X9271

Single Digitally-Controlled (XDCP™) Potentiometer

OVERVIEW

The X9271 integrates a single, digitally controlled potentiometer (XDCP™) on a monolithic CMOS integrated circuit.

The digitally controlled potentiometer is implemented by 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 SPI bus interface. The potentiometer has associated with it a volatile Wiper Counter Register (WCR) and four nonvolatile data registers that can be directly written to and read by the user. The contents of the WCR control the position of the wiper on the resistor array though the switches. Power-up 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.

KEY FEATURES

  • 256 Resistor Taps
  • SPI Serial Interface for Write, Read, and Transfer Operations of Potentiometer
  • Wiper Resistance, 100Ω typical at VCC = 5V
  • 16 Nonvolatile Data Registers
  • Nonvolatile Storage of Multiple Wiper Positions
  • Power-on Recall; Loads Saved Wiper Position on Power-up
  • Standby Current <3µA Max
  • VCC = 2.7V to 5.5V Operation
  • 50kΩ End-to-End Resistance
  • 100-yr Data Retention
  • Endurance: 100,000 Data Changes per Bit per Register
  • 14-Lead TSSOP
  • Low-power CMOS
  • Pb-Free Plus Anneal Available (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
X9271
Basic Information
Production Status
Mass Production
# of Devices/ Channels
1
# of Taps
256
Memory Type
Nonvolatile
Bus/Output Interface
SPI
Resistance Options (kΩ)
50
Supply Voltage Vcc (Min) (V)
2.7
Supply Voltage Vcc (Max) (V)
5.5
Supply Current Icc
5 µA
Resistance Taper
Linear
VL Min. Terminal Voltage
0 V
VL Max. Terminal Voltage
5.5 V
Wiper Current (mA)
3
Wiper Resistance (Ω)
150
Dual Supply Range (V)
N/A
Max Operating Temperature
85 °C
End-to-End Temperature Coefficient (ppm/øC)
300
Middlepoint Ratiometric Tempco
20
Qualification Level
Standard
Single Supply Range (V)
0 to 5.5
Supply Voltage Vcc Range (V)
2.7 to 5.5
Can Sample
YES
Temperature Range
-40 to +85

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