ISL22317

Precision Single Digitally Controlled Potentiometer; Low Noise, Low Power, I2C Bus, 128 Taps

Product Status: Mass Production(*)

OVERVIEW

The digitally controlled potentiometer is implemented with a combination of resistor elements and CMOS switches. The position of the wiper is controlled by the user through the I2 C bus interface. The 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 control the position of the wiper. At power up, the device recalls the contents of the DCP's IVR to the WR.

The highly precise ISL22317 features a low end-to-end temperature coefficient of TC_Ref ±10ppm/°C and precise resistance selection. It maintains less than ±1% typical variance from the ideal resistance at each wiper position providing 99% accuracy of selected resistance value. This highly accurate DCP eliminates the need for complex algorithms to guarantee precision. The ISL22317 allows the user to dial in an accurate resistance and the EEPROM memory stores the set value for life, or until changed by the user.

An external 0.5% or better reference resistor must be attached to the ISL22317. The ISL22317 will mirror both the precise resistance and temperature coefficient of the external resistor.

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

  • Precision Digitally Controlled Potentiometer
  • 99% Typical Accuracy Of Resistance Over Operational Conditions
  • Zero-Compensated Wiper Resistance
  • Integrated Digitally Controlled Potentiometer
  • 128-Tap Positions
  • I2C Serial Interface
  • Pin Selectable Slave Address
  • 10kΩ, 50kΩ and 100kΩ Total Resistance
  • Monotonic Over-Temperature
  • Non-Volatile EEPROM Storage of Wiper Position
  • 0 to VCC Terminal Voltage
  • Single 2.7V to 5.5V Supply
  • High Reliability
  • 50 Years Retention @ ≤ +55°C
  • 15 Years Retention @ +125°C
  • 1,000,000 Cycles Endurance
  • 3mmx3mm Thin DFN Package – 0.75mm Max Thickness, 0.65mm Pitch
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL22317
Basic Information
生产状态
Mass Production(*)
器件/通道数量
1
抽头数量
128
内存类型
Nonvolatile
总线/输出接口
I2C
阻抗选项 (kΩ)
10, 50
供电电压Vcc (最小值) (V)
2.7
供电电压Vcc (最大值) (V)
5.5
供电电流Icc
500 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)
0
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)
50
中点比率温度系数
10
特性
1% tolerance, zero-compensated wiper resistance in rheostat mode, external resistor tempco tracking
资质级别
Standard
单电源范围 (V)
0 to 5.5
供电电压Vcc范围 (V)
2.7 to 5.5
CAN 采样
YES
温度范围
-40 to +125

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