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Digital potentiometer features on-chip EEPROM

Posted: 20 May 2009     Print Version  Bookmark and Share

Keywords:digital potentiometer  DAC  mechanical potentiometer  EEPROM memory 


ON Semiconductor has expanded its family of digitally programmable potentiometers with a new 256-tap, single-channel linear-taper device.

The CAT5140 digital potentiometer is a low-noise, reliable and space-saving alternative to DACs and mechanical potentiometers. It features an on-chip, 8-bit, non-volatile EEPROM memory, which allows designers to calibrate once and retain the wiper setting in memory on power-up. The new DPP also provides five additional non-volatile registers for general purpose data storage, as well as a volatile wiper register for applications requiring temporary storage.

The integrated memory options in the CAT5140 save board space and costs compared to DAC-based design approaches, which typically require external memory and additional interconnects.

Additionally, the ultra-low standby current (2 micro-amperes max) of the CAT5140, combined with integrated memory, make it ideal for mechanical potentiometer replacement in space-constrained, handheld applications. Since it is digitally programmable, the CAT5140 is insensitive to mechanical vibrations, shock and oxidation, making it much more stable and reliable than mechanical potentiometers across most environmental conditions.

The CAT5140 is a single-channel, linear-taper digital potentiometer with a 400kHz, I2C-compatible interface for LCD screen adjustment; automated calibration; contrast, brightness and volume control; gain adjustment and line impedance matching applications. EEPROM endurance for the CAT5140 is 2,000,000 data write stores, two times that of competitive devices. Data retention is 100 years, which is two times higher than competitive digital potentiometers.

The CAT5140 DPP comes in a Pb-free, RoHS-compliant 8-lead MSOP package and is priced at Rs.30.37 ($0.60 USD) per unit in 10,000 unit quantities. Samples are available now. Projected lead-time for production quantities is currently eight to 12 weeks ARO.

Want to learn more about potentiometers? Click here!

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