DPP ICs improve on stability of mechanical types
ON Semiconductor
CAT5270
ON Semiconductor has released two digitally programmable potentiometer (DPP) ICs for accuracy and stability in variable-resistance adjustment applications in 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 ON Semiconductor 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 and 100kohm and can be used as potentiometers or as two-terminal variable rheostats.
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 coefficient of 100 parts per million per degrees Celsius (ppm/C), making them more stable and reliable than mechanical potentiometers.
The CAT5270 and CAT5271 digitally programmable potentiometers are supplied in 14-lead TSSOP and 10-lead MSOP packages respectively.
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