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CAT5128TBI-10 Datasheet(PDF) 1 Page - ON Semiconductor |
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CAT5128TBI-10 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 8 page CAT5128 © 2008 SCILLC. All rights reserved. 1 Doc. No. MD-2128 Rev. B Characteristics subject to change without notice 32-Tap Digital Up/Down Control Potentiometer FEATURES 32-position linear taper potentiometer Low power CMOS technology Single supply operation: 2.5V – 5.5V Discrete step-up/step-down digital control Resistance values: 10kΩ, 50kΩ and 100kΩ Available in SOT-23 8-lead Pb-free package APPLICATIONS Automated product calibration Remote control adjustments Offset, gain and zero control Tamper-proof calibrations Contrast, brightness and volume controls Motor controls and feedback systems Programmable analog functions For Ordering Information details, see page 7. DESCRIPTION The CAT5128 is a single digitally programmable potentiometer (DPP™) designed as an electronic replacement for mechanical potentiometers and trim pots. Ideal for automated adjustments on high volume production lines, they are also well suited for applications where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment. The CAT5128 contains a 32-tap series resistor array connected between two terminals A and B. An up/down counter and decoder that are controlled by two input pins, determines which tap is connected to the wiper, W. Wiper-control of the CAT5128 is accomplished with two input control pins, UP ¯¯ and DOWN ¯¯¯¯¯¯. A high-to-low transition on the UP ¯¯ input increments the wiper position and a high-to-low transition on the DOWN ¯¯¯¯¯¯ input decrements the wiper position. The tap position is not stored in memory. The wiper is always set to the mid point, tap 15 at power up. The digitally programmable potentiometer can be used as a three-terminal resistive divider or as a two-terminal variable resistor. DPPs bring variability and program- mability to a wide variety of applications including control, parameter adjustments, and signal processing. FUNCTIONAL DIAGRAM A B UP/DOWN Control Power On Recall VCC UP DOWN A B GND W W UP DOWN Electronic Potentiometer Implementation Detailed General ONE OF THIRTY TWO DECODER 31 30 29 28 2 1 0 TRANSFER GATES RESISTOR ARRAY CONTROL CIRCUITRY 5-BIT UP/DOWN COUNTER VCC GND A W B |
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