ISL23325

Dual, 256-Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)

Product Status: Mass Production

OVERVIEW

The ISL23325 is a volatile, low voltage, low noise, low power, 256-Tap, dual digitally controlled potentiometer (DCP) with an I2 C Bus™ interface. It integrates two DCP cores, wiper switches and control logic on a monolithic CMOS integrated circuit.

Each 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. Each potentiometer has an associated volatile Wiper Register (WRi, i = 0, 1) that can be directly written to and read by the user. The contents of the WRi controls the position of the wiper. When powered on, the wiper of each DCP will always commence at mid-scale (128 tap position).

The low voltage, low power consumption, and small package of the ISL23325 make it an ideal choice for use in battery operated equipment. In addition, the ISL23325 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 ISL23325 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

  • Two potentiometers per package
  • 256 resistor taps
  • 10kΩ 50kΩ or 100kΩ total resistance
  • I2C serial interface
  • No additional level translator for low bus supply
  • Three address pins allow up to eight devices per bus
  • Maximum supply current without serial bus activity (standby)
  • 3µA @ VCC and VLOGIC = 5V
  • 1.7µA @ VCC and VLOGIC = 1.7V
  • Shutdown Mode
  • Forces the DCP into an end-to-end open circuit and RWi is connected to RLi internally
  • Reduces power consumption by disconnecting the DCP resistor from the circuit
  • 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
  • Power-on preset to mid-scale (128 tap position)
  • Extended industrial temperature range: -40°C to +125°C
  • 14 Ld TSSOP or 16 Ld µTQFN packages
  • Pb-free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL23325
Basic Information
生产状态
Mass Production
器件/通道数量
2
抽头数量
256
内存类型
Volatile
总线/输出接口
I2C
阻抗选项 (kΩ)
10, 100
供电电压Vcc (最小值) (V)
1.7
供电电压Vcc (最大值) (V)
5.5
供电电流Icc
3 µA
阻抗变化特性
Linear
VL最小终端电压
0 V
VL最大终端电压
5.5 V
Wiper电流 (mA)
3
Wiper电阻 (Ω)
70
双电源范围 (V)
N/A
最高工作温度
125 °C
端到端温度系数 (ppm/øC)
45, 65, 125
中点比率温度系数
8, 4, 2.3
特性
VLOGIC 1.2V to 5.5V; multiple device per bus
资质级别
Standard
单电源范围 (V)
0 to 5.5
供电电压Vcc范围 (V)
1.7 to 5.5
CAN 采样
YES
温度范围
-40 to +125

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