ISL23318

Single, 128-taps Low Voltage Digitally Controlled Potentiometer (XDCP™)

OVERVIEW

The ISL23318 is a volatile, low voltage, low noise, low power, I2 C Bus™, 128 Taps, single digitally controlled potentiometer (DCP), which integrates DCP core, wiper switches and control logic on a monolithic CMOS integrated circuit.

The digitally controlled potentiometer is 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. The potentiometer has an associated volatile Wiper Register (WR) that can be directly written to and read by the user. The contents of the WR controls the position of the wiper. When powered on, the ISL23318s wiper will always commence at mid-scale (64 tap position).

The low voltage, low power consumption, and small package of the ISL23318 make it an ideal choice for use in battery operated equipment. In addition, the ISL23318 has a VLOGIC pin allowing down to 1.2V bus operation, independent from the VCC value. This allows for low logic levels to be connected directly to the ISL23318 without passing through a voltage level shifter.

The DCP 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

  • 128 resistor taps
  • I2C serial interface
  • No additional level translator for low bus supply
  • Two address pins allow up to four devices per bus
  • Power supply
  • VCC = 1.7V to 5.5V analog power supply
  • VLOGIC = 1.2V to 5.5V I2C bus/logic power supply
  • Wiper resistance: 70Ω typical @ VCC = 3.3V
  • Shutdown Mode - forces the DCP into an end-to-end open circuit and RW is shorted to RL internally
  • Power-on preset to mid-scale (64 tap position)
  • Shutdown and standby current <2.8µA max
  • DCP terminal voltage from 0V to VCC
  • 10kΩ, 50kΩ or 100kΩ total resistance
  • Extended industrial temperature range: -40°C to +125°C
  • 10 Ld MSOP or 10 Ld UTQFN packages
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL23318
Basic Information
Production Status
Mass Production(*)
# of Devices/ Channels
1
# of Taps
128
Memory Type
Volatile
Bus/Output Interface
I2C
Resistance Options (kΩ)
10, 50, 100
Supply Voltage Vcc (Min) (V)
1.7
Supply Voltage Vcc (Max) (V)
5.5
Supply Current Icc
18 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)
175, 85, 70
Middlepoint Ratiometric Tempco
8, 4, 2.3
Features
VLOGIC 1.2V to 5.5V
Qualification Level
Standard
Single Supply Range (V)
0 to 5.5
Supply Voltage Vcc Range (V)
1.7 to 5.5
Can Sample
YES
Temperature Range
-40 to +125

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