X9279TB-2.7

` 256 Resistor Taps
` 2-Wire Serial Interface for write, read, and transfer operations of the potentiometer
` Wiper Resistance, 100 typical @ 5V
` 16 Nonvolatile Data Registers for Each Potentiometer
` Nonvolatile Storage of Multiple Wiper Positions
` Power On Recall. Loads Saved Wiper Position on Power Up.
` Standby Current < 5A Max
` V_CC : 2.7V to 5.5V Operation
` 50K , 100K versions of End to End Resistance
` Endurance: 100,000 Data Changes per Bit per Register
` 100 yr. Data Retention
` 14-Lead TSSOP, 16-Lead CSP (Chip Scale Package)
` Low Power CMOS

Temperature under bias..................................................................................65 to +135
Storage temperature.......................................................................................65 to +150
Voltage on SCL, SDA any address input with respect to V_SS ..................................1V to +7V
V = | (VHVL) |............................................................................................................... 5.5V
Lead temperature (soldering, 10 seconds)..................................................................... 300
IW  (10 seconds).............................................................................................................±6mA

The X9279 integrates a single digitally controlled potentiometer (XDCP) on a monolithic CMOS integrated circuit.

The   X9279  digital controlled potentiometer is implemented using 255 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. The  X9279  potentiometer has associated with it a volatile Wiper Counter Register (WCR) and a four nonvolatile Data Registers 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 though the switches. Powerup recalls the contents of the default data register (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.