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CAT5123TBI-50-GT10 Datasheet(PDF) 5 Page - Catalyst Semiconductor |
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CAT5123TBI-50-GT10 Datasheet(HTML) 5 Page - Catalyst Semiconductor |
5 / 16 page CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125 5 Doc No. 220, Rev. E © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CS U/D W tCU tIL tIH tSETTLE tIC tCI tSETTLE Note: "W" is not a digital signal. It represents wiper transitions. FunCTIOnAl DesCrIPTIOn The CAT50/58/59/523/524/525 consist of a fixed resistor and a wiper contact with 32-tap points that are digitally controlled through a 2-wire up/down serial interface. Three end-to-end resistance values are available: 0kΩ, 50kΩ and 00kΩ. The CAT50/525 is designed to operate as a potentiometer. In this configuration, the low terminal of the resistor array is connected to ground (pin 2). The CAT58/523 performs as a variable resistor. In this device, the wiper terminal and high terminal of the resistor array are connected at pin 5.The CAT59/524 is a similar variable resistor, except the low terminal is connected to pin 5. DIGITAl InTerFACe OPerATIOn The MiniPots have two modes of operation when the serialinterfaceisactive:incrementanddecrementmode. The serial interface is only active when CS is low. Figure 2. serial Interface Timing Diagram, Decrement Mode Figure 1. serial Interface Timing Diagram, Increment Mode The CS and U/D inputs control the position of the wiper along the resistor array. When CS transitions from high to low, the part will go into increment mode if U/D input is high, and into decrement mode when U/D input is low. Once the mode is set, the device will remain in that mode until CS goes high again. A low-to-high transition at the U/D pin will increment or decrement the wiper position depending on the current mode (Figures and 2). When the CS input transitions to high (serial interface inactive), the value of the counter is stored and the wiper position is maintained. Note that when the wiper reaches the maximum (or minimum) tap position, the wiper will not wrap around to the minimum (or maximum) position. POWer-On reseT All parts in this family feature power-on reset (POR) circuitry that sets the wiper position to midscale at power- up. By default, the chip is in the increment mode. CS U/D W tCU tIL tIH tIC tSETTLE tCI tSETTLE Note: "W" is not a digital signal. It represents wiper transitions. |
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