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CAT5121 Datasheet(PDF) 1 Page - Catalyst Semiconductor |
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CAT5121 Datasheet(HTML) 1 Page - Catalyst Semiconductor |
1 / 12 page CAT5120, CAT5121, CAT5122 © Catalyst Semiconductor, Inc. 1 Doc. No. MD-2121 Rev. E Characteristics subject to change without notice 16-Tap MiniPot™ Digitally Programmable Potentiometers with 2-Wire Interface FEATURES 0.3µA Ultra-low standby 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 SC-70 and SOT-23 packages APPLICATIONS LCD screen adjustment Volume control Mechanical potentiometer replacement Gain adjustment Line impedance matching For Ordering Information details, see page 10. PIN CONFIGURATION 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 SC-70 and SOT-23 packages. FUNCTIONAL DIAGRAM PIN DESCRIPTIONS Name Description VDD Power Supply GND Ground U/D ¯ Up/Down ¯¯¯¯¯ Control Input. With CS ¯¯ low, a low-to-high transition increments or decrements the wiper position. CS ¯¯ 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. L Low Terminal of Resistor W Wiper Terminal of Resistor H High Terminal of Resistor U/D VDD GND H L W CS GND CS U/D H 2 CAT5122 GND CS U/D 16 15 34 H VDD VDD VDD 2 34 W 5 CAT5120 SC-70 SOT-23 SC-70 SOT-23 SC-70 SOT-23 GND CS U/D 16 H 2 L 5 CAT5121 34 |
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