CAT5122 Datasheet | Catalyst Semiconductor

CAT5120, CAT5121, CAT5122 16-Tap Mini Pot™ Digitally Programmable Potentiometers with 2-Wire Interface Features - - - - - - - DEscription CAT5120/5121/5122 linear-taper digitally programmable potentiometers perform the same function as a mechanical potentiometer or a variable resistor. These devices consist of a fixed resistor and a wiper contact with 16-tap points that are digitally controlled through a 2-wire up/down serial interface. The CAT5120 is configured as a potentiometer. The CAT5121 and CAT5122 are configured as variable resistors. See Pin Configurations for part functionality. Three resistance values are available: 10kΩ, 50kΩ and 100kΩ. These are available in space-saving 5-pin and 6-pin SC70 and SOT-23 packages. 0.3µA Ultra-low supply current Single-supply operation: 2.7V to 5.5V Glitchless switching between resistor taps Power-on reset to midscale 2-Wire up/down serial interface Resistance values: 10kΩ, 50kΩ and 100kΩ Available in SC70 and SOT-23 packages Applications - - - - - LCD screen adjustment Volume control Mechanical potentiometer replacement Gain adjustment Line impedance matching Functional Diagram .. VDD GND UP-DOWN COUNTER For Ordering Information details, see page 10. 16-POSITION DECODER U/D Pin Configuration s C70 s OT-23 VDD 6 H VDD s C70 s OT-23 5 H Pin Descriptions Name Description Power Supply Ground Up/Down Control Input. With CS low, a lowto-high transition increments or decrements the wiper position. Chip Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or decrement if U/D is low. Low Terminal of Resistor Wiper Terminal of Resistor High Terminal of Resistor Doc. No. 2121, Rev. C GND 2 5 W GND 2 4...