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CAT5128 Datasheet(PDF) 2 Page - ON Semiconductor |
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CAT5128 Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 7 page CAT5128 http://onsemi.com 2 Functional Diagrams Figure 1. General A B UP/DOWN Control Power On A B GND W W 31 30 29 28 2 1 0 TRANS− GATES 5−BIT UP/DOWN COUNTER GND A W B Figure 2. Detailed Figure 3. Electronic Potentiometer Implementation Recall DOWN VCC UP DOWN UP VCC FER Pin Description UP: Step-Up Control Input When DOWN input is high, a high-to-low transition on UP input will cause the wiper to move one increment toward the A terminal. DOWN: Step-Down Control Input A high-to-low transition on DOWN input will cause the wiper to move one increment towards the B terminal. A: High End Potentiometer Terminal A is the high end terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the B terminal. Voltage applied to the A terminal cannot exceed the supply voltage, VCC or go below ground, GND. W: Wiper Potentiometer Terminal W is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the control inputs, UP and DOWN. Voltage applied to the W terminal cannot exceed the supply voltage, VCC or go below ground, GND. B: Low End Potentiometer Terminal B is the low end terminal of the potentiometer. It is not required that this terminal be connected to a potential less than the A terminal. Voltage applied to the B terminal cannot exceed the supply voltage, VCC or go below ground, GND. B and A are electrically interchangeable. Device Operation The CAT5128 operates like a digitally controlled potentiometer with A and B equivalent to the high and low terminals and W equivalent to the mechanical potentiometer’s wiper. There are 32 available tap positions including the resistor end points, A and B. There are 31 resistor elements connected in series between the A and B terminals. The wiper terminal is connected to one of the 32 taps and controlled by two inputs, UP and DOWN. These inputs control a five-bit up/down counter whose output is decoded to select the wiper position. A high-to-low transition on DOWN input will decrement one step the wiper position (RWB will decrease with 1LSB and RWA will increase with 1LSB). If and only if DOWN input is high, a high-to-low transition on UP input will increment one step the wiper position (RWB will increase with 1LSB and RWA will decrease with 1LSB). The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. When the CAT5128 is powered-down, the wiper position is reset. When power is restored, the counter is set to the mid point, tap 15. |
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