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Intersil’s first low-voltage, precision, Digitally Controlled Potentiometer (DCP) reduces cost, programming and system calibration

   Intersil Corporation has introduced ISL22317, the first low-voltage DCP with less than 1 percent typical resistor tolerance. The ultra-low tolerance allows the ISL22317 to be used as a true variable resistor, enabling users to set standard and non-standard resistor values for open-loop applications. 

The ISL22317 is an excellent choice for designs that require specific current and resistor values such as test and measurement circuits, medical devices, backlight controls, or adjusting specific resistances in analog circuits.  The patent-pending architecture of the ISL22317 allows it to track an external resistor within 10ppm/°C, improving overall system accuracy for temperatures up to 125°C.  

The ISL22317 reduces programming time and development costs by letting users select accurate pre-determined resistor values, and use calculated resistor values in schematics. In addition, it allows one to use the known value of one system to calibrate other systems. The device employs an easy-to-use I2C interface to program accurate resistor settings >1 million times in the integrated EEPROM memory.

Technical Features and Benefits
The ISL22317 also features a zero-compensated wiper resistance in rheostat mode.  By negating wiper resistance, overall accuracy is improved, especially at the low tap positions where the ratio of wiper resistance to actual resistance is much higher.  This enables users to do schematic calculations based on an actual 1 percent value, instead of competitive solutions that have >±20 percent tolerance of the resistor string in addition to wiper resistance error.  

The product also features:

  • 128-Tap Positions
  • I2C Serial Interface
  • Pin Selectable Slave Address
  • 10k-ohm, 50k-ohm and 100k-ohm total resistance options
  • Monotonic over-temperature
  • Non-volatile EEPROM storage of wiper position
  • Single 2.7V to 5.5V supply
  • -40°C to 125°C operating temperature range
The ISL22317 is supplied in a 3mm x 3mm TDFN package – 0.75mm max thickness, 0.65mm pitch.

For more information, or details on the full range of Intersil products available from Anglia, please call +44 (0)1945 474747 or email info@anglia.com

Alternatively, click on this link to go to the main Intersil section where you can view other news articles and product data.

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This news article was originally published in November 2009.

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