ISL22326

Dual Digitally Controlled Potentiometer; Low Noise, Low Power, I2 C Bus, 128 Taps

Product Status: Mass Production

OVERVIEW

The ISL22326 integrates two digitally controlled potentiometers (XDCP) and non-volatile memory on a monolithic CMOS integrated circuit.

The digitally controlled potentiometers are implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the I2 C bus interface. Each potentiometer has an associated volatile Wiper Register (WR) and a non-volatile Initial Value Register (IVR) that can be directly written to and read by the user. The contents of the WR controls the position of the wiper. At power-up the device recalls the contents of the two DCP's IVR to the corresponding WRs.

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

KEY FEATURES

  • Two potentiometers in one package
  • 128 resistor taps
  • I2C serial interface
  • Three address pins, up to eight devices/bus
  • Non-volatile storage of wiper position
  • Wiper resistance: 70Ω typical @ VCC = 3.3V
  • Shutdown mode
  • Shutdown current 5µA max
  • Power supply: 2.7V to 5.5V
  • 50kΩ or 10kΩ total resistance
  • High reliability
  • Endurance: 1,000,000 data changes per bit per register
  • Register data retention: 50 years @ T ≤ +55°C
  • 14 Ld TSSOP or 16 Ld QFN package
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL22326
Basic Information
Production Status
Mass Production
# of Devices/ Channels
2
# of Taps
128
Memory Type
Nonvolatile
Bus/Output Interface
I2C
Resistance Options (kΩ)
10
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)
70
Dual Supply Range (V)
N/A
Max Operating Temperature
125 °C
End-to-End Temperature Coefficient (ppm/øC)
50
Middlepoint Ratiometric Tempco
4
Features
3 terminal DCP with 6 bytes general purpose EEPROM
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 +125

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