°C
Storage temperature ............. -65°C to +150°C
Voltage on SDA, SCL or any address
input with respect to V_SS.................... -1V to +7V
Voltage on V+ (referenced to V_SS)..................10V
Voltage on V- (referenced to V_SS)..................-10V
(V+) - (V-) .......................................................12V
Any V_H/R_H .........................................................V+
Any V_L/R_L.....................................................VLead
temperature (soldering, 10 seconds)........ 300°C
I_W (10 seconds).........................................±12mA

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

The X9428 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 X9428 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.