ISL22317 Intersil Corporation, ISL22317 Datasheet

ISL22317

Manufacturer Part Number

ISL22317

Description

Precision Single Digitally Controlled Potentiometer

Manufacturer

Intersil Corporation

Datasheet

1.ISL22317.pdf (15 pages)

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Low Noise, Low Power, I

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 I

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.

Pinout

REF_A

REF_B

SDA

SCL

(10 LD TDFN)

TOP VIEW

ISL22317

Data Sheet

™

Bus, 128 Taps

Precision Single Digitally Controlled Potentiometer (XDCP™)

VCC

GND

1-888-INTERSIL or 1-888-468-3774

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Features

• Precision Digitally Controlled Potentiometer

• Integrated Digitally Controlled Potentiometer

• Single 2.7V to 5.5V Supply

• High Reliability

• 3mmx3mm Thin DFN Package – 0.75mm Max Thickness,

• Pb-Free (RoHS Compliant)

Applications

• Setting Precise Current Values for DC Margining and

• Replaces Complex Compensation Circuitry That Stores

• Setting Precise Resistance Values for Test and

• Adjust Specific Resistances in Analog Circuits

• Precise Calibration and Fine Tune-Up

- 99% Typical Accuracy Of Resistance Over Operational

- Zero-Compensated Wiper Resistance

- 128-Tap Positions

- I

- Pin Selectable Slave Address

- 10kΩ, 50kΩ and 100kΩTotal Resistance

- Monotonic Over-Temperature

- Non-Volatile EEPROM Storage of Wiper Position

- 0 to VCC Terminal Voltage

- 50 Years Retention @ ≤ +55°C

- 15 Years Retention @ +125°C

- 1,000,000 Cycles Endurance

0.65mm Pitch

Backlight Control

Values in Look-up Tables Needed for Precise Resistor

Setting

Measurement Circuits

Intersil (and design) and XDCP are registered trademarks of Intersil Americas Inc.

Conditions

C Serial Interface

All other trademarks mentioned are the property of their respective owners.

May 26, 2009

ISL22317

FN6912.0

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