Potentiometer controls up to 16 devices on one bus

19 October 2009

ON Semiconductor has announced two new Digitally Programmable Potentiometer (DPP) ICs
ON Semiconductor has announced two new Digitally Programmable Potentiometer (DPP) ICs

ON Semiconductor has announced two new Digitally Programmable Potentiometer (DPP) ICs.

These are said to be suitable for high accuracy and stability for variable resistance adjustment applications in a range of industrial and consumer products. The CAT5270 and CAT5271 are dual-channel digital potentiometers with 256 resistor taps for fine resolution adjustment and an I2C-compatible interface for maximum interoperability.

The new DPPs feature a volatile wiper register making them ideal for applications using a microcontroller (MCU) with on-chip memory for wiper recall, or for systems that do not require memory. They also provide a low-noise, reliable and space-saving alternative to mechanical potentiometers with the added benefit of immunity to dust / dirt contamination and vibration. The CAT5270 allows microprocessor control of up to 16 devices from a single bus, while the CAT5271 offers a single, fixed address. Both devices are available with end-to-end resistance options of 50 kilohms, (kΩ) and 100 kΩ and can be used as a potentiometer or as a 2-terminal, variable rheostat. The volatile wiper register for both devices is set to mid-scale on power-up.

The CAT5270 and CAT5271 are insensitive to mechanical vibrations, shock, oxidation, dust, dirt and other contamination and are a fraction of the size of mechanical potentiometers. They have a low temperature co-efficient of 100 parts per million per degrees Celsius (ppm/ºC) making them much more stable and reliable than mechanical potentiometers across a wide variety of environmental conditions.

The CAT5270 and CAT5271 digitally programmable potentiometers are supplied in 14-lead TSSOP and 10-lead MSOP packages, respectively.


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