Temperature-Controlled, NV, I²C, Logarithmic Resistor

The DS1841 is a 7-bit, logarithmic, nonvolatile (NV) digital resistor that features an on-chip temperature sensor and associated analog-to-digital converter (ADC). The integrated temperature sensor indexes a 72-byte NV lookup table (LUT) encompassing a temperature range from -40°C to +100°C. The LUT output can drive the resistor directly or be added to an NV initial-value register (IVR) to drive the resistor. This flexible LUT-based architecture allows the DS1841 to provide a temperature-compensated resistor output with arbitrary slope. Programming is accomplished by an I²C-compatible interface, which can operate at speeds of up to 400kHz.

Applications

* Instrumentation and Industrial Controls * Linear and Nonlinear Compensation * Mechanical Potentiometer Replacement * Optical Transceivers

* 22kΩ to 3.7kΩ Adjustable Logarithmic Resistor with a 3.6kΩ Fixed Resistor

* 128 Wiper Tap Points

* On-Chip Temperature Sensor and ADC

* 72-Byte Lookup Table (LUT)

* I²C-Compatible Serial Interface

* Address Pins Allow Up to Four DS1841s to Share the Same I²C Bus

* Digital Supply of 2.7V to 5.5V

* -40°C to +100°C Operating Range

* 3mm x 3mm, 10-Pin TDFN Package