Digital potentiometer / rheostat has incremental encoder and SPI
Six models of LSI / CSI three-terminal ICs have been added to the Omni Pro Electronics range. The LS7190, LS7191, LS7192, LS7193, LS7194 and LS7195 are versions of a three-terminal digital potentiometer which replace mechanical potentiometers.
The design offers a direct interface with incremental encoders, adjustable bounce for mechanical encoder / switch and the ICs are configurable to operate with non-quadrature clock. A serial peripheral interface (SPI) is included for host microcontrollers.
The clocks drive an internal 6-bit up/down counter with a count N ranging between 0 and 63 to correspond to 64 wiper-tap positions of a resistor chain consisting of 64 equal resistors. The LS7190 and LS7193 interfaces with quadrature clocks from incremental encoders.
The LS7191 /LS7192 and LS7194 / LS7195 interfaces with non-quadrature up (A) and down (B) clocks. A and B inputs for LS7190 / LS7191 and LS7193 /LS7194 are debounced allowing these signals to be sourced from mechanical encoders or push-button switches. A and B inputs for the LS7192 and LS7195 are not debounced so that fast clocks from electronic clock sources can be used. They supply 3.0 to 5.0V and are available in 20, 50 and 100K versions.
The LS7190, LS7191, LS7192, LS7193, LS7194 and LS7195 are qualified for the automotive temperature range and available in SOIC-8, SOIC-14, and TSSOP-14 packages.
The LSI / CSI digital potentiometers are used as replacements for mechanical potentiometers and for potentiometer adjustments. They can also be used for remote adjustments of instrumentation for gain, offset, time constant, line impedance matching and audio equipment volume control.
Omni Pro Electronics is a franchised distributor, supplying LED drivers, timers as well as the full line of LSI / CSI digital potentiometers.
