256-Tap Digital Potentiometer with I2C Interface and Integrated EEPROM
ON Semiconductor has added a new 256-tap, single-channel linear-taper device to its extensive family of Digitally Programmable Potentiometers (DPP). 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 400 kilohertz (kHz), 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.
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